CN218233412U - Water and rock-soil physicochemical damage test device - Google Patents
Water and rock-soil physicochemical damage test device Download PDFInfo
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- CN218233412U CN218233412U CN202120235839.9U CN202120235839U CN218233412U CN 218233412 U CN218233412 U CN 218233412U CN 202120235839 U CN202120235839 U CN 202120235839U CN 218233412 U CN218233412 U CN 218233412U
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Abstract
The utility model discloses a water and rock soil physical and chemical damage test device, which comprises a box body, an upper baffle plate, a lower baffle plate, an upper permeable pad, a lower permeable pad, a water blocking film, an upper pressure head, a water inlet and a water outlet, wherein the water blocking film is arranged in the box body, the top of the water blocking film is communicated with a soil sample placing port, and a closed cavity is enclosed between the water blocking film and the box body; the upper baffle plate and the lower baffle plate are respectively arranged around the outer peripheral surfaces of the upper end and the lower end of the water blocking film, the upper water permeable cushion and the lower water permeable cushion are respectively plugged at the upper end and the lower end of the water blocking film, the water inlet penetrates through the bottom of the box body and is communicated with the lower water permeable cushion, the upper pressure head is used for pressing the upper water permeable cushion to apply downward axial load to a soil sample, the water outlet penetrates through the upper pressure head and is communicated with the upper water permeable cushion, and penetrating fluid enters from the water inlet and flows out from the water outlet. The utility model discloses can realize the simulation of foundation ditch soil layer confined pressure, can study under the different water pressure effects, the compressive strength of the permeability change characteristic of soil layer sample and different soil layer samples under different water pressures is favorable to mastering the road calamity formation law of collapsing.
Description
Technical Field
The utility model relates to a city underground works construction technical field especially relates to a water and ground materialization damage test device.
Background
The construction scale and the number of urban underground engineering (such as pipe networks, municipal tunnels, rail transit and comprehensive pipe gallery engineering) show a sharp trend, are influenced by factors such as multiple disturbance, near excavation, strong rainfall penetration and underground water level change, and underground hidden diseases (such as looseness, water damage and cavities) induce frequent construction disaster accidents, so that serious economic loss and social influence are caused.
In recent years, the research results related to rock-soil body deformation under the action of gas-water-solid coupling are more, and the method relates to the fields of resources, environment, hydraulic and hydroelectric engineering, underground engineering, nuclear waste storage, reservoir induced earthquake and the like. At present, research finds that seepage in pores of rock-soil bodies is an important factor influencing the stability of the rock-soil bodies, wherein more than 90 percent of urban road underground diseases are generated and are related to the seepage force of surface water or underground water vapor, and most of road collapse accidents are caused by water seepage.
In the process of foundation pit construction, the stress condition of a supporting structure and the caused ground settlement degree change along with seepage and precipitation processes, and the complex geological phenomenon and invisibility of complex stratums existing in a geologic body become the difficulty for analyzing the evolution mechanism of damage of underground diseases. In addition, the construction of the foundation pit is affected by various loads in addition to water infiltration. But the research on the movement and collapse characteristics of road disease stratum structures under the action of load-seepage coupling is rarely reported.
Before and during the construction of the foundation pit, the influence of excavation of soft soil bodies on the ground layer and the surrounding environment is researched, and the safety of the combined tunnel construction penetrating through the existing building and the smoothness of the ground traffic road are favorably ensured. By researching the change mechanism of the interaction of water and rock-soil mass on the mechanical property of the roadbed rock-soil mass, the formation rule of the road collapse disaster is mastered, and the advanced forecasting and advanced treatment of the road collapse disaster are of far-reaching significance.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of prior art existence, the utility model provides a water and ground materialization damage test device can simulate water and ground materialization process in the foundation ditch work progress under the different water environment, through simulation foundation ditch soil layer confined pressure and axial water pressure, under the different water pressure of research effect, the permeability change characteristic of soil layer sample to reason and research water and ground body interact are to the change mechanism of roadbed rock soil body mechanical properties, grasp the calamity formation law that sinks of road.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a water and rock-soil physicochemical damage test device comprises a box body filled with liquid, an upper baffle plate, a lower baffle plate, an upper water permeable cushion, a lower water permeable cushion, a water blocking film, an upper pressure head, a water inlet and a water outlet, wherein the upper baffle plate and the lower baffle plate are spaced from each other; the upper baffle plate is arranged on the outer peripheral surface of the upper end of the water-blocking film in a surrounding manner, the lower baffle plate is arranged on the outer peripheral surface of the lower end of the water-blocking film in a surrounding manner, and the upper baffle plate and the lower baffle plate are opposite to each other and extend towards each other to keep a longitudinal interval; go up the pad of permeating water with permeate water down the pad and block up respectively in the upper and lower both ends of water blocking film, the water inlet runs through bottom half and communicates permeate water down the pad, go up the pressure head and be used for compressing tightly go up the pad of permeating water and exert axial load down to the soil sample, the delivery port runs through go up the pressure head and communicate the pad of permeating water, the penetrant is followed the water inlet gets into, follows the delivery port flows.
As one embodiment, the water and rock-soil physical and chemical damage test device further comprises a shearing device, wherein the shearing device is arranged in the box body and comprises a transverse pressure head and a cylinder body which drives the transverse pressure head to be close to and far away from the water blocking film, and the transverse pressure head is over against the longitudinal interval between the upper baffle and the lower baffle.
As one embodiment, the inner surfaces of the upper baffle and the lower baffle are both provided with a sealing ring, and the upper baffle and the lower baffle are respectively contacted with the water blocking film through the sealing rings.
As one embodiment, the box body is provided with a pressurizing opening and a pressure relief opening, and the surrounding pressure environment around the water blocking film can be simulated by changing the pressure difference between the pressurizing opening and the pressure relief opening.
As one embodiment, the water and rock physical and chemical damage test device further comprises a temperature control device, wherein the temperature control device is arranged on the water inlet and is used for controlling the temperature of penetrating fluid entering the soil sample.
As one embodiment, the water and rock-soil physical and chemical damage test device further comprises a PH meter, wherein the PH meter is arranged on the water outlet and used for detecting the PH value of overflowed penetrating fluid.
As one embodiment, the water and rock physical and chemical damage test device further comprises a surging device arranged in the box body, wherein the surging device is arranged on one side of the box body and is used for pushing liquid of the box body to surge towards the water blocking film.
In one embodiment, the surge device is a turbine.
As one embodiment, the water and rock-soil physical and chemical damage test device further comprises a device and a support plate, wherein the support plate is fixed at the bottom of the box body and used for bearing the box body to rotate, and the device is arranged outside the box body and used for scanning the internal structure of a soil sample in the rotation process of the support plate.
The utility model discloses a water and ground materialization damage test device can provide confined pressure, the infiltration hydraulic pressure of simulation for the soil sample, realizes the simulation of foundation ditch soil layer confined pressure, under the different water pressure effect of research, the permeability of soil layer sample changes the characteristic, through applying the axial load of equidimension not to the soil sample in the testing process, can research the compressive strength of different soil layer samples under different water pressure, collapse the calamity formation law to master the road to it has profound meaning with administering in advance.
Drawings
Fig. 1 is the utility model discloses a water and ground materialization damage test device's of embodiment structural schematic diagram.
Detailed Description
In the present invention, the terms "set", "provided" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like, are used in an orientation or positional relationship indicated in the drawings for convenience in describing the application and for simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the application.
Some of the above terms may be used to indicate other meanings in addition to orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of dependency or connection relationship in some cases. The specific meaning of these terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an embodiment of the utility model provides a water and ground materialization damage test device, including the box 1 that is full of liquid, the upper baffle 2 and the lower baffle 3 of mutual interval, go up permeable mat 4 and lower permeable mat 5, water-blocking membrane 6, last pressure head 8, water inlet I and delivery port O, the mouth of putting into of soil sample T is seted up at the top of box 1, water-blocking membrane 6 encloses to be the tube-shape, vertically locate in box 1 and the top communicates with putting into the mouth, enclose into confined cavity with between the box 1; the upper baffle 2 is arranged around the outer peripheral surface of the upper end of the water-blocking film 6, the lower baffle 3 is arranged around the outer peripheral surface of the lower end of the water-blocking film 6, and the upper baffle 2 and the lower baffle 3 are opposite and extend towards each other to keep a longitudinal interval; go up the pad 4 and permeate water down and fill up 5 and block in the upper and lower both ends of water-blocking membrane 6 respectively, water inlet I runs through the box 1 bottom and communicates the pad 5 that permeates water down, goes up pressure head 8 and is used for compressing tightly the pad 4 that permeates water on and exert downward axial load to soil sample T, and delivery port O runs through pressure head 8 and communicates the pad 4 that permeates water on, and the penetrant gets into from water inlet I, flows from delivery port O.
The water-blocking film 6 is made of a material for preventing liquid from permeating, so that experimental errors caused by the fact that liquid in the box body 1 enters the soil sample T can be avoided. After the soil sample T is placed into the water blocking film 6 from the placing opening in the top of the box body 1, a cavity formed between the box body 1 and the water blocking film 6 is filled with liquid, and the liquid has lateral pressure on the soil sample T in the water blocking film 6, so that confining pressure on the soil sample T can be simulated. Optionally, the box body 1 may further have a pressure port 1a and a pressure relief port 1b, and the lateral pressure of the liquid on the water-blocking film 6 may be changed by changing the pressure difference between the pressure port 1a and the pressure relief port 1b, so as to simulate different confining pressure environments around the water-blocking film 6 according to the actual environment of the foundation pit.
In some embodiments, the water blocking film 6 may be coated on the outer circumferential surface of the soil sample T, and then placed in the inlet, and then the box 1 may be filled with the liquid, without fixing the water blocking film 6 in the box 1.
The upper baffle 2 and the lower baffle 3 can be respectively fixed on the inner surfaces of the top surface and the bottom surface of the box body 1 to form a cylindrical body matched with the appearance and the size of the water-blocking film 6, for example, when the soil sample T is a square cylinder, the upper baffle 2 and the lower baffle 3 are both square, and when the soil sample T is a cylinder, the upper baffle 2 and the lower baffle 3 are both circular. After the soil sample T is placed in, the upper baffle plate 2 and the lower baffle plate 3 are respectively sealed with the upper end and the lower end of the water-blocking film 6, so that a closed liquid injection environment is formed between the periphery of the water-blocking film 6 and the inner wall of the box body 1. The upper baffle 2 and the lower baffle 3 can also be used for limiting the upper end and the lower end fixing positions of the soil sample T so as to facilitate the soil sample T to carry out the next stress test.
In order to guarantee the sealing performance between the water blocking film 6 and the box body 1, the inner surfaces of the upper baffle 2 and the lower baffle 3 are respectively provided with a sealing ring 31, the upper baffle 2 and the lower baffle 3 are respectively in contact with the water blocking film 6 through the sealing rings 31, and therefore liquid can be prevented from overflowing from the gap between the upper baffle 2, the lower baffle 3 and the water blocking film 6 to influence confining pressure parameters.
The water inlet I of box 1 bottom can also be provided with temperature control device 10, through setting up temperature control device 10 on water inlet I, can real time monitoring through water inlet I's liquid temperature to the temperature of the penetrant in the control entering soil sample T is favorable to the influence of analysis temperature of intaking to soil sample atress characteristic.
The delivery port O at the top of the box body 1 can also be provided with a PH meter 12, and the PH meter 12 is arranged on the delivery port O, so that the liquid temperature passing through the delivery port O can be monitored in real time, and the PH value of overflowed penetrating fluid can be detected. The pH value of the overflow liquid at the water gap O is detected by introducing different penetrating liquids from the water inlet I at the bottom, the ion leaching condition after the chemical action of the soil sample water can be analyzed, and the influence of different water qualities on the structural balance of the rock and soil mass is found out.
The box body 1 can be further internally provided with a shearing device 9, the shearing device 9 comprises a transverse pressure head and a cylinder body for driving the transverse pressure head to be close to and far away from the water blocking film 6, and the transverse pressure head is over against the longitudinal interval between the upper baffle 2 and the lower baffle 3. The upper baffle 2 and the lower baffle 3 can be used as transverse limiting structures at two ends of the soil sample T, and when a transverse pressure head of the shearing device 9 applies pressure to the middle of the soil sample T from the side part, the pressure is adjusted until the soil sample is broken, so that the shear strength of the soil sample can be analyzed.
The water and rock soil physical and chemical damage test device can further comprise a CT (computer Tomography) device C and a support plate 7, wherein the support plate 7 is fixed at the bottom of the box body 1 and used for supporting the box body 1 to rotate, the CT device C is arranged outside the box body 1 and used for scanning the internal structure of the soil sample T in the rotation process of the support plate 7, visually displaying the distribution condition of the internal pore structure of the soil sample, and displaying the damage degree of the internal part of the soil sample and the evolution process of the pore structure under the action of osmotic pressure.
In addition, the box body 1 can be internally provided with a surging device 11, the surging device 11 is arranged on one side of the box body 1 and can push the liquid of the box body 1 to surmount towards the water blocking film 6, and therefore the transverse stress interference received by the soil sample can be simulated. The surge device 11 may be a turbine fixed to one of the side walls of the tank 1.
In the experimental process, the following operations can be specifically carried out:
(1) Filling a soil sample T;
(2) Filling the box body 1 with water;
(3) Determining actual confining pressure according to the stress environment of a soil layer of a foundation pit site; the pressure of the air pressure/hydraulic pressure of the pressurizing port 1a is adjusted to simulate the confining pressure environment borne by the soil sample T;
(4) Injecting liquid from a water inlet I at the bottom, and analyzing the permeability change condition of the soil sample under different injection pressures; and (3) observing the water pressure permeation path inside the soil sample through the CT device C, rotating the carrier plate 7 in real time, and scanning the internal structure of the soil sample in all directions.
(5) The same soil sample is taken and the change rules of the compressive strength (gradually adjusting the axial pressure), the shear strength (gradually adjusting the transverse pressure) and the elastic modulus (observing the structural change through a CT device) before and after the soil sample is soaked are respectively analyzed.
(6) The axial pressure applied by the upper pressure head 8 is adjusted, the pore structure distribution inside the soil sample is observed through the CT device, and the evolution process of the pore structure along with the change of the axial pressure is analyzed.
(7) The temperature of the permeate was varied, and the above-described detection procedures (4) to (6) were repeated to investigate the influence of the temperature on the test results.
(8) The test procedures (4) to (6) were repeated while changing the permeate composition, and the influence of the permeate composition on the test results was investigated.
(9) And (4) replacing the soil sample, repeating the detection processes from (4) to (6), soaking the soil sample for a preset time (such as 48 hours), and analyzing the pH value of the overflowing liquid to obtain the influence of different penetrating fluid types on the structure balance of the soil sample.
The utility model discloses a water and ground materialization damage test device can provide confined pressure, the infiltration hydraulic pressure of simulation for the soil sample, realize the simulation of foundation ditch soil layer confined pressure, under the different water pressure effect of research, the permeability of soil layer sample changes the characteristic, through applying the axial load of equidimension not to the soil sample in the testing process, can research the compressive strength of different soil layer samples under different water pressures, collapse the calamity to mastering the road and form the law, and advance the forecast and administer in advance to it and have profound meaning, avoid the occurence of failure. Meanwhile, the water and rock physical and chemical damage test device of the utility model can also analyze the influence of different temperatures, penetrating fluid components and soil sample PH on the compressive strength, the shearing strength and the elastic modulus of the soil sample in the water and rock physical and chemical process, so as to reveal the water physical and chemical damage mechanism of the rock-soil body by analyzing the physical phenomenon and the chemical phenomenon which cause the reduction of the geotechnical engineering performance; based on the characteristic rules of underground construction disturbance hydrate migration and soft soil deformation, a common structure crossing excavation danger interval and a precontrol area are defined, and powerful theoretical bases and technical guarantees are provided for underground common structure engineering under-crossing existing key facility construction safety and timeliness control.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (9)
1. The water and rock physical and chemical damage test device is characterized by comprising a box body (1) filled with liquid, an upper baffle (2) and a lower baffle (3) which are spaced from each other, an upper permeable cushion (4) and a lower permeable cushion (5), a water-blocking film (6), an upper pressure head (8), a water inlet (I) and a water outlet (O), wherein the top of the box body (1) is provided with a placing opening of a soil sample (T), the water-blocking film (6) is enclosed into a cylindrical shape, is vertically arranged in the box body (1), is communicated with the placing opening at the top and is enclosed into a closed cavity with the box body (1); the upper baffle (2) is arranged around the outer peripheral surface of the upper end of the water-blocking film (6), the lower baffle (3) is arranged around the outer peripheral surface of the lower end of the water-blocking film (6), and the upper baffle (2) and the lower baffle (3) are opposite to each other and extend towards each other to keep longitudinal intervals; go up and pass through water pad (4) with pass through down water pad (5) shutoff respectively in the upper and lower both ends of water blocking film (6), water inlet (I) run through box (1) bottom and intercommunication permeate water pad (5) down, it is used for compressing tightly to go up pressure head (8) and pass through water pad (4) and exert axial load down to soil sample (T) go up, delivery port (O) runs through go up pressure head (8) and communicate and go up and pass through water pad (4), the penetrant is followed water inlet (I) gets into, follows delivery port (O) flows.
2. The water and rock-soil physicochemical damage test device according to claim 1, further comprising a shearing device (9), wherein the shearing device (9) is arranged in the box body (1) and comprises a transverse pressure head and a cylinder body for driving the transverse pressure head to be close to and far away from the water blocking film (6), and the transverse pressure head is over against the longitudinal interval between the upper baffle (2) and the lower baffle (3).
3. The water and rock-soil physical and chemical damage test device according to claim 2, wherein the inner surfaces of the upper baffle (2) and the lower baffle (3) are provided with sealing rings (31), and the upper baffle (2) and the lower baffle (3) are respectively contacted with the water blocking film (6) through the sealing rings (31).
4. The water and rock-soil physicochemical damage test device according to claim 2, wherein the box body (1) has a pressurization port (1 a) and a pressure relief port (1 b), and the confining pressure environment around the water-blocking film (6) can be simulated by changing the pressure difference between the pressurization port (1 a) and the pressure relief port (1 b).
5. The water and rock physical and chemical damage test device according to claim 2, further comprising a temperature control device (10), wherein the temperature control device (10) is arranged on the water inlet (I) and used for controlling the temperature of penetrating fluid entering the soil sample (T).
6. The water and rock-soil physical and chemical damage test device as claimed in claim 2, further comprising a pH meter (12), wherein the pH meter (12) is arranged on the water outlet (O) and is used for detecting the pH value of overflowed penetrating fluid.
7. The water and rock-soil physical and chemical damage test device according to claim 2, further comprising a surging device (11) arranged in the box body (1), wherein the surging device (11) is arranged on one side of the box body (1) and is used for pushing liquid of the box body (1) to surmount towards the water-blocking film (6).
8. The apparatus for testing physicochemical damage of water and rock-soil according to claim 7, wherein the surging apparatus (11) is a turbine.
9. The test device for physical and chemical damages of water and rock soil according to any one of claims 2 to 8, further comprising a CT device (C) and a carrier plate (7), wherein the carrier plate (7) is fixed at the bottom of the box body (1) and used for carrying the box body (1) to rotate, and the CT device (C) is arranged outside the box body (1) and used for scanning the internal structure of the soil sample (T) in the rotation process of the carrier plate (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120235839.9U CN218233412U (en) | 2021-01-28 | 2021-01-28 | Water and rock-soil physicochemical damage test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120235839.9U CN218233412U (en) | 2021-01-28 | 2021-01-28 | Water and rock-soil physicochemical damage test device |
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| Publication Number | Publication Date |
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| CN218233412U true CN218233412U (en) | 2023-01-06 |
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| CN202120235839.9U Active CN218233412U (en) | 2021-01-28 | 2021-01-28 | Water and rock-soil physicochemical damage test device |
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