CN108051351B - A kind of loose media osmotic grouting simulation experiment method - Google Patents
A kind of loose media osmotic grouting simulation experiment method Download PDFInfo
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- 230000003204 osmotic effect Effects 0.000 title claims abstract description 28
- 238000004088 simulation Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000007569 slipcasting Methods 0.000 claims abstract description 42
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000007596 consolidation process Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims description 43
- 238000012544 monitoring process Methods 0.000 claims description 26
- 239000011440 grout Substances 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 238000009792 diffusion process Methods 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229940099259 vaseline Drugs 0.000 claims description 3
- 238000012669 compression test Methods 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 3
- 238000005056 compaction Methods 0.000 abstract description 2
- 238000001764 infiltration Methods 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0813—Measuring intrusion, e.g. of mercury
-
- 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
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Dispersion Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of loose media osmotic grouting simulation experiment methods.High pressure water is injected into water pocket gum cover by water hole using constant pressure confining pressure pump, confining pressure is provided, the confining pressure provided is greater than grouting pressure；Valve gum cover is by confining pressure tight loose media when slip casting, under conditions of confining pressure is greater than grouting pressure, it is ensured that loose media slip casting is osmotic grouting, avoids influence of the grouting modes such as compaction grouting and fracture grouting to slip casting effect.Operation of the present invention is convenient, can real simulation osmotic grouting reinforce loose media, loose media is wrapped up by valve gum cover, by water pocket gum cover to loose media Simulation Study On Pressure ground stress environment；So that confining pressure is greater than grouting pressure by adjusting constant pressure confining pressure pump and slip casting pump pressure, loose media osmotic grouting process can be simulated；After slip casting, the consolidation loose media of valve gum cover package, which can completely take out, to be studied；The test result that this method obtains has directive significance to actual engineering design.
Description
Technical field
The present invention relates to a kind of loose media osmotic grouting simulation experiment methods, are suitable for laboratory simulation loose media infiltration note
Slurry.
Background technique
The reinforcing of loose media osmotic grouting is problem common in geotechnical engineering, slurries Diffusion Law and slip casting during slip casting
Loose mass mechanics performance is the key that the practice of loose media grouting and reinforcing after reinforcing.During site operation, loose media is mostly one
In fixed stress field, especially therefore deep geotechnical engineering realizes the laboratory simulation of loose media grouting test, to practical pine
Granular media Grouting engineering tool has very important significance.
But existing laboratory loose media grouting simulation test device mostly uses filling grouting test, cannot reappear ground
Ambient stress, the loose media consolidated form analytic process after grouting reinforcement are also highly difficult.As Chinese patent CN 105527384A is public
A kind of grouting simulation test device and its test method opened, it is tired in the presence of crustal stress, the monitoring of slurries diffusion process can not be applied
It is difficult and be inconvenient to the problem of taking out grouting and reinforcing loose media.Therefore how true reappearance scene ground stress environment, realize slurries show
Track and facilitate the analysis of the loose media consolidated form after grouting reinforcement, is urgent problem.
Summary of the invention
In view of the above-mentioned problems of the prior art, the object of the present invention is to provide a kind of easy to operate, it being capable of true mould
Quasi- loose media osmotic grouting reinforces the stress state of loose media, slurries tracer may be implemented and facilitate the loose media after grouting reinforcement
Whole take out carries out slurries Diffusion Law and intensive analysis, and obtained test result has directive significance to actual engineering design
Osmotic grouting simulation experiment method.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of loose media osmotic grouting simulation experiment method,
The following steps are included:
(1) loose media filling, pressurization: fixed grout outlet screw rod, double gum cover confining pressure loaders are placed vertically makes grout outlet
Screw rod is bonded with ground, is smeared vaseline on the circumferential sealing circular arc of half set and radial seal circular arc of composition valve gum cover and is used
In reinforcing sealing effect, valve gum cover is slowly put into inside double gum cover confining pressure loaders, its outer wall and water pocket gum cover inner wall are made
Fitting；The loose media of field sampling is slowly put into inside valve gum cover to concordant with the top of valve gum cover, grouting port is tightened
Screw rod；The vertical crustal stress of field measurement is σ1, start constant pressure confining pressure pump, constant pressure confining pressure pump pumps out the high pressure water in high-pressure water
And inputted in water pocket gum cover by confining pressure pipeline, confining pressure σ is applied according to live crustal stress level1, pressure stabilizing 10min；
(2) debugging monitoring: starting monitoring host, it is ensured that monitoring host can obtain pump pressure sensor, grouting port pressure passes
The data of sensor, confining pressure sensor and resistivity sensing element；
(3) grouting parameter is set: the slurries for preparing superfine cement slurries are poured into slurry can, opens blender and persistently stirs
It mixes；Start grouting pump, the pressure P of grouting pump is set, keeps it identical as live grouting pressure, the pressure σ of constant pressure confining pressure pump1With note
The pressure P of stock pump meets formula one, it is ensured that double gum cover confining pressure loader sealing safety, slip casting process are osmotic grouting:
σ1- P > 1MPa formula one
(4) slip casting: opening grouting pump, and starts monitoring host simultaneously and start to monitor, and obtains slip casting by pump pressure sensor
Slip casting pump discharge pressure during end passes through the inlet pressure that grouting port pressure sensor obtains double gum cover confining pressure loaders
Power, the outlet pressure that constant pressure confining pressure pump is obtained by confining pressure sensor obtain different location by each resistivity sensing element
Loose media resistance variations；
(5) stop slip casting: compacting pourable body biggish for porosity, when slurries are being to stop from the grout outlet outflow moment
The slip casting moment；Smaller for partial size, porosity compacting pourable body, slurries diffusion length is limited, when resistivity incudes member
The resistivity value that part obtains is to stop the slip casting moment after stablizing, and first stops grouting pump at this time, stands 5min, then stops constant pressure confining pressure
Pump opens manual switch valve pressure release, releases high pressure water；
(6) sampling analysis: after complete pressure release, the consolidation loose media that valve gum cover is wrapped up is taken out, fully consolidated to slurries
Valve gum cover gently to be removed afterwards, consolidation loose media is reinforced to form class cylindrical body, form analysis is diffused to consolidation loose media,
It takes Φ 50mm × 100mm Standard rock sample to carry out uniaxial compression test, determines uniaxial compressive strength and elasticity modulus；
(7) it cleans: cleaning slurry can, blender, pour into clear water in clean slurry can, twice with grouting pump pumping, and
Clean grouting pump and Grouting Pipe.
Preferably, the outer diameter of the valve gum cover is identical as water pocket gum cover internal diameter, and valve gum cover with a thickness of 5mm.
Preferably, grouting pump is constant pressure and flow pump, can be realized two kinds of constant pressure, constant current slip casting modes, constant pressure voltage stabilized range
For 0~6MPa, constant current current stabilization range is 0~600ml/min；Constant pressure confining pressure pumps 0~25MPa of voltage stabilized range, it can provide 0~
The constant confining pressure of 25MPa.
Compared with the existing technology, the present invention has the advantage that
(1) present invention using high pressure water provide confining pressure, pressurization stablize, it is at low cost, water pocket gum cover can by pressurized fluid with
Slip casting fluid thoroughly completely cuts off, easy to operate, and stability is good；Using valve gum cover pre-wrapped loose media, boundary effect is eliminated,
Under the action of confining pressure fastening and grouting reinforcement, loose media and valve gum cover form an entirety, can take out after the completion of slip casting
Whole slip casting test specimen, it is highly beneficial to the intensive analysis of osmotic grouting effect.
(2) present invention realizes simulation loose media osmotic grouting under the conditions of confining pressure, and constant pressure confining pressure pump passes through water hole to water
High pressure water being injected in capsule gum cover, confining pressure being provided, the confining pressure provided is greater than grouting pressure；Valve gum cover is by confining pressure tight
Loose media, under conditions of confining pressure is greater than grouting pressure, it is ensured that loose media slip casting is osmotic grouting, avoids compaction grouting and splits
Split influence of the grouting modes such as slip casting to slip casting effect.Method of the invention is easy to operate, being capable of the infiltration of real simulation loose media
Grouting and reinforcing loose media, obtained test result have directive significance to actual engineering design.
(3) the resistivity sensing element of valve gum cover inner surface symmetrical arrangement of the present invention, can obtain loose test specimen along
The real-time change rule of resistance value in diametrical direction, characterizes slurries in the infiltration of different moments by the variation of different location resistance value
Saturating position realizes the dynamic tracer to osmotic grouting diffusion process.
Detailed description of the invention
Fig. 1 is loose media osmotic grouting simulation test device overall schematic；
Fig. 2 is double gum cover confining pressure loader sectional views；
Fig. 3 is the arc-shaped sealed structural schematic diagram of valve gum cover；
Fig. 4 is the schematic diagram of embedding flexible current transmission line；
In figure: 1, double gum cover confining pressure loaders；2, constant pressure confining pressure pumps；3, high-pressure water；4, confining pressure pipeline；5, manual switch
Valve；6, grouting pump；7, slurry can；8, blender；9, Grouting Pipe；10, host is monitored；11, pump pressure sensor；12, grouting port pressure
Force snesor；13, confining pressure sensor；14, resistivity sensing element；15, resistivity transmission line；16, data transmission link；
17a, fastening nut I；17b, fastening nut II；18, grouting port screw rod；18a. slip casting channel, 19, grout outlet screw rod；19a. goes out
Starch channel；20, column casing；21, water pocket gum cover；21a, the end wing；22, valve gum cover；23, water hole；24, circumferential sealing circular arc；25, diameter
To sealing circular arc；26, flexible current transmission line；27, loose media is consolidated.
Specific embodiment
Below with reference to embodiment, invention is further described in detail.
It is loose media osmotic grouting simulation test device, including grouting system, confining pressure loading system as shown in Figures 1 to 4
With monitoring system,
The confining pressure loading system includes constant pressure confining pressure pump 2 and double gum cover confining pressure loaders 1, double gum cover confining pressure loads
Device 1 includes column casing 20, I 17a of fastening nut for being located at 20 grouting port one end of column casing, the fastening spiral shell for being located at 20 grout outlet one end of column casing
II 17b of mother, is equipped with valve gum cover 22 in the column casing 20, around being equipped with water pocket between 20 inner wall of 22 outer wall of valve gum cover and column casing
Gum cover 21, I 17a of fastening nut and II 17b of fastening nut are screwed in column casing 20 from both ends and end is respectively against water pocket glue
Set 21, the end wing 21a at 21 both ends of water pocket gum cover is respectively placed in the arc-shaped slot of I 17a of fastening nut, II end 17b of fastening nut
In, thus keep the fixation of water pocket gum cover 21 more firm, grouting port one of the grouting port screw rod 18 from double gum cover confining pressure loaders 1
End along axis screw in I 17a of fastening nut along, and 18 center of grouting port screw rod be equipped with slip casting channel 18a, a grout outlet screw rod 19 from
Grout outlet one end of double gum cover confining pressure loaders 1 along axis screw in II 17a of fastening nut along, and in grout outlet screw rod 19 with its axis
Line is equipped with multiple pulp channel 19a in parallel, the outer diameter of the grouting port screw rod 18 and grout outlet screw rod 19 all with valve gum cover 22
Outer diameter it is identical, the water pocket gum cover 21 is double-layer hollow cylinder, and water hole 23, constant pressure confining pressure are equipped in the middle part of double-layer hollow cylinder
The outlet of pump 2 is connected to water hole 23 by confining pressure pipeline 4, and constant pressure confining pressure pump 2 injects height into water pocket gum cover 21 by water hole 23
Water is pressed to provide confining pressure, the confining pressure provided is greater than grouting pressure, it is ensured that slip casting is osmotic grouting, and valve gum cover 22 is tight by confining pressure
Close package loose media；
The grouting system includes slurry can 7, between slurry can 7 and the grouting port screw rod 18 of double gum cover confining pressure loaders 1
It is connected by grouting pipeline 9, and grouting pipeline 9 is equipped with grouting pump 6, and blender 8 is equipped in slurry can 7, grouting pump 6 starches storage
Slurries in tank 7 are transported in the space at double 1 centers of gum cover confining pressure loader by grouting pipeline 9；
The monitoring system includes monitoring host 10, pump pressure sensor 11, grouting port pressure sensor 12, confining pressure sensor
13 and multiple resistivity sensing elements 14, the pump pressure sensor 11 be located at 6 exit of grouting pump, grouting port pressure sensor 12
It is located at the grouting port of double gum cover confining pressure loaders 1, confining pressure sensor 13 is located at the outlet of constant pressure confining pressure pump 2, multiple resistivity
Sensing element 14 is evenly arranged on 22 inner wall of valve gum cover along the length direction of valve gum cover 22, is successively spaced 80mm, pump pressure sensing
Device 11, grouting port pressure sensor 12, confining pressure sensor 13 are electrically connected with monitoring host 10 by data transmission link 16 respectively,
And resistivity sensing element 14 is connected to monitoring host 10, pump pressure sensor 11, grouting port pressure by resistivity transmission line 15
Force snesor 12 and confining pressure sensor 13 detect 6 outlet pressure of grouting pump, double 1 inlet pressures of gum cover confining pressure loader and perseverance respectively
Press confining pressure pump 2 outlet pressures, multiple resistivity sensing elements 14 be evenly arranged on along its length 22 inner wall of valve gum cover and with pine
Granular media fitting can detecte the change in resistance in slurries flow event at the different location of loose media, and be passed by resistivity
Defeated route 15 reaches monitoring host 10 in real time, so that it is determined that slurries diffusion process.Above-mentioned pump pressure sensor 11, grouting port pressure pass
Sensor 12 and confining pressure sensor 13 can use diffused silicon pressure transmitter.
Preferably, the valve gum cover 22 is made of symmetrically arranged two and half sets, and half set passes through circumferential close
Envelope circular arc 24 and radial seal circular arc 25 are spliced together.The seam of half set uses bicircular arcs structure, real under confining pressure effect
It now seals, can be avoided the generation of seepage channel, valve gum cover 22 can eliminate the consolidation loose media 27 of formation by compressive deformation
With the boundary effect of 22 inner wall contact position of valve gum cover.
Preferably, the length of valve gum cover 22 is less than the length of water pocket gum cover 21, and 18 length of grouting port screw rod is greater than fastening
The length of I 17a of nut, the length of grout outlet screw rod 19 are greater than the length of II 17b of fastening nut, can be by water pocket gum cover 21
Pressure realizes better seal.
Preferably, 21 internal diameter of water pocket gum cover is Φ 120mm × 230mm, and 22 outer diameter of valve gum cover is Φ 120mm
×200mm。
Preferably, the water pocket gum cover 21 is cylindrical shape, and end wing 21a is the entity glue of 5mm thickness, 15mm wide.
Preferably, resistivity sensing element 14 is connected by the flexible current transmission line 26 being embedded in 22 inner wall of valve gum cover
It is connected to resistivity transmission line 15.When resistivity monitoring, each monitoring of resistivity sensing element 14 is successively replaced, it is ensured that is formed single
Channel current.
Further, confining pressure pipeline 4 is equipped with manual switch valve 5.It is closed during slip casting, opens and let out after slip casting
Pressure can satisfy confining pressure greater than grouting pressure so as to simulate deep granular media ambient stress, it is ensured that simulation test is infiltration note
Slurry.
Preferably, 9 internal diameter 12mm of Grouting Pipe, biggish internal diameter are able to carry out granular pattern slurries slip casting without plugging.
Preferably, the internal diameter of column casing 20 is Φ 150mm × 300mm, wall thickness 20mm.It can ensure to consolidate loose media 27
It can satisfy along the radial requirement for taking Φ 50mm × 100mm Standard rock sample to carry out mechanical analysis, and can reduce the size as far as possible, letter
Change test difficulty.
The loose media osmotic grouting simulation experiment method carried out using above-mentioned apparatus, comprising the following steps:
(1) loose media filling, pressurization: fixed grout outlet screw rod 19, double gum cover confining pressure loaders 1 are placed vertically makes pulp
Mouth screw rod 19 is bonded with ground, is applied on the circumferential sealing circular arc 24 of half set and radial seal circular arc 25 of composition valve gum cover 22
Vaseline is smeared for reinforcing sealing effect, valve gum cover 22 is slowly put into inside double gum cover confining pressure loaders 1, make its outer wall and
The fitting of 21 inner wall of water pocket gum cover；The loose media of field sampling is slowly put into 22 inside of valve gum cover to the top with valve gum cover 22
Portion is concordant, tightens grouting port screw rod 18；The vertical crustal stress of field measurement is 10MPa, starting constant pressure confining pressure pump 2, constant pressure confining pressure pump 2
Water in high-pressure water 3 is pumped out and passes through confining pressure pipeline 4 and is inputted in water pocket gum cover 21, is enclosed according to the application of live crustal stress level
Press σ1=10MPa, pressure stabilizing 10min；
(2) debugging monitoring: starting monitoring host 10, it is ensured that monitoring host 10 can obtain pump pressure sensor 11, grouting port
The data of pressure sensor 12, confining pressure sensor 13 and resistivity sensing element 14；
(3) grouting parameter is set: the slurries of superfine cement slurries (ratio of mud 1:1, superfine cement are 1250 mesh) will be prepared
It pours into slurry can 7, opens blender 8 and persistently stir；Start grouting pump 6, grouting pump 6 is set according to live grouting pressure 1MPa
Pressure P=1MPa, constant pressure confining pressure pump 2 pressure σ1Need to meet the relationship of formula one with the pressure P of grouting pump 6:
σ1- P > 1MPa formula one
It just can ensure that double gum cover confining pressure loaders 1 seal safety, slip casting process is osmotic grouting, σ in this embodiment1=
10MPa, P=1MPa meet osmotic grouting requirement.
(4) slip casting: opening grouting pump 6, and starts monitoring host 10 simultaneously and start to monitor, and is obtained by pump pressure sensor 11
6 outlet pressure of grouting pump during slip casting terminates obtains entering for double gum cover confining pressure loaders 1 by grouting port pressure sensor 12
Mouthful place's pressure, obtained by confining pressure sensor 13 constant pressure confining pressure pump 2 outlet pressure, obtained by each resistivity sensing element 14
Obtain the loose media resistance variations of different location.
(5) stop slip casting: compacting pourable body biggish for porosity, when slurries are being to stop from the grout outlet outflow moment
The slip casting moment；Smaller for partial size, porosity compacting pourable body, slurries diffusion length is limited, when resistivity incudes member
The resistivity value that part 14 obtains stablize it is constant after to stop the slip casting moment, first stop grouting pump 6 at this time, stand 5min, then stop
Constant pressure confining pressure pump 2 opens 5 pressure release of manual switch valve, releases high pressure water.
(6) sampling analysis: after complete pressure release, the consolidation loose media 27 that valve gum cover 22 wraps up being taken out, complete to slurries
Valve gum cover 22 is gently removed after consolidation, consolidation loose media 27, which is reinforced, forms a 140mm or so high class cylindrical body, to solid
Knot loose media 27 is diffused form, Standard rock sample intensive analysis；Φ 50mm × 100mm Standard rock sample is taken to carry out uniaxial compression examination
It tests, it is final to determine that uniaxial compressive strength is 2.98MPa, elasticity modulus 239.09MPa.
(7) it cleans: cleaning slurry can 7, blender 8, pouring into clear water in clean slurry can 7, (chemical pulp pours into dissolution
Agent), twice with 6 pumping of grouting pump, and clean grouting pump 6 and Grouting Pipe 9.
The outer diameter for the valve gum cover 22 used in the above method is identical as 21 internal diameter of water pocket gum cover, and the thickness of valve gum cover 22
Degree is 5mm.Preferably, grouting pump 6 is constant pressure and flow pump, can be realized two kinds of constant pressure, constant current slip casting modes, constant pressure voltage stabilized range
For 0~6MPa, constant current current stabilization range is 0~600ml/min；Constant pressure confining pressure pumps 2 0~25MPa of voltage stabilized range, it can provide 0~
The constant confining pressure of 25MPa.
Claims (3)
1. a kind of loose media osmotic grouting simulation experiment method, which is characterized in that filled using loose media osmotic grouting simulation test
Set, the loose media osmotic grouting simulation test device include grouting system, confining pressure loading system and monitoring system,
The confining pressure loading system includes constant pressure confining pressure pump (2) and double gum cover confining pressure loaders (1), double gum cover confining pressure loads
Device (1) includes column casing (20), the fastening nut I (17a) for being located at column casing (20) grouting port one end, is located at column casing (20) grout outlet one
The fastening nut II (17b) at end is equipped with valve gum cover (22) in the column casing (20), valve gum cover (22) outer wall and column casing (20)
Column is screwed in from both ends around equipped with water pocket gum cover (21), the fastening nut I (17a) and fastening nut II (17b) between inner wall
In cylinder (20) and end is respectively against water pocket gum cover (21), and the end wing (21a) at water pocket gum cover (21) both ends is respectively placed in fastening spiral shell
I (17a) of mother, the end fastening nut II (17b) arc-shaped slot in, a grouting port screw rod (18) is from double gum cover confining pressure loaders
(1) grouting port one end screws in fastening nut I (17a) along axis, and grouting port screw rod (18) center is equipped with slip casting channel
(18a), a grout outlet screw rod (19) screw in fastening nut II along axis from grout outlet one end of double gum cover confining pressure loaders (1)
In (17a), and parallel with its axis in grout outlet screw rod (19) it is equipped with multiple pulp channels (19a), the grouting port screw rod
(18) and the outer diameter of grout outlet screw rod (19) is all identical as the outer diameter of valve gum cover (22), and the water pocket gum cover is double-layer hollow circle
Barrel structure, and water hole (23) are equipped in the middle part of double-layer hollow cylinder, the outlet that constant pressure confining pressure pumps (2) is connected by confining pressure pipeline (4)
To water hole (23)；
The grouting system includes slurry can (7), the grouting port screw rod (18) of slurry can (7) and double gum cover confining pressure loaders (1)
Between connected by grouting pipeline (9), and grouting pipeline (9) is equipped with grouting pump (6), and blender is equipped in slurry can (7)
(8)；
The monitoring system includes monitoring host (10), pump pressure sensor (11), grouting port pressure sensor (12), confining pressure sensing
Device (13) and multiple resistivity sensing elements (14), the pump pressure sensor (11) are located at grouting pump (6) exit, grouting port pressure
Force snesor (12) is located at the grouting port of double gum cover confining pressure loaders (1), and confining pressure sensor (13) is located at constant pressure confining pressure pump (2)
Outlet, multiple resistivity sensing elements (14) are evenly arranged on valve gum cover (22) inner wall along the length direction of valve gum cover (22)
Face, is successively spaced 80mm, pump pressure sensor (11), grouting port pressure sensor (12), confining pressure sensor (13) respectively with monitoring
Host (10) is electrically connected by data transmission link (16), and resistivity sensing element (14) passes through resistivity transmission line (15)
It is connected to monitoring host (10)；
Test method the following steps are included:
(1) loose media filling, pressurization: fixed grout outlet screw rod (19), double gum cover confining pressure loaders (1) are placed vertically makes pulp
Mouth screw rod (19) is bonded with ground, in circumferential sealing circular arc (24) of half set of composition valve gum cover (22) and radial seal circular arc
(25) vaseline is smeared on for reinforcing sealing effect, valve gum cover (22) is slowly put into double gum cover confining pressure loaders (1)
Portion is bonded its outer wall with water pocket gum cover (21) inner wall；It is internal that the loose media of field sampling is slowly put into valve gum cover (22)
It is extremely concordant with the top of valve gum cover (22), tighten grouting port screw rod (18)；The vertical crustal stress of field measurement is σ1, start constant pressure
Confining pressure pumps (2), and the high pressure water in high-pressure water (3) is pumped out and passes through confining pressure pipeline (4) input water pocket glue by constant pressure confining pressure pump (2)
It covers in (21), confining pressure σ is applied according to live crustal stress level1, pressure stabilizing 10min；
(2) debugging monitoring: starting monitoring host (10), it is ensured that monitoring host (10) can obtain pump pressure sensor (11), slip casting
The data of mouth pressure sensor (12), confining pressure sensor (13) and resistivity sensing element (14)；
(3) grouting parameter is set: the slurries for preparing superfine cement slurries are poured into slurry can (7), opens blender (8) and continues
Stirring；Start grouting pump (6), the pressure P of grouting pump (6) is set, keeps it identical as live grouting pressure, constant pressure confining pressure pumps (2)
Pressure σ1Meet formula one with the pressure P of grouting pump (6), it is ensured that double gum cover confining pressure loaders (1) seal safety, slip casting process
For osmotic grouting:
σ1- P > 1MPa formula one
(4) slip casting: opening grouting pump (6), and starts monitoring host (10) simultaneously and start to monitor, and is obtained by pump pressure sensor (11)
Slip casting terminate during grouting pump (6) outlet pressure, by grouting port pressure sensor (12) obtain double gum cover confining pressures loads
The pressure at inlet of device (1), passes through each resistance at the outlet pressure that constant pressure confining pressure pump (2) is obtained by confining pressure sensor (13)
The loose media resistance variations of rate sensing element (14) acquisition different location；
(5) stop slip casting: compacting pourable body biggish for porosity, when slurries are being to stop slip casting from the grout outlet outflow moment
Moment；Smaller for partial size, porosity compacting pourable body, slurries diffusion length is limited, when resistivity sensing element
(14) to stop the slip casting moment after the resistivity value obtained is stablized, first stop at this time grouting pump (6), stand 5min, then stop permanent
Confining pressure pump (2) is pressed, manual switch valve (5) pressure release is opened, releases high pressure water；
(6) sampling analysis: after complete pressure release, the consolidation loose media (27) of valve gum cover (22) package being taken out, complete to slurries
Valve gum cover (22) is gently removed after consolidation, consolidation loose media (27) reinforces and forms class cylindrical body, to consolidation loose media (27)
It is diffused form analysis, takes Φ 50mm × 100mm Standard rock sample to carry out uniaxial compression test, determines uniaxial compressive strength and bullet
Property modulus；
(7) clean: cleaning slurry can (7), blender (8), clean slurry can pours into clear water in (7), with grouting pump (6) pumping
Twice, and grouting pump (6) and Grouting Pipe (9) are cleaned.
2. loose media osmotic grouting simulation experiment method according to claim 1, which is characterized in that the valve gum cover
(22) outer diameter is identical as water pocket gum cover (21) internal diameter, and valve gum cover (22) with a thickness of 5mm.
3. loose media osmotic grouting simulation experiment method according to claim 1, which is characterized in that the grouting pump (6)
For constant pressure and flow pump, constant pressure voltage stabilized range is 0 ~ 6MPa, and constant current current stabilization range is 0 ~ 600ml/min；Constant pressure confining pressure pumps (2) pressure stabilizing
0 ~ 25MPa of range.
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| CN111764864B (en) * | 2020-07-10 | 2021-07-27 | 中国矿业大学 | Drilling and guniting reinforcement method for loose and broken coal and rock area |
| CN114279934B (en) * | 2021-12-28 | 2023-10-17 | 中国海洋大学 | Island reef water-rich calcareous sandy soil stratum grouting simulation and permeability test device and method |
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