CN202433536U - Physical model testing system for tunnel-penetrated ground crack zone - Google Patents

Physical model testing system for tunnel-penetrated ground crack zone Download PDF

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Publication number
CN202433536U
CN202433536U CN2012200244445U CN201220024444U CN202433536U CN 202433536 U CN202433536 U CN 202433536U CN 2012200244445 U CN2012200244445 U CN 2012200244445U CN 201220024444 U CN201220024444 U CN 201220024444U CN 202433536 U CN202433536 U CN 202433536U
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China
Prior art keywords
tunnel
solum
monitoring
plate
ground fissure
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Expired - Fee Related
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CN2012200244445U
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Chinese (zh)
Inventor
李凯玲
门玉明
李寻昌
严静平
翟越
刘洪佳
蒋臻蔚
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Changan University
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Changan University
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Abstract

The utility model discloses a physical model testing system for a tunnel-penetrated ground crack zone. The physical model testing system for the tunnel-penetrated ground crack zone comprises a model testing system, a model monitoring system, a model box floor controlling system and a model box, wherein the model box comprises an upper disk soil layer and a lower disk soil layer; a ground crack is preset between the upper disk soil layer and the lower disk soil layer; a tunnel model penetrates through the upper disk soil layer and the lower disk soil layer; the tunnel model can be orthogonal with the ground crack and also can be obliquely intersected with the ground crack; and the bottom plate of the model box is formed by splicing a plate block (A), a plate block (B), a plate block (C) and a plate block (D). The physical model testing system for the tunnel-penetrated ground crack zone is simple in testing method, low in cost and reusable and is used for acquiring a stress-strain relationship and a relative emptying range at the bottom of a tunnel under the condition of a variety of intersecting angles of the ground crack and the tunnel.

Description

A kind of tunnel passes through the physical experiments system of ground fissure band
Technical field
The utility model relates to the physical experiments system that a kind of tunnel passes through the ground fissure band.
Background technology
Ground fissure is a kind of common geologic hazard, and all there is discovery in many countries in the whole world, all finds to have the existence of ground fissure like China, the U.S., Turkey, Thailand, Libya etc.The ground fissure of China distributes very extensively, has scope in recent years and constantly enlarges, the trend that harm constantly increases the weight of.The loss that ground fissure causes is diversified, and direct loss mainly contain face of land industry and covil construction loss, groundwater supply, steam line facility failure loss etc.; Indirect loss is then even more serious, often causes the destruction in factory, workshop to cause stopping production, and pipeline destroyed causes cuts off the water, has a power failure, stops the supple of gas or steam, leaks, leaks gas, causes ecological deterioration etc.Caused the direct economic loss of billions of units up to now in China, the effective utilization and the urban development of town site stayed great potential safety hazard.
And in the ground fissure distributed areas, carry out subway construction, more become an a kind of difficult problem.Common research means comprises site test, numerical simulation and model test.Yet, in actual engineering, be difficult to effectively monitor; The method of numerical simulation can be simulated various working, but does not still have at present the come to nothing finite element model of problem of a kind of accurate description tunnel bottom; Through carrying out model test simulating to different geologic conditions and engineering specifications; Can reflect the interaction relationship between building structure and the rock soil mass intuitively, all sidedly; But also can observe the microdeformation trend of building structure and rock soil mass; Obtain stress and deformation mechanism near actual engineering, and then strong theory support is provided for the foundation of mechanics model.Model test has become a kind of very effective analysis means that is used to study underground structure.Mostly present existing test design is the concrete macrotype model test, and cost is high; After the single test, material can't utilize once more, and the cycle is long; Test can only be passed through sensor acquisition, can't observe the practical distortion situation between the tunnel and the soil body; Testing element is many, in process of deployment, is prone to produce the personal error that is difficult to realize, is difficult to find in the data processing later stage, even pinpoint the problems, because cost is bigger, also is difficult to make an experiment once more correction.
The utility model content
The physical experiments system that the utility model provides a kind of tunnel to pass through the ground fissure band to the deficiency of prior art.
A kind of tunnel passes through the physical experiments system of ground fissure band, comprises model measurement system, Model Monitoring system, model casing ground panel control system and model casing; Said model casing comprises dish solum, lower wall solum, on coil and be preset ground fissure between solum, the lower wall solum, tunnel model passes through and coils solum, lower wall solum, tunnel model can with the ground fissure quadrature also can with the ground fissure oblique; The model casing base plate adopts plate (A), plate (B), plate (C) and four of plates (D) to be spliced; The model casing bottom adopts lifting jack and displacement meter composition model box plate to support and control system, the perpendicular displacement of four plates of controlling models box plate, the motion of going up dish solum, lower wall solum of simulation ground fissure.
Described tunnel passes through the physical experiments system of ground fissure band, and said model measurement system comprises: be embedded in the miniature displacement meter of tunnel bottom, be used for testing tunnel bottom and the soil body amount of coming to nothing relatively; Be embedded in the micro pressure box in dish solum, the lower wall solum, be used for testing the regularity of distribution of soil body soil pressure; Be pasted on tunnel surface each position of strain rosette and pressure cell monitoring tunnel model strained situation and with the contact pressure of last dish solum, lower wall solum; Be arranged on the level meter in the model casing outside, be used for coiling on the monitoring model case displacement situation on solum, lower wall solum surface.
Described tunnel passes through the physical experiments system of ground fissure band; Said Model Monitoring system; Comprise contact pressure monitoring means, strain monitoring unit, tunnel, the tunnel bottom monitoring means that comes to nothing; The contact pressure monitoring means is used to gather the data of micro pressure box to be analyzed, and strain monitoring unit, tunnel is used to gather the data of strain rosette to be analyzed, and the tunnel bottom data that monitoring means is used to gather miniature displacement meter of coming to nothing are analyzed.
The physical experiments system that the tunnel of the utility model passes through the ground fissure band is that a kind of test method of design is simple; Cost is low; Reusable tunnel passes through the physical experiments system of ground fissure band, in order to obtain ground fissure and tunnel stress-strain relation and the tunnel bottom under the situation of the multiple angle of cut scope of coming to nothing relatively.
Description of drawings
Fig. 1 passes through the physical experiments system principle synoptic diagram of ground fissure band for the tunnel;
Fig. 2 is the model casing synoptic diagram, a model casing and ground fissure quadrature, b model casing and ground fissure oblique;
Fig. 3 is model casing base plate splicing figure;
Fig. 4 is tunnel bottom testing longitudinal element relative position figure.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.
With reference to figure 1,, comprise model measurement system, Model Monitoring system, model casing ground panel control system and model casing for the utility model tunnel passes through the physical experiments system principle synoptic diagram of ground fissure band; Said model casing comprises dish solum, lower wall solum; Be preset ground fissure between last dish solum, the lower wall solum; Tunnel model passes through dish solum, lower wall solum; Tunnel model adopts pmma material to make, tunnel model can with ground fissure quadrature (among Fig. 2 shown in a figure) also can with ground fissure oblique (among Fig. 2 shown in the b figure); The model casing base plate adopts plate A, plate B, plate C and four of plate D as shown in Figure 3 to be spliced; Can each plate be linked to each other respectively through bolt: when on try to get to the heart of a matter plate when making up by plate B and plate C with plate D combination, lower wall base plate by plate A, but the quadrature condition of simulation tunnel model and ground fissure; When on try to get to the heart of a matter plate by plate A and plate C form, the lower wall base plate is during by plate B and plate D combination, but the situation of the oblique of simulation tunnel model and ground fissure.
The model casing bottom adopts lifting jack and displacement meter composition model box plate to support and control system, the perpendicular displacement of four plates of controlling models box plate, the motion of going up dish solum, lower wall solum of simulation ground fissure.
With reference to figure 4, the model measurement system comprises, is embedded in the miniature displacement meter of tunnel bottom, is used for the testing tunnel bottom and the soil body amount of coming to nothing relatively; Be embedded in the regularity of distribution of soil pressure in the micro pressure box test soil body in dish solum, the lower wall solum; Be pasted on tunnel surface each position of strain rosette and pressure cell monitoring tunnel model strained situation and with the contact pressure of last dish solum, lower wall solum; At model casing arranged outside level meter, be used for coiling on the monitoring model case displacement situation on solum, lower wall solum surface; Test is excavated section after accomplishing, and understands the interaction situation of tunnel model and ground fissure.
The Model Monitoring system; Comprise contact pressure monitoring means, strain monitoring unit, tunnel, the tunnel bottom monitoring means that comes to nothing; The contact pressure monitoring means is used to gather the data of micro pressure box and analyzes; Strain monitoring unit, tunnel is used to gather the data of strain rosette to be analyzed, and the tunnel bottom data that monitoring means is used to gather miniature displacement meter of coming to nothing are analyzed.
In the time of test, concrete steps are following:
(1) test design.According to test site condition and similarity theory, ground fissure model in the design experiment and tunnel model size.
(2) make tunnel model.Select the corresponding structure material according to testing requirements.For ease of observing the phenomenon of coming to nothing of the tunnel bottom and the soil body, can adopt transmittance to reach 99% organic glass in the test.Under the condition of 20 ℃ of room temperatures, its modulus in compression is 2.47 * 103MPa, is about 1/15 of lining concrete strength grade C50.Tensile strength is 86.56MPa, and expansion and contraction is 4%, proportional limit 72.4MPa.Under last earthing load action, test specimen all is within the perfect elasticity scope in entire test.This tunnel structure is reusable, and utilization factor is high, and cost is lower.After the model tunnel completes, vertically reach circumferential surface in the tunnel and paste foil gauge and micro pressure box.
(3) analogue formation case.With angle steel analogue formation cabinet frame, front and back tank wall material selection tempered glass is in order to observe soil body sedimentation; Woodwork plate is adopted in the left and right sides.Model casing side casing is divided into two parts up and down: the top plank is detachable, makes things convenient for soil body loading and unloading; The bottom plank is fixed, and on the plank of bottom, has the circular hole of diameter 300mm, can stretch into camera the tunnel model inner case that is placed on this position is observed.The model casing base plate is made into four of A, B, C and D, through adopting different connecting methods to connect or the tunnel being put according to certain corner, realizes the different angles of cut in ground fissure and tunnel during use.
(4) reduce the influence of boundary condition to test.Go up the dish soil body and produce between the soil body and the both sides box wall when the inclination angle sinks and rub for reducing, lay double-layer polyethylene film between the soil body and the casing, middle spreading talcum powder.
(5) fill out the upper and lower dish soil body in compacting of subsoil crack.The plate of trying to get to the heart of a matter in the lifting, the placement in layers soil body, the thickness of individual layer are 10cm, leveling back compacting (ram number of times should do the compacting test in advance confirm).Bury the embedding pressure cell in position of pressure cell underground in design.Notice guaranteeing that pressure cell is sunken cord does not receive the influence of coiling sedimentation.
(6) make ground fissure.Establish the seam place at the upper lower burrs base plate and dividing plate is set, after the soil at both sides compacting, take dividing plate away, and the powder fine sand is filled in the preset ground fissure according to crack angle practically.
(7) settle the tunnel.At place, pre-buried tunnel, dig half slot, arrange displacement meter, guarantee that it is vertical; On half slot, place the tunnel.With tunnel bottom leveling, substantial, tunnel bottom is fully contacted with surrounding soil.When placing the tunnel, should guarantee structure level.
(8) placement in layers stratum.Method is identical with step (5).Bury the embedding pressure cell in position of pressure cell underground in design.
(9) after model has filled, in the horizontal observation station of surface arrangement.
(10) leave standstill 12 hours, connect testing apparatus, the test primary data.
(11) sedimenting system of starting characteristics test platform is according to design proposal gradation sedimentation.Leave standstill 11 small records displacement meters, foil gauge and soil pressure cell test data after each sedimentation, until accomplishing sedimentation;
(12) stop the test platform power system, carry out the section excavation, observe and measure the sedimentation and the section cracking situation of ground fissure both sides soil layer along vertical face.
According to the concrete progress of test, process of the test especially tempered glass observation place and organic glass tunnel structure inside are carried out live video.
(13) unload soil, repeating step 4-12 carries out test operation next time according to testing requirements.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection domain of the utility model accompanying claims according to above-mentioned explanation.

Claims (3)

1. the physical experiments system that the tunnel passes through the ground fissure band is characterized in that, comprises model measurement system, Model Monitoring system, model casing ground panel control system and model casing; Said model casing comprises dish solum, lower wall solum, on coil and be preset ground fissure between solum, the lower wall solum, tunnel model passes through and coils solum, lower wall solum, tunnel model can with the ground fissure quadrature also can with the ground fissure oblique; The model casing base plate adopts first plate (A), second plate (B), the 3rd plate (C) and four of the 4th plates (D) to be spliced; The model casing bottom adopts lifting jack and displacement meter composition model box plate to support and control system, the perpendicular displacement of four plates of controlling models box plate, the motion of going up dish solum, lower wall solum of simulation ground fissure.
2. tunnel according to claim 1 passes through the physical experiments system of ground fissure band, it is characterized in that, said model measurement system comprises: be embedded in the miniature displacement meter of tunnel bottom, be used for testing tunnel bottom and the soil body amount of coming to nothing relatively; Be embedded in the micro pressure box in dish solum, the lower wall solum, be used for testing the regularity of distribution of soil body soil pressure; Be pasted on tunnel surface each position of strain rosette and pressure cell monitoring tunnel model strained situation and with the contact pressure of last dish solum, lower wall solum; Be arranged on the level meter in the model casing outside, be used for coiling on the monitoring model case displacement situation on solum, lower wall solum surface.
3. tunnel according to claim 2 passes through the physical experiments system of ground fissure band; It is characterized in that; Said Model Monitoring system comprises contact pressure monitoring means, strain monitoring unit, tunnel, the tunnel bottom monitoring means that comes to nothing, and the contact pressure monitoring means is used to gather the data of micro pressure box and analyzes; Strain monitoring unit, tunnel is used to gather the data of strain rosette to be analyzed, and the tunnel bottom data that monitoring means is used to gather miniature displacement meter of coming to nothing are analyzed.
CN2012200244445U 2012-01-19 2012-01-19 Physical model testing system for tunnel-penetrated ground crack zone Expired - Fee Related CN202433536U (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
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CN103267835A (en) * 2013-04-19 2013-08-28 山东大学 Large-scale fluid-solid coupling model test bench being capable of prefabricating fault and test method
CN105675319A (en) * 2016-01-05 2016-06-15 西南交通大学 Displacement synchronous control device and test method of simulation of tunnel traversing active faults
CN105719342A (en) * 2016-01-05 2016-06-29 首都师范大学 Three-dimensional modeling visualization method and device of ground fracture geologic body
CN105785468A (en) * 2016-01-05 2016-07-20 西南交通大学 Destructive testing apparatus and method for simulating tunnel going through oblique displaced active fault
CN106018755A (en) * 2016-07-29 2016-10-12 江苏省地质调查研究院 Experimental system for large-sized ground fracture physical model
CN106198191A (en) * 2016-07-21 2016-12-07 中国科学院武汉岩土力学研究所 A kind of tunnel error resilience that can consider Strike-slip fault is broken model test apparatus
CN106226808A (en) * 2016-07-20 2016-12-14 西南交通大学 A kind of assay device simulating tunnel seismic response under fault movement and test method
CN106526133A (en) * 2016-12-08 2017-03-22 贵州大学 Large three-dimensional dynamic load mineral similar material physical test platform
CN106644336A (en) * 2016-11-02 2017-05-10 西安建筑科技大学 Ground fracture-crossing experimental system and method for frame structure
CN106769400A (en) * 2016-11-29 2017-05-31 苏州科技大学 Ground fissure place shake table model and bridge response to forced vibration method
CN111173050A (en) * 2020-01-09 2020-05-19 西安科技大学 Tunnel and underground engineering simulation measurement system and method

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* Cited by examiner, † Cited by third party
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CN103267835B (en) * 2013-04-19 2015-06-10 山东大学 Large-scale fluid-solid coupling model test bench being capable of prefabricating fault and test method
CN103267835A (en) * 2013-04-19 2013-08-28 山东大学 Large-scale fluid-solid coupling model test bench being capable of prefabricating fault and test method
CN105675319B (en) * 2016-01-05 2018-01-23 西南交通大学 Simulation tunnel passes through the displacement synchronous control device and test method of active fault
CN105719342A (en) * 2016-01-05 2016-06-29 首都师范大学 Three-dimensional modeling visualization method and device of ground fracture geologic body
CN105785468A (en) * 2016-01-05 2016-07-20 西南交通大学 Destructive testing apparatus and method for simulating tunnel going through oblique displaced active fault
CN105719342B (en) * 2016-01-05 2018-10-02 首都师范大学 A kind of the three-dimensional modeling method for visualizing and device of ground fissure geologic body
CN105675319A (en) * 2016-01-05 2016-06-15 西南交通大学 Displacement synchronous control device and test method of simulation of tunnel traversing active faults
CN106226808A (en) * 2016-07-20 2016-12-14 西南交通大学 A kind of assay device simulating tunnel seismic response under fault movement and test method
CN106198191A (en) * 2016-07-21 2016-12-07 中国科学院武汉岩土力学研究所 A kind of tunnel error resilience that can consider Strike-slip fault is broken model test apparatus
CN106198191B (en) * 2016-07-21 2018-11-20 中国科学院武汉岩土力学研究所 A kind of model test apparatus it is contemplated that the tunnel error resilience of Strike-slip fault is broken
CN106018755A (en) * 2016-07-29 2016-10-12 江苏省地质调查研究院 Experimental system for large-sized ground fracture physical model
CN106018755B (en) * 2016-07-29 2018-10-23 江苏省地质调查研究院 A kind of experimental system of large size ground fissure physical model
CN106644336A (en) * 2016-11-02 2017-05-10 西安建筑科技大学 Ground fracture-crossing experimental system and method for frame structure
CN106644336B (en) * 2016-11-02 2019-02-22 西安建筑科技大学 A kind of frame structure crosses over ground fissure experimental system and method
CN106769400A (en) * 2016-11-29 2017-05-31 苏州科技大学 Ground fissure place shake table model and bridge response to forced vibration method
CN106526133A (en) * 2016-12-08 2017-03-22 贵州大学 Large three-dimensional dynamic load mineral similar material physical test platform
CN111173050A (en) * 2020-01-09 2020-05-19 西安科技大学 Tunnel and underground engineering simulation measurement system and method

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Granted publication date: 20120912

Termination date: 20130119