AU2021106119A4 - Model testing device and method for unsaturated soil slope instability considering liquid-gas coupling effect - Google Patents
Model testing device and method for unsaturated soil slope instability considering liquid-gas coupling effect Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/027—Investigation of foundation soil in situ before construction work by investigating properties relating to fluids in the soil, e.g. pore-water pressure, permeability
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B11/00—Drainage of soil, e.g. for agricultural purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0092—Visco-elasticity, solidification, curing, cross-linking degree, vulcanisation or strength properties of semi-solid materials
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Abstract
This invention discloses a model testing device and method for unsaturated soil slope
instability, where liquid-gas coupling effects are considered. The model device consists of a
high-strength glass seal box, a water spraying system, an air pressure control component, and
a data acquisition component. Specifically, the glass seal box, filled with a model soil slope,
has an openable upper cover with interfaces for installing various pipelines. The water spraying
system comprises a water tank, a micro submersible pump, and a network pipe type atomizing
nozzle that is connected by pipelines. In addition, the air pressure control component is
connected with the seal box and comprises a miniature air pump with a digital display; the air
pressure in the cabin is controlled by the air pump. Data acquisition components include
barometer and saturation ratio testing sensor TDR. The designed device can be utilized to
simulate the instability response and active failure processes of slopes affected by the rich
interplay between liquid and gas provided by spraying water and controlling air pressure, and
thus is featured by convenient operation, simple structure, and accurate control.
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Description
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Figure 2
Model testing device and method for unsaturated soil slope instability
considering liquid-gas coupling effect
The invention relates to a geotechnical engineering model test device and
method, in particular to a model testing device and method for unsaturated soil slope
instability under the condition of water-gas pressure change. The test can be
conducted in conventional gravity field or centrifugal gravity field. The following is a
description of the centrifugal model field.
In the field of geological disaster prevention and control, slope stability
evaluation and prevention are often challenges faced by scientists and engineers in
emergency rescue and disaster relief. In the field of building and transportation
facilities, slope stability analysis and control are essential to ensure the safety of
engineering construction. At present, the analysis of slope stability is mainly
implemented from the perspective of single-phase mediums. For most slopes, due to
the influence of rainfall infiltration and water vapor evaporation, the environment in
which the slope is located is often in a dynamic state. Therefore, in slope stability
analysis, the rich interplay between pore fluid and granular soil in two-phase mediums
should be considered, thus pave to the consideration of coupling effects in soil-water
gas three-phase mediums for geo-engineerings related to unsaturated soil and high
pressure gas (e.g, aerogenesis and natural gas hydrate dissolution in landfills).
Because of the complex interaction between three-phase media, the mechanical
properties of soil vary greatly. Besides, the instability mechanism is significantly
different from that of single-phase and two-phase saturated media. Therefore, it is necessary to discuss the instability mechanisms of soil in complex water-gas environments.
In recent years, scientists and engineers have made great progress in the study of
the mechanical properties of unsaturated soil. Full-field numerical and analytical
analyses used for stability research, however, are usually implemented based on
classical soil mechanics theory, where experimental verification lacks. Geotechnical
centrifuge test technology is a technology that uses a centrifugal testing machine to
generate centrifugal acceleration, where the working state of unsaturated soil can be
reproduced by reducing the sample size. In order to consider the unstable state of
unsaturated soil under the liquid-air coupling, it is necessary to gain the ability to
artificially control water and air pressure. At present, a centrifugal model device for
slope stability that can control water and air pressure at the same time has not been
developed.
In order to overcome the shortcomings in the background technology, the
purpose of the present invention is to provide a model testing device and method for
modeling unsaturated soil slope instability considering liquid-gas coupling effects.
To this end, the technical scheme of the present invention is as follows: The
invention relates to a model testing device and method for unsaturated soil slope
instability considering liquid-gas coupling effect. The model box is placed on the
basket of centrifugal testing machine. The front side of the model box is provided
with a glass window (with opening) with no top cover, and the interior is provided
with a high-strength glass seal box, a water spraying system, an air pressure control
component, and a data acquisition component. The seal box has an upper cover for opening and a joint for connection, and the box is filled with a slope for test. The water spraying system comprises a water tank, a miniature submersible pump, a water stop valve, a network pipe, and an atomizing nozzle. The network pipe and the atomizing nozzle are arranged in a seal chamber and connected with the submersible pump arranged in the water tank through a joint on the upper cover of the seal box.
The air pressure control component comprises a pipeline, a gas pressure reducing
valve, a miniature air compressor, and a ball valve. The compressor is vertically
arranged in the baffle space, which is connected with the interface of the upper cover
of the seal chamber. The air pressure in the seal chamber is controlled by an inflator
that can output air pressure controllably, while the data acquisition component
includes an air pressure gauge and a saturation ratio TDR testing sensor. The air
pressure gauge is fixed in the seal chamber, and the saturation ratio TDR testing
sensor is placed inside the slope to measure the saturation inside the soil.
Both the air compressor and submersible pump are connected with motor
controllable switches, which can control the operation and stop of the inflator and the
submersible pump.
The seal chamber inside the centrifugal model is connected with the water tank
and the air pressure control system through pipelines. Baffles are used to separate and
fix these components.
There are also monitoring components outside the model, including brackets,
LED illumination lamps, and cameras.
The invention has the following advantages:
1. The air pressure control system is connected with the seal box through a
pipeline, and the high-pressure air in the air compressor passes through a controllable
pressure reducing valve to quantitatively control the air pressure in the seal chamber.
In this way, the air pressure value can be selected according to the actual situation to
set the test scheme. As result, the unstable state of soil in different periods and under
different air pressures can be well reproduced.
2. The water spraying system adopts pipe network design.The distributed
multiple atomizing nozzles can ensure the uniformity of water spraying, and can
control the water spraying amount when the submersible pump is turned on and off,
thus controlling the soil saturation of the test slope.
3. Both the barometer and saturation ratio testing sensor TDR can measure the
air pressure and saturation data in real time, to monitor the soil state during the test.
4. All parts of the device are fixed to bear the action of high gravity field. Both
the micro compressor and the micro submersible pump are driven by electric power
and connected with the power supply of centrifuge, which is convenient to use.
5. The front side of centrifuge model box is made of plexiglass, and the seal
chamber is also made of transparent material. The change of soil state can be clearly
observed through the monitoring system, indicating a high visualization degree. The
image information collected by the monitoring system can completely record soil
state variations during the experiment.
The following is a further detailed description of the present invention with
reference to the drawings and embodiments:
Fig. 1 is a schematic diagram of a model box structure;
Fig. 2 is a cross-sectional view of fig. 1 A-A;
Fig. 3 is a cross-sectional view of fig. 1B-B.
In the figure, 1 is the model box, 2 is the miniature air compressor, 3 is the gas
pressure reducing valve, 4 is the ball valve 1, 5 is the micro submersible pump, 6 is the ball valve 2, 7 is the water tank, 8 is the network pipeline, 9 is the atomizing nozzle, 10 is the seal box, 11 is the precision barometer, and 12 is the baffle.
The invention relates to a model testing device and method for unsaturated soil
slope instability considering liquid-gas coupling effect, which are illustrated in Figure
1. The whole device is placed in the model box 1, and the upper part of the model box
1 is opened to facilitate the assembly and debugging of various components of the
device. The front side is inlaid with a piece of plexiglass to facilitate the observation
of the internal soil, and is installed in the hanging basket of a centrifuge during the
test. The model box is internally provided with a high-strength glass seal box 10, a
water spraying system, an air pressure control component and a data acquisition
component.
Fig. 2 shows the pressure system, which includes the miniature air compressor 2,
ball valve 4, pressure reducing valve 3 and related pipelines; the air compressor 2 is
fixed in a space formed by a baffle 12; the air compressor 2 provides high-pressure air
and can inflate the seal box 10 through pipelines. One end of the air compressor 2 is
connected with the power control cabinet of the centrifuge to realize the opening and
closing of the compressor 2. The air outlet is connected with the seal box 10 through
pipelines, and the ball valve 4 and the pressure reducing valve 3 are connected in
series inside the pipelines. Manual operation of the ball valve 4 can realize the
opening and closing of the air inlet pipeline, and the pressure reducing valve 3 can
adjust the air pressure of the over-flow gas to realize the control of the air pressure in
the sealed box 10.
Fig. 3 shows the water spraying system, which mainly includes the water tank 7,
submersible pump 5, network pipe 8, atomizing nozzle 9 and a pipeline system. The submersible pump 5 is placed inside the water tank 7. The water tank 7 is placed in the space adjacent to the baffle 12 of the compressor 2; one end of the submersible pump 5 is connected with the power supply of the power centrifuge to control the startup and shutdown of the submersible pump 5, and the other end is connected with the inner pipe 8 in the seal box 10 through a pipeline. The submersible pump 5 is started to pump the water in the water tank 7 into the pipeline, and the net pipe 8 shunts the water coming from the submersible pump 5 and connects three pipes in parallel. Each pipe is closed at the end of the pipe and connected with three atomizing nozzles 9 in series. Nine atomizing nozzles 9 are uniformly arranged. The ball valves
6 are connected in series in the pipes, which can control the water in the water tank to
enter the seal box 10. The water spraying system sprays water evenly inside the seal
box 10 by opening the submersible pump 5 and the ball valves 6 to improve the soil
saturation. Seal box 10 is fixed inside model box 1 in the figure, which is made of
glass, filled with slope, and changes the internal soil conveniently and intuitively.
Precision barometer 11 is installed inside the box, and the air pressure inside the seal
box can be monitored in real time by recording the readings of precision barometer 11.
TDR sensor is embedded inside the slope to obtain the soil saturation value.
A monitoring system is arranged outside the model box, which is fixed on the
front side of the model box with a glass window by a bracket. An LED lamp
illumination and a camera are installed on the bracket to record the change of soil
when the centrifuge runs.
The assembly operation process of the model testing device and method for
unsaturated soil slope instability considering liquid-gas coupling effect is completed
by the following steps:
First, the model soil prepared in a certain proportion is filled into the seal box
according to a certain slope angle, and several saturators should be distributed inside
the soil and buried inside the soil. Clean the glass of the model box 1 and the seal box
to achieve good visibility. Add water to the water tank 7 to a proper water level, so
as to ensure that all components in the model tank 1 are normally connected and fixed.
Secondly, the manufactured model box 1 is placed and fixed on the basket of the
centrifuge by using a crane, and is reasonably weighted. Then, connect the power
supply of submersible pump 5 and air compressor 2 to the power supply of centrifuge.
Turn on the surveillance system.
Thirdly, the ball valve 6 of the water spraying system pipeline is opened, and the
switch of the submersible pump 5 is turned on, so that the saturation of soil in the seal
box 10 increases continuously. After a period, the power supply is turned off, the
water spraying in the seal box 10 is stopped, and the ball valve 6 is closed. The longer
the time, the higher the saturation of soil. The saturation should be controlled
according to the time required by the experimental scheme.
Fourthly, wait for the soil to stabilize after spraying water, adjust the pressure
reducing valve 3 of the air pressure system according to the air pressure required by
the experimental scheme. Open the ball valve 4 of the air pressure system and open
the air compressor 2, observe the precision barometer 11 in the seal box 10, and wait
for the degree of the air pressure gauge 11 to stabilize.
Fifthly, after ensuring that the system in the model box 1 is normal, start the
centrifuge, set the centrifuge speed constant to reach the acceleration value designed
by the experimental scheme, and wait for the acceleration to be constant. Under the
effects of the centrifuge's high gravity field, the slope becomes unstable, and the monitoring system records the deformation of the slope with time. Stop running the centrifuge.
The specific implementation described in this specification is only an operation
mode for the content of this invention. Because the device of this invention has good
controllability, technicians in related technical fields can easily modify the test
scheme to control the conditions in various environments. The protection scope of this
invention should not be limited to the specific implementation described in this
specification. Equivalent technical methods adopted by relevant technicians based on
the concept of this invention should belong to the protection scope of this invention.
Claims (4)
1. A model testing device and method for unsaturated soil slope instability
considering liquid-gas coupling effect is characterized in that: the model box is placed
on the basket of centrifugal testing machine, the front side of the model box is
provided with an glass window (with opening) with no top cover, and the interior is
provided with a high-strength glass seal box, a water spraying system, an air pressure
control component and a data acquisition component. The seal box has an upper cover
for opening and a joint for connection, and the box is filled with a unsaturated soil
slope for test. The water spraying system comprises a water tank, a miniature
submersible pump, a water stop valve, a network pipe and an atomizing nozzle,
wherein the network pipe and the atomizing nozzle are arranged in a seal chamber and
connected with the submersible pump arranged in the water tank through a joint on
the upper cover of the seal box. The air pressure control component comprises a
pipeline, a gas pressure reducing valve, a miniature air compressor and a ball valve.
The compressor is vertically arranged in the baffle space, which are connected with
the interface of the upper cover of the seal chamber, and the air pressure in the seal
chamber is controlled in real time by an inflator which can output air pressure
controllably. The data acquisition component includes an air pressure gauge and a
TDR sensor probe. The air pressure gauge is fixed in the seal chamber, and the TDR
sensor probe is placed inside the slope to measure the saturation inside the soil.
2. A model testing device and method for unsaturated soil slope instability
considering liquid-gas coupling effect according to claim 1 is characterized in that
both the air compressor and submersible pump are connected with motor controllable
switches, which can control the operation and stop of the inflator and the submersible
pump.
3. The model testing device and method for unsaturated soil slope instability
considering liquid-gas coupling effect according to claim 1 is characterized in that the
seal chamber inside the centrifugal model is connected with the water tank and the air
pressure control system through pipelines, and is separated and fixed with baffles.
4. The model testing device and method for unsaturated soil slope instability
considering liquid-gas coupling effect to claim 1 is characterized in that the model is
also provided with monitoring components outside, including brackets, LED
illumination lamps and cameras.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021106119A AU2021106119A4 (en) | 2021-08-20 | 2021-08-20 | Model testing device and method for unsaturated soil slope instability considering liquid-gas coupling effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021106119A AU2021106119A4 (en) | 2021-08-20 | 2021-08-20 | Model testing device and method for unsaturated soil slope instability considering liquid-gas coupling effect |
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| Publication Number | Publication Date |
|---|---|
| AU2021106119A4 true AU2021106119A4 (en) | 2021-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2021106119A Active AU2021106119A4 (en) | 2021-08-20 | 2021-08-20 | Model testing device and method for unsaturated soil slope instability considering liquid-gas coupling effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740178A (en) * | 2022-03-24 | 2022-07-12 | 胡利航 | Slope internal erosion instability test device |
| CN114740177A (en) * | 2022-03-24 | 2022-07-12 | 胡利航 | Slope instability risk factor simulation test device |
-
2021
- 2021-08-20 AU AU2021106119A patent/AU2021106119A4/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740178A (en) * | 2022-03-24 | 2022-07-12 | 胡利航 | Slope internal erosion instability test device |
| CN114740177A (en) * | 2022-03-24 | 2022-07-12 | 胡利航 | Slope instability risk factor simulation test device |
| CN114740177B (en) * | 2022-03-24 | 2024-02-23 | 胡利航 | Slope instability risk factor simulation test device |
| CN114740178B (en) * | 2022-03-24 | 2024-02-23 | 胡利航 | Slope internal erosion instability test device |
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