CN204530607U - Piping Triaxial tester under the different stress condition of a kind of simulation - Google Patents
Piping Triaxial tester under the different stress condition of a kind of simulation Download PDFInfo
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- CN204530607U CN204530607U CN201520188327.6U CN201520188327U CN204530607U CN 204530607 U CN204530607 U CN 204530607U CN 201520188327 U CN201520188327 U CN 201520188327U CN 204530607 U CN204530607 U CN 204530607U
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Abstract
The utility model discloses piping Triaxial tester under the different stress condition of a kind of simulation, belong to hydraulic engineering field, comprise confined pressure room, there are pressure cap, heat-shrink tube and water flow buffer layer in confined pressure indoor, are filled with sample in heat-shrink tube; Pressure cap runs through confined pressure room and connects axial pressurizing device; The first porous plate is provided with between pressure cap and sample, the second porous plate is provided with between sample and water flow buffer layer, providing holes pressure sensor on first porous plate and the second porous plate, axial pressurizing device is provided with loading displacement transducer, sensor for pore water pressure and loading displacement transducer are monitored by external pressure monitoring system; Connect confined pressure room and be provided with confined pressure monitoring system; Connect water flow buffer layer and be provided with water injection control system and interior pressure monitoring system.Compared with prior art, of the present utility modelly utilize inner multi-faceted the exerting pressure of device to reach failure by piping, in real-time monitoring device, the pressure change of each position, provides data to study.
Description
Technical field
The utility model relates to a kind of analogue means of waterpower preventive works, particularly piping Triaxial tester under the different stress condition of a kind of simulation.
Background technology
China flood-fighting in 1998 practice make " piping " one word become well-known, piping is one of reservoir dam common dangerous situation in flood season.The world watch out for dam destroy example the survey showed that, the destruction of causing due to seepage deformation and accident, account for more than 40% of whole class accident.Current China reservoir quantity occupies first place in the world, and wherein the reservoir of 93% is built in the 50-70 age in 20th century, limits by economic technology at that time, and a lot of reservoir is all limit prospecting, limit design and limit construction, leaves great reservoir dam potential safety hazard.Therefore, the study mechanism carrying out dike piping is significant.
The research in early stage shows, piping relates to the phenomenon of the how complicated mechanical behaviors such as pore water flowing, particle migration, porous media distortion.Along with the generation of piping, in hole, fine grained migration, causes the structural adjustment of the soil body, macroscopic structure of soil and mechanical characteristic is changed, as porosity, the infiltrative uneven change of shear strength etc.The change of soil body permeability makes the pore water stress of the soil body change, and the effective stress of the soil body changes thereupon, and this just causes the change of inside soil body stress, and the change of the stress state of the soil body affects again the development of piping conversely.Therefore for the research of piping mechanism, the impact of stress state residing for the soil body must be considered.
But present stage does not have for the experimental rig of piping study mechanism or seldom considers the impact of stress state residing for the soil body, this just causes the achievement in research of gained comprehensively and objectively cannot disclose the mechanism of piping generation development, has had a strong impact on accurate forecast and the process of dike piping dangerous situation.
As a kind of earth and rockfill dam for simulating piping dam-break experiments that the patent No. is 201310089977.0, comprise the dam body built up primarily of native stone bank, the weak floor that can produce piping passage is equipped with according to test requirements document setting position at described dam body, the water pipe running through described dam body is provided with in described weak floor, the tube wall of described water pipe has along its axial direction through hole spaced apart, the upstream extremity that described water pipe is positioned at described dam body is provided with valve.At the trial, can be formed weak floor by water filling in water pipe and wash away, thus simulate and accelerate the formation of dam body inside piping passage.By controlling the time of on-the-spot piping experiment opening exhibition, piping passage formation time in test can be avoided uncontrollable, and then cause field trial failure, even cause the sudden dam break event occurring being difficult to expect; This experimental facilities volume is comparatively large, and is difficult to secondary utilization, can not carry out hydraulic pressure detection to each position of piping inside, does not provide detailed experimental data for later stage research.
Utility model content
The utility model technical issues that need to address are for above-mentioned the deficiencies in the prior art, and provide a kind of consider different stress condition under, can the experimental rig of Real-Time Monitoring experimental facilities each position piping hydraulic pressure inner.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
Piping Triaxial tester under the different stress condition of a kind of simulation, comprise closed confined pressure room, described confined pressure indoor are disposed with pressure cap, heat-shrink tube and water flow buffer layer from top to bottom, the two ends of heat-shrink tube are tightly connected pressure cap and water flow buffer layer respectively, are filled with sample in described heat-shrink tube; Described pressure cap covers in sample one end and headspace, and pressure cap runs through confined pressure room and connects axial pressurizing device; The first porous plate is provided with between described pressure cap and sample, the second porous plate is provided with between described sample and water flow buffer layer, providing holes pressure sensor distinguished by first porous plate and the second porous plate, described axial pressurizing device is provided with loading displacement transducer, sensor for pore water pressure and loading displacement transducer are monitored by external pressure monitoring system; Described confined pressure room has pore, connects confined pressure room and be provided with confined pressure monitoring system; Connect water flow buffer layer and be provided with water injection control system and interior pressure monitoring system; Described pressure cap is communicated with husky water outflow conduit.
As further preferred version, described pressure cap inside is the stepped of annular, and the first porous plate is positioned on the step of pressure cap, and Sha Shui flows out the headspace that in pipeline communication pressure cap, shoulder rank are formed.
As further preferred version, the bore dia on described first porous plate is 1mm-2mm, and the bore dia on described second porous plate is 0.075mm-0.1mm.
As further preferred version, in described water flow buffer layer, be filled with cobble.
beneficial effect
Compared with prior art, piping Triaxial tester under the different stress condition of one simulation of the present utility model, piping regularity of occurrence and development under different stress in analogue means, can the cracked and mobility status of sample in Real-Time Monitoring piping generating process, final settlement after failure by piping; Impact on piping generation critical condition under consideration sample triaxial stress state; The change of the intensity index of sample after failure by piping, porosity change, stiffness variation, for full appreciation soil body piping generation development mechanism provides new angle, simultaneously for dike piping dangerous situation prediction and effectively administer theoretical foundation and technical support be provided, specifically have the following advantages:
1. the indoor water filling of confined pressure improves heat-shrink tube external water pressure, and hydraulic pressure is better than heat-shrink tube internal pressure, prevents heat-shrink tube and sample contacts limit wall from occurring gap, occurs water leakage situation, affect experimental data; And water flow buffer layer is monitored jointly by confined pressure monitoring system and interior pressure monitoring system, be convenient to control water injection control system amount of water, the hydraulic pressure intensity that adjustment that can be more stable applies sample, can change sample and more get information about;
2. axial pressurizing device can simulate the impact force that river levee dam is subject to river, axially applying pressure, sample is extruded, coordinate the first porous plate and the second porous plate can record the pressure at sample two ends, experimental data is provided, simulated scenario validity is higher, and the one the second porous plates are to prevent the impact force of water filling from causing area damage to sample, affect result of the test;
3. pressure cap is communicated with husky water outflow conduit, can to sample after generation failure by piping, and the particle in test and water can flow out, and further collect husky current output, is convenient to calculate the internal damage speed of sample under current impact for a long time and cracked frequency.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is confined pressure chamber interior structural representation;
Wherein, 1-confined pressure room, 2-pressure cap, 3-heat-shrink tube, 4-water flow buffer layer, 5-sample, 6-axial pressurizing device, 71-first porous plate, 72-second porous plate, 8-sensor for pore water pressure, 9-loading displacement transducer, 10-external pressure monitoring system, 11-confined pressure monitoring system, 12-water injection control system, pressure monitoring system in 13-, the husky water outflow conduit of 14-.
Detailed description of the invention
Optimal technical scheme of the present utility model is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, piping Triaxial tester under the different stress condition of one simulation of the present utility model, specifically comprise axial pressure system, confined pressure system and counter-pressure system, main function is realize sample fully saturated, in process of the test, provide axial stress and confined pressure stress to be in specific stress condition to simulate sample, pressure cap 2 is had successively from top to bottom in the confined pressure room 1 closed, heat-shrink tube 3 and water flow buffer layer 4, pressure cap 2, heat-shrink tube 3 and water flow buffer layer 4 form an entirety, usual pressure cap 2 is positioned at top, the two ends of heat-shrink tube 3 are tightly connected pressure cap 2 and water flow buffer layer 4 respectively, sample 5 is filled with in described heat-shrink tube 3, sample 5 is closely wrapped up by heat-shrink tube 3, both ends of the surface and pressure cap 2 and water flow buffer layer 4 be seamless link as far as possible also.
Pressure cap 2 covers in sample 5 one end and headspace, and pressure cap 2 runs through confined pressure room 1 and connects axial pressurizing device 6, and axial pressurizing device 6 generally applies pressure by loading; The first porous plate 71 is provided with between pressure cap 2 and sample 5, the second porous plate 72 is provided with between sample 5 and water flow buffer layer 4, providing holes pressure sensor 8 distinguished by first porous plate 71 and the second porous plate 72, described axial pressurizing device 6 is provided with loading displacement transducer 9, sensor for pore water pressure 8 and loading displacement transducer 9 are monitored by external pressure monitoring system 10, bore dia on first porous plate 71 is 1mm-2mm, cracked sandstone in sample is allowed to pass through, bore dia on described second porous plate 72 is 0.075mm-0.1mm, only allows water to pass through.
Pressure cap 2 inside is the stepped of annular, pressure cap 2 not only directly contacts sample and extrudes, also need to pass through for sandstone and water after piping occurs to discharge, the first porous plate 71 is positioned on the step of pressure cap 2, and husky water outflow conduit 14 is communicated with the headspace that in pressure cap 2, shoulder rank are formed.
Described confined pressure room 1 has pore, for being vented use during water filling, connecting confined pressure room 1 and being provided with confined pressure monitoring system 11; Connect water flow buffer layer 4 and be provided with water injection control system 12 and interior pressure monitoring system 13, confined pressure monitoring system 11 is relative pressure detecting systems with interior pressure monitoring system 13, for regulating the pressure balance of inside and outside.
Simulate the method for testing of piping Triaxial tester under different stress condition, step is as follows:
(1) prepare, sample is installed.First, according to dry density and water content requirement, utilization is split mould and is prepared sample 5, and sample 5 appearance adopts heat-shrink tube 3 closely to wrap up.Secondly, bottom confined pressure room 1, install water flow buffer floor 4, usual cobble, as cushion coat, places the second porous plate 72 on cobble cushion coat, at the second porous plate 72 center placement hole pressure sensor.Then sample 5 is fixed on cobble cushion coat; Sample 5 other end installs the first porous plate 71, and at the first porous plate 71 center also installing hole pressure sensor, opposite side arranges pressure cap 2.Pressure cap 2, heat-shrink tube 3 and water flow buffer layer 4 installation process keep vertical state, and when ensureing that the later stage bears axial compression, unlikely generation eccentric compression, affects test effect.
(2) confined pressure is applied.First, open top vent hole, confined pressure room 1, utilize water injection control system 12 toward slowly water filling in confined pressure room 1, when being all full of confined pressure room 1 until water and overflowing from steam vent, tighten steam vent, stop water filling.Secondly, utilize confined pressure monitoring system 11 and interior pressure monitoring system 13 jointly to detect internal pressure situation and record force value change, finally, open husky water outflow conduit 14, sample 5 starts consolidation process simultaneously.
(3) axial compression is applied.According to sample 5 discharging consolidation process, by loading to axial pressurizing device 6 pressure testing, axial pressurizing device 6 acts on pressure cap 2, loading displacement transducer 9 is positioned on axial pressurizing device 6 for displacement monitoring degree, prevent booster starting shaft to pressurized equipment, apply axial compression, axial force course of exerting pressure is by controller hierarchical loading, the settling amount of sample 5 in consolidation process is paid close attention to by loading displacement transducer 9, after applying one-level load, when sample settling amount no longer changes, start to apply next stage pressure, until be loaded into the axial load of requirement.After sample 5 settlement stability, keep the three dimension stress state residing for the original state soil body in confined pressure and axial compression invariant simulation Practical Project.
(4) osmotic pressure is applied.Water injection control system 12 sustained water injection, start classification and apply osmotic pressure, suppress water and constantly pour sample 5, penetrate into sample 5 and Piping phenomenon occurs, the sensor for pore water pressure at sample 5 two ends can the water pressure at accurate measurement sample two ends, along with water injection control system 12 increases osmotic pressure step by step, the water pressure difference at sample 5 two ends is increasing, just causes the starting of fines in sample 5, migration, and the first porous plate 71 through sample top, finally enter husky water outflow conduit 14 and discharge.Pay close attention in the process, the reading of sample two ends sensor for pore water pressure, the sand production rate data such as variation relation, axial deformation situation in time after the flow of outlet pipe, piping occur.After sample 5 is destroyed, close outlet pipe, head application system, does traditional triaxial test, the intensity parameter of sample after acquisition failure by piping.
By changing confined pressure, repeating above (1) ~ (4) test simulation and being in piping generation development mechanism under different stress condition.For forecast and the early warning of Practical Project piping dangerous situation provide technical support in advance.
The above; be only the application's preferably detailed description of the invention, but the protection domain of the application is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the application discloses; the change that can expect easily or replacement, within the protection domain that all should be encompassed in the application.Therefore, the protection domain of the application should be as the criterion with the protection domain of claim.
Claims (4)
1. piping Triaxial tester under the different stress condition of simulation, it is characterized in that: comprise closed confined pressure room (1), pressure cap (2), heat-shrink tube (3) and water flow buffer floor (4) is disposed with from top to bottom in described confined pressure room (1), the two ends of heat-shrink tube (3) are tightly connected pressure cap (2) and water flow buffer layer (4) respectively, are filled with sample (5) in described heat-shrink tube (3); Described pressure cap (2) covers in sample (5) one end and headspace, and pressure cap (2) runs through confined pressure room (1) and connects axial pressurizing device (6); The first porous plate (71) is provided with between described pressure cap (2) and sample (5), the second porous plate (72) is provided with between described sample (5) and water flow buffer layer (4), first porous plate (71) respectively providing holes pressure sensor (8) upper with the second porous plate (72), described axial pressurizing device (6) is provided with loading displacement transducer (9), sensor for pore water pressure (8) and loading displacement transducer (9) are monitored by external pressure monitoring system (10); Described confined pressure room (1) has pore, connects confined pressure room (1) and be provided with confined pressure monitoring system (11); Connect water flow buffer layer (4) and be provided with water injection control system (12) and interior pressure monitoring system (13); Described pressure cap (2) is communicated with husky water outflow conduit (14).
2. piping Triaxial tester under the different stress condition of one simulation according to claim 1, it is characterized in that: what described pressure cap (2) inside was annular is stepped, first porous plate (71) is positioned on the step of pressure cap (2), and husky water outflow conduit (14) is communicated with the headspace that in pressure cap (2), shoulder rank are formed.
3. piping Triaxial tester under the different stress condition of one simulation according to claim 1, it is characterized in that: the bore dia on described first porous plate (71) is 1mm-2mm, the bore dia on described second porous plate (72) is 0.075mm-0.1mm.
4. piping Triaxial tester under the different stress condition of one simulation according to claim 1, is characterized in that: be filled with cobble in described water flow buffer layer (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520188327.6U CN204530607U (en) | 2015-03-31 | 2015-03-31 | Piping Triaxial tester under the different stress condition of a kind of simulation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520188327.6U CN204530607U (en) | 2015-03-31 | 2015-03-31 | Piping Triaxial tester under the different stress condition of a kind of simulation |
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| CN204530607U true CN204530607U (en) | 2015-08-05 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223071A (en) * | 2015-10-16 | 2016-01-06 | 中国科学院武汉岩土力学研究所 | Can confined pressure be added and retrain sample rotate load maintainer |
| CN106644841A (en) * | 2017-02-22 | 2017-05-10 | 辽宁工程技术大学 | Simulation test device for studying underground engineering piping phenomenon |
| CN107884326A (en) * | 2017-11-09 | 2018-04-06 | 河海大学 | A kind of experimental rig and test method for simulating soil body failure by piping evolution |
| CN110514525A (en) * | 2019-08-29 | 2019-11-29 | 江苏神马电力股份有限公司 | A kind of interior pressure comparative test device |
| CN112540010A (en) * | 2020-11-26 | 2021-03-23 | 北京工业大学 | Triaxial test device and test method for soil stress path piping |
| CN114279938A (en) * | 2021-12-30 | 2022-04-05 | 福州大学 | Particle migration characteristic and priority flow path forming simulation device under water head change |
| CN114577440A (en) * | 2022-03-11 | 2022-06-03 | 浙江大学 | Physical model for generation and development of dike foundation piping and monitoring method |
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2015
- 2015-03-31 CN CN201520188327.6U patent/CN204530607U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223071A (en) * | 2015-10-16 | 2016-01-06 | 中国科学院武汉岩土力学研究所 | Can confined pressure be added and retrain sample rotate load maintainer |
| CN105223071B (en) * | 2015-10-16 | 2018-03-06 | 中国科学院武汉岩土力学研究所 | Confined pressure can be added and constrain the load maintainer of sample rotation |
| CN106644841A (en) * | 2017-02-22 | 2017-05-10 | 辽宁工程技术大学 | Simulation test device for studying underground engineering piping phenomenon |
| CN106644841B (en) * | 2017-02-22 | 2023-10-03 | 辽宁工程技术大学 | Analogue test device of research underground construction engineering piping phenomenon |
| CN107884326A (en) * | 2017-11-09 | 2018-04-06 | 河海大学 | A kind of experimental rig and test method for simulating soil body failure by piping evolution |
| CN110514525A (en) * | 2019-08-29 | 2019-11-29 | 江苏神马电力股份有限公司 | A kind of interior pressure comparative test device |
| CN112540010A (en) * | 2020-11-26 | 2021-03-23 | 北京工业大学 | Triaxial test device and test method for soil stress path piping |
| CN114279938A (en) * | 2021-12-30 | 2022-04-05 | 福州大学 | Particle migration characteristic and priority flow path forming simulation device under water head change |
| CN114279938B (en) * | 2021-12-30 | 2023-12-29 | 福州大学 | Particle migration characteristics and preferential flow path formation simulation device under water head fluctuation |
| CN114577440A (en) * | 2022-03-11 | 2022-06-03 | 浙江大学 | Physical model for generation and development of dike foundation piping and monitoring method |
| CN114577440B (en) * | 2022-03-11 | 2023-12-15 | 浙江大学 | Physical model for generating and developing dyke base piping and monitoring method |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20180331 |
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| CF01 | Termination of patent right due to non-payment of annual fee |