CN107238693A - A kind of underground water leakage induces the experimental rig and its application method of surface collapse - Google Patents
A kind of underground water leakage induces the experimental rig and its application method of surface collapse Download PDFInfo
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Abstract
The invention discloses the experimental rig and its application method that a kind of leakage of underground water induces surface collapse, belong to Geological Hazards Monitoring early warning technology field.It includes native case, water tank below native case, connection water tank collapses cylinder with native case, native case is stretched into the upper end for collapsing cylinder makes the inner chamber for collapsing cylinder be connected with the inner chamber of native case, the cylinder that collapses stretches into one end of native case provided with soil body screen pack, the lower end for collapsing cylinder stretches into water tank and makes to collapse the inner chamber of cylinder to be connected with the inner chamber of water tank, the cylinder that collapses stretches into one end of water tank provided with the negative pressure test sensor that tube inner chamber pressure is collapsed for testing, the side wall of the water tank is provided with valve and connects a water pump, for testing the water pressure in water tank, surface collapse monitor for monitoring Study on Soil Collapse is installed in the native case.It is effective monitoring and warning surface collapse disaster, optimally descends scheme of project construction to provide scientific basis.
Description
Technical field
The invention belongs to Geological Hazards Monitoring early warning technology field, it is related to the examination that a kind of underground water leakage induces surface collapse
Experiment device and its application method.
Background technology
Surface collapse (ground collapse) is a kind of typical geological disaster, by the end of the year 2012,24 provinces of China
There is surface collapse event in urban district, is mainly distributed on Chongqing, Sichuan, Guizhou, Yunnan, Guangdong, Guangxi, Liaoning, Hebei, river
The provinces, cities and regions such as west, Hubei, Hunan.So far, domestic and foreign scholars have done more research to karst collapse mechanism, it is proposed that Suction
By, the dissolved rock cave in forecasting theory such as latent erosion opinion, oscillation theory, liquefaction opinion, gas explosion opinion；Kyriaki Papadopoulou-
Vryniotia etc. uses the various factors that multivariate statistical method and Study on Geographical Information System karst collapse are produced, establishment
Study the karst collapse susceptibility map in area；Haibo Bai etc. establish research using variable mass mechanics and nonlinear kinetics
Underground water invades the mechanical model of karst strata roof destruction mechanism, and solving result shows, the bigger rock of percolation flow velocity of underground water
Molten top plate formation stability is smaller；He Keqiang etc. analyze the factors such as mining of groundwater to ringing the inner shadow collapsed entirely in Zaozhuang ten
Ring, it is proposed that the countermeasuress of some prevention karst collapses and protection Karst Water Resource and environment；Haijun Zhao etc. are analyzed
The widely distributed karst in southern area of China caves in problem, and the rainfall of high intensity accelerates karst hydrodynamic condition, changes rock
The physical and mechanical properties of solution cavity cave superstratum, and then trigger or promote the formation in cave with collapsing；Mingtang Lei etc.
By large scale test, a kind of karst collapse methods of risk assessment based on GIS-Geographic Information System is established；Xu Weiguo etc.
Think in relatively closed pressure-bearing karst network underground water, take out (row) underground water, water level is reduced to below cap rock bottom surface, can be in rock
Vacuum cup effect, vacuum chamber suction erosion and whirlpool suction funnel are formed in molten space and inhales three kinds of destructions to soil property cap rock of erosion；Congratulate
It can by force wait and Inter-collapse phase critical soil cave height and surface subsidence stage are established based on Pu Shi theories and limit equilibrium theory
Seepage tensor collapse mechanical model.It can be seen that, foregoing research carries out theoretic discussion mainly for karst collapse problem, and shortage can be weighed
It is multiplexed in the dedicated experiments device for exploring surface collapse disaster development overall process.In recent years, with mountain highway and city shallow embedding
A large amount of construction and exploitation in tunnel and the underground space, surface collapse problem are frequently occurred, and predominantly soil property cap rock is collapsed, such as
The Yu Jia gulfs reservoir in the Chongqing firm village of Nikkei mountain gold is in October, 2010 to number line Zhongliang Hill tunnel of in April, 2013 light rail
Road construction period occurs at six surface collapse and causes reservoir dry (referring to Fig. 2 and Fig. 3), causes serious social concern.
During the underground engineering constructions such as road and rail tunnel, Urban Underground cavern, easily cut through in cut-out geologic body
Water-bearing layer, causes underground water to miss, and level of ground water is quickly reduced, so as to induce surface collapse disaster, this in academia and
Engineering circles are built consensus, and research and develop the experimental rig of surface collapse disaster, for science identification, effectively preventing and treating surface collapse disaster,
With necessity and urgency.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide the examination that a kind of leakage of underground water induces surface collapse
Experiment device and its application method.
The object of the present invention is achieved like this：A kind of underground water leakage induces the experimental rig of surface collapse, including soil
Case, the water tank below native case, connection water tank collapse cylinder with native case, and native case is stretched into the upper end for collapsing cylinder to be made to collapse cylinder
Inner chamber connect with the inner chamber of native case, the cylinder that collapses stretches into one end of native case provided with soil body screen pack, described to collapse under cylinder
End stretches into water tank and makes to collapse the inner chamber of cylinder connect with the inner chamber of water tank, it is described collapse cylinder and stretch into one end of water tank be provided with for testing
The negative pressure test sensor of tube inner chamber pressure is collapsed, the side wall of the water tank is provided with valve and one water pump of connection, for testing
Surface collapse monitor for monitoring Study on Soil Collapse is installed in the water pressure in water tank, the native case.
Preferably, the native case, water tank and collapse cylinder and be made of clear material.
Preferably, the native case and water tank are cylindrical.
Preferably, a diameter of 150cm of native case, the height of native case is 100cm, and soil body thickness is 30~80cm, collapses cylinder
A diameter of 10~50cm, a diameter of 80cm of water tank, a height of 100cm of water tank.
Above-mentioned underground water leakage induces the application method of the experimental rig of surface collapse, comprises the following steps：
Firstth, operating condition of test is drafted, soil body type, soil body severe is drafted, soil body compactness, soil body thickness, to collapse cylinder straight
Footpath, water tank water pressure；
Secondth, experiment process, the soil body drafted is filled in the inner chamber of native case, water is then filled into water tank, is opened first
Dynamic surface collapse monitor and negative pressure test sensor, then reach the Water in Water Tank drafted by pumping for water pump to water tank water pressure
Pressure, Study on Soil Collapse situation is monitored by surface collapse monitor, and testing sensor test by negative pressure collapses tube inner chamber pressure,
And the deformation sign of the soil body is examined through native case side standing motionless as if facing a wall；
3rd, test data is analyzed, completes to draft the content of the test under operating condition of test according to experiment process, to test data
Analyzed.
By adopting the above-described technical solution, the present invention has the advantages that：The present invention by native case, water tank, collapse
Cylinder and water pump, negative pressure test sensor and surface collapse monitor etc. measuring equipment composition, form one and can be used for exploringly
Lower water landing induces the experimental rig of surface collapse formation of marine disasters and Evolution., can be in experiment condition using the experimental rig
It is thick across higher than (t/d), soil body type, soil body severe, soil body compactness, lowering of the underground water level speed and landing that lower exploration collapses chamber
The forming process and Evolution of the surface collapse disaster under the conditions of parameter combination such as degree, are especially collapsed collapsing a top by the soil body
Falling to cause to collapse chamber, continuously increase has originality in terms of the fine evolution that surface collapse disaster is produced, and is that effectively monitoring is pre-
Warn surface collapse disaster, optimally descend scheme of project construction to provide scientific basis.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is surface collapse scene photo；
Fig. 3 is surface collapse scene photo.
Reference
In accompanying drawing, 1 is native case, and 2 be water tank, and 3 be water pump, and 4 be that negative pressure tests sensor, and 5 be soil body screen pack, and 6 be valve
Door, 7 is collapse cylinder, and 8 be support, and 9 be surface collapse monitor, and 10 be steelframe.
Embodiment
Embodiments of the invention are described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, underground water leakage induces a kind of embodiment of the experimental rig of surface collapse, including native case 1, positioned at soil
Water tank 2, the connection water tank 2 of the lower section of case 1 collapse cylinder 7 with native case 1, and the upper end for collapsing cylinder 7 stretches into native case 1 and makes to collapse the interior of cylinder 7
Chamber connect with the inner chamber of native case 1, is collapsed cylinder 7 and is stretched into one end of native case 1 provided with soil body screen pack 5, water is stretched into the lower end for collapsing cylinder 7
Case 2 makes the inner chamber for collapsing cylinder 7 be connected with the inner chamber of water tank 2, collapses cylinder 7 and stretches into one end of water tank 2 provided with collapsing cylinder 7 for test
The negative pressure test sensor 4 of chamber pressure, the side wall of water tank 2 is provided with valve 6 and one water pump 3 of connection, for testing in water tank 2
Water pressure, the surface collapse monitor 9 for monitoring Study on Soil Collapse is installed in native case 1.Surface collapse monitor 9 can be used
Surface collapse monitoring in Patent No. " ZL201310541613.1 ", entitled " surface collapse monitoring device and monitoring method "
Device, collapses the inner chamber simulation surface collapse initial cavity of cylinder 7, collapsing the soil body screen pack 5 of the upper end of cylinder 7 setting can filter slightly
Soil, only allows fine earth to be drained through collapsing cylinder 7 into water tank 2, the water pressure in the test water tank 2 of water pump 3, for simulated groundwater drop
Terminal-velocity degree and descent altitude.In the present embodiment, negative pressure test sensor 4 is arranged on the lower end for collapsing cylinder 7, water by a steelframe 10
Case 2 is arranged on support 8.
Native case 1, water tank 2 and collapse cylinder 7 and be made of clear material.Native case 1 and water tank 2 are cylindrical.Native case 1
Diameter D is 150cm, the height H of native case 10For 100cm, soil body thickness t is 30~80cm, collapse the diameter d of cylinder 7 for 10~
50cm, the diameter a of water tank 2 is 80cm, and the height b of water tank 2 is 100cm.
Above-mentioned underground water leakage induces the application method of the experimental rig of surface collapse, comprises the following steps：
Firstth, operating condition of test is drafted, soil body type, soil body severe is drafted, soil body compactness, soil body thickness, to collapse cylinder 7 straight
Footpath, the water pressure of water tank 2；
Secondth, experiment process, the soil body drafted is filled in the inner chamber of native case 1, then water is filled into water tank 2 first,
Start surface collapse monitor 9 and negative pressure test sensor 4, then drawn water by water pump 3 to the water pressure of water tank 2 and reach what is drafted
The water pressure of water tank 2, Study on Soil Collapse situation is monitored by surface collapse monitor 9, and testing the test of sensor 4 by negative pressure collapses cylinder
7 chamber pressures, and pass through the deformation sign that the native side standing motionless as if facing a wall of case 1 examines the soil body；
3rd, test data is analyzed, completes to draft the content of the test under operating condition of test according to experiment process, to test data
Analyzed, disclose formation and Evolution that underground water landing under operating condition of test induces surface collapse disaster.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (5)
1. a kind of underground water leakage induces the experimental rig of surface collapse, it is characterised in that including native case, below native case
The cylinder that collapses of water tank, connection water tank and native case, native case is stretched into the upper end for collapsing cylinder makes to collapse the interior of the inner chamber of cylinder and soil case
Chamber connect, it is described collapse cylinder stretch into native case one end be provided with soil body screen pack, water tank is stretched into the lower end for collapsing cylinder to be made to collapse
Cylinder inner chamber connect with the inner chamber of water tank, it is described collapse cylinder stretch into water tank one end be provided be used for test collapse tube inner chamber pressure
Negative pressure tests sensor, and the side wall of the water tank is provided with valve and one water pump of connection, for testing the water pressure in water tank, institute
State the surface collapse monitor being provided with native case for monitoring Study on Soil Collapse.
2. underground water leakage according to claim 1 induces the experimental rig of surface collapse, it is characterised in that the soil
Case, water tank and collapse cylinder and be made of clear material.
3. underground water leakage according to claim 1 induces the experimental rig of surface collapse, it is characterised in that the native case
It is cylindrical with water tank.
4. underground water according to claim 3 leakage induces the experimental rig of surface collapse, it is characterised in that native case it is straight
Footpath is 150cm, and the height of native case is 100cm, and soil body thickness is 30~80cm, collapses a diameter of 10~50cm of cylinder, water tank
A diameter of 80cm, a height of 100cm of water tank.
5. the underground water leakage described in a kind of any one of Claims 1-4 induces the application method of the experimental rig of surface collapse,
It is characterised in that it includes following steps：
Firstth, operating condition of test is drafted, soil body type, soil body severe is drafted, soil body compactness, soil body thickness, collapses a diameter, water
Case water pressure；
Secondth, experiment process, fills the soil body drafted in the inner chamber of native case first, and water is then filled into water tank, starts ground
Face Collapse monitor instrument and negative pressure test sensor, then reach the water tank hydraulic pressure drafted by pumping for water pump to water tank water pressure
Power, Study on Soil Collapse situation is monitored by surface collapse monitor, and testing sensor test by negative pressure collapses tube inner chamber pressure, and
The deformation sign of the soil body is examined through native case side standing motionless as if facing a wall；
3rd, test data is analyzed, completes to draft the content of the test under operating condition of test according to experiment process, test data is carried out
Analysis.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108241049A (en) * | 2017-12-29 | 2018-07-03 | 河海大学 | The simulation monitoring system and its application method of a kind of multiple depot surface collapse situation |
| CN110044710A (en) * | 2019-05-09 | 2019-07-23 | 中国科学院武汉岩土力学研究所 | Soil cave collapse experiment simulator under a kind of precipitation funnel |
| CN110133220A (en) * | 2019-05-15 | 2019-08-16 | 枣庄学院 | For testing the experimental rig of mud-rock flow erosion negative pressure |
| CN110133221A (en) * | 2019-05-15 | 2019-08-16 | 枣庄学院 | For simulating the experimental rig of cavern's negative pressure |
| CN111103418A (en) * | 2019-12-18 | 2020-05-05 | 山东大学 | Simulation test system and test method for ground settlement caused by extraction of confined water |
| CN112946778A (en) * | 2021-01-29 | 2021-06-11 | 中国地质科学院岩溶地质研究所 | Method for early warning karst collapse based on underground water turbidity monitoring |
| CN114518292A (en) * | 2022-02-18 | 2022-05-20 | 西南交通大学 | Model test device and test method for high-speed railway roadbed of inclined crossing karez |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202870079U (en) * | 2012-09-04 | 2013-04-10 | 中铁二院工程集团有限责任公司 | Fracture-opening-variable multi-effect coupling critical collapse experimental research device |
| CN103645297A (en) * | 2013-12-13 | 2014-03-19 | 中国神华能源股份有限公司 | Simulation device for karst collapses |
| CN104897878A (en) * | 2015-06-16 | 2015-09-09 | 中国地质科学院岩溶地质研究所 | Water-level fluctuation control device for karst collapse test and karst collapse testing device |
| CN105572319A (en) * | 2015-12-11 | 2016-05-11 | 河海大学 | Hydraulic-induced covered karst collapse simulation testing device and using method |
| CN205246649U (en) * | 2015-12-22 | 2016-05-18 | 重庆工程职业技术学院 | Karst analogue means that sinks |
| CN106018736A (en) * | 2016-05-10 | 2016-10-12 | 北京工业大学 | Device for testing surface collapse caused by urban underground pipeline leakage |
-
2017
- 2017-06-30 CN CN201710519420.4A patent/CN107238693A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202870079U (en) * | 2012-09-04 | 2013-04-10 | 中铁二院工程集团有限责任公司 | Fracture-opening-variable multi-effect coupling critical collapse experimental research device |
| CN103645297A (en) * | 2013-12-13 | 2014-03-19 | 中国神华能源股份有限公司 | Simulation device for karst collapses |
| CN104897878A (en) * | 2015-06-16 | 2015-09-09 | 中国地质科学院岩溶地质研究所 | Water-level fluctuation control device for karst collapse test and karst collapse testing device |
| CN105572319A (en) * | 2015-12-11 | 2016-05-11 | 河海大学 | Hydraulic-induced covered karst collapse simulation testing device and using method |
| CN205246649U (en) * | 2015-12-22 | 2016-05-18 | 重庆工程职业技术学院 | Karst analogue means that sinks |
| CN106018736A (en) * | 2016-05-10 | 2016-10-12 | 北京工业大学 | Device for testing surface collapse caused by urban underground pipeline leakage |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108241049A (en) * | 2017-12-29 | 2018-07-03 | 河海大学 | The simulation monitoring system and its application method of a kind of multiple depot surface collapse situation |
| CN110044710A (en) * | 2019-05-09 | 2019-07-23 | 中国科学院武汉岩土力学研究所 | Soil cave collapse experiment simulator under a kind of precipitation funnel |
| CN110044710B (en) * | 2019-05-09 | 2024-01-12 | 中国科学院武汉岩土力学研究所 | Test simulation device for subsidence of soil hole under precipitation funnel |
| CN110133220A (en) * | 2019-05-15 | 2019-08-16 | 枣庄学院 | For testing the experimental rig of mud-rock flow erosion negative pressure |
| CN110133221A (en) * | 2019-05-15 | 2019-08-16 | 枣庄学院 | For simulating the experimental rig of cavern's negative pressure |
| CN110133220B (en) * | 2019-05-15 | 2021-11-23 | 枣庄学院 | Test device for testing erosion negative pressure of debris flow |
| CN111103418A (en) * | 2019-12-18 | 2020-05-05 | 山东大学 | Simulation test system and test method for ground settlement caused by extraction of confined water |
| CN111103418B (en) * | 2019-12-18 | 2022-03-25 | 山东大学 | Simulation test system and test method for ground settlement caused by extraction of confined water |
| CN112946778A (en) * | 2021-01-29 | 2021-06-11 | 中国地质科学院岩溶地质研究所 | Method for early warning karst collapse based on underground water turbidity monitoring |
| CN112946778B (en) * | 2021-01-29 | 2022-05-03 | 中国地质科学院岩溶地质研究所 | Method for early warning karst collapse based on underground water turbidity monitoring |
| CN114518292A (en) * | 2022-02-18 | 2022-05-20 | 西南交通大学 | Model test device and test method for high-speed railway roadbed of inclined crossing karez |
| CN114518292B (en) * | 2022-02-18 | 2023-09-22 | 西南交通大学 | Model test device and test method for high-speed railway roadbed of inclined-span campaigns |
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Application publication date: 20171010 |