CN103675238B - Multifunctional rainfall landslide laboratory testing rig - Google Patents

Multifunctional rainfall landslide laboratory testing rig Download PDF

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Publication number
CN103675238B
CN103675238B CN201310733070.3A CN201310733070A CN103675238B CN 103675238 B CN103675238 B CN 103675238B CN 201310733070 A CN201310733070 A CN 201310733070A CN 103675238 B CN103675238 B CN 103675238B
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China
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casing
tempered glass
rainfall
mounting hole
landslide
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CN201310733070.3A
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CN103675238A (en
Inventor
吴礼舟
许强
黄润秋
李滨锷
李海亮
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Chengdu Univeristy of Technology
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Chengdu Univeristy of Technology
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Abstract

The invention discloses a kind of Multifunctional rainfall landslide laboratory testing rig, comprise tempered glass model casing, be contained in the metal framework of the raising model casing casing intensity on tempered glass model tank wall, tempered glass model casing symmetria bilateralis is distributed with many drainings sub sensor mounting hole, pore water pressure sensor mounting hole, moisture transducer, pore water pressure sensor is contained in moisture transducer mounting hole respectively, on pore water pressure sensor mounting hole, it is metal base plate bottom tempered glass model casing, there is osculum bottom tempered glass model casing Qianmen and filter screen is set at osculum place and wash away blocking osculum to prevent soil sample, the top cover of tempered glass model casing is provided with rainfall simulation system.Simple structure of the present invention, distortion and landslide test are brought out in the rainfall carrying out different side slope model, and the multiple test such as soil-water characteristic curve test in the drying of unsaturated soil and slaking process, have high fiduciary level and precision.

Description

Multifunctional rainfall landslide laboratory testing rig
technical field:
The invention belongs to technical field of civil engineering, the soil test case that particularly soil-water characteristic curve of rainfall landslide and unsaturated soil is relevant, for the test of rainfall landslide and the unsaturated soils theory soil-water characteristic curve testing research in Geotechnical Engineering field.
background technology:
Landslide is a kind of serious geologic hazard, brings about great losses usually to industrial and agricultural production and people's lives, that have or even destructive disaster.Rainfall is one of principal element of induced landslide, particularly heavy showers, very easily brings out large volume landslide, serious threat people's life and property safety.And at present rain-induced landslide be familiar with and understand still insufficient, under further investigation condition of raining, instability of deposit body rule has important theory significance and engineering practical value to Prediction and Forecast of Landslide with preventing and reducing natural disasters.And field monitoring is buried underground by equipment usually, site condition and human factor etc. affect, uneconomical and waste time and energy.Rainfall landslide simulation laboratory test is the important tool disclosing rain-induced landslide mechanism and rule, can observe the process of deformation and failure of side slope intuitively, for the research of rain-induced landslide provides the firsthand information.
At present, domestic and international rainfall Landslide Model apparatus function is more single, most of device cannot in simultaneous observation rainfall inside soil body volumetric water content and pore water pressure force value over time, the cost of suction sensor is large, also cannot obtain the corresponding soil-water characteristic curve of the soil body.
summary of the invention:
The object of the invention is, in order to provide a kind of easy to operate, multiple functional, be suitable for rainfall and bring out slope deforming and process of landslides test, and unsaturated soil to be dry and the test of the soil―structure interaction of slaking process.Testing efficiency is high, and the Multifunctional rainfall that effectively can solve the problem that existing instrument test result is single, test result is unstable comes down indoor electricity testing device.
The object of the present invention is achieved like this:
The present invention is Multifunctional rainfall landslide laboratory testing rig, comprise tempered glass model casing, be contained in the metal framework of the raising model casing casing intensity on tempered glass model tank wall, tempered glass model casing symmetria bilateralis is distributed with many drainings sub sensor mounting hole, pore water pressure sensor mounting hole, moisture transducer, pore water pressure sensor is contained in moisture transducer mounting hole respectively, on pore water pressure sensor mounting hole, it is metal base plate bottom tempered glass model casing, there is osculum bottom tempered glass model casing Qianmen and filter screen is set at osculum place and wash away blocking osculum to prevent soil sample, the top cover of tempered glass model casing is provided with rainfall simulation system.
Aqueduct, flusher and rainfall control system is had, by rainfall control system regulable control rainfall amount size in above-mentioned rainfall simulation plan system.
Above-mentioned aqueduct there is Water supply switch valve valve.
Above-mentioned moisture transducer and pore water pressure sensor to can carry out analyzing and processing to detection signal and correspondingly show that tested soil sample internal volume water cut is connected with the data acquisition system (DAS) of pore water pressure, data acquisition system (DAS) buyable.
Above-mentioned metal base plate is bolted metab, to ensure the stability of tempered glass simulation box.
Above-mentioned tempered glass model casing top cover is connected with casing by bolt, prevents top cover dislocation slippage.
Above-mentioned tempered glass model casing sidewall moisture transducer mounting hole, pore water pressure sensor mounting hole, metal base plate and tempered glass model casing stitching portion do water-impervious process respectively.
Above-mentioned tempered glass model casing sidewall moisture transducer mounting hole, pore water pressure sensor mounting hole, metal base plate and tempered glass model casing stitching portion do water-impervious process respectively.
Above-mentioned tempered glass model casing sidewall has coordinate grid, in the test of rainfall landslide, can take coordinate grid as reference, accurately observation slope deformation destruction process, the size of record deflection and position of slip surface.
There is water discharging valve at osculum place bottom the Qianmen of above-mentioned tempered glass model casing.
Evaporating dish is furnished with, when measuring the soil―structure interaction of dry run for measuring evaporation capacity in above-mentioned device.
The present invention's step when carrying out the test of rainfall landslide and testing with soil-water characteristic curve is as follows:
1. be first ready for the test soil making side slope model, pre-estimate the soil amount of needs according to the dry density controlled and placement in layers thickness.
2. open Qianmen, the side slope model according to test design progressively bankets, and fills in process and each sensor and the soil body should be made fully to contact and fill in real, guarantees the corresponding data of the Measurement accuracy soil body.In order to the homogenieity of maintenance slope body as much as possible, fill and answer placement in layers, successively tamp.
3. after completing the filling of model, shutting Qianmen, open water discharging valve, according to test design rainfall amount, open water supply valve switch, by regulating rainfall control system regulable control rainfall, starting rain test.By the deformation and failure situation of the coordinate grid observational record side slope of tempered glass model casing sidewall in rainfall.Because moisture transducer, pore water pressure sensor and data acquisition system (DAS) can be tested the volumetric water content of tested inside soil body and the change of pore water pressure in real time, finally volumetric water content can be obtained according to the data recorded θ ω i and pore water pressure u wi .
4. draw the soil-water characteristic curve of slaking process: according to experimental test result, and the model of sensor, specification, calculating corresponding matric suction, take matric suction as horizontal ordinate, volumetric water content is ordinate, draws the soil-water characteristic curve of tested soil sample slaking process.
5. obtain the soil-water characteristic curve of dry run: stop rainfall, when osculum no longer includes water discharge, close water discharging valve, close Water supply switch valve valve, take off top cover, allow soil sample naturally dry, carry out the test of the soil-water characteristic curve of dry run, and under same environment with evaporating dish for measuring evaporation capacity.The volumetric water content of the soil body is obtained by moisture transducer and pore water pressure sensor θ ω i and pore water pressure u wi , thus the soil―structure interaction of tested soil sample dry run under obtaining a certain evaporation capacity situation.
Finally obtain soil-water characteristic curve schematic diagram that is dry and slaking process.
The present invention is suitable for the test of the soil―structure interaction of the test of rainfall landslide and unsaturated soil, has following advantage:
1. easy to operate, multiple functional, testing efficiency is high, effectively can solve that existing instrument test result is single, the unstable coarse problem of test result.
2. by moisture transducer and pore water pressure sensor, the volumetric water content in the tested soil body and pore water pressure are detected in real time, detection signal is sent to acquisition system simultaneously, obtain real-time dynamic volumetric water content and pore water pressure force data, improve stability and the precision of test, reduce manual record workload simultaneously.
3. tempered glass case sidewall symmetry is distributed with many row pressures force snesor mounting hole moisture transducer mounting hole and accesses moisture transducer and pore water pressure sensor, can meet the rainfall landslide test of differing heights and different gradient side slope model.
4. tempered glass model casing sidewall having coordinate grid, in the test of rainfall landslide, can coordinate grid be reference, accurately observation slope deformation destruction process, the size of record deflection and position of slip surface.
5. the present invention can also carry out separately the drying of unsaturated soil and the test of humidifying soil-water characteristic curve, soil sample layering is only needed to be laid in chamber, according to previous experiments step, rainfall amount is regulated to carry out the test of slaking process, take off top cover and naturally dry the test carrying out dry run by soil sample, finally can obtain soil―structure interaction that is dry and slaking process, simple to operate, testing efficiency is high.
accompanying drawing illustrates:
Fig. 1 is front view of the present invention.
Fig. 2 is the A-A cut-open view in Fig. 1.
Fig. 3 is the B-B cut-open view in Fig. 1.
Fig. 4 is tempered glass model casing front door structure schematic diagram.
Fig. 5 is tempered glass model casing cap structure schematic diagram.
Fig. 6 is tempered glass model casing evaporation structure schematic diagram.
Fig. 7 is coordinate grid partial schematic diagram of the present invention.
Fig. 8 is landslide of the present invention test simulation schematic diagram.
Fig. 9 is dry and slaking process soil-water characteristic curve figure.
Referring to Fig. 1 ~ Fig. 8, the present embodiment Multifunctional rainfall landslide laboratory testing rig, comprises tempered glass model casing 1, is contained in the metal framework 2 tempered glass model casing improving casing intensity.Many rows pore water pressure sensor mounting hole 3-1 that tempered glass model casing 1 symmetria bilateralis is arranged, moisture transducer mounting hole 3-2 are separately installed with pore water pressure sensor 4 and moisture transducer 5.It is metal base plate 6 bottom tempered glass model casing.Tempered glass model casing 1 front portion is not airtight, arrange Qianmen 7.As Figure 1 and Figure 4, osculum 8 is had bottom Qianmen 7, and filter screen 9 is set at osculum 8 place washes away blocking osculum to prevent soil sample, as shown in Figure 1, shown in Figure 5, the top cover 10 of tempered glass model casing is provided with rainfall simulation system, comprise aqueduct 11, flusher 12 and rainfall control system 13, by rainfall control system 13 regulable control rainfall amount size.Aqueduct 11 in rainfall control system is also provided with Water supply switch valve valve 21.As shown in Figure 2, moisture transducer 4 and pore water pressure sensor 5 to can carry out analyzing and processing to detection signal and correspondingly show that tested soil sample internal volume water cut is connected with the data acquisition system (DAS) 14 of pore water pressure.As shown in Figure 1, arrange metab 20 bottom tempered glass model casing, metab 20 and metal framework 2 all pass through bolt 18 and are connected with metal base plate and ensure its stability.Top cover 10 is connected with casing 1 by bolt 19, prevents top cover 10 to misplace slippage.The mounting hole 3-1,3-2 of described tempered glass model casing 1 sidewall access sensor, and water-impervious process is all done in metal base plate 6 and tempered glass model casing 1 stitching portion.As shown in Fig. 1, Fig. 7, Fig. 8, tempered glass model casing 1 sidewall is provided with coordinate grid 17, in the test of rainfall landslide, can with coordinate grid 17 for reference, and accurately observation slope deformation destruction process, the size of record deflection and position of slip surface.As shown in Figure 1, osculum 8 place bottom Qianmen 7 is also provided with water discharging valve 15.Evaporating dish 16 as shown in Figure 6 is also furnished with, when obtaining the soil-water characteristic curve of dry run for measuring evaporation capacity in device.
Fig. 8 is landslide of the present invention test simulation schematic diagram.In figure, sequence number 22 is slight slope Mathematical Model of heaped-up.
Fig. 9 is dry and slaking process soil-water characteristic curve figure.
Above-described embodiment is further described foregoing of the present invention, but this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to above-described embodiment.All technology realized based on foregoing all belong to scope of the present invention.

Claims (8)

1. Multifunctional rainfall landslide laboratory testing rig, it is characterized in that comprising tempered glass model casing, be contained in the metal framework of the raising casing intensity on tempered glass model tank wall, tempered glass model casing symmetria bilateralis is distributed with many drainings sub sensor mounting hole, pore water pressure sensor mounting hole, moisture transducer, pore water pressure sensor is contained in moisture transducer mounting hole respectively, on pore water pressure sensor mounting hole, it is metal base plate bottom tempered glass model casing, there is osculum bottom tempered glass model casing Qianmen and filter screen is set at osculum place and wash away blocking osculum to prevent soil sample, the top cover of tempered glass model casing there is rainfall simulation system, tempered glass model casing sidewall is provided with coordinate grid, in the test of rainfall landslide, can take coordinate grid as reference, accurate observation slope deformation destruction process, the size of record deflection and position of slip surface, evaporating dish is furnished with in device, when measuring the soil-water characteristic curve of dry run for measuring evaporation capacity.
2. Multifunctional rainfall landslide according to claim 1 laboratory testing rig, is characterized in that having aqueduct, flusher and rainfall control system in rainfall simulation system, by rainfall control system regulable control rainfall amount size.
3. Multifunctional rainfall landslide according to claim 2 laboratory testing rig, is characterized in that aqueduct there is Water supply switch valve valve.
4. the Multifunctional rainfall landslide laboratory testing rig according to claim 1 or 2 or 3, is characterized in that moisture transducer and pore water pressure sensor and can carry out analyzing and processing to detection signal and correspondingly show that tested soil sample internal volume water cut is connected with the data acquisition system (DAS) of pore water pressure.
5. the Multifunctional rainfall landslide laboratory testing rig according to claim 1 or 2 or 3, is characterized in that tempered glass simulation box metal base plate has been bolted metab.
6. the Multifunctional rainfall landslide laboratory testing rig according to claim 1 or 2 or 3, is characterized in that top cover is connected with casing by bolt, prevents top cover dislocation slippage.
7. the Multifunctional rainfall landslide laboratory testing rig according to claim 1 or 2 or 3, is characterized in that tempered glass model casing sidewall moisture transducer mounting hole, pore water pressure sensor mounting hole, metal base plate and tempered glass model casing stitching portion do water-impervious process respectively.
8. the Multifunctional rainfall landslide laboratory testing rig according to claim 1 or 2 or 3, is characterized in that there is water discharging valve at the osculum place bottom Qianmen.
CN201310733070.3A 2013-12-27 2013-12-27 Multifunctional rainfall landslide laboratory testing rig Expired - Fee Related CN103675238B (en)

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CN104502563A (en) * 2014-12-22 2015-04-08 泉州师范学院 Rainfall type landslide disaster simulation test system
CN104751725B (en) * 2015-04-21 2018-01-30 河海大学 Slope and land slide teaching demonstration device and test method
CN106198339A (en) * 2015-05-29 2016-12-07 长沙理工大学 A kind of covering layer slope seepage flow characteristics considering rainfall infiltration and stability model
CN105116111A (en) * 2015-08-24 2015-12-02 广西大学 Device and method for measuring influences of rainfall capacity and matrix suction on side slope
CN106018229A (en) * 2016-03-10 2016-10-12 长沙理工大学 Soil body seepage process and deformation characteristic test device and test method
CN107144523B (en) * 2017-05-17 2019-12-03 上海理工大学 A kind of side slope experimental rig of simulated rainfall change in time and space
CN108981578B (en) * 2018-06-26 2019-11-12 中国地质大学(武汉) The simulated experiment mechanism of rainfall induction slope displacement
CN110456025A (en) * 2019-07-31 2019-11-15 河海大学 The test device and test method of soil body olistostrome degree are mixed under a kind of hydrodynamism

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