Experimental device for impact soft soil area culvert structure substrate stability

Abstract

The utility model provides an experimental device for impacting the stability of a culvert structure substrate in a soft soil area. The experimental device is used for solving the problem that a pore water pressure sensor in the prior art cannot accurately detect the change of pore water pressure in a sample. The experimental platform comprises a first groove which is formed in the experimental platform and is used for accommodating the porous stone; the depth of the first groove is smaller than the height of the permeable stone; a second groove for draining water is annularly formed in the joint of the side wall of the first groove and the groove bottom, and the second groove is connected with a first drain pipe; the pore water pressure sensor is connected with the first drainage pipe; the second groove used for draining water is arranged at the joint of the side wall and the groove bottom of the first groove, on one hand, it is guaranteed that the permeable stone and the groove bottom of the first groove are in surface contact, stress balance of the sample is guaranteed, and on the other hand, it can be guaranteed that water in the sample can smoothly flow out through the permeable stone; therefore, the pore water pressure sensor can accurately detect the pore water pressure change in the sample.

Description

Technical Field

[0001] The utility model belongs to the field of culvert structure base stability experiments, in particular to an experimental device for the base stability of a culvert structure in an impact soft soil area. Background Art

[0002] The culvert structure is an important channel connecting the left and right sides for farming and maintenance. The base treatment of the culvert structure is particularly important during the construction process. However, due to tight construction schedules and management omissions, there is often a phenomenon of only focusing on the main construction of the culvert structure and neglecting the base treatment construction. This leads to varying degrees of settlement of the culvert structure after subsequent traffic operation, requiring a large investment of manpower and material resources, and the quality and effect of the treatment are poor. In particular, culvert structures built on soft soil areas are prone to large deformation under the action of load or their own gravity, resulting in uneven settlement, causing quality risks such as rupture of the culvert structure and cracking of the roadbed and pavement structure layer, posing certain risks to driving safety. Therefore, when designing the culvert structure, it is necessary to conduct stability tests on the base of the culvert structure in order to select the appropriate construction process.

[0003] Conventional testing of culvert foundation stability typically uses a triaxial test setup. This setup applies stresses in three orthogonal directions to the specimen, simulating the stress state it would experience in real-world conditions. During the experiment, permeable stone is placed at the bottom of the specimen, which is then connected to the baseplate via the stone. A drainage pipe, connected to the stone, is installed above the baseplate. This pipe is also connected to a pore water pressure sensor to monitor pore water pressure changes within the specimen in real time.

[0004] Furthermore, because the axial compressive mechanism of the triaxial test apparatus applies a normal load to the specimen during the experiment, the permeable stone also serves as a connector between the specimen and the test platform. Therefore, to ensure balanced normal force on the specimen, the permeable stone and the top of the test platform are typically in surface contact. However, this surface contact prevents water from flowing smoothly through the permeable stone during the experiment, preventing the pore water pressure sensor from accurately detecting changes in pore water pressure within the specimen. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an experimental device for impacting the stability of the base of a culvert structure in a soft soil area, so as to solve the problem that the pore water pressure sensor in the prior art cannot accurately detect the pore water pressure changes inside the sample.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides an experimental device for the stability of the base of a culvert structure in an impact soft soil area, comprising: a pressure chamber, an axial pressure-applying mechanism, a pressure-stabilizing and pressure-regulating mechanism, a permeable stone, a bottom plate, a top plate, a plurality of support columns, a first drainage pipe, a pore water pressure sensor and a detection mechanism; the top plate and the bottom plate are connected by support columns; the axial pressure-applying mechanism is arranged on the top plate; the pressure chamber and the pressure-stabilizing and pressure-regulating mechanism are arranged on the bottom plate; the pressure chamber comprises a first shell and an experimental platform arranged on the bottom plate; the first shell and the experimental platform enclose a holding cavity for accommodating a sample; the experimental platform is provided with a first groove for accommodating the permeable stone; the first The depth of the groove is less than the height of the permeable stone; a second groove for drainage is provided at the connection between the side wall of the first groove and the bottom of the groove, and the second groove is connected to the first drainage pipe; the pore water pressure sensor is connected to the first drainage pipe for detecting the water pressure in the first drainage pipe; the axial pressure mechanism passes through the first shell and is connected to one end of the sample arranged in the accommodating cavity; the end of the sample away from the axial pressure mechanism is connected to the first groove through the permeable stone; the axial pressure mechanism is used to apply normal pressure to the sample; the pressure stabilizing and regulating mechanism is used to apply pressure to the accommodating cavity; the detection mechanism is used to detect the displacement of the axial pressure mechanism and the magnitude of the pressure applied to the accommodating cavity by the pressure stabilizing and regulating mechanism.

[0007] Optionally, a third groove for drainage is further provided at the bottom of the first groove along its radial direction, and both ends of the third groove are respectively connected to the second groove.

[0008] Optionally, a fourth groove for drainage is further provided at the bottom of the first groove along its radial direction, and both ends of the fourth groove are respectively connected to the second groove.

[0009] Optionally, center lines of the third groove and the fourth groove are arranged perpendicular to each other.

[0010] Optionally, the first drain pipe is connected to the second groove through the third groove and the fourth groove.

[0011] Optionally, the voltage stabilizing and regulating mechanism includes a water inlet pipe, a water inlet switch, a second drain pipe and a drain switch; one end of the water inlet pipe passes through the experimental platform and is connected to the accommodating cavity; the other end is connected to the water inlet switch; one end of the second drain pipe passes through the experimental platform and is connected to the accommodating cavity, and the other end is connected to the drain switch.

[0012] Optionally, the axial pressure mechanism includes a cylinder and a transmission member; the cylinder is arranged on the top plate, and the transmission member is connected to the transmission member; a through hole is also provided on the first shell, a sealing member is provided on the inner wall of the through hole, and the transmission member is connected to the inner wall of the through hole through the sealing member.

[0013] Optionally, the detection mechanism includes a pressure detection component, which is arranged in the accommodating cavity and is used to detect the pressure in the accommodating cavity.

[0014] Optionally, the detection mechanism further includes a distance detection member, which is provided on the transmission member and is used to detect the movement distance of the transmission member.

[0015] Optionally, the pressure detecting element is a pressure sensor and / or the distance detecting element is a distance sensor.

[0016] As described above, the experimental device for the base stability of a culvert structure in an impact soft soil area of ​​the utility model has at least the following beneficial effects: by setting the second groove for drainage at the connection between the side wall and the bottom of the first groove, on the one hand, it ensures that the permeable stone and the bottom of the first groove are in surface contact, ensuring the force balance of the sample; on the other hand, it can also ensure that the water in the sample can flow out smoothly through the permeable stone, so that the pore water pressure sensor can accurately detect the pore water pressure changes inside the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a structural schematic diagram of an experimental device for impacting the base stability of a culvert structure in a soft soil area according to the present invention.

[0018] Figure 2 Shown is a partial structural schematic diagram of an experimental device for impacting the base stability of a culvert structure in a soft soil area according to the present invention.

[0019] Figure 3 Shown is a cross-sectional view of the pressure chamber of the present invention.

[0020] Component number description:

[0021] 1. Pressure chamber, 11. First shell, 111. Sealing element, 12. Experimental platform, 121. First groove, 122. Second groove, 123. Third groove, 124. Fourth groove, 2. Axial pressurizing mechanism, 21. Cylinder, 22. Transmission element, 3. Voltage stabilizing and regulating mechanism, 31. Water inlet pipe, 32. Water inlet switch, 33. Second drain pipe, 34. Drain switch, 4. Permeable stone, 5. Bottom plate, 6. Top plate, 7. Support column, 8. First drain pipe, 9. Pore water pressure sensor, 10. Detection mechanism, 101. Pressure detection element, 102. Distance detection element. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0023] Please refer to all the following drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of this utility model. Therefore, they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the efficacy and purpose that can be achieved by this utility model, should still fall within the scope of the technical content disclosed by this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this utility model without substantially changing the technical content.

[0024] The following embodiments are for illustration only and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0025] See also Figure 1-3 The utility model provides an experimental device for the stability of the base of a culvert structure in an impact soft soil area, comprising: a pressure chamber 1, an axial pressure mechanism 2, a pressure stabilizing and regulating mechanism 3, a permeable stone 4, a bottom plate 5, a top plate 6, a plurality of support columns 7, a first drainage pipe 8, a pore water pressure sensor 9 and a detection mechanism 10; the top plate 6 and the bottom plate 5 are connected by the support columns 7; the axial pressure mechanism 2 is arranged on the top plate 6; the pressure chamber 1 and the pressure stabilizing and regulating mechanism 3 are arranged on the bottom plate 5; the pressure chamber 1 includes a first shell 11 and an experimental platform 12 arranged on the bottom plate 5; the first shell 11 and the experimental platform 12 enclose a receiving chamber for receiving a sample; the experimental platform 12 is provided with a first groove 121 for receiving the permeable stone 4; the first groove 121 The depth is less than the height of the permeable stone 4; a second groove 122 for drainage is provided at the connection between the side wall of the first groove 121 and the bottom of the groove, and the second groove 122 is connected to the first drain pipe 8; the pore water pressure sensor 9 is connected to the first drain pipe 8 for detecting the water pressure in the first drain pipe 8; the axial pressurizing mechanism 2 is connected to one end of the sample arranged in the accommodating cavity through the first shell 11; the end of the sample away from the axial pressurizing mechanism 2 is connected to the first groove 121 through the permeable stone 4; the axial pressurizing mechanism 2 is used to apply normal pressure to the sample; the pressure stabilizing and regulating mechanism 3 is used to apply pressure to the accommodating cavity; the detection mechanism 10 is used to detect the displacement of the axial pressurizing mechanism 2 and the magnitude of the pressure applied to the accommodating cavity by the pressure stabilizing and regulating mechanism 3.

[0026] Specifically, the top plate 6 and bottom plate 5 are rectangular mounting structures, with four support columns 7, each located at a corner of the top plate 6 and bottom plate 5, supporting the top plate 6 on the bottom plate 5. The experimental platform 12 can be cylindrical, and the first housing 11 can be a cylindrical structure with a cavity. A sealing structure can be provided at the connection between the first housing 11 and the experimental platform 12 to maintain a seal between the first housing 11 and the experimental platform 12. A first groove 121 is provided on the side of the experimental platform 12 facing away from the bottom plate 5. The first groove 121 can be a circular blind hole. The second groove 122 is provided at the junction of the sidewall and bottom of the first groove 121 and is annular. The depth of the first groove 121 is less than that of the permeable stone 4. This allows one end of the permeable stone 4 to extend outside the first groove 121 after the permeable stone 4 is placed in the first groove 121. This allows the specimen to be secured to the permeable stone 4 via a rubber membrane and a clamp when placed in the chamber. In this embodiment, the sample is a sample of soil or a mixture of soil and rocks from a soft soil area, and may also be a base filler in the soft soil area during construction of a circular structure in the soft soil area.

[0027] During use, after the sample is fixed in the accommodating cavity, the axial pressure-applying mechanism 2 and the pressure-stabilizing and regulating mechanism 3 apply pressure to the sample. After the sample is subjected to pressure, the water in the sample flows into the second groove 122 through the permeable stone 4 and is then discharged using the first drain pipe 8. The pore pressure in the sample is detected using the pore water pressure sensor 9.

[0028] In one embodiment, a third groove 123 for drainage is further provided along the radial direction of the bottom of the first groove 121. Both ends of the third groove 123 are connected to the second groove 122. The provision of the third groove 123 allows water in the middle of the sample to flow out smoothly through the third groove 123, so that the pore water pressure sensor 9 can accurately detect changes in the pore water pressure within the sample.

[0029] A fourth groove 124 for drainage is further provided along the radial direction of the bottom of the first groove 121. Both ends of the fourth groove 124 are connected to the second groove 122. The combined action of the fourth groove 124, the second groove 122, and the third groove 123 allows water in the middle of the sample to flow out smoothly through the fourth groove 124, allowing the pore water pressure sensor 9 to accurately detect changes in the pore water pressure within the sample.

[0030] Specifically, the center lines of the third groove 123 and the fourth groove 124 can be perpendicular to each other. That is, the third groove 123 and the fourth groove 124 are arranged in a cross shape at the bottom of the first groove 121, so that the third groove 123 and the fourth groove 124 collect drainage from different positions of the sample.

[0031] The first drain pipe 8 is connected to the second groove 122 through the third groove 123 and the fourth groove 124. Specifically, the first drain pipe 8 can be set on the center line of the first groove 121 and connected to the intersection of the third groove 123 and the fourth groove 124. When in use, the water in the second groove 122 is collected at the intersection of the third groove 123 and the fourth groove 124 through the third groove 123 or the fourth groove 124, and then discharged using the first drain pipe 8, and the pore pressure is detected using the pore water pressure sensor 9 provided on the first drain pipe 8. In one embodiment, the third groove 123 and the fourth groove 124 are arranged at an angle, specifically, the two ends of the third groove 123 and the two ends of the fourth groove 124 are respectively arranged at an angle toward the intersection of the third groove 123 and the fourth groove 124, so as to facilitate the flow of water into the first drain pipe 8.

[0032] The voltage-stabilizing and regulating mechanism 3 includes a water inlet pipe 31, a water inlet switch 32, a second drain pipe 33, and a drain switch 34. One end of the water inlet pipe 31 passes through the experimental platform 12 and connects to the holding chamber; the other end is connected to the water inlet switch 32. One end of the second drain pipe 33 passes through the experimental platform 12 and connects to the holding chamber, and the other end is connected to the drain switch 34. Specifically, the water inlet pipe 31 can be connected to an external water tank via the water inlet switch 32, and the second drain pipe 33 can be connected to the external water tank via the drain switch 34. During use, by turning on the water inlet switch 32, water from the external water tank flows through the water inlet pipe 31 into the holding chamber, applying a certain amount of water pressure to the specimen in both the circumferential and axial directions. After the experiment is completed, the drain switch 34 can be turned on and off to drain the water in the holding chamber out of the external water tank. It is understood that during the experiment, depending on the different experimental scenarios, the water inlet switch 32 or the drain switch 34 can be selectively turned on or off to increase or decrease the water in the holding chamber, thereby varying the water pressure applied to the specimen and simulating the stress conditions under different scenarios.

[0033] The axial pressure mechanism 2 includes a cylinder 21 and a transmission member 22; the cylinder 21 is arranged on the top plate 6, and the transmission member 22 is connected to the transmission member 22; a through hole is also provided on the first shell 11, and a sealing member 111 is provided on the inner wall of the through hole, and the transmission member 22 is connected to the inner wall of the through hole through the sealing member 111. Specifically, the through hole is provided on the top surface of the first shell 11, and the first through hole can be a cylindrical hole, and the corresponding transmission member 22 can be a cylindrical structure, one end of which is used to connect with the cylinder 21, and the other end is used to connect with the sample; the sealing member 111 can be an O-ring. The provision of the sealing member 111 prevents water in the accommodating chamber from flowing out when the cylinder 21 drives the transmission member 22 to move up and down.

[0034] The detection mechanism 10 includes a pressure detection member 101, which is disposed within the accommodating chamber and is used to detect the pressure within the accommodating chamber. The detection mechanism 10 also includes a distance detection member 102, which is disposed on the transmission member 22 and is used to detect the movement distance of the transmission member 22. The pressure detection member 101 can be a pressure sensor, and the distance detection member 102 can be a distance sensor.

[0035] In summary, the present invention provides a second groove 122 for drainage at the junction of the sidewall and bottom of the first groove 121. This ensures, on the one hand, that the permeable stone 4 and the bottom of the first groove 121 are in surface contact, ensuring force balance on the sample. It also ensures that water within the sample can flow smoothly through the permeable stone 4, allowing the pore water pressure sensor 9 to accurately detect changes in the pore water pressure within the sample. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial value.

[0036] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. An experimental device for impacting the stability of the base of a culvert structure in a soft soil area, characterized in that: The experimental device includes: a pressure chamber, an axial pressure applying mechanism, a pressure stabilizing and regulating mechanism, a permeable stone, a bottom plate, a top plate, a plurality of support columns, a first drain pipe, a pore water pressure sensor and a detection mechanism; The top plate and the bottom plate are connected via the support column; the axial pressure mechanism is arranged on the top plate; The pressure chamber and the voltage stabilizing and regulating mechanism are arranged on the bottom plate; The pressure chamber includes a first shell and an experimental platform provided on the bottom plate; the first shell and the experimental platform enclose a receiving cavity for receiving a sample; The experimental platform is provided with a first groove for accommodating a permeable stone; the depth of the first groove is less than the height of the permeable stone; a second groove for drainage is provided at the junction of the sidewall and the bottom of the first groove, and the second groove is connected to the first drainage pipe; the pore water pressure sensor is connected to the first drainage pipe to detect the water pressure in the first drainage pipe; The axial pressure mechanism is connected to one end of the sample arranged in the accommodating chamber through the first shell; the end of the sample away from the axial pressure mechanism is connected to the first groove through the permeable stone; the axial pressure mechanism is used to apply normal pressure to the sample; the pressure stabilizing and regulating mechanism is used to apply pressure to the accommodating chamber; the detection mechanism is used to detect the displacement of the axial pressure mechanism and the magnitude of the pressure applied to the accommodating chamber by the pressure stabilizing and regulating mechanism.

2. The experimental device for evaluating the stability of a culvert structure in a soft soil area according to claim 1, characterized in that: A third groove for drainage is further provided at the bottom of the first groove along its radial direction, and both ends of the third groove are respectively connected to the second groove.

3. The experimental device for evaluating the stability of a culvert structure in a soft soil area according to claim 2, characterized in that: A fourth groove for drainage is further provided at the bottom of the first groove along its radial direction, and both ends of the fourth groove are respectively connected to the second groove.

4. The experimental device for evaluating the stability of a culvert structure in a soft soil region according to claim 3, characterized in that: Center lines of the third groove and the fourth groove are perpendicular to each other.

5. The experimental device for evaluating the stability of a culvert structure in soft soil according to claim 4, characterized in that: The first drain pipe is connected to the second groove through the third groove and the fourth groove.

6. The experimental device for evaluating the stability of a culvert structure in a soft soil region according to claim 1, characterized in that: The voltage stabilizing and regulating mechanism includes a water inlet pipe, a water inlet switch, a second drain pipe and a drain switch; One end of the water inlet pipe passes through the experimental platform and is connected to the accommodating cavity; the other end is connected to the water inlet switch; One end of the second drain pipe passes through the experimental platform and is connected to the accommodating cavity, and the other end is connected to the drain switch.

7. The experimental device for evaluating the stability of a culvert structure in soft soil according to claim 1, characterized in that: The axial pressure mechanism includes a cylinder and a transmission member; the cylinder is arranged on the top plate, and the transmission member is connected to the transmission member; The first shell is further provided with a through hole, an inner wall of the through hole is provided with a sealing member, and the transmission member is connected to the inner wall of the through hole through the sealing member.

8. The experimental device for evaluating the stability of a culvert structure in soft soil according to claim 7, characterized in that: The detection mechanism includes a pressure detection component, which is arranged in the accommodating cavity and is used to detect the pressure in the accommodating cavity.

9. The experimental device for evaluating the stability of a culvert structure in soft soil according to claim 8, characterized in that: The detection mechanism further includes a distance detection member, which is arranged on the transmission member and is used to detect the movement distance of the transmission member.

10. The experimental device for evaluating the stability of a culvert structure base in a soft soil region according to claim 9, characterized in that: The pressure detecting element is a pressure sensor and / or the distance detecting element is a distance sensor.

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