CN106706431A - Testing device and method for measuring tensile strength of reinforced soil - Google Patents
Testing device and method for measuring tensile strength of reinforced soil Download PDFInfo
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- CN106706431A CN106706431A CN201611233468.0A CN201611233468A CN106706431A CN 106706431 A CN106706431 A CN 106706431A CN 201611233468 A CN201611233468 A CN 201611233468A CN 106706431 A CN106706431 A CN 106706431A
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- steel disc
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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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
- G01N2203/0017—Tensile
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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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The invention relates to the field of soil mechanics, in particular to a testing device and method for measuring the tensile strength of reinforced soil. The testing device for measuring the tensile strength of the reinforced soil comprises a preparation mould, a support, a three-cavity bypass pressure device, a pressure loading system, a pressure sensor and a data acquisition system. The pressure loading system exerts pressure on the inner wall of an annular soil test piece through the three-cavity bypass pressure device, and the data acquisition system acquires pressure information detected by the pressure sensor. The high-quality annular soil test piece can be prepared through the test piece assembly preparation mold. The change of the volume of the three-cavity bypass pressure device in the test piece damaging process is measured through a displacement sensor. The three-cavity bypass pressure device is used for exerting pressure, under the assistance of two protective cavities, a measuring cavity can provide continuous, stable and balanced pressure on the whole vertical wall of the measuring cavity, and testing results are effectively improved. The method for effectively measuring the tensile strength of a soil sample is provided and can be used for comparison tests to research influences and reinforcement effects of various reinforced materials on the tensile strength of soil.
Description
Technical field
The present invention relates to soil mechanics field, more particularly to a kind of experimental rig for determining reinforced earth tensile strength and side
Method.
Background technology
Resistance to compression and shearing strength relative to the soil body, tensile strength are typically very small, particularly with some weak soils or saturation
The degree soil body higher, its tensile strength generally only has several kPa even close to 0, is difficult accurately to be measured in test, engineering
In be also usually ignored.Therefore, past little tensile characteristics for considering the soil body in soil mechanics theory and engineering practice.But at certain
Under the conditions of a little specific operations, the phenomenon that the soil body bears tension and destroys is much.As sent out in the soil body under dry environment
The shrinkage crack educated, here it is the result of tension stress effect, the engineering properties of the formation meeting greatly reduction soil body in crack, opposite side
Slope engineering, hydraulic engineering, foundation engineering, environmental geotechnical etc. can all have a negative impact.So, to the tensile strength of the soil body
Studied, and take the tensile strength that corresponding engineering measure improves the soil body there is important engineering significance, in the last few years by
Gradually paid attention to by geotechnical specialist and scholar.Fiber reinforced soil technology is a kind of extensive use, and with very big potentiality
Earthworking reinforced bar technology.The hybrid energy such as fiber and soil greatly improves the other shapes of the cohesive strength without change original material of soil.It
It is a kind of earthwork composite material being combined together to form with the soil body using very thin fibrous material, it has general reinforced earth institute
Without near-isotropic mechanical property and good engineering properties.
At present, both at home and abroad to Fiber reinforced soil resistance to compression and shear strength test research is more, but on Fiber reinforced soil
The research data of tensile strength is few, and the particularly analysis of Influential Factors research to Fiber reinforced soil tensile strength is few.Determine
The test method of soil body tensile strength mainly has direct method and indirect method.Direct method to refer to that directly apply tension at sample two ends straight
To rupture failure, uniaxial tensile test is common are, but the fixation problem of sample is more complicated in process of the test.It is general to use
Fixture or gluing method, but operating process is comparatively laborious, and easily produce stress concentration in sample end and be broken, cause larger
Error.Additionally, the sample making course of direct method also has considerable influence to result of the test.All using cylinder in current many documents
Sample, will soil sample in a mold disposably compacting (up and down uneven) or compaction in layers (there is artificial weak structural face) into
Shape, its compacting direction and posterior drawing direction along sample axial direction, then the system of the obvious test sample compacting process of stretch test result
About.And the tensile strength in view of Fiber reinforced soil is very low, straightway testing difficulty is larger, so needing a kind of survey indirectly of research and development
The experimental rig of Fiber reinforced soil tensile strength is measured to measure its tensile strength.
The content of the invention
The invention provides a kind of experimental rig and method for determining reinforced earth tensile strength, it uses three-chamber side depressor
Pressure applying is carried out, under two auxiliary for protecting chamber, measurement chamber can provide continual and steady balanced on the whole perpendicular wall in measurement chamber
Pressure, effectively improve test effect.There is provided a kind of effective method for determining soil sample tensile strength, can do to having a competition
Test, study influence and reinforcement effects of the various reinforcement materials to soil body tensile strength；
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of experimental rig for determining reinforced earth tensile strength, it is characterised in that：Including for making annular soil sample
Prepare mould, the support for placing annular soil sample, in annular soil sample three-chamber side depressor, for three-chamber
The pressure-loaded system of pressurization in other depressor, for measuring the pressure sensor of pressure and data acquisition system in the depressor of three-chamber side
System, pressure-loaded system is pressurizeed by three-chamber side depressor to the inwall of annular soil sample, the data collecting system collection pressure
The pressure information of force snesor detection.
On the basis of above-mentioned technical proposal, the mould for preparing mainly is made up of annular base, outer ring body and inner ring body.
On the basis of above-mentioned technical proposal, the outer ring body is by the first semicircle outer shroud steel disc, the second semicircle outer shroud steel
Piece and the first semicircle outer shroud steel disc, the second semicircle outer shroud steel disc can be anchored on the fastener composition of one, described the
One semicircle outer shroud steel disc and the second semicircle outer shroud steel disc are combined in and can be spliced into together a full circle, the outer ring body surround ring
Shape base and its internal diameter is consistent with the external diameter of annular base.
On the basis of above-mentioned technical proposal, the inner ring body is by the first inner ring steel disc, the second inner ring steel disc and the 3rd inner ring
Steel disc, the 3rd inner ring steel disc arc length is most short, the 3rd inner ring steel disc be higher than the first inner ring steel disc and the second inner ring steel disc,
The first inner ring steel disc, the second inner ring steel disc and the 3rd inner ring steel disc are combined in and can be spliced into together a full circle, the inner ring
Body can be inserted into annular base center circular hole in and its external diameter is consistent with the diameter of the circular hole at annular base center.
On the basis of above-mentioned technical proposal, the support it is main by the pallet for placing annular soil sample, upper plate and
Connector is constituted, and the upper plate is connected with pallet by connector and is not tried with annular soil positioned at the top of annular soil sample
Sample is in contact, and three-chamber side depressor is fixedly installed on upper plate.
On the basis of above-mentioned technical proposal, three-chamber side depressor is mainly made up of housing, upper barrier film and lower diaphragm plate, institute
State barrier film and lower diaphragm plate by the cavity of housing be divided into upper shield chamber from top to bottom, measurement chamber (and lower shield chamber, the housing,
Upper barrier film and lower diaphragm plate are made of elastomeric material, the internal face phase contract of the outside wall surface in the measurement chamber and annular soil sample
Close.
On the basis of above-mentioned technical proposal, also including three-way connection, the measurement chamber phase of its first end and three-chamber side depressor
Connection, the second end is connected with pressure-loaded system, and the 3rd end is connected with pressure sensor.
On the basis of above-mentioned technical proposal, also including the displacement transducer for detecting annular soil sample radial expansion volume,
Its test side is located in the outside wall surface of annular soil sample, the displacement letter of the data collecting system collection displacement transducer detection
Breath.
A kind of method for determining reinforced earth tensile strength, it is characterised in that carry out as follows：
A) assembling prepares mould and reinforces, and vaseline is smeared on the face that outer ring body is in contact with annular base, by first
Semicircle outer shroud steel disc and the second semicircle outer shroud steel disc dock to form outer ring body and surround annular base, in the outside of outer ring body
Make the first semicircle outer shroud steel disc and the second semicircle outer shroud steel disc fixed together using fastener, in inner ring body and annular
Vaseline is smeared on the face that base is in contact, the first inner ring steel disc, the second inner ring steel disc and the 3rd inner ring steel disc are inserted into annular
In the circular hole at base center and inner ring body is constituted, rigid cylinder is inserted in inner ring body；
B) annular soil sample is prepared, appropriate soil sample is poured into prepares make in mould ground floor soil, ground floor using hitting manually
Real instrument hits reality, and side hammer hits, side movement guide, guide perpendicular to base, ground floor soil hit it is real it is complete after, ground floor upper surface is drawn
Hair, appropriate soil sample is poured into prepare make in mould second layer soil and hit reality, and by that analogy until last layer, last layer should make
Soil sample is slightly above the top surface of mould, the neat mouth equating of the native knife that will be higher by；
C) dismounting prepares mould, when removing outer ring body, first removal of fastening means, then by the first semicircle outer shroud steel disc and
Second semicircle outer shroud steel disc is separately removed；When removing inner ring body, first pull out as the rigid cylinder of inner support, then first pull out
Except the 3rd inner ring steel disc, the first inner ring steel disc and the second inner ring steel disc are finally removed；
D) stationary annular soil sample, annular base is positioned on pallet together with the annular soil sample for preparing, annular bottom
Seat and annular soil sample are together placed on the depressor of three-chamber side to be made in the measurement cavity outer wall and annular soil sample of three-chamber side depressor
Wall agrees with, and upper plate is connected by connector with pallet and positioned at the top of annular soil sample, its lower surface not with annular
Soil sample is contacted, and three-chamber side depressor is fixedly installed on upper plate；
E) the measurement chamber of three-way connection first end and three-chamber side depressor is connected, the second end and pressure-loaded system phase
Connection, the 3rd end is connected with pressure sensor, checks each joint guarantee without not bubbles in leak or oil, and water or oil；
F) water pipe valve everywhere is opened, pressure sensor and displacement transducer is adjusted, turn-on data acquisition system starts pressure
Force loading system, keeps pressure to be slowly increased；
G) instrument board and annular soil sample state of pressure sensor are examined, when pressure declines suddenly, ring is illustrated
Shape soil sample is destroyed, and closes water pipe valve everywhere, stops data acquisition, parses and preserve data；
H) tensile strength of annular soil sample is calculated according to the data and formula (3) for collecting；
Formula (3)：
σθIt is ring direct stress, is always tension；It is the tensile failure intensity of sample；qmaxFor annular soil sample goes out
Maximum internal pressure power during existing crackle；A is the internal diameter of annular soil sample；B is the external diameter of annular soil sample；R is on annular soil sample
Distance and a≤r≤b of any point to the center of circle.
The invention has the advantages that：
1. annular soil sample upper face does not receive friction effects, and result of the test is more accurate.
2. the present invention can prepare high-quality annular soil sample by assembling sample preparation mold.
3. the present invention can be by the change of annular soil sample volume in displacement sensor sample destructive process, to grind
Sample strain-stress relation is studied carefully there is provided certain condition.
4. the present invention carries out pressure applying using three-chamber side depressor, and under upper and lower two auxiliary for protecting chamber, measurement chamber can
Continual and steady pressure in a balanced way is provided with the whole perpendicular wall in measurement chamber, test effect is effectively improved.
5. the invention provides a kind of effective method for determining soil sample tensile strength, contrast test can be done, studied various
Influence and reinforcement effects of the reinforcement material to soil body tensile strength.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described.It should be evident that drawings in the following description are only this
A kind of embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Accompanying drawing according to providing is extended and obtains other implementation accompanying drawings.
Fig. 1 is of the present invention to prepare mould overlooking the structure diagram；
Fig. 2 is the A-A profile structure diagram of Fig. 1；
Fig. 3 is the cross-sectional view of manual compaction test apparatus of the present invention；
Fig. 4 is annular soil sample computation model schematic diagram of the present invention；
Fig. 5 is the structural representation of the experimental rig for determining reinforced earth tensile strength of the present invention；
Specific embodiment
The invention will be further described with example below in conjunction with the accompanying drawings：
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected；Can
Being to be joined directly together, it is also possible to be indirectly connected to by intermediary.For the ordinary skill in the art, can be specific
Situation understands above-mentioned term concrete meaning in the present invention.
As shown in Figure 1, Figure 2 with shown in Fig. 5, a kind of experimental rig of measure reinforced earth tensile strength of the present embodiment, its feature
It is：Including for make annular soil sample 100 prepare mould, the support 2 for placing annular soil sample 100, located at ring
In shape soil sample three-chamber side depressor 3, for three-chamber side depressor in pressurize such as air compressor machine of pressure-loaded system 4,
Pressure sensor 5 and data collecting system 8 for measuring pressure in the depressor of three-chamber side, pressure-loaded system 4 pass through three chambers
The inwall pressurization of 3 pairs of annular soil samples 100 of formula side depressor, the pressure of the data collecting system collection detection of pressure sensor 5
Information.
Preferably, the mould for preparing mainly is made up of annular base 10, outer ring body 11 and inner ring body 12.
Destruction when removing outer ring body 11 for convenience and reducing dismounting to annular soil sample 100, it is preferred that the outer shroud
Body 11 is by the first semicircle outer shroud steel disc 11-1, the second semicircle outer shroud steel disc 11-2 and can be by the first semicircle outer shroud steel disc
11-1, the second semicircle outer shroud steel disc 11-2 are anchored on the fastener composition of one, the described first semicircle outer shroud steel disc 11-
1 and second semicircle outer shroud steel disc 11-2 be combined in and can be spliced into together a full circle, the outer ring body 11 surrounds annular base 10
And its internal diameter is consistent with the external diameter of annular base 10.Wherein fastener can be stirrup or steel wire rope etc., bind round in or be wound in
The outside of outer ring body 11.
Destruction when removing inner ring body 12 for convenience and reducing dismounting to annular soil sample 100, it is preferred that the inner ring
Body 12 is by the first inner ring steel disc 12-1, the second inner ring steel disc 12-2 and the 3rd inner ring steel disc 12-3, the 3rd inner ring steel disc 12-
3 arc length are most short, and the 3rd inner ring steel disc 12-3 is higher than the first inner ring steel disc 12-1 and the second inner ring steel disc 12-2, described first
Inner ring steel disc 12-1, the second inner ring steel disc 12-2 and the 3rd inner ring steel disc 12-3 are combined in and can be spliced into together a full circle, described
Inner ring body 12 can be inserted into the circular hole at the center of annular base 10 and its external diameter and the circular hole at the center of annular base 10 diameter phase one
Cause.
Stationary annular soil sample 100 and three-chamber side depressor 3 for convenience, it is preferred that the support 2 is main by for putting
Pallet 20, upper plate 21 and the connector 22 for putting annular soil sample 100 are constituted, and the upper plate 21 passes through connector 22 and pallet
20 are connected and are not in contact with annular soil sample 100 positioned at the top of annular soil sample 100, and three-chamber side depressor 3 is consolidated
Dingan County is loaded on upper plate 21.
As a specific example of three-chamber side depressor 3, it is preferred that three-chamber side depressor 3 it is main by housing 30,
Upper barrier film 32 and lower diaphragm plate 33 are constituted, the upper barrier film 32 and lower diaphragm plate 33 by the cavity of housing 30 be divided into from top to bottom it is upper
Shield chamber 3-1, measurement chamber 3-2 and lower shield chamber 3-3, the housing 30, upper barrier film 32 and lower diaphragm plate 33 are made of elastomeric material,
The outside wall surface of the measurement chamber 3-2 is mutually agreed with the internal face of annular soil sample 100.Its elastomeric material preferably selects very thin thickness
Rubber.Wherein measurement chamber and upper and lower shield chamber are not connected, but the intercommunication of upper and lower shield chamber, and measurement chamber is clipped in the middle.During experiment
There is pressure medium (water) to pass through intermediate duct system and enter measurement chamber, be radially expanded housing, it is in cylinder that annular soil sample is pressurized
Shape is expanded, so as to soil sample inner wall pressure can be measured.
Connected with lower shield chamber using the three-chamber radial direction pressurization instrument of three-cavity structure, and upper shield chamber, it is advantageously ensured that measurement chamber,
Upper shield chamber is consistent with the pressure in lower shield chamber, and pressure is uniformly applied beneficial to the inwall to annular soil sample.Can be by monitoring of pressurizeing come real
Now shield chamber is consistent with the pressure in measurement chamber.
Preferably, the experimental rig of the measure reinforced earth tensile strength also includes three-way connection 6, its first end and three-chamber
The measurement chamber 3-2 of other depressor 3 is connected, and the second end is connected with pressure-loaded system 4, and the 3rd end is connected with pressure sensor 5
Connect.
In order to the relation for giving the strain of research sample stress provides a kind of approach, it is preferred that the measure reinforced earth tension is strong
The experimental rig of degree also includes the displacement transducer 7 for detecting the radial expansion volume of annular soil sample 100, and its test side is located at ring
In the outside wall surface of shape soil sample 100, the displacement information of the data collecting system collection detection of displacement transducer 7.
A kind of method for determining reinforced earth tensile strength, it is characterised in that carry out as follows：
A) assembling prepares mould and reinforces, and vaseline is smeared on the face that outer ring body 11 is in contact with annular base 10, such as
This can reduce friction, reduce the destruction to annular soil sample 100 when removing outer ring body, by the first semicircle outer shroud steel disc 11-1 with
Second semicircle outer shroud steel disc 11-2 docks to form outer ring body 11 and surround annular base 10, in the outside using tight of outer ring body 11
Being fixedly mounted with to put makes the first semicircle outer shroud steel disc 11-1 and the second semicircle outer shroud steel disc 11-2 fixed together, inner ring body 12 with
Vaseline is smeared on the face that annular base 10 is in contact, friction can be so reduced, reduced when removing inner ring body to annular soil sample
100 destruction, annular base 10 is inserted by the first inner ring steel disc 12-1, the second inner ring steel disc 12-2 and the 3rd inner ring steel disc 12-3
In the circular hole at center and inner ring body 12 is constituted, rigid cylinder is inserted in inner ring body；
B) annular soil sample 100 is prepared, appropriate soil sample is poured into prepares make in mould ground floor soil, ground floor is using manual
Compaction test apparatus hits reality, while hammered with hammer 51, side movement guide 50, guide 50 perpendicular to base, ground floor soil hit it is real it is complete after, by the
One layer of upper surface plucking, appropriate soil sample is poured into prepare make in mould second layer soil and hit reality, by that analogy until last layer,
Last layer should make the top surface of soil sample slightly above mould, the neat mouth equating of the native knife that will be higher by；It is preferred that, divide three layers and hit reality；
C) dismounting prepares mould, when removing outer ring body 11, first removal of fastening means, then by the first semicircle outer shroud steel disc
The semicircles of 11-1 and second outer shroud steel disc 11-2 is separately removed；When removing inner ring body 12, first pull out and justify as the rigidity of inner support
Cylinder, then first pulls out the 3rd inner ring steel disc 12-3, finally removes the first inner ring steel disc 12-1 and the second inner ring steel disc 12-2；
D) stationary annular soil sample 100, pallet 20 is positioned over by annular base 10 together with the annular soil sample 100 for preparing
On, annular base 10 and annular soil sample 100 are together placed on and make the measurement chamber 3-2 of three-chamber side depressor 3 on the depressor 3 of three-chamber side
Outer wall agrees with the annular inwall of soil sample 100, upper plate 21 is connected by connector 22 with pallet 20 and positioned at annular soil
The top of sample 100, its lower surface is not contacted with annular soil sample 100, and three-chamber side depressor 3 is fixedly installed in into upper plate 21
On；
E) the measurement chamber 3-2 of the first end of three-way connection 6 and three-chamber side depressor 3 is connected, the second end and pressure-loaded
System 4 is connected, and the 3rd end is connected with pressure sensor 5, and the test side of displacement transducer 7 is located at into annular soil sample 100
Outside wall surface on, check that each joint ensures without not bubbles in leak, and water；
F) water pipe valve everywhere is opened, pressure sensor and displacement transducer is adjusted, turn-on data acquisition system starts pressure
Force loading system, keeps pressure to be slowly increased；
G) instrument board and the annular state of soil sample 100 of pressure sensor 5 are examined, when pressure declines suddenly, is said
Bright annular soil sample 100 is destroyed, and closes water pipe valve everywhere, stops data acquisition, parses and preserve data；
H) tensile strength of annular soil sample is calculated according to the data and formula (3) for collecting；
Formula (3)：
σθIt is ring direct stress, is always tension；It is the tensile failure intensity of sample；qmaxFor annular soil sample goes out
Maximum internal pressure power during existing crackle；A is the internal diameter of annular soil sample；B is the external diameter of annular soil sample；R is on annular soil sample
Distance and a≤r≤b of any point to the center of circle.
As shown in figure 4, according to theory of elastic mechanics, inside and outside radius is respectively the annular soil sample of a and b in inside pressure q
Under effect：σrAnd σθExpression formula be：
In formula：σrIt is radial normal stress, is always compression；σθIt is ring direct stress, is always tension.And a≤r≤b.By
This is visible, and tension is maximum in annular soil sample inwall.Due to | σθ| ＞ | σr|, and the tensile strength of Fiber reinforced soil is much smaller than
Its compression strength, therefore the destruction of annular soil sample can only be the tensile failure for primarily occur inning inwall.When q constantly increases,
The tensile stress sigma of annular soil sample inwallθReach the tensile strength sigma of materialt, there is crackle in inwall；Due to the stress collection of crack tip
In, crackle extends rapidly and makes sample tensile failure model.Therefore, maximum internal pressure power q when crackle occurs in annulusmaxCorresponding is interior
Wall ring tensionIt is exactly the tensile failure intensity σ of samplet.Obtained by formula (1), its expression formula is as follows：
In specification mentioned herein, numerous specific details are set forth.It is to be appreciated, however, that implementation of the invention
Example can be put into practice in the case of without these details.In instances, known structure and technology is not been shown in detail, with
Just do not obscure the understanding of this description.
Similarly, it will be appreciated that in order to simplify one or more that the disclosure and helping understands in each inventive aspect, exist
Above to the description of exemplary embodiment of the invention in, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the device of the disclosure should be construed to reflect following intention：I.e. required guarantor
The application claims of shield features more more than the feature being expressly recited in each claim.More precisely, such as right
As claim reflects, inventive aspect is all features less than single embodiment disclosed above.Therefore, it then follows tool
Thus claims of body implementation method are expressly incorporated in the specific embodiment, wherein each claim conduct in itself
Separate embodiments of the invention.
Those skilled in the art are appreciated that can be carried out adaptively to the part in the device in embodiment
Change and they are arranged in one or more devices different from the embodiment.Can be the component combination in embodiment
Into a part, and multiple subassemblies can be divided into addition.At least some in except such feature are mutual
Outside repulsion, can be using any combinations to all features disclosed in this specification (including adjoint claims and drawing)
And all parts of so disclosed any device are combined.Unless expressly stated otherwise, this specification is (including adjoint
Claim, summary and accompanying drawing) disclosed in each feature can the alternative features of or similar purpose identical, equivalent by offer come
Instead of.
Although additionally, it will be appreciated by those of skill in the art that some embodiments described herein include other embodiments
In included some features rather than further feature, but the combination of the feature of different embodiments means in of the invention
Within the scope of and form different embodiments.For example, in detail in the claims, embodiment required for protection it is one of any
Mode can use in any combination.All parts embodiment of the invention can realize with hardware, or with them
Combination realize.
It should be noted that above-described embodiment the present invention will be described rather than limiting the invention, and ability
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference symbol being located between bracket should not be configured to limitations on claims.Word "comprising" is not excluded the presence of not
Part or component listed in the claims.Word "a" or "an" before part or component does not exclude the presence of multiple
Such part or component.The present invention can be realized by means of the device for including some different parts.It is some listing
In the claim of part, several in these parts can be embodied by same part.
The above, is only presently preferred embodiments of the present invention, and any formal limitation is not made to the present invention, according to
Any simple modification, equivalent variations and the modification made to above example according to technical spirit of the invention, still fall within this hair
In the range of bright technical scheme.
Claims (10)
1. it is a kind of determine reinforced earth tensile strength experimental rig, it is characterised in that：Including for making annular soil sample (100)
Prepare mould, the support (2) for placing annular soil sample (100), in annular soil sample three-chamber side depressor
(3), for the pressure-loaded system (4) pressurizeed in the depressor of three-chamber side, the pressure for measuring pressure in the depressor of three-chamber side
Force snesor (5) and data collecting system (8), pressure-loaded system (4) is by three-chamber side depressor (3) to annular soil sample
(100) inwall pressurization, the data collecting system gathers the pressure information of pressure sensor (5) detection.
2. it is according to claim 1 it is a kind of determine reinforced earth tensile strength experimental rig, it is characterised in that：The preparation
Mould is mainly made up of annular base (10), outer ring body (11) and inner ring body (12).
3. it is according to claim 2 it is a kind of determine reinforced earth tensile strength experimental rig, it is characterised in that：The outer shroud
Body (11) is by the first semicircle outer shroud steel disc (11-1), the second semicircle outer shroud steel disc (11-2) and can be by the first semicircle outer shroud
Steel disc (11-1), the second semicircle outer shroud steel disc (11-2) are anchored on the fastener composition of one, and described first is semicircle outer
Ring steel disc (11-1) and the second semicircle outer shroud steel disc (11-2) are combined in and can be spliced into together a full circle, the outer ring body (11)
Surround annular base (10) and its internal diameter is consistent with the external diameter of annular base (10).
4. the experimental rig of a kind of measure reinforced earth tensile strength according to Claims 2 or 3, it is characterised in that：It is described
Inner ring body (12) is by the first inner ring steel disc (12-1), the second inner ring steel disc (12-2) and the 3rd inner ring steel disc (12-3), described
Three inner ring steel disc (12-3) arc length are most short, and the 3rd inner ring steel disc (12-3) is higher than in the first inner ring steel disc (12-1) and second
Ring steel disc (12-2), the first inner ring steel disc (12-1), the second inner ring steel disc (12-2) and the 3rd inner ring steel disc (12-3) group
Together in can be spliced into a full circle together, the inner ring body (12) can be inserted into the circular hole at annular base (10) center and its external diameter with
The diameter of the circular hole at annular base (10) center is consistent.
5. it is according to claim 1 it is a kind of determine reinforced earth tensile strength experimental rig, it is characterised in that：The support
(2) be mainly made up of the pallet (20) for placing annular soil sample (100), upper plate (21) and connector (22), it is described on
Top board (21) is connected with pallet (20) by connector (22) and is not tried with annular soil positioned at the top of annular soil sample (100)
Sample (100) is in contact, and three-chamber side depressor (3) is fixedly installed on upper plate (21).
6. it is according to claim 1 it is a kind of determine reinforced earth tensile strength experimental rig, it is characterised in that：Three chamber
Formula side depressor (3) is mainly made up of housing (30), upper barrier film (32) and lower diaphragm plate (33), the upper barrier film (32) and lower diaphragm plate
(33) cavity of housing (30) is divided into upper shield chamber (3-1) from top to bottom, measurement chamber (3-2) and lower shield chamber (3-3), it is described
Housing (30), upper barrier film (32) and lower diaphragm plate (33) are made of elastomeric material, the outside wall surface and ring of the measurement chamber (3-2)
The internal face of shape soil sample (100) mutually agrees with.
7. it is according to claim 1 it is a kind of determine reinforced earth tensile strength experimental rig, it is characterised in that：Also include three
Pass joint (6), the measurement chamber (3-2) of its first end and three-chamber side depressor (3) is connected, the second end and pressure-loaded system
(4) it is connected, the 3rd end is connected with pressure sensor (5).
8. it is according to claim 1 it is a kind of determine reinforced earth tensile strength experimental rig, it is characterised in that：Also include using
In the displacement transducer (7) of annular soil sample (100) radial expansion volume of detection, its test side is located at annular soil sample (100)
In outside wall surface, the data collecting system gathers the displacement information of displacement transducer (7) detection.
9. it is a kind of determine reinforced earth tensile strength method, it is characterised in that carry out as follows：
A) assembling prepares mould and reinforces, and vaseline is smeared on the face that outer ring body (11) is in contact with annular base (10), will
First semicircle outer shroud steel disc (11-1) and the second semicircle outer shroud steel disc (11-2) docking form outer ring body (11) and surround ring
Shape base (10), outside in outer ring body (11) makes the first semicircle outer shroud steel disc (11-1) and the second semicircle using fastener
Shape outer shroud steel disc (11-2) is fixed together, and vaseline is smeared on the face that inner ring body (12) is in contact with annular base (10),
By in the first inner ring steel disc (12-1), the second inner ring steel disc (12-2) and the 3rd inner ring steel disc (12-3) insertion annular base (10)
In the circular hole of the heart and inner ring body (12) is constituted, rigid cylinder is inserted in inner ring body；
B) annular soil sample (100) is prepared, appropriate soil sample is poured into prepares make in mould ground floor soil, ground floor using hitting manually
Real instrument hits reality, and side hammer hits, side movement guide, guide perpendicular to base, ground floor soil hit it is real it is complete after, ground floor upper surface is drawn
Hair, appropriate soil sample is poured into prepare make in mould second layer soil and hit reality, and by that analogy until last layer, last layer should make
Soil sample is slightly above the top surface of mould, the neat mouth equating of the native knife that will be higher by；
C) dismounting prepares mould, when removing outer ring body (11), first removal of fastening means, then by the first semicircle outer shroud steel disc
(11-1) and the second semicircle outer shroud steel disc (11-2) are separately removed；When removing inner ring body (12), first pull out as inner support
Rigid cylinder, then first pulls out the 3rd inner ring steel disc (12-3), finally removes the first inner ring steel disc (12-1) and the second inner ring
Steel disc (12-2)；
D) stationary annular soil sample (100), pallet is positioned over by annular base (10) together with the annular soil sample (100) for preparing
(20) on, annular base (10) and annular soil sample (100) are together placed on three-chamber side depressor (3) and make three-chamber side depressor
(3) measurement chamber (3-2) outer wall agrees with annular soil sample (100) inwall, by upper plate (21) by connector (22) and support
Disk (20) is connected and positioned at the top of annular soil sample (100), and its lower surface is not contacted with annular soil sample (100), by three
Cavate side depressor (3) is fixedly installed on upper plate (21)；
E) three-way connection (6) first end is connected with the measurement chamber (3-2) of three-chamber side depressor (3), the second end adds with pressure
Loading system (4) is connected, and the 3rd end is connected with pressure sensor (5), checks that each joint ensures without leak or oil, and water or
Not bubbles in oil；
F) water pipe valve everywhere is opened, pressure sensor and displacement transducer is adjusted, turn-on data acquisition system starts pressure and adds
Loading system, keeps pressure to be slowly increased；
G) instrument board and annular soil sample (100) state of pressure sensor (5) are examined, when pressure declines suddenly, is said
Bright annular soil sample (100) destruction, closes water pipe valve everywhere, stops data acquisition, parses and preserve data；
H) tensile strength of annular soil sample is calculated according to the data and formula (3) for collecting；
Formula (3)：
σθIt is ring direct stress, is always tension；It is the tensile failure intensity of sample；qmaxFor splitting occurs in annular soil sample
Maximum internal pressure power during line；A is the internal diameter of annular soil sample；B is the external diameter of annular soil sample；R is any on annular soil sample
A little to the distance and a≤r≤b in the center of circle.
10. it is according to claim 9 it is a kind of determine reinforced earth tensile strength method, it is characterised in that：In step e)
Also there is step e1) test side of displacement transducer (7) is located in the outside wall surface of annular soil sample (100) and detects annular soil examination
Sample (100) radial expansion volume.
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| CN113933167A (en) * | 2021-10-13 | 2022-01-14 | 中国矿业大学 | Test device for measuring frozen soil tensile strength by hydraulic fracturing method and use method thereof |
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Application publication date: 20170524 |