CN109932300B - Self-starting negative pressure drainage test device - Google Patents
Self-starting negative pressure drainage test device Download PDFInfo
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- CN109932300B CN109932300B CN201910234771.XA CN201910234771A CN109932300B CN 109932300 B CN109932300 B CN 109932300B CN 201910234771 A CN201910234771 A CN 201910234771A CN 109932300 B CN109932300 B CN 109932300B
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- 238000012360 testing method Methods 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 123
- 239000002689 soil Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims description 10
- 229920001971 elastomer Polymers 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 9
- 238000001556 precipitation Methods 0.000 abstract description 8
- 239000007921 spray Substances 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 description 6
- 239000003673 groundwater Substances 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000003809 water extraction Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The application provides a self-starting negative pressure drainage test device which comprises a model box, an upper water outlet, a lower water outlet, a mud-proof sieve plate, a water outlet pipe, transparent fine water pipes, a spray head, a top cover and an adjustable water spraying device, wherein the model box is provided with the lower water outlet and the upper water outlet, two mud-proof sieve plates are arranged between the upper water outlet and the lower water outlet, the mud-proof sieve plate is sealed with the inner wall of the model box, a test soil body is placed between the two mud-proof sieve plates, the top cover and the spray head are arranged at the top of the model box, a plurality of water outlet holes are arranged at different heights of the model box, one side of the water outlet hole is connected with the transparent fine water pipes, and one side of the water outlet hole is connected with the water outlet pipes. The water spraying device can simulate water spraying in the process of precipitation, measure the drainage rate of a water outlet, judge the water pumping quantity at the position of a corresponding cavity body and the size, shape and development of the cavity by observing the change of the liquid level of a transparent thin water pipe in a certain time, and can make the functional relation between the drainage rate of a tested negative pressure self-starting drain pipe and the precipitation rate.
Description
Technical Field
The application belongs to the field of geotechnical engineering, and relates to a side slope self-starting negative pressure drainage test device which is suitable for cavity analysis measurement of a negative pressure area of side slope self-starting negative pressure drainage, analysis of a simulated natural environment self-starting drainage interval, quantitative qualitative determination of influence of factors such as sand sample permeability coefficient, rainfall interval and the like on the size of the side slope self-starting negative pressure drainage negative pressure area.
Background
A large amount of landslide is induced by rising of the groundwater level of the slope body due to rainfall infiltration. The rising of the water level under the sloping field is an accumulation process of rainfall infiltration, continuous and effective drainage measures are adopted to drain the groundwater which enters the permeable sloping field in real time, so that a large number of landslide disasters can be reduced.
The main drainage measures of the current side slope are as follows: surface drainage ditches, drainage blind ditches, water collection wells, horizontal drainage holes, underground drainage holes and the like. The effectiveness of surface drainage measures such as surface drainage ditches, drainage blind ditches and the like is difficult to ensure; the water collection well is pumped by power and frequent management, so that the energy consumption is high and the use cost is high; the horizontal drain hole is easy to be blocked in the natural drain process due to small inclination angle, so that the long-term effectiveness of the drain measures is affected; the underground drainage tunnel has long construction period, complex process and high cost. The slope negative pressure self-starting drainage system and method are continuous and effective slope groundwater drainage measures, which force surrounding groundwater to enter a negative pressure area rapidly and drain outside the slope by forming drainage negative pressure in the slope. However, the researches on the size of the cavity of the negative pressure area in the drainage process and the drainage condition and effect in the actual rainfall process are still to be studied at present.
Disclosure of Invention
The device can study the pressure change conditions of the negative pressure areas at different positions in the process of self-starting negative pressure drainage on the basis of quantitatively measuring the permeability coefficient of the sand sample, and simultaneously analyze the change conditions of the negative pressure cavity of the negative pressure areas and the change of the effect and various data of slope self-starting negative pressure drainage in the process of simulating natural rainfall.
The technical scheme of the application is as follows: the utility model provides a self-starting negative pressure drainage test device, includes the model case, goes up delivery port, delivery port down, prevents mud sieve, outlet pipe, transparent water pipe, shower nozzle, top cap, adjustable water jet equipment, the bottom of model case set up down the delivery port, the top of model case sets up the delivery port, go up the delivery port and set up two mud sieve that prevent between delivery port and the delivery port down, prevent mud sieve and model incasement wall seal, test soil body is placed between two mud sieve, the model case top sets up the top cap, connect the shower nozzle on the top cap, the shower nozzle is connected with adjustable water jet equipment, the model case different elevation department sets up a plurality of apopores, a plurality of transparent water pipes are connected to one side apopore, a plurality of outlet pipes are connected to the opposite side apopore, mud sieve on set up the hole that permeates water, prevent wrapping up filter material on the mud sieve.
Further, the model box is made of transparent acrylic materials, and a rubber protection pad is placed below the model box.
Further, the transparent thin water pipe is a water indicating pipe for observing the water level at equal intervals.
Further, the water outlet pipe can stretch out and draw back and adjust the length, and stretches into the cavity of the test soil body according to the requirement.
Further, geotextile may be used as the filter material.
Further, the lower water outlet is connected with a water guide pipe, and the water outlet of the water guide pipe is placed in the measuring cylinder.
The specific steps used in the application are as follows:
(1) Placing a model box;
(2) Filling test soil, slowly adjusting an adjustable water spraying device to enable the test soil in the model box to be saturated in water absorption, and filling water into the lower mud-proof sieve plate and the cavity of the model box;
(3) The adjustable water spraying device is adjusted, the water level slightly exceeds the upper water outlet, the upper water head of the test soil body in the model box is kept constant due to the existence of the upper water outlet, and the seepage water of the test soil body is discharged into the measuring cylinder through the lower water outlet;
(4) Measuring the water head difference of an upper water outlet and a lower water outlet according to Darcy's law and Darcy's penetration test, recording the scale reading change of a measuring cylinder in a time period, calculating the drainage rate, and calculating the penetration coefficient of a test soil body;
(5) The adjustable water spraying device is adjusted to continuously simulate rainfall, at the moment, a cavity of a negative pressure area is formed in the test soil due to the difference between the negative pressure drainage rate and the seepage rate, and the drainage rate of a lower water outlet is observed and measured, and the water level of transparent water pipes at different positions within a certain time is measured to judge the water extraction quantity and the cavity size and shape change condition of the cavity of the negative pressure area at different positions of the test soil in the natural environment of continuous rainfall;
(5) Adjusting the adjustable water spraying device, performing interval simulation precipitation in a period of time, observing and measuring the water discharging rate of the lower water outlet and measuring the water level rise and fall of transparent water pipes at different positions in a period of time, so as to judge the water pumping quantity at the cavity positions and the change condition and development of the cavity size and shape of the negative pressure area at different positions of the test soil body in the natural environment of interval precipitation;
(6) And (3) placing different types of test soil bodies, and measuring the drain rate change of the negative pressure self-starting drain pipe and the cavity change condition of the negative pressure region of the test soil bodies with different soil textures and different permeability coefficients under different rainfall environments.
The beneficial effects of the application are as follows:
1. the application is to measure the permeability coefficient K of the test soil in the model box by regulating and controlling the flow parameters of the adjustable water spraying device and through Darcy's law and Darcy's permeability test method.
2. The application can spray water in the process of simulating precipitation, measure the drainage rate of the drainage outlet, and judge the water quantity pumped away by the position of the corresponding cavity body, the size, shape and development of the cavity formation by observing the change of the liquid level of the transparent thin water pipe in a certain time.
3. The application measures the drainage rate through the drainage amount, and can make the functional relation between the drainage rate and the precipitation rate of the tested negative pressure self-starting drain pipe.
4. According to the application, through the design of the mud-proof sieve plate, the influence of soil body sediment loss on experiments is prevented, the accuracy of drainage rate measurement is ensured, and the operation is more accurate and reliable.
Drawings
FIG. 1 is a schematic view of the overall structure of the present application;
FIG. 2 is a side view of the present application;
FIG. 3 is a partial schematic view of a mud guard;
in the figure, a model box 1, an upper water outlet 2, a lower water outlet 3, a mud-proof sieve plate 4, a water outlet pipe 5, a transparent thin water pipe 6, a spray head 7, a top cover 8, an adjustable water spraying device 9, a water permeable hole 10, a filtering material 11, a rubber protection pad 12, a measuring cylinder 13 and a test soil body 14.
Detailed Description
The application is further described below with reference to the drawings and examples.
The application will be further illustrated with reference to specific examples. It should be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Example 1
As shown in figures 1-3, the self-starting negative pressure drainage test device comprises a model box 1, an upper water outlet 2, a lower water outlet 3, a mud-proof sieve plate 4, a water outlet pipe 5, a transparent fine water pipe 6, a spray head 7, a top cover 8 and an adjustable water spraying device 9, wherein the lower water outlet 3 is arranged at the bottom of the model box 1, the upper water outlet 2 is arranged at the top of the model box 1, two mud-proof sieve plates 4 are arranged between the upper water outlet 2 and the lower water outlet 3, the mud-proof sieve plate 4 is sealed with the inner wall of the model box 1, a test soil body 14 is placed between the two mud-proof sieve plates 4, the top of the model box 1 is provided with the top cover 8, the spray head 8 is connected with the spray head 7, the spray head 7 is connected with the adjustable water spraying device 9, a plurality of water outlets are arranged at different elevations of the model box 1, one side water outlets are connected with the transparent fine water pipe 6, the other side water outlets are connected with the water outlet pipe 5, the mud-proof sieve plate 4 is provided with the water-permeable hole 10, and the filtering material 11 is wrapped on the mud-proof sieve plate 4.
The model box 1 is made of transparent acrylic material, and a rubber protection pad 12 is placed below the model box 1. The transparent thin water pipe 6 is a water indicating pipe for observing the water level at equal intervals. The water outlet pipe 5 can be stretched and adjusted in length, and stretches into the cavity of the test soil body 14 according to the requirement. Geotextile is used as the filter material 11. The lower water outlet 3 is connected with a water guide pipe, and the water outlet of the water guide pipe is placed in the measuring cylinder 13.
The specific steps used in the application are as follows:
(1) Placing a model box 1;
(2) Filling test soil 14, slowly adjusting the adjustable water spraying device 9 to enable the test soil in the model box 1 to be saturated in water absorption, and filling water into the lower mud-proof sieve plate and the cavity of the model box;
(3) The adjustable water spraying device 9 is adjusted, the water level slightly exceeds the upper water outlet 2, the upper water head of the test soil body 14 in the model box 1 is kept constant due to the upper water outlet 2, and the seepage water of the test soil body 14 is discharged into the measuring cylinder 13 through the lower water outlet 3;
(4) According to Darcy's law and Darcy's penetration test, measuring the water head difference between the upper and lower water outlets, recording the scale reading change of the measuring cylinder in time period, calculating the drainage rate, and calculating the penetration coefficient of the test soil body 14;
(5) The adjustable water spraying device 9 is adjusted to continuously simulate rainfall, at the moment, a cavity of a negative pressure area is formed in the test soil body 14 due to the difference between the negative pressure drainage rate and the seepage rate of the test soil body 14, and the drainage rate of the lower water outlet 3 is observed and measured, and the water level of the transparent water pipe 6 at different positions within a certain time is measured to judge the water extraction quantity and the cavity size and shape change condition of the cavity position of the negative pressure area at different positions of the test soil body 14 in the natural environment of continuous rainfall;
(5) The adjustable water spraying device 9 is adjusted to simulate precipitation at intervals within a period of time, the drainage rate of the lower water outlet 3 is observed and measured, and the water level of transparent water pipes 6 at different positions within a certain period of time is measured to judge the water extraction quantity at the cavity positions and the change condition and development of the cavity size and shape of the negative pressure area at different positions of the test soil body in the natural environment of the interval precipitation;
(6) And placing different types of test soil bodies 14, and measuring the drain rate change of the negative pressure self-starting drain pipe and the cavity change condition of the negative pressure region of the test soil bodies 14 with different soil textures and different permeability coefficients under different rainfall environments.
Claims (6)
1. The utility model provides a self-starting negative pressure drainage test device, its characterized in that, include the model case, go up delivery port, delivery port down, prevent mud sieve, outlet pipe, transparent fine water pipe, shower nozzle, top cap, adjustable water jet equipment, the bottom of model case set up down the delivery port, the top of model case sets up the delivery port, go up the delivery port and set up two mud sieve that prevent between delivery port and the delivery port down, it is sealed with model incasement wall to prevent mud sieve, test soil body is placed between two mud sieve, model case top sets up the top cap, connect the shower nozzle on the top cap, the shower nozzle is connected with adjustable water jet equipment, model case different co-altitude department sets up a plurality of apopores, a plurality of transparent fine water pipes are connected to one side apopore, a plurality of outlet pipes are connected to the opposite side apopore, mud sieve on set up the apopore, parcel filter material on the mud sieve.
2. The self-starting negative pressure drainage test device according to claim 1, wherein the model box is made of transparent acrylic material, and a rubber protection pad is placed below the model box.
3. The self-starting negative pressure drainage test device according to claim 1, wherein the transparent thin water pipe is a water indicating pipe for observing water level at equal intervals.
4. The self-starting negative pressure drainage test device according to claim 1, wherein the water outlet pipe is telescopic and adjustable in length, and stretches into a cavity of a test soil body according to requirements.
5. The self-priming negative pressure drainage test device according to claim 1, wherein the filter material is geotextile.
6. The self-starting negative pressure drainage test device according to claim 1, wherein the lower water outlet is connected with a water guide pipe, and the water outlet of the water guide pipe is placed in a measuring cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910234771.XA CN109932300B (en) | 2019-03-26 | 2019-03-26 | Self-starting negative pressure drainage test device |
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| CN201910234771.XA CN109932300B (en) | 2019-03-26 | 2019-03-26 | Self-starting negative pressure drainage test device |
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| CN109932300A CN109932300A (en) | 2019-06-25 |
| CN109932300B true CN109932300B (en) | 2023-11-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06322772A (en) * | 1993-05-13 | 1994-11-22 | Nitsusaku:Kk | Drainage method in landslide area or the like |
| CN105178343A (en) * | 2015-08-12 | 2015-12-23 | 三峡大学 | Device for conducting siphon drainage by means of drainage ditch |
| CN205643343U (en) * | 2016-05-31 | 2016-10-12 | 成都理工大学 | Indoor test model case in multi -functional landslide |
| CN107246019A (en) * | 2017-06-30 | 2017-10-13 | 浙江大学 | A kind of slope underground water drilling self-starting drainage by suction system and method |
| CN208255017U (en) * | 2018-03-23 | 2018-12-18 | 深圳宏业基岩土科技股份有限公司 | Soil body hydraulic gradient model experimental rig |
| CN209802933U (en) * | 2019-03-26 | 2019-12-17 | 浙江大学 | Self-starting negative pressure drainage test device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074927A (en) * | 2013-02-04 | 2013-05-01 | 厦门瑞尔特卫浴科技股份有限公司 | Drainage accelerating device |
-
2019
- 2019-03-26 CN CN201910234771.XA patent/CN109932300B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06322772A (en) * | 1993-05-13 | 1994-11-22 | Nitsusaku:Kk | Drainage method in landslide area or the like |
| CN105178343A (en) * | 2015-08-12 | 2015-12-23 | 三峡大学 | Device for conducting siphon drainage by means of drainage ditch |
| CN205643343U (en) * | 2016-05-31 | 2016-10-12 | 成都理工大学 | Indoor test model case in multi -functional landslide |
| CN107246019A (en) * | 2017-06-30 | 2017-10-13 | 浙江大学 | A kind of slope underground water drilling self-starting drainage by suction system and method |
| WO2019000776A1 (en) * | 2017-06-30 | 2019-01-03 | 浙江大学 | Side slope underground water drilling self-starting negative pressure drainage system and method |
| CN208255017U (en) * | 2018-03-23 | 2018-12-18 | 深圳宏业基岩土科技股份有限公司 | Soil body hydraulic gradient model experimental rig |
| CN209802933U (en) * | 2019-03-26 | 2019-12-17 | 浙江大学 | Self-starting negative pressure drainage test device |
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