CN108645707A - Soil pressure calculation device and method under a kind of simulation steady seepage and oscillatory load - Google Patents
Soil pressure calculation device and method under a kind of simulation steady seepage and oscillatory load Download PDFInfo
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- CN108645707A CN108645707A CN201810428974.8A CN201810428974A CN108645707A CN 108645707 A CN108645707 A CN 108645707A CN 201810428974 A CN201810428974 A CN 201810428974A CN 108645707 A CN108645707 A CN 108645707A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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Abstract
Soil pressure calculation device and method under a kind of simulation steady seepage and oscillatory load, described device structure includes model casing（1）, the first screw rod（2）, the second screw rod（9）, the first steel plate（21）, the second steel plate（23）, support（4）, soil pressure cell, barricade（22）, reaction frame system（7）, T steel frame（17）, claw type support（10）, abutment bracket（12）, shaft（11）, bearing（8）, motor（24）, frequency converter（13）, dynamic static strain testing instrument and balancer（20）.Normal sand, which is set, in the model casing fills room（5）, seepage water reservoir chamber（3）, barricade recreation room（6）, power transformation electric power supply control system（35）, reaction frame system（7）, barricade dynamical system, barricade and soil pressure measure the subsystems such as acquisition system, sealing waterproof.Apparatus of the present invention are the powerfuls for disclosing soil pressure with Change and Development rule under steady seepage and oscillatory load and verification earth pressure theory.
Description
Technical field
The present invention relates to soil pressure calculation device and methods under a kind of simulation steady seepage and oscillatory load, belong to building and soil
Wood engineering experimental test technical field.
Background technology
With the continuous propulsion of Chinese Urbanization construction process, large deep foundation pit engineering is commonplace, and complexity is set
Meter and difficulty of construction will also become more and more challenging.The notable new feature of base pit engineering has " deep, big, close, difficult ",
Research also relates broadly to the mechanics fields such as geotechnical engineering, Structural Engineering and seepage flow and vibration, and seepage flow and traffic loading are to base
The influence of hole engineering increasingly attracts attention.
Currently, foundation pit closes in all multiple-projects of existing buildings or structures, the influence of seepage flow and traffic loading problem is more next
More cause under the background that domestic and international expert and scholar discuss warmly, for soil pressure research work under seepage action of ground water and action of traffic loading
Work, which rarely has, to be related to, and now from the point of view of engineering reality, carries out steady seepage and the lower Earth Pressure Models examination of oscillatory load effect
It tests research significance and value is far-reaching, and similar engineering can be put into practice and provide reference with theoretical.
Model test is to disclose soil pressure with Change and Development rule under steady seepage and oscillatory load and verification soil pressure reason
The powerful of opinion.To solve the above problems, soil pressure calculation device under a kind of simulation steady seepage of development and oscillatory load, is
Similar engineering is put into practice and theoretical offer advantageous information is very necessary.
Invention content
The object of the present invention is to bear the construction of soil pressure for civil engineering, provide a kind of simulation steady seepage with
Soil pressure calculation device and method under oscillatory load meet soil pressure size under seepage action of ground water and action of traffic loading and divide
The research of cloth rule and plane of fracture form needs.
The technical solution that the present invention realizes is as follows, soil pressure calculation device under a kind of simulation steady seepage and oscillatory load,
Including model casing, tempered glass, rectangular steel pipe, soil pressure cell, barricade, T steel frame, claw type support, abutment bracket, shaft, axis
It holds, motor, frequency converter, move static strain testing instrument and balancer；The model casing includes that normal sand fills room, seepage water savings
Room and barricade recreation room, power transformation electric power supply control system, reaction frame system, barricade dynamical system, barricade and soil pressure measure acquisition
System and sealing waterproof subsystem；Further include moveable first steel plate and the first screw rod, the second steel plate and the second screw rod.
The appearance profile of the model casing is rectangle box-shaped；The main body frame of model casing is welded by steel, both sides
Inlay tempered glass；It is respectively arranged with seepage water reservoir chamber from left to right inside the model casing main body frame, normal sand fills
Room and barricade recreation room；Seepage water reservoir chamber and normal sand are kept apart between filling room by the first steel plate, and the first steel plate is supporting
With can make horizontal direction movement under the first screw acting；Normal sand, which fills room, is isolated with barricade recreation room by the second steel plate and barricade
It opens, under the action of claw type support and the second screw rod, barricade can make horizontal direction shifting in company with the second steel plate for the second steel plate and barricade
Dynamic or rotation；Barricade and soil pressure measure acquisition system setting and fill room in normal sand；Power transformation electric power supply control system is mounted on anti-
On wall on the outside of power frame system.
The seepage water reservoir chamber is that the place of steady seepage condition is saved, provided to seepage water；The seepage water
First steel plate of reservoir chamber one end is fitted closely with tempered glass both sides and model casing bottom；Middle part connects on first steel plate
It is connected to the first screw rod, the first screw rod is shaken, the first steel plate can be made to move forward and backward in the horizontal direction, and then adjusts seepage water savings
The size of room.
The normal sand room of filling is the place for carrying out every soil pressure calculation, carry out inside it the filling of normal sand,
The placement of the mark of color sand, embedded and different distance the vibrating motor of pressure-measuring pipe；Room and barricade activity are filled in normal sand
The second steel plate is additionally provided among room, its size can be adjusted by controlling the first steel plate of seepage water reservoir chamber and the second steel plate distance；Institute
It is the basic platform for building pressure cell barricade and soil pressure measurement acquisition system to state normal sand and fill the second steel plate of room, is equipped with examination
The barricade for testing prefabricated soil pressure cell and miniature osmometer is respectively mounted on the second steel plate, needs the side with mutual disassembly according to experiment
Method realizes that the priority of barricade is replaced.
The barricade recreation room is the place that barricade realizes 3 kinds of active movement modes, i.e., around RB patterns of lower rotation, flat
Dynamic T patterns and rotate RT patterns around top；
The barricade dynamical system is located at barricade recreation room, including the support of the second screw rod, claw type, shaft, abutment bracket, motor and
Frequency converter；One end of two rod pieces up and down that claw type supports and barricade and soil pressure are measured acquisition system and be connected to by hinge
Together；Frequency converter is mounted on motor, and frequency converter is connected with resistive element in the power transformation power supply box in power transformation electric power supply control system,
Frequency converter is controlled by the electronic component of control handle, and then controls motor and rotates speed, the final barricade that controls moves speed, becomes
Frequency device and motor are fixed by screws in together on the steel of model casing external frame, then with the T steel in reaction frame system
Frame is connected；Abutment bracket limits the vertical displacement of the second screw rod, and providing support for the system keeps stablizing.
The power transformation electric power supply control system includes power transformation power supply box, the extraneous input needed for the power transformation electric power supply control system
Voltage is 220V, and barricade dynamical system is connected to by the outlet line of the power transformation power supply box other end after input voltage decompression；Institute
State power transformation power supply box be equipped with can automatic control device, including power switch, barricade forward-reverse switch and barricade move speed tune
Save knob；Power transformation electric power supply control system can realize 3 kinds of active movement modes, i.e. RB patterns, T patterns and RT patterns.
The reaction frame system is located at the right end mounted on entire model casing, and reaction frame system includes T steel frame, T shapes
Steelframe one end be mounted on the right metope on, one end withstand with and its agent structure be welded by steel；T steel frame 17 will
The power that barricade dynamical system passes over dispenses, and the effect that can be played fixed motor, safeguard stability with safety；Power transformation supplies
The outlet line of power transformation power supply box is also to be connect with motor along reaction frame system outer wall in electric control system.
Reaction frame system is adjacent with barricade recreation room next door；It is equipped among barricade recreation room and reaction frame system one piece thin
Steel plate can fill inside the normal sand simulation foundation pit of 25cm high in barricade recreation room, row's circular hole is also drilled on sheet metal, can
Play the role of increasing water level saturation and realizes steady seepage.
It includes soil pressure cell barricade, miniature osmometer barricade, standard that the barricade and soil pressure, which measure acquisition system mainly,
Sand fills indoor fixation steel plate, dynamic static strain testing instrument；Use size height × width x thickness of barricade made of plank for
1350mm × 800mm × 20mm, surface are drilled with 6 available bolts and fill the circular hole that indoor fixation steel plate is connect with normal sand,
It arranges soil pressure cell, miniature osmometer, arranges 3 row, 21 soil pressure cells altogether on movable barricade.
The subsystem includes balancer, sealing waterproofing membrane and seepage flow water pipe and headlamp；Balancer is for adjusting
The height for saving model casing keeps its holding horizontal and stablizes, shares 4, pad respectively on the pedestal of model casing.
A kind of soil pressure calculation method under simulation steady seepage and oscillatory load, which is characterized in that the method includes with
Lower step：
（1）The calibration of soil pressure cell and seepage gauge, test use soil pressure cell and miniature osmometer before manufacture by manufacturer
Calibration was carried out, carries out oil pressure and hydraulic pressure calibration respectively；Testing ground is carried out to existing soil pressure cell and osmometer respectively again
Secondary calibration；
（2）The soil pressure that standard sand under the conditions of anhydrous no-load acts on 3 kinds of barricade active movement modes on retaining wall is measured,
Basis is provided to measure soil pressure calculation under steady seepage and oscillatory load；
（3）Finite width sand active earth pressure under seepage effect is carried out to test：
1）It tests respectively under acting by external hydrostatic pressure and steady seepage acts on active water soil pressure under lower finite width 3 kinds of patterns of sand
Power total value and pore water pressure force value；
2）Cleaning arranges inside model casing, adjusts seepage water reservoir chamber steel plate to specified position and is replaced with miniature osmometer barricade simultaneously
Deformeter is connected, parameter is inputted in collection analysis software；
3）Start motor, make it start to generate displacement model movement, record the time-history curves and lateral diaphragm wall displacement value of each osmometer,
The destructive process and end-state of the soil body are observed, barricade movement is stopped, collapse state is maintained 30 minutes and continues to record, output figure
Shape；
（4）Carry out the lower finite width sand active earth pressure experiment of oscillatory load effect：
1）Cleaning arranges inside model casing, and soil pressure cell barricade is installed, and adjusts seepage water reservoir chamber steel plate；
2）Connect the channel on deformeter, input parameter to collection analysis software；
3）Waterproof sealing measure is carried out, experiment normal sand is sticked in wall surface；Soil pressure cell sensor is returned to zero, is used
" artificial knockout " method is layered laying standard sand using color sand, paves its surface, and the soil body is stood；
4）It first measures the initial soil pressure force value of a period of time and records, then place vibrating device to short distance position；
5) Vibration on Start-up motor after stationary vibration for a period of time, starts 3 kinds of displacement model movements, observes the destructive process of the soil body
And end-state, stop barricade movement, after maintaining collapse state vibration a period of time, output data.
The beneficial effects of the present invention are apparatus of the present invention include 5 system of Room 3, i.e., normal sand fills room, seepage water savings
Room, barricade recreation room, power transformation electric power supply control system, reaction frame system, barricade dynamical system, barricade and soil pressure measure acquisition system
The subsystems such as system, sealing waterproof；It is to disclose soil pressure with Change and Development rule under steady seepage and oscillatory load and verification soil
The powerful of pressure theory.The research that the device meets the soil pressure distribution regular under steady seepage and oscillatory load needs
It wants, the raising of development and engineering technology level to earth pressure theory is of great significance.
The present invention is suitable for soil pressure calculation under simulated groundwater seepage flow, and it is native under action of traffic loading to be also applied for simulation
Pressure testing.
Description of the drawings
Fig. 1 is the front view of apparatus of the present invention；
Fig. 2 is the vertical view of apparatus of the present invention；
Fig. 3 is the elevation of active catch board wall telecontrol equipment；
Fig. 4 is flapper RB（Around lower rotation）Wall movement mode figure；
Fig. 5 is flapper RT（It is rotated around top）Wall movement mode figure；
Fig. 6 is flapper T（Translation）Wall movement mode figure；
Fig. 7 is barricade size and soil pressure cell distribution map；
Fig. 8 is steady seepage test model figure；
Fig. 9 is oscillatory load test model figure；
Figure 10 is RB patterns active earth pressure with buried depth distribution map；
Figure 11 is RB patterns active water geostatic shield figure under steady seepage；
Figure 12 is soil pressure cell vibration timeamplitude map.
In figure：Frame based on 1,2 be the first screw rod, and 3 be seepage water storeroom, and 4 be support, and 5 be normal sand storeroom,
6 be barricade recreation room, and 7 be reaction frame system, and 8 be bearing, and 9 be the second screw rod, and 10 support for claw type, and 11 be shaft, and 12 be branch
Block bracket, 13 be frequency converter, and 14 be circular hole, and 15 be system board, and 16 be power switch, and 17 be T-steel frame, and 18 be electric wire, 19
For steel sheet, 20 balancers, 21 be the first steel plate, and 22 be barricade, and 23 be the second steel plate, and 24 be motor, and 25 open for movement speed
It closes, 26 switch for forward-reverse, and 27 be soil pressure cell, and 28 be tap water, and 29 be the barricade for not doing antiseepage water process, and 30 be to have done
The barricade of water-proofing treatment, 31 movable barricades, 32 be remote vibrating motor, and 33 shake apart from vibrating motor, 34 for short distance to be middle
Dynamic motor, 35 be power transformation power supply box, and 36 be seepage flow aquaporin.
Specific implementation mode
The specific implementation mode of the present invention is as shown in the figure.
Soil pressure calculation device under a kind of simulation steady seepage of the present embodiment and oscillatory load, including model casing 1, tempering glass
Glass, steel plate 21, box-shaped steel, the first screw rod 2, the second screw rod 9, the first steel plate 21, the second steel plate 23, support 4, soil pressure cell
27, barricade 22, reaction frame system 7, power transformation power supply box 35, T steel frame 17, claw type support 10, abutment bracket 12, shaft 11, axis
Hold 8, motor 24, frequency converter 13, dynamic static strain testing instrument, balancer 20 etc..
Model casing in the present embodiment can be divided into 8 big core contents, and total is summarised as " three Room, five system ", wherein three Room refer to
Be that normal sand fills room 5, seepage water reservoir chamber 3, barricade recreation room 6, five systems refer to power transformation electric power supply control system 35, anti-
Power frame system 7, barricade dynamical system, barricade and soil pressure measure the subsystems such as acquisition system, sealing waterproof.
Model casing is as depicted in figs. 1 and 2, and the appearance profile of model casing is rectangle box-shaped, and appearance and size length × wide ×
A height of 2.5m × 1.0m × 1.5m.The main body frame 1 of model casing is welded by the thick rectangular steel pipe of 10cm wide, 1cm, both sides edge
Embedding 20mm thickness tempered glass.
Seepage water reservoir chamber 3 in the present embodiment is that the main field of steady seepage condition is saved, provided to seepage water
Seepage water reservoir chamber 3 is filled room 5 with normal sand and separated by institute, thick first steel plate 21 of one piece of 8mm, and with tempered glass both sides
Portion and model casing bottom fit closely.Horizontal direction is equipped with the first screw rod 2 perpendicular to steel plate in the middle part of first steel plate, rotates
This first screw rod, you can make the side-to-side movement in the horizontal direction of the first steel plate and then adjust the size of seepage water reservoir chamber.
It is the main place for carrying out every soil pressure calculation that normal sand in the present embodiment, which fills room 5, can inside it into
The filling of row normal sand, the mark of color sand, pressure-measuring pipe it is embedded；And remote vibrating motor 32, it is middle apart from vibrating motor 33,
The placement of short distance vibrating motor 34, as shown in Figure 9.It is filled in normal sand and is additionally provided with one piece among room 5 and barricade recreation room 6
Second steel plate 23 of 15mm thickness, control the first steel plate of seepage water reservoir chamber can adjust its size with this second steel plate distance.Mark
The second steel plate 23 that quasi- sand fills room is the basic platform for building pressure cell barricade and soil pressure measurement acquisition system；It is equipped with
The barricade for testing prefabricated soil pressure cell and miniature osmometer reclines and is mounted on the second steel plate；It is needed according to experiment and artificial
The method of dismounting can realize the replacement of barricade.
Barrier wall structure in the present embodiment barricade recreation room 6 by bearing 8, the second screw rod 9, claw type as shown in figure 3, supported
10, shaft 11, abutment bracket 12, barricade 22 and the second steel plate 23 are constituted.Barricade 22 reclines and on the second steel plate 23；Pawl
The pawl foot of shape support 10 is fixed on the upper and lower ends of the second steel plate 23；Claw type supports the screw hole at 10 centers to be horizontally installed with the
Two screw rods 9；Abutment bracket 12 is vertically mounted on model casing bottom plate, and one end of the second screw rod 9 is mounted on branch receptacle by bearing 8
On frame 12；Barricade bottom is provided with seepage flow aquaporin 36.
Barricade recreation room 6 in the present embodiment is the sports center that barricade realizes 3 kinds of active movement modes.RB patterns are gears
Wall lower end is motionless, under the action of the second screw rod, barricade around lower rotation pattern, as shown in Figure 4；RT patterns are barricade upper ends
It is motionless, under the action of the second screw rod, the pattern that barricade is rotated around top, as shown in Figure 5；T patterns are barricades in the second screw rod
Under the action of, the pattern that barricade moves integrally in the horizontal direction, as shown in Figure 6.
Barricade dynamical system in the present embodiment is located in barricade recreation room, and reaction frame system 7 is adjacent with the compartment.It is keeping off
It is equipped with the sheet metal 14 of one piece of 5mm thickness 50cm high 90cm long among wall recreation room 6 and reaction frame 7, can be filled out in barricade recreation room
Build 25cm high normal sand simulation foundation pit inside, row's circular hole 14 is also drilled on sheet metal, can play increase water level saturation and
Realize the effect of steady seepage.
Power transformation electric power supply control system in the present embodiment is mainly made of power transformation power supply box 35, outer needed for the control system
Boundary's input voltage is 220V, and barricade dynamical system is connected to by the outlet line of the electronic box other end after input voltage decompression.Its
In, power transformation power supply box be equipped with can automatic control device, including power switch 16, barricade forward-reverse switch 26 and barricade move
Speed adjusting knob 25.Power transformation electric power supply control system can realize 3 kinds of active movement modes, i.e. RB patterns, RT patterns and T patterns.
Reaction frame system in the present embodiment is located at the right end of entire model casing, and agent structure is by 1.5cm thickness rectangle steels
Pipe is welded.The power that barricade dynamical system passes over is dispensed by screw fixed T steel frame, and fixation can be played
Motor, the effect safeguarded stability with safety.The outlet line of power transformation power supply box is also along counter-force in power transformation electric power supply control system
Frame outer wall is connect with motor, be can avoid the obstruction of experiment process, is played the effect of simple and beautiful.
Barricade dynamical system in the present embodiment is one of the key component of entire test model case, is located at barricade activity
Chamber interior, core component include claw type support 10, abutment bracket 12, the second screw rod 9, shaft 11, motor 24 and frequency converter 13
Deng.Wherein, one end of two rod pieces up and down of claw type support 10 and barricade and soil pressure acquisition system is measured by hinge to connect
It is connected together.Frequency converter 13 is mounted on motor 24, frequency converter 13 and electricity in the power transformation power supply box in power transformation electric power supply control system
Resistance element is connected, and controls frequency converter by the electronic component of control handle, and then control motor and rotate speed, finally controls barricade
Move speed, frequency converter 13 and motor 24 be fixed by screws in together on the steel of model casing external frame, then with counter-force
T steel frame 17 in frame system is connected.Abutment bracket 12 limits the vertical displacement of the second screw rod, and providing support for the system keeps
Stablize.
It includes soil pressure cell barricade, miniature osmometer barricade, mark that the barricade and soil pressure, which measure acquisition system mainly,
Quasi- sand fills indoor fixation steel plate, dynamic static strain testing instrument.Using barricade made of plank as shown in fig. 7, the ruler of barricade
Very little height × width x thickness is 1350mm × 800mm × 20mm, and surface is drilled with 6 available bolts and fills indoor fixation with normal sand
The circular hole 14 of steel plate connection, arrangement soil pressure cell 27, miniature osmometer, arranges 3 row, 21 soil pressures altogether on movable barricade
Box 27.
The subsystem includes balancer 20, sealing waterproofing membrane and seepage flow water pipe and headlamp etc..Balancer
20 can be used for adjusting the height of model casing, keep its holding horizontal and stablize, share 4, pad respectively on the pedestal of model casing.
The present embodiment is a kind of to realize that the operating process of soil pressure calculation device under steady seepage and oscillatory load is as follows：
Embodiment 1：Normal sand active earth pressure is tested under three kinds of wall movement modes.
Experiment tests wide 65cm, high 130cm (finite soil) and width 80cm, high 130cm (the semo-infinite soil body) soil respectively
Active earth pressure value under 3 kinds of barricade wall movement modes of body amounts to 6 groups of experiments, is shown in Table 1.
The step of due to this 6 groups of experiments, is more similar, now with wide 80cm, the high 130cm soil bodys RB patterns under active soil pressure
It is illustrated for power experiment.
Cleaning arranges inside model casing, the soil pressure cell barricade that will be made before, as shown in Figure 7；With 6 screws
It is fixed on normal sand to fill on the steel plate of room, draws the cable of the external deformeter of soil pressure cell 27；It is oozed as shown in figure 8, adjusting
Flowing water reservoir chamber steel plate to specified position, make normal sand fill indoor soil body volume length × width × height be 80cm × 80cm ×
130cm；
2. 21 soil pressure cells is connected to corresponding channel on deformeter, power supply 16 is opened, deformeter is connected with computer,
DHDAS dynamic signal acquisition analysis softwares are opened, project file, the parameter demarcated before input are newly built up；
3. by sticking two-faced adhesive tape between plastic film and after smearing vaseline, being laid on soil pressure cell barricade and test flume both sides steel
Change on the gap between glass, appropriate plasticine is pasted between gap, and carry out waterproof sealing measure；
4. on soil pressure cell barricade after coating lubricating oil, sticking experiment normal sand in its metope, ensureing the thick of wall surface
Rugosity is consistent with the soil body, reduces test error；
5. going to DHDAS dynamic signal acquisition analysis softwares, soil pressure cell sensor is returned to zero；
6. being layered laying standard sand using " artificial knockout " method, the thickness of every layer of normal sand is 15cm, and one has been filled between every layer
The very thin color sand of layer, paves its surface, need to the soil body be stood 48h after filling to specified altitude；
7. standing to after the stipulated time, it is ready for starting to measure, pay attention to first measuring the initial soil pressure force value of a period of time and carries out
Record；
8. having regulated and controled barricade movement velocity, while recording each around the rotation of wall bottom by the method control barricade for realizing RB displacement models
The pressure time-process curve and lateral diaphragm wall displacement value of a soil pressure cell observe damage of soil body process and end-state, carry out stopping motor
The preparation of movement；
9. stopping barricade movement, the move distance of barricade is recorded, measures and record the position of the plane of fracture, maintains collapse state 30
Minute simultaneously continues to record；
10. after the completion of experiment, output barricade moving displacement-time graph, soil pressure force value-buried depth curve and the plane of fracture (color sand position
Set) figure is RB patterns active earth pressure as shown in Figure 10 with buried depth distribution map.
Embodiment 2：The lower finite width sand active earth pressure experiment of steady seepage effect.
Experiment is tested respectively under acting by external hydrostatic pressure and steady seepage acts on master under lower finite width sand RB patterns
Dynamic Water And Earth Pressures total value and pore water pressure force value, amount to 4 groups of experiments, are shown in Table 2.
The step of this 4 groups of experiments, is similar, and only water flowing condition is different, and complements each other with example 1, now with steady seepage
Under the conditions of measure pore water pressure value for be illustrated.
Cleaning arranges inside model casing, adjusts seepage water reservoir chamber steel plate to specified position, normal sand is made to fill interior
Soil body volume length × width × height is 60cm × 80cm × 100cm；It is replaced with miniature osmometer barricade and connects deformeter, by parameter
It inputs in collection analysis software.
2. carrying out waterproof sealing measure, experiment normal sand is sticked in its metope；Soil pressure cell sensor is returned to zero, point
Layer laying standard sand, 48h is stood by the soil body；The initial pore water pressure value for first measuring a period of time adds water and reaches stabilization and oozes
Stream records the time-history curves of flow event and steady seepage.
3. motor is started to start to generate the movement of RB displacement models, the time-history curves and lateral diaphragm wall displacement of each osmometer are recorded
Value observes the destructive process and end-state of the soil body, stops barricade movement, maintains collapse state 30 minutes and continues to record, defeated
Go out figure.Figure 11 show RB patterns active water geostatic shield figure under steady seepage.
Embodiment 3：The lower finite width sand active earth pressure experiment of oscillatory load effect.
The case where there are oscillatory loads in order to simulate foundation pit side, position of the analysis oscillatory load apart from foundation pit side to foundation pit with
And the influence of active earth pressure and the plane of fracture, motor will lie in normal sand and fill interior when experiment, and according to motor to embedding
The distance of the movable barricade of soil pressure cell be provided with " closely 34 ", " middle distance 33 " and " 3 kinds of remote 32 " different location, together
Sample, it is respectively provided with width and is 65cm, is highly 130cm (finite soil) and width is 80cm, is highly 130cm (half nothings
Limiting the soil body) 2 kinds of width soil bodys carry out active earth pressure under RB patterns (wall movement mode implementation method is referring to example 1) and test.
The lower finite width sand active earth pressure experiment of oscillatory load effect is divided into 6 interim experiments, and experiment is still with mark
Quasi- sand be research object, respectively carry out soil body width 65cm motor positions " short distance vibrating motor 34 ", " in apart from vibrating motor
33 " test with active earth pressure under " remote vibrating motor 32 " RB patterns, and soil body width 80cm motor positions " closely vibrate
Active earth pressure is tested under motor " 34, " in apart from vibrating motor 33 " and " remote vibrating motor 32 " RB patterns.The paving of sand
If still using " artificial knockout method ", the soil sample completed stands 48 hours, and experiment is replaced with the barricade of embedding soil pressure cell.
As shown in table 3,6 stages of the lower finite width sand active earth pressure experiment of oscillatory load effect are enumerated
Experiment.
The step of this 6 groups of experiments, is similar, only soil body width and the condition difference of oscillatory load position two, and is conjugated with three kinds
The quasi- sand active earth pressure experiment of pattern index is mutually accepted, and is now illustrated so that width is the experiment of 80cm proximity conditions as an example.
1. cleaning arranges inside model casing, soil pressure cell barricade is installed, adjusts seepage water reservoir chamber steel plate；
2. connecting the channel on deformeter, input parameter to collection analysis software；
3. carrying out waterproof sealing measure, experiment normal sand is sticked in wall surface；Soil pressure cell sensor is returned to zero, is used
" artificial knockout " method is layered laying standard sand using color sand, paves its surface, and the soil body stands 48h；
4. first measuring the initial soil pressure force value of a period of time and recording, vibrating device is then placed to short distance position；
5. Vibration on Start-up motor after stationary vibration for a period of time, starts the movement of RB displacement models, observes the destructive process of the soil body
And end-state, stop barricade movement, after maintaining collapse state vibration a period of time, output data.It is soil pressure shown in Figure 12
Box vibrates timeamplitude map.
Claims (9)
1. soil pressure calculation device under a kind of simulation steady seepage and oscillatory load, including model casing, soil pressure cell, barricade, T shapes
Steelframe, claw type support, abutment bracket, shaft, bearing, motor, frequency converter, dynamic static strain testing instrument and balancer；Its feature
It is：The model casing includes that normal sand fills room, seepage water reservoir chamber and barricade recreation room, power transformation electric power supply control system, anti-
Power frame system, barricade dynamical system, barricade and soil pressure measure acquisition system and sealing waterproof subsystem；Further include moving
The first steel plate and the first screw rod, the second steel plate and the second screw rod；
The appearance profile of the model casing is rectangle box-shaped；The main body frame of model casing is welded by steel, and both sides are inlayed
Tempered glass；Be respectively arranged with seepage water reservoir chamber from left to right inside the model casing main body frame, normal sand fills room and
Barricade recreation room；Seepage water reservoir chamber and normal sand are kept apart between filling room by the first steel plate, and the first steel plate is in support and the
It can make horizontal direction movement under one screw acting；Normal sand, which fills room, is kept apart with barricade recreation room by the second steel plate and barricade,
Second steel plate and barricade under the action of claw type support and the second screw rod, barricade in company with the second steel plate can make horizontal direction it is mobile or
Rotation；Barricade and soil pressure measure acquisition system setting and fill room in normal sand；Power transformation electric power supply control system is mounted on reaction frame
On wall on the outside of system.
2. soil pressure calculation device under a kind of simulation steady seepage according to claim 1 and oscillatory load, feature exist
In the seepage water reservoir chamber is that the place of steady seepage condition is saved, provided to seepage water；The seepage water reservoir chamber
First steel plate of one end is fitted closely with tempered glass both sides and model casing bottom；Middle part is connected with the on first steel plate
One screw rod shakes this first screw rod, the first steel plate can be made to move forward and backward in the horizontal direction, and then adjusts seepage water reservoir chamber
Size.
3. soil pressure calculation device under a kind of simulation steady seepage according to claim 1 and oscillatory load, feature exist
It is the place for carrying out every soil pressure calculation in, the normal sand room of filling, carries out the filling of normal sand, color sand inside it
Embedded and different distance vibrating motor the placement of mark, pressure-measuring pipe；It is filled among room and barricade recreation room also in normal sand
Equipped with the second steel plate, its size can be adjusted by controlling the first steel plate of seepage water reservoir chamber and the second steel plate distance；The normal sand
It is the basic platform for building pressure cell barricade and soil pressure measurement acquisition system to fill the second steel plate of room, and it is prefabricated to be equipped with experiment
The barricade of soil pressure cell and miniature osmometer barricade is mounted on the second steel plate, is needed according to experiment and the method for mutual disassembly is real
The priority of existing barricade is replaced.
4. soil pressure calculation device under a kind of simulation steady seepage according to claim 1 and oscillatory load, feature exist
In the barricade recreation room is the place that barricade realizes 3 kinds of active movement modes, i.e., around the RB patterns of lower rotation, the T of translation
Pattern and around top rotate RT patterns；
The barricade dynamical system is located at barricade recreation room, including the support of the second screw rod, claw type, shaft, abutment bracket, motor and
Frequency converter；One end of two rod pieces up and down that claw type supports and barricade and soil pressure are measured acquisition system and be connected to by hinge
Together；Frequency converter is mounted on motor, and frequency converter is connected with resistive element in the power transformation power supply box in power transformation electric power supply control system,
Frequency converter is controlled by the electronic component of control handle, and then controls motor and rotates speed, the final barricade that controls moves speed, becomes
Frequency device and motor are fixed by screws in together on the steel of model casing external frame, then with the T steel in reaction frame system
Frame is connected；Abutment bracket limits the vertical displacement of the second screw rod, and providing support for the system keeps stablizing.
5. soil pressure calculation device under a kind of simulation steady seepage according to claim 1 and oscillatory load, feature exist
In the power transformation electric power supply control system includes power transformation power supply box, the extraneous input voltage needed for the power transformation electric power supply control system
For 220V, barricade dynamical system is connected to by the outlet line of the power transformation power supply box other end after input voltage decompression；The change
Electric power supply box be equipped with can automatic control device, including power switch, barricade forward-reverse switch and barricade movement speed adjust rotation
Button；Power transformation electric power supply control system can realize 3 kinds of active movement modes, i.e. RB patterns, T patterns and RT patterns.
6. soil pressure calculation device under a kind of simulation steady seepage according to claim 1 and oscillatory load, feature exist
In the reaction frame system is located at the right end mounted on entire model casing, and reaction frame system includes T steel frame, T steel frame one
End mounted on the right metope on, one end withstand with and its agent structure be welded by steel；T steel frame 17 is by barricade power
The power that system passes over dispenses, and the effect that can be played fixed motor, safeguard stability with safety；Power transformation power supply control system
The outlet line of power transformation power supply box is also to be connect with motor along reaction frame system outer wall in system；
Reaction frame system is adjacent with barricade recreation room next door；One block of sheet metal is equipped among barricade recreation room and reaction frame system
In barricade recreation room, it can fill inside the normal sand simulation foundation pit of 25cm high, row's circular hole is also drilled on sheet metal, can be played
Increase water level saturation and realizes the effect of steady seepage.
7. soil pressure calculation device under a kind of simulation steady seepage according to claim 1 and oscillatory load, feature exist
In the barricade and soil pressure measure acquisition system and mainly filled including soil pressure cell barricade, miniature osmometer barricade, normal sand
Indoor fixation steel plate, dynamic static strain testing instrument；Use size height × width x thickness of barricade made of plank for 1350mm ×
800mm × 20mm, surface are drilled with 6 available bolts and fill the circular hole that indoor fixation steel plate is connect with normal sand, arrange soil pressure
Power box, miniature osmometer arrange 3 row, 21 soil pressure cells altogether on movable barricade.
8. soil pressure calculation device under a kind of simulation steady seepage according to claim 1 and oscillatory load, feature exist
In the subsystem includes balancer, sealing waterproofing membrane and seepage flow water pipe and headlamp；Balancer is for adjusting model
The height of case keeps its holding horizontal and stablizes, shares 4, pad respectively on the pedestal of model casing.
9. a kind of soil pressure calculation method under simulation steady seepage and oscillatory load, which is characterized in that the method includes following
Step：
（1）The calibration of soil pressure cell and seepage gauge, test use soil pressure cell and miniature osmometer before manufacture by manufacturer
Calibration was carried out, carries out oil pressure and hydraulic pressure calibration respectively；Testing ground is carried out to existing soil pressure cell and osmometer respectively again
Secondary calibration；
（2）The soil pressure that standard sand under the conditions of anhydrous no-load acts on 3 kinds of barricade active movement modes on retaining wall is measured,
Basis is provided to measure soil pressure calculation under steady seepage and oscillatory load；
（3）Finite width sand active earth pressure under seepage effect is carried out to test：
1）It tests respectively under acting by external hydrostatic pressure and steady seepage acts on active water soil pressure under lower finite width 3 kinds of patterns of sand
Power total value and pore water pressure force value；
2）Cleaning arranges inside model casing, adjusts seepage water reservoir chamber steel plate to specified position and is replaced with miniature osmometer barricade simultaneously
Deformeter is connected, parameter is inputted in collection analysis software；
3）Start motor, make it start to generate displacement model movement, record the time-history curves and lateral diaphragm wall displacement value of each osmometer,
The destructive process and end-state of the soil body are observed, barricade movement is stopped, collapse state is maintained 30 minutes and continues to record, output figure
Shape；
（4）Carry out the lower finite width sand active earth pressure experiment of oscillatory load effect：
1）Cleaning arranges inside model casing, and soil pressure cell barricade is installed, and adjusts seepage water reservoir chamber steel plate；
2）Connect the channel on deformeter, input parameter to collection analysis software；
3）Waterproof sealing measure is carried out, experiment normal sand is sticked in wall surface；Soil pressure cell sensor is returned to zero, is used
" artificial knockout " method is layered laying standard sand using color sand, paves its surface, and the soil body is stood；
4）It first measures the initial soil pressure force value of a period of time and records, then place vibrating device to short distance position；
5) Vibration on Start-up motor after stationary vibration for a period of time, starts 3 kinds of displacement model movements, observes the destructive process of the soil body
And end-state, stop barricade movement, after maintaining collapse state vibration a period of time, output data.
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Cited By (7)
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| CN109440837A (en) * | 2018-12-07 | 2019-03-08 | 湖南大学 | A kind of analog drying and watering cycle and the coefficient retaining wall model test apparatus of underground water and method |
| CN109596501A (en) * | 2019-01-29 | 2019-04-09 | 辽宁工程技术大学 | Top board seepage experimental rig and method under the influence of a kind of dynamic load |
| CN110849729A (en) * | 2019-12-02 | 2020-02-28 | 清华大学深圳国际研究生院 | Limited cohesive soil active and passive soil pressure model test device behind flexible retaining wall of foundation pit |
| CN111046480A (en) * | 2019-12-30 | 2020-04-21 | 西南石油大学 | Method for calculating seismic soil pressure time course of retaining wall based on energy dissipation principle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109440837A (en) * | 2018-12-07 | 2019-03-08 | 湖南大学 | A kind of analog drying and watering cycle and the coefficient retaining wall model test apparatus of underground water and method |
| CN109596501A (en) * | 2019-01-29 | 2019-04-09 | 辽宁工程技术大学 | Top board seepage experimental rig and method under the influence of a kind of dynamic load |
| CN109596501B (en) * | 2019-01-29 | 2023-08-22 | 辽宁工程技术大学 | Roof seepage test device and method under influence of dynamic load |
| CN110849729A (en) * | 2019-12-02 | 2020-02-28 | 清华大学深圳国际研究生院 | Limited cohesive soil active and passive soil pressure model test device behind flexible retaining wall of foundation pit |
| CN110849729B (en) * | 2019-12-02 | 2023-09-22 | 清华大学深圳国际研究生院 | Active and passive soil pressure model test device for limited cohesive soil behind foundation pit flexible retaining wall |
| CN111046480A (en) * | 2019-12-30 | 2020-04-21 | 西南石油大学 | Method for calculating seismic soil pressure time course of retaining wall based on energy dissipation principle |
| CN111173050A (en) * | 2020-01-09 | 2020-05-19 | 西安科技大学 | Tunnel and underground engineering simulation measurement system and method |
| CN112179533A (en) * | 2020-09-18 | 2021-01-05 | 中交天津港湾工程研究院有限公司 | Island wall large-diameter thin-wall steel cylinder comprehensive monitoring system |
| CN112709187A (en) * | 2020-12-14 | 2021-04-27 | 中国水利水电科学研究院 | Impervious short wall simulation device for controlling dike foundation piping development and test method thereof |
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