CN103675238A - Multifunctional rainfall landslide indoor testing device - Google Patents
Multifunctional rainfall landslide indoor testing device Download PDFInfo
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- CN103675238A CN103675238A CN201310733070.3A CN201310733070A CN103675238A CN 103675238 A CN103675238 A CN 103675238A CN 201310733070 A CN201310733070 A CN 201310733070A CN 103675238 A CN103675238 A CN 103675238A
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Abstract
The invention discloses a multifunctional rainfall landslide indoor testing device, which includes a tempered glass model casing, and a metal frame mounted on the wall of the tempered glass model casing and increasing the strength of the casing body of the model casing, wherein a plurality rows of moisture sensor mounting holes and porewater pressure sensor mounting holes are symmetrically distributed in the two sides of the tempered glass model casing; moisture sensors and porewater pressure sensors are mounted on the moisture sensor mounting holes and the porewater pressure sensor mounting holes respectively; a metal base plate is used as the bottom of the tempered glass model casing; drain holes are formed in the bottom of a front door of the tempered glass model casing, and a filter screen is arranged at the drain holes to prevent the drain holes from being blocked by washed soil samples; a rainfall simulation system is arranged at a top cover of the tempered glass model casing. The multifunctional rainfall landslide indoor testing device is simple in structure, can be used for conducting rainfall induced deformation and landslide tests of different slope models as well as various soil-water characteristic curve tests during the drying and humidification of unsaturated soil, and is high in reliability and precision.
Description
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 unsaturated soil mechanics 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, disaster that have or even destructive.Rainfall is one of principal element of induced landslide, and particularly heavy showers is very easily brought out large volume landslide, serious threat people's life and property safety.And still insufficient to Rainfall landslide understanding and understanding at present, 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 subject to conventionally that equipment is buried underground, site condition and human factor etc. affect, uneconomical and waste time and energy.Rainfall landslide simulation laboratory test is the important tool that discloses Rainfall landslide mechanism and rule, can observe intuitively the process of deformation and failure of side slope, and the research of coming down for Rainfall provides the firsthand information.
At present, rainfall Landslide Model apparatus function is more single both at home and abroad, most of devices cannot simultaneous observation rainfall in inside soil body volumetric water content and pore water pressure 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 is dry and the test of the soil-water characteristic curve of slaking process.Testing efficiency is high, the indoor electricity testing device that can effectively solve that existing instrument test result is single, the multi-functional rainfall of the unsettled problem of test result is come down.
The object of the present invention is achieved like this:
The present invention is multi-functional 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 respectively moisture transducer mounting hole, on pore water pressure sensor mounting hole, tempered glass model casing bottom is metal base plate, there is osculum bottom, tempered glass model casing Qianmen filter screen is set at osculum place washes away obstruction osculum to prevent soil sample, the top cover of tempered glass model casing is provided with rainfall simulation system.
In above-mentioned rainfall simulation plan system, there are aqueduct, flusher and rainfall control system, can regulate and control rainfall amount size by rainfall control system.
On above-mentioned aqueduct, there is Water supply switch valve valve.
Above-mentioned moisture transducer and pore water pressure sensor with can carry out analyzing and processing and correspondingly show that the data acquisition system (DAS) of tested soil sample internal volume water cut and pore water pressure is connected, data acquisition system (DAS) buyable detection signal.
On above-mentioned metal base plate, be bolted metab, to guarantee 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 done respectively water-impervious and processed.
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 done respectively water-impervious and processed.
On above-mentioned tempered glass model casing sidewall, there is coordinate grid, in the test of rainfall landslide, can take coordinate grid as reference, accurately observe slope deformation destruction process, record size and the position of slip surface of deflection.
There is water discharging valve at the osculum place of the bottom, Qianmen of above-mentioned tempered glass model casing.
In above-mentioned device, be furnished with evaporating dish, when measuring the soil-water characteristic curve of dry run, be used for measuring evaporation capacity.
The present invention's step when carrying out the test of rainfall landslide with native water characteristic curve test is as follows:
1. be first ready for the soil for test of making side slope model, according to the dry density of controlling and placement in layers thickness, pre-estimate the soil amount needing.
2. open Qianmen, according to the side slope model of test design, progressively banket, fill in process and should make each sensor fully contact with the soil body and fill in reality, guarantee the corresponding data of the Measurement accuracy soil body.For the homogenieity of maintenance slope body as much as possible, fill and answer placement in layers, successively compacting.
3. complete after the filling of model, shut Qianmen, open water discharging valve, according to test design rainfall amount, open water supply valve switch, by regulating rainfall control system to regulate, control rainfall, start rain test.In rainfall, can pass through the deformation and failure situation of the coordinate grid observational record side slope of tempered glass model casing sidewall.Because moisture transducer, pore water pressure sensor and data acquisition system (DAS) can be tested the variation of the volumetric water content of tested inside soil body and pore water pressure in real time, finally can obtain volumetric water content according to the data that record
θ ω i and pore water pressure
u wi .
4. draw the native water characteristic curve of slaking process: according to experimental test result, and the model of sensor, specification, calculate 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 native 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 with evaporating dish, be used for measuring evaporation capacity under same environment.By moisture transducer and pore water pressure sensor, obtain the volumetric water content of the soil body
θ ω i and pore water pressure
u wi thereby, obtain the soil-water characteristic curve of tested soil sample dry run in a certain evaporation capacity situation.
Finally obtain native water characteristic curve schematic diagram dry and slaking process.
The present invention is suitable for the test of the soil-water characteristic curve of the test of rainfall landslide and unsaturated soil, has following advantage:
1. easy to operate, multiple functional, testing efficiency is high, can effectively solve existing instrument test result 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, the stability and the precision that improve test reduce manual record workload simultaneously.
3. tempered glass case sidewall is symmetrically distributed with many row pressures power installation of sensors 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. on tempered glass model casing sidewall, having coordinate grid, in the test of rainfall landslide, can coordinate grid be reference, accurately observes slope deformation destruction process, records size and the position of slip surface of deflection.
5. the present invention can also carry out separately the test of the dry and humidifying soil-water characteristic curve of unsaturated soil, only need soil sample layering to be laid in chamber, according to previous experiments step, regulate rainfall amount to carry out the test of slaking process, take off top cover and naturally dry by soil sample the test of carrying out dry run, finally can obtain soil-water characteristic curve dry and slaking process, simple to operate, testing efficiency is high.
accompanying drawing explanation:
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 multi-functional rainfall of the present embodiment landslide laboratory testing rig, comprises tempered glass model casing 1, is contained in the metal framework 2 that improves casing intensity on tempered glass model casing.On many rows pore water pressure sensor mounting hole 3-1 that tempered glass model casing 1 symmetria bilateralis arranges, moisture transducer mounting hole 3-2, be separately installed with pore water pressure sensor 4 and moisture transducer 5.Tempered glass model casing bottom is metal base plate 6.Tempered glass model casing 1 front portion is not airtight, Qianmen 7 is set.As Figure 1 and Figure 4, osculum 8 is arranged at 7 bottoms, Qianmen, and filter screen 9 is set at osculum 8 places to prevent soil sample, washes away obstruction osculum, 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, can regulate and control rainfall amount size by rainfall control system 13.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 with can carry out analyzing and processing and correspondingly show that the data acquisition system (DAS) 14 of tested soil sample internal volume water cut and pore water pressure is connected detection signal.As shown in Figure 1, tempered glass model casing bottom arranges metab 20, and metab 20 and metal framework 2 all pass through bolt 18 and be connected its stability of assurance with metal base plate.Top cover 10 is connected with casing 1 by bolt 19, prevents top cover 10 dislocation slippages.The mounting hole 3-1,3-2 of described tempered glass model casing 1 sidewall access sensor, and metal base plate 6 and tempered glass model casing 1 stitching portion are all done water-impervious and are processed.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 take coordinate grid 17 as reference, accurately observes slope deformation destruction process, records size and the position of slip surface of deflection.As shown in Figure 1, osculum 8 places of 7 bottoms, Qianmen are also provided with water discharging valve 15.In device, be also furnished with evaporating dish 16 as shown in Figure 6, when obtaining the soil-water characteristic curve of dry run, be used for measuring evaporation capacity.
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 that foregoing of the present invention is further described, but this should be interpreted as to the scope of the above-mentioned theme of the present invention only limits to above-described embodiment.All technology realizing based on foregoing all belong to scope of the present invention.
Claims (10)
1. multi-functional 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 respectively moisture transducer mounting hole, on pore water pressure sensor mounting hole, tempered glass model casing bottom is metal base plate, there is osculum bottom, tempered glass model casing Qianmen filter screen is set at osculum place washes away obstruction osculum to prevent soil sample, on the top cover of tempered glass model casing, there is rainfall simulation system.
2. multi-functional rainfall according to claim 1 landslide laboratory testing rig, is characterized in that having aqueduct, flusher and rainfall control system in rainfall simulation system, can be regulated and be controlled rainfall amount size by rainfall control system.
3. multi-functional rainfall according to claim 2 landslide laboratory testing rig, is characterized in that on aqueduct, there is Water supply switch valve valve.
4. according to the multi-functional rainfall landslide laboratory testing rig described in claim 1 or 2 or 3, it is characterized in that moisture transducer and pore water pressure sensor and can carry out to detection signal that analyzing and processing is also corresponding show that the data acquisition system (DAS) of tested soil sample internal volume water cut and pore water pressure is connected.
5. according to the multi-functional rainfall landslide laboratory testing rig described in claim 1 or 2 or 3, it is characterized in that being bolted metab on tempered glass simulation box metal base plate.
6. according to the multi-functional rainfall landslide laboratory testing rig described in claim 1 or 2 or 3, it is characterized in that top cover is connected with casing by bolt, prevent top cover dislocation slippage.
7. according to the multi-functional rainfall landslide laboratory testing rig described in claim 1 or 2 or 3, it 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 respectively water-impervious and process.
8. according to the multi-functional rainfall landslide laboratory testing rig described in claim 1 or 2 or 3, it is characterized in that tempered glass model casing sidewall is provided with coordinate grid, in the test of rainfall landslide, can take coordinate grid as reference, accurately observe slope deformation destruction process, record size and the position of slip surface of deflection.
9. according to the multi-functional rainfall landslide laboratory testing rig described in claim 1 or 2 or 3, it is characterized in that there is water discharging valve at the osculum place of bottom, Qianmen.
10. according to the multi-functional rainfall landslide laboratory testing rig described in claim 1 or 2 or 3, it is characterized in that being furnished with evaporating dish in device, when measuring the soil-water characteristic curve of dry run, be used for measuring evaporation capacity.
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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 |
| CN104751725A (en) * | 2015-04-21 | 2015-07-01 | 河海大学 | Side slope landslide teaching demonstration device and experiment method |
| 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 |
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