CN107389543A - Actively and under Passive deformation pattern anchor barricade dodge gate experimental rig and method - Google Patents
Actively and under Passive deformation pattern anchor barricade dodge gate experimental rig and method Download PDFInfo
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- CN107389543A CN107389543A CN201710624066.1A CN201710624066A CN107389543A CN 107389543 A CN107389543 A CN 107389543A CN 201710624066 A CN201710624066 A CN 201710624066A CN 107389543 A CN107389543 A CN 107389543A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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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
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Abstract
Barricade dodge gate pilot model apparatus and method actively and under Passive deformation pattern are anchored the invention discloses a kind of, including support, including support, bolster model box and high-speed camera are distinguished on described two supports, the model box upper opening, model box bottom sets and fixes the first bottom plate and the second bottom plate, and first bottom plate and the second backplanes support set rigid baffle on support between the first bottom plate and the second bottom plate；The rigid baffle is supported jointly by pressure sensor, jack and base, observe pressure sensor readings and hierarchical loading and unloading are carried out to jack, high-speed camera is used for recording the displacement process of soil particle, and laser range finder is used for recording rigid baffle active and passive displacement.
Description
Technical field
The invention belongs to " soil arching effect " to probe into experiment category, is related to a kind of New device structures and type of attachment, specifically
Say, be that barricade dodge gate experimental rig and test method are anchored under a kind of new active and Passive deformation pattern, available for visiting
Study carefully anchoring barricade principle and provide theoretical direction for side slope consolidation projects.
Background technology
At this stage, " soil arching effect " has considerable effect, therefore pile formula road for resistance to shear of soil transfer law
The reinforcement techniques such as dike, sheet pile wall, friction pile, anchorage pile all deploy to study to it.In conventional Piled Embankments design method first
The soil arching effect limit capacity of embankment filled soil is determined, reinforcement material is then determined according to the load for acting on reinforcement material top surface
The pulling force and selected reinforcement material being subjected to.Pile plate wall dorsal part is due to the appearance of soil arching effect so that stake dorsal part and baffle plate dorsal part
There is larger difference in load, soil arching effect generates significant impact to the mode of pile plate wall dorsal part soil pressure transmission.
Soil arch presence change original stress state in the friction pile soil body, cause stresses re-distribution, act on soil arch on
Pressure transmission is into steady soil around.Most of soil pressure after anchorage pile pile slab structure by soil body inhomogeneous deformation and
The space soil arch of formation is directly delivered to anchor head, and the soil pressure of remainder is just delivered to anchor head again through pile slab structure.Fully
Study the mechanism of action of " soil arching effect ", make full use of the characteristics of its stresses re-distribution to become main research direction.
For anchor Rods In Tied Double Retaining Walls structure, acted on by the sidewise restraint of anchor pole (anchor plate), uneven change can occur for wall body
Shape, if wall rigidity Design is reasonable between anchor spacing and anchor, more obvious soil arching effect occurs, and play loading sharing work
With highly beneficial to structure stress.But then, soil arching effect can also cause the redistribution of Wall back pressure, and with dynamic
State evolution Feature, supporting construction stress characteristic is significantly changed, cause traditional design theory to be difficult to be applicable.Therefore, to make full use of
Soil arching effect, structure safety is improved, reduces engineering cost, it is necessary to using pressure dispersing type retaining wall as research object, deeply
Soil arching effect genesis mechanism is analyzed, discloses wall-soil interaction mechanism, establishes soil arching effect mechanical model, inquires into dynamic change
Rule, build and be applicable geostatic shield model." soil arching effect " caused by supporting construction is that most critical is asked in underground engineering
Topic, it is widely present in underground engineering, such as tunnel excavation, pattern foundation pit supporting structure engineering.Its essence is a kind of showing for stress transfer
As.The transfer of this stress is due to that by external force inhomogeneous deformation is occurred for the soil body, is realized by the performance of shear strength.
The content of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of soil arching effect probes into model equipment
And test method, simplified based on mechanics, ignore the influence of pressure dispersing type retaining wall vertical soil arching effect, considered between different anchors
Away from and anchor between wall rigidity, with reference to PFC Micromechanics Analysis, the dodge gate experiment of design anchor tie wall, introduce advanced digital imaging technology
Native arch thrust trajectory is sought, soil arching effect occurrence condition under different displacement models is studied and pattern be present, discloses wall-native phase
Interaction mechanism, build soil arching effect two dimension basic mechanical model.
To achieve the above object, the present invention uses following technical proposals：
Barricade dodge gate experimental rig, including two supports actively and under Passive deformation pattern are anchored, wherein a branch
Model box is installed on frame, high-speed camera is installed on another support, for clearly recording soil body active and Passive deformation pattern
Under destructive process and soil particle displacement state；The described model box upper opening, model box bottom are fixed with
One bottom plate and the second bottom plate, first bottom plate and the second backplanes support are set on support between the first bottom plate and the second bottom plate
Put rigid baffle；The soil body that the bottom of the rigid baffle is provided with inside model box applies stressed jack, and described thousand
The top installation pressure sensor of goldentop, the pressure sensor are used for the loading force for detecting jack；Described a thousand pieces of gold top installation
On a base, and the laser range finder overlapped with the vertical plane of rigid baffle both sides is additionally provided with described base, it is described
Laser range finder be used for record actively and Passive deformation displacement size.
Further, the model box also includes first side plate vertical with the first bottom plate, the second side plate, the 3rd side plate
With the 4th side plate, first side plate and the second side plate are relative, and the 3rd side plate and the 4th side plate are relative, the first side plate, the second side
Plate, the 3rd side plate and the 4th side plate surround box body.
Further, first side plate and the second side plate are fixedly connected with the first bottom plate, the first side plate and the second side
Plate is fixedly connected with the second bottom plate.
Further, the 3rd side plate and the 4th side plate are fixedly connected with the first side plate, the 3rd side plate and the 4th side
Plate is fixedly connected with the second side plate.
Further, first side plate and the second side plate bottom are fixed on support by the first connector.To prevent
Model box topples.
Further, first side plate with the first bottom plate cooperation at the first connecting hole is set, on first bottom plate
Second connecting hole is set, and the first connecting hole and the second connecting hole are connected by the second connector.
Preferably, second connecting hole is slotted hole.
Further, first side plate with the second bottom plate cooperation at the 3rd connecting hole is set, on second bottom plate
4th connecting hole is set, and the 3rd connecting hole and the 4th connecting hole are connected by the 3rd connector.
Preferably, the 4th connecting hole is slotted hole.
Further, second side plate with the first bottom plate cooperation at the 5th connecting hole is set, on first bottom plate
6th connecting hole is set, and the 5th connecting hole and the 6th connecting hole are connected by the 4th connector.
Preferably, the 6th connecting hole is slotted hole.
Further, second side plate with the second bottom plate cooperation at the 7th connecting hole is set, on second bottom plate
8th connecting hole is set, and the 7th connecting hole and the 8th connecting hole are connected by the 5th connector.
Preferably, the 8th connecting hole is slotted hole.
Further, first plate upper surface and the 3rd side plate lower surface flush, the first bottom plate lower surface and the
The equal flush in the lower surface of side plate and the second side plate.
Further, second plate upper surface and the 4th side plate lower surface flush, the second bottom plate lower surface and the
The equal flush in the lower surface of side plate and the second side plate.
Preferably, the cradle top fixes the first top plate and the second top plate, the first backplanes support on the first top plate,
Second backplanes support is on the second top plate.
Further, the spacing between first top plate and the second top plate is more than between the first bottom plate and the second bottom plate
Spacing.
Present invention also offers the experiment side that barricade dodge gate model equipment is anchored under a kind of active and Passive deformation pattern
Method, comprise the following steps：
Step 1：According to the setting moisture content mix soil body, setting time is stood after mix；
Step 2：To set the embedding soil pressure sensor in interval in model box, the soil body after mix is compacted by setting
3 layers of degree point is filled to model box, wharf's pavement quality is carried out on every layer of contact surface, to ensure that earth stress is uniform；
Step 3：Open laser range finder and high-speed camera；
Step 4：Hierarchical loading is carried out to jack by observing pressure sensor readings, sent out with the soil body above dodge gate
Raw passive failure terminates；
Step 5：Jack repeats step 1- steps 3, by observing pressure sensing by the way of load shedding
Device reading carries out load shedding to jack, occurs actively to destroy with the soil body above dodge gate and terminates.
The present invention operation principle be：
The good soil sample of configured in advance is filled in model box for 3 layers according to certain compactness point, treats that sample fills completion
Afterwards, the reading of pressure sensor is used for recording and controlling the size of active and passive earth pressure, and laser range finder is used for recording master
Dynamic and Passive deformation displacement size, test the change of soil pressure by soil pressure cell, and high-speed camera records soil body master
The dynamic and displacement state of the destructive process under Passive deformation pattern and soil particle.
Beneficial effects of the present invention are：
1st, the present invention, which proposes, anchors barricade dodge gate experimental rig and examination under a kind of new active and Passive deformation pattern
Proved recipe method, probed into available for various soil mass " soil arching effect ", overcome existing " soil arching effect " laboratory test and probe into not
Foot, can be that " soil arching effect " probes into offer new approaches.
2nd, mould processing of the present invention is convenient, is readily disassembled and carries, can reuse.
3rd, the present invention only realizes the active of the soil body and passive force modes by the loading and unloading of a jack,
Material is saved, saves space, while be also easy to control.
4th, laser range finder of the present invention be used for record actively and Passive deformation displacement size, it is ensured that experiment it is accurate
Property.
5th, the present invention is used as filler from suprasil sand, and high-speed camera is shot, and can clearly record soil body active
And destructive process and the displacement state of soil particle under Passive deformation pattern.
6th, the first bottom plate and the second bottom plate top of the invention are concordant with the 3rd side plate and the 4th side plate bottom, the first bottom
Plate and the second bottom plate bottom are concordant with the first side plate and the second side plate bottom, it is ensured that the globality of model box, in model box
The soil body will not be dropped out by the gap of bottom plate and side plate.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, the application's
Schematic description and description is used to explain the application, does not form the improper restriction to the application.
Fig. 1 is the axonometric drawing of structure of the present invention；
Fig. 2 is structure base slab axonometric drawing of the present invention；
Fig. 3 is model box substructure axonometric drawing of the present invention；
Fig. 4 is left plate schematic diagram；
Fig. 5 is front side board schematic diagram；
In figure, 1, support, 2, bottom plate, 3, front side board, 4, left plate, 5, bolt hole, 6, back side panel, 7, angle steel, 8, right side
Plate, 9, rigid baffle, 10, positioning bolt hole, 11, base, 12, laser range finder, 13, jack, 14, pressure sensor,
15th, the first bottom plate, the 16, second bottom plate, 17, high-speed camera, 18, connecting hole, the 19, first top plate, 20 second top plates, 21,
Three top plates.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.Unless
Otherwise indicated, all technologies used herein and scientific terminology have and the application person of an ordinary skill in the technical field
The identical meanings being generally understood that.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise odd number shape
Formula is also intended to include plural form, additionally, it should be understood that, when in this manual use term "comprising" and/or
During " comprising ", it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
As background technology is introduced, in the prior art for anchor Rods In Tied Double Retaining Walls structure, by anchor pole (anchor plate)
Sidewise restraint acts on, and wall body can occur inhomogeneous deformation, if wall rigidity Design is reasonable between anchor spacing and anchor, occur more
Obvious soil arching effect, and loading sharing effect is played, it is highly beneficial to structure stress.But then, soil arching effect also can
Cause the redistribution of Wall back pressure, and there are Dynamic Evolution Characteristics, significantly change supporting construction stress characteristic, cause tradition
Design theory is difficult to be applicable, and in order to solve technical problem as above, present applicant proposes a kind of new active and Passive deformation mould
Barricade dodge gate experimental rig and test method are anchored under formula, is probed into available for various soil mass " soil arching effect ", is overcome existing
There is the deficiency that " soil arching effect " laboratory test is probed into, can be that " soil arching effect " probes into offer new approaches.
The present invention is further described with reference to the accompanying drawings and examples.
As depicted in figs. 1 and 2, barricade dodge gate experimental rig, bag are anchored under a kind of new active and Passive deformation pattern
Include by support 1, bottom plate 2, front side board 3 (i.e. the first side plate), left plate 4 (i.e. the 4th side plate), bolt hole 5, back side panel 6 (i.e.
Two side plates), angle steel 7 (i.e. the first connector), right plate 8 (i.e. the 3rd side plate), rigid baffle 9, the grade of base 11 composition.Bottom plate
2nd, front side board 3, back side panel 6, right plate 8, base 11, support 1 can be made of steel plate, and left plate 4 is using transparent organic
Glass plate is made, in order to the observation of high-speed camera.
Front side board 3, left plate 4, back side panel 6, right plate 8 are vertical with bottom plate 2, front side board 3, left plate 4, back side panel
6th, right plate 8 surrounds model box box body.Whole test model is placed on support 1, and model box is mainly left plate 4, right plate
8th, front side board 3, back side panel 6 etc. are spliced by bolt.
As shown in Figure 4 and Figure 5, left plate 4, leave drilling in the side wall of right plate 8, be respectively provided with front side board 3, back side panel 6
Bolt hole 5, left plate 4, right plate 8 may be contained between front side board 3, back side panel 6, will by penetrating bolt in bolt hole 5
Left plate 4, right plate 8 are fixedly connected with front side board 3, back side panel 6.By tightening front side board 3, the bolt on back side panel 6 come real
The connection of existing front side board 3, back side panel 6 and left plate 4, right plate 8.
To prevent whole model from toppling over, front side board 3, back side panel 6 are stuck on support 1 by angle steel 7.
The first top plate 19 and the second top plate 20 are fixed in the top of support 1, and the first bottom plate 15 is supported on the first top plate 19, the
Two bottom plates 16 are supported on the second top plate 20.Angle steel 7 is securable on the first top plate 19 and the second top plate 20.
Spacing between first top plate 19 and the second top plate 20 is more than or equal between the first bottom plate 15 and the second bottom plate 16
Spacing.
As Figure 2-Figure 5, model equipment bottom plate is combined by bottom plate 2, rigid baffle 9, model box upper opening,
The bottom plate 2 of model box bottom is made up of the moveable bottom plate 16 of first bottom plate 15 and second, the first bottom plate 15 and the second bottom plate 16
Between set rigid baffle 9.The upper surface of first bottom plate 15 and the lower surface flush of left plate 4, the lower surface of the first bottom plate 15 is with before
Side plate 3, the equal flush in the lower surface of back side panel 6.The upper surface of second bottom plate 16 and the lower surface flush of right plate 8, the second bottom plate
16 lower surfaces and front side board 3, the equal flush in the lower surface of back side panel 6.
Back side panel 6 is identical with the structure of front side board 3, and left plate 4 is identical with the structure of right plate 8 but material is different.Fig. 5
In, the two bottom sides of front side board 3 are respectively provided with connecting hole 18, likewise, the two bottom sides of back side panel 6 are respectively provided with connecting hole 18, the first bottom
The bottom plate 16 of plate 15 and second is respectively provided with positioning bolt hole 10 (i.e. connecting hole), and positioning bolt hole 10 is slotted hole, the first bottom plate
15th, the second bottom plate 16 is connected with front side board 3, back side panel 6 by positioning bolt hole 10, connecting hole 18, passes through different connecting holes
18 and the connection of positioning bolt hole 10, or the connection of the diverse location of positioning bolt hole 10 and connecting hole 18, thus it is possible to vary the
The position of one bottom plate 15 and the second bottom plate 16.
Laser range finder 12 is placed on base 11, is located at rigid baffle both sides on same vertical plane to record rigidity
The displacement of baffle plate 9.High-speed camera is placed on support 1, and debugging guarantee can photograph complete filler displacement state.
As shown in figure 1, the distance of top plate 19, top plate 20 is more than or equal to the width of rigid baffle 9, in order to jack and swash
The use of optar.
Barricade dodge gate test method actively and under Passive deformation pattern is anchored, is comprised the following steps that：
1) soil body is mixed and stirred according to certain moisture content, after the completion of mixing and stirring, be placed in bucket static 1 day；
2) to set the embedding soil pressure sensor in interval in model box, 3 are divided by setting compactness by the soil body after mix
Layer is filled to model box, wharf's pavement quality is carried out on every layer of contact surface, to ensure that earth stress is uniform；
3) laser range finder and high-speed camera are opened；
4) hierarchical loading is carried out to jack by observing pressure sensor readings, quilt is occurred with the soil body above dodge gate
Dynamic destruction terminates；
5) jack repeats step 1- steps 3 by the way of load shedding, is read by observing pressure sensor
It is several that load shedding is carried out to jack, occur actively to destroy with the soil body above dodge gate and terminate；
6) different loads are recorded and combine video recording arrangement and the analyze data of high-speed camera.
Embodiment：
After suprasil sand is crossed into 5mm sieve apertures, uniform mixing is placed in sealing bucket, after standing 1 day, will be configured in bucket
For the soil body of optimum moisture content 10.1%, 1 day is stood being placed into sealing bucket；Adjusting apparatus, make jack, pressure sensor,
Rigid baffle contacts, and rigid baffle is stuck between first, second bottom plate；According to pre-set dimension arrangement soil pressure cell in the
First, the second bottom plate, rigid baffle upper surface；Filled according to 80% point 3 layers, " plucking " disposal is carried out between each contact surface；Fill
After completion, start high-speed camera and laser range finder；Jack hierarchical loading, classification record soil pressure cell data and
Rigid baffle displacement, until damage of soil body；Carry out what is destroyed under the passive displacement model of the soil body according to the data of video recording and record
Analysis.
As can be seen from the above description, the application the above embodiments realize following technique effect：
Mould processing of the present invention is convenient, is readily disassembled and carries, can reuse.
The present invention only realizes the active of the soil body and passive force modes by the loading and unloading of a jack, saves
Material saving, space is saved, while be also easy to control.
Laser range finder of the present invention is used for recording the size of active and Passive deformation displacement, it is ensured that the accuracy of experiment.
The present invention is used as filler from suprasil sand, and high-speed camera is shot, can clearly record soil body active and
The displacement state of destructive process and soil particle under Passive deformation pattern.
The first bottom plate and the second bottom plate top of the present invention is concordant with the 3rd side plate and the 4th side plate bottom, the first bottom plate
It is concordant with the first side plate and the second side plate bottom with the second bottom plate bottom, it is ensured that the globality of model box, in model box
The soil body will not be dropped out by the gap of bottom plate and side plate.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not the present invention is protected
The limitation of scope, one of ordinary skill in the art should be understood that on the basis of technical scheme, people in the art
Member need not pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (10)
1. barricade dodge gate pilot model apparatus actively and under Passive deformation pattern is anchored, it is characterized in that, including two supports,
Model box is installed on one of support, high-speed camera is installed on another support, for clearly record the soil body actively and by
The displacement state of destructive process and soil particle under dynamic deformation pattern；The described model box upper opening, model box bottom
Portion is fixed with the first bottom plate and the second bottom plate, and first bottom plate and the second backplanes support are on support, the first bottom plate and second
Rigid baffle is set between bottom plate；The soil body that the bottom of the rigid baffle is provided with inside model box is applied stressed very heavy
Top, the top installation pressure sensor on described a thousand pieces of gold top, the pressure sensor are used for the loading force for detecting jack；Described
A thousand pieces of gold top is arranged on a base, and laser range finder is additionally provided with described base, and described laser range finder is used for remembering
Record active and the size of Passive deformation displacement.
2. as claimed in claim 1 actively and under Passive deformation pattern anchor barricade dodge gate experimental rig, it is characterized in that, institute
Stating model box also includes first side plate vertical with the first bottom plate, the second side plate, the 3rd side plate and the 4th side plate, first side
Plate and the second side plate are relative, and the 3rd side plate and the 4th side plate are relative, the first side plate, the second side plate, the 3rd side plate and the 4th side plate
Surround box body.
3. as claimed in claim 2 actively and under Passive deformation pattern anchor barricade dodge gate experimental rig, it is characterized in that, institute
State the 3rd side plate and the 4th side plate is fixedly connected with the first side plate, the 3rd side plate and the 4th side plate are fixed with the second side plate and connected
Connect；First side plate and the second side plate bottom are fixed on support by the first connector.
4. as claimed in claim 2 actively and under Passive deformation pattern anchor barricade dodge gate experimental rig, it is characterized in that, institute
State the first side plate with the first bottom plate cooperation at multiple first connecting holes are set, the second connecting hole is set on first bottom plate,
First connecting hole and the second connecting hole are connected by the second connector；Second connecting hole is slotted hole.
5. as claimed in claim 2 actively and under Passive deformation pattern anchor barricade dodge gate experimental rig, it is characterized in that, institute
State the first side plate with the second bottom plate cooperation at multiple 3rd connecting holes are set, the 4th connecting hole is set on second bottom plate,
3rd connecting hole and the 4th connecting hole are connected by the 3rd connector；4th connecting hole is slotted hole.
6. as claimed in claim 2 actively and under Passive deformation pattern anchor barricade dodge gate experimental rig, it is characterized in that, institute
State the second side plate with the first bottom plate cooperation at multiple 5th connecting holes are set, the 6th connecting hole is set on first bottom plate,
5th connecting hole and the 6th connecting hole are connected by the 4th connector；6th connecting hole is slotted hole.
7. as claimed in claim 2 actively and under Passive deformation pattern anchor barricade dodge gate experimental rig, it is characterized in that, institute
State the second side plate with the second bottom plate cooperation at multiple 7th connecting holes are set, the 8th connecting hole is set on second bottom plate,
7th connecting hole and the 8th connecting hole are connected by the 5th connector；8th connecting hole is slotted hole.
8. as claimed in claim 2 actively and under Passive deformation pattern anchor barricade dodge gate experimental rig, it is characterized in that, institute
State the first plate upper surface and the 3rd side plate lower surface flush, the first bottom plate lower surface with the first side plate and the second side plate
The equal flush in surface；
Second plate upper surface and the 4th side plate lower surface flush, the second bottom plate lower surface and the first side plate and the second side
The equal flush in lower surface of plate.
9. as claimed in claim 1 actively and under Passive deformation pattern anchor barricade dodge gate experimental rig, it is characterized in that, institute
State cradle top and fix the first top plate and the second top plate, the first backplanes support is on the first top plate, and the second backplanes support is in second
On top plate；Spacing between first top plate and the second top plate is more than the spacing between the first bottom plate and the second bottom plate.
10. anchoring barricade dodge gate experimental rig under the active and Passive deformation pattern as described in claim any one of 1-9
Test method, it is characterized in that, comprise the following steps：
Step 1：According to the setting moisture content mix soil body, setting time is stood after mix；
Step 2：To set the embedding soil pressure sensor in interval in model box, divide 3 by setting compactness by the soil body after mix
Layer is filled to model box, wharf's pavement quality is carried out on every layer of contact surface, to ensure that earth stress is uniform；
Step 3：Open laser range finder and high-speed camera；
Step 4：Hierarchical loading is carried out to jack by observing pressure sensor readings, it is passive to occur with the soil body above dodge gate
Destruction terminates；
Step 5：Jack repeats step 1- steps 3, by observing pressure sensor readings by the way of load shedding
Load shedding is carried out to jack, occurs actively to destroy with the soil body above dodge gate and terminates.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333017A (en) * | 2019-07-29 | 2019-10-15 | 宿州市金鼎安全技术股份有限公司 | A kind of coal mine tunnel top board monitor for stress based on fiber-optic grating sensor |
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| CN105890991A (en) * | 2016-04-28 | 2016-08-24 | 中国科学院武汉岩土力学研究所 | Method for testing soil pressure relaxation effects with consideration of soil mass rheology |
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