Testing device and method for simulating influence of hydrostatic pressure on underground structure

Abstract

The invention discloses a test device and method for simulating the influence of hydrostatic pressure on an underground structure, and relates to the technical field of hydrostatic pressure simulation test equipment.The test device comprises a maintenance assembly, a foundation sample and a test device, and the pressurization assembly communicates with the maintenance assembly and is used for adjusting the pressure of the maintenance liquid in the containing cavity. The actual hydrostatic pressure of the foundation under water is simulated by pressurizing the curing liquid in the curing box through the pressurizing assembly, so that the influence effect of the hydrostatic pressure on the foundation structure can be evaluated. The pressurizing assembly pressurizes the curing liquid in the pressurizing box in the mode that the back pressure jack presses the pressure adjusting cover downwards so as to indirectly pressurize the curing liquid in the curing box, the preset hydrostatic pressure in the curing box can be achieved, and the pressurizing assembly is simple in structure and convenient to operate and has good application prospects and wide application range.

Description

Technical Field

[0001] The invention relates to the technical field of hydrostatic pressure simulation test equipment, and in particular to a test device and method for simulating the influence of hydrostatic pressure on underground structures. Background Art

[0002] The foundation piles of sea-crossing bridges usually go deep into the rock layer on the seabed to ensure the stability and durability of the bridge. The piles are generally made of concrete or cement soil. At the same time, if the groundwater level is high, the foundation piles also need to pass through the groundwater to reach the impermeable rock layer to ensure that the foundation has sufficient bearing capacity. The foundation piles will be subject to greater hydrostatic pressure in the groundwater or seawater environment, which will affect the structural strength. In addition, groundwater and seawater are usually corrosive to the piles. As the hydrostatic pressure changes, the degree of corrosion to the structure also changes, thus affecting the durability of the structure. Therefore, it is of great significance to study the influence of hydrostatic pressure on the strength and durability of the foundation structure and other engineering characteristics, which can effectively avoid problems such as insufficient foundation bearing capacity and building collapse in engineering construction.

[0003] The existing technology currently uses indoor maintenance to simulate the underwater environment of the foundation, which has the following problems:

[0004] (1) There is a lack of equipment to simulate hydrostatic pressure, making it impossible to simulate the effect of hydrostatic pressure on the foundation structure;

[0005] (2) During the curing process, the subsequent adjustment of the curing liquid will cause different degrees of disturbance to the specimen, thus affecting the test results.

[0006] In view of this, how to provide a device that can truly simulate the underwater environment and hydrostatic pressure is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0007] The purpose of the present invention is to provide a test device and method for simulating the influence of hydrostatic pressure on underground structures, so as to solve the problems existing in the prior art.

[0008] To achieve the above object, the present invention provides a test device for simulating the influence of hydrostatic pressure on underground structures, comprising:

[0009] The curing assembly defines a sealed accommodating cavity inside, the accommodating cavity is filled with a curing liquid, and the foundation sample is placed in the accommodating cavity;

[0010] A pressurizing component is communicated with the curing component, and the pressurizing component is used to adjust the pressure of the curing liquid in the accommodating chamber.

[0011] Furthermore, the maintenance component includes:

[0012] A curing box, which defines an accommodating cavity inside and has an upper opening on the top that is connected to the accommodating cavity. The curing box is provided with a water inlet that is connected to the accommodating cavity, and the pressurizing component is connected to the water inlet;

[0013] A sealing component, wherein the outer edge of the upper opening is provided with a slot adapted to the shape of the sealing component, the sealing component is arranged in the slot by bolts and seals the upper opening, and a sealing gasket is arranged between the sealing component and the upper opening.

[0014] Furthermore, the maintenance component also includes:

[0015] The partition is arranged in the accommodating chamber and divides the accommodating chamber into an upper chamber and a lower chamber, and the foundation sample is placed in the upper chamber and / or the lower chamber.

[0016] Furthermore, the pressurizing component includes:

[0017] A pressurized box, which is a cylindrical structure with a pressurized port on the top;

[0018] A pressure regulating cover adapted to the shape of the inner surface of the pressurizing box and slidably disposed on the inner surface of the pressurizing box;

[0019] A back-pressure jack, corresponding to the pressurizing port, wherein the output end of the back-pressure jack can extend from the pressurizing port into the pressurizing box and drive the pressure regulating cover to move along the length direction of the pressurizing box;

[0020] A water inlet pipe, one end of which is connected to the pressurizing tank and the other end of which is connected to the curing tank, wherein the water inlet pipe is provided with a water inlet valve, a pressure control valve and a first pressure gauge;

[0021] The pressurizing box is filled with curing liquid, and the counter-pressure jack pressurizes the curing liquid in the pressurizing box and the curing box through a pressure regulating cover.

[0022] Furthermore, the pressure regulating cover is provided with exhaust holes through the upper and lower surfaces, an exhaust valve is provided on the exhaust hole, and a waterproof rubber ring is provided on the outer side of the pressure regulating cover.

[0023] Furthermore, a collection component is also included, and the collection component includes:

[0024] A drainage pipe, wherein the maintenance box is provided with a drainage port connected to the accommodating chamber, one end of the drainage pipe is connected to the drainage port, and the other end is connected to the collection box;

[0025] The drain pipe is provided with a drain valve and a second pressure gauge.

[0026] Furthermore, the sealing component is provided with pressure relief holes penetrating the upper and lower surfaces, and a pressure relief valve is provided on the pressure relief hole.

[0027] The present invention also provides a test method for simulating the influence of hydrostatic pressure on underground structures, and the test device for simulating the influence of hydrostatic pressure on underground structures is used, comprising the following steps:

[0028] S1: Input curing liquid: Place the foundation sample into the containing cavity and install the sealing assembly, close the drainage valve, open the water inlet valve and the pressure control valve, inject the curing liquid into the pressurized box, and inject the curing liquid into the curing box along the water inlet pipe until the entire curing box is filled with the curing liquid;

[0029] S2: Pressure regulation: The pressure regulating cover is pressed down by the back-pressure jack, and the pressure regulating cover presses down the curing liquid in the pressurized box, and at the same time pressurizes the curing liquid in the curing box. When the first pressure gauge detects that the preset pressure value is reached, the back-pressure jack stops pressing down and maintains the pressure;

[0030] S3: Sampling: After the curing time is reached, the back pressure jack is reset to restore the initial pressure of the curing fluid in the pressurized box and the curing box; the water inlet valve and the pressure control valve are closed, the drain valve is opened to allow the curing fluid to flow into the collection box, and the sealing assembly is removed to take out the foundation sample.

[0031] Furthermore, when the curing liquid needs to be replaced during the curing process, the following steps are also included:

[0032] Close the water inlet valve and pressure control valve, keep the drain valve closed, and maintain the curing liquid pressure in the curing tank; reset the back pressure jack to restore the curing liquid in the pressurized tank to its initial pressure;

[0033] New curing liquid is injected into the pressurized box, and the back-pressure jack presses down the pressure regulating cover again, and the pressure regulating cover presses down the curing liquid in the pressurized box until the first pressure gauge detects that the preset pressure value has been reached, and the back-pressure jack stops pressing down and maintains the pressure;

[0034] Open the water inlet valve and the pressure control valve, and the new curing liquid is mixed into the curing tank by diffusion.

[0035] The present invention discloses the following technical effects:

[0036] 1. The curing liquid in the curing box is pressurized by the pressurizing component to simulate the real hydrostatic pressure of the foundation under water, so as to evaluate the effect of the hydrostatic pressure on the foundation structure.

[0037] 2. The pressurizing component uses a back-pressure jack to press down the pressure regulating cover to pressurize the curing liquid in the pressurizing box, thereby indirectly pressurizing the curing liquid in the curing box so that the preset hydrostatic pressure is reached in the curing box. The pressurizing component has a simple structure and is easy to operate, and has good application prospects and a wide range of applications.

[0038] 3. Pressure gauges are installed at the water inlet and outlet of the curing box to detect the curing liquid pressure in the curing box in real time, further improving the test precision and accuracy.

[0039] 4. When it is necessary to change the curing liquid during the curing process, the present invention adopts diffusion to mix the new curing liquid with the original curing liquid, which can effectively avoid disturbance of the foundation sample and improve the test precision and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a schematic diagram of the structure of the present invention;

[0042] Figure 2 It is a schematic diagram of the overall structure of the maintenance component of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of the sealing assembly of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure of the pressurizing component of the present invention;

[0045] Figure 5 For the present invention Figure 4 Schematic diagram of the structure of the medium pressure regulating cover;

[0046] Figure 6 This is a schematic diagram of the structure of the collection component of the present invention;

[0047] in:

[0048] 100, pressurizing assembly; 110, pressurizing box; 120, pressure regulating cover; 121, handle; 122, exhaust valve; 123, exhaust hole; 124, waterproof rubber ring; 130, water inlet pipe; 140, water inlet valve; 150, first pressure gauge; 160, pressure control valve; 170, back pressure jack;

[0049] 200, maintenance assembly; 210, maintenance box; 211, slot; 212, first bolt hole; 213, drain outlet; 214, water inlet; 215, filter screen; 216, partition; 217, sealing gasket; 220, sealing assembly; 221, second bolt hole; 222, bolt; 223, pressure relief valve;

[0050] 300. Collection assembly; 310. Collection box; 320. Drain pipe; 330. Second pressure gauge; 340. Drain valve. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] An embodiment of the present invention provides a test device for simulating the influence of hydrostatic pressure on underground structures, comprising:

[0054] The curing assembly 200 defines a sealed receiving chamber inside, the receiving chamber is filled with a curing liquid, and the foundation sample is placed in the receiving chamber;

[0055] The pressurizing component 100 is connected to the curing component 200 and is used to adjust the pressure of the curing liquid in the containing chamber.

[0056] In this embodiment, the maintenance assembly 200 includes:

[0057] The curing box 210 is made of stainless steel to avoid deformation and corrosion. A receiving cavity is defined inside the curing box 210. An upper opening communicating with the receiving cavity is provided at the top. The curing box 210 is provided with a water inlet 214 communicating with the receiving cavity. The pressurizing assembly 100 is communicated with the water inlet 214.

[0058] The outer edge of the upper opening of the sealing component 220 is provided with a slot 211 that matches the shape of the sealing component 220, the slot 211 is provided with a first bolt hole 212, the sealing component 220 is provided with a second bolt hole 221, the sealing component 220 is fixed in the slot 211 by bolts 222 and seals the upper opening, and a sealing gasket 217 is provided between the sealing component 220 and the upper opening. The sealing component 220 can prevent outside air from entering the curing box 210 and maintain the internal pressure of the curing box 210.

[0059] In this embodiment, the maintenance assembly 200 further includes:

[0060] The partition 216 is made of plastic material, is arranged in the accommodating chamber and divides the accommodating chamber into an upper chamber and a lower chamber. The foundation sample is placed in the upper chamber and / or the lower chamber. The setting of the partition 216 can increase the contact area between the foundation sample and the curing liquid.

[0061] In this embodiment, the pressurizing assembly 100 includes:

[0062] A pressurizing box 110, which is a cylindrical structure with a pressurizing port at the top;

[0063] The pressure regulating cover 120 is adapted to the inner surface shape of the pressurizing box 110 and is slidably arranged on the inner surface of the pressurizing box 110. A handle 121 is arranged on the upper surface of the pressure regulating cover 120 to facilitate installation and manual operation;

[0064] The back pressure jack 170 is fixed on the top of the pressurizing box 110 through a mounting frame, and its output end corresponds to the pressurizing port. The output end of the back pressure jack 170 can extend from the pressurizing port into the pressurizing box 110 and drive the pressure regulating cover 120 to move along the length direction of the pressurizing box 110;

[0065] The water inlet pipe 130 is connected to the pressurizing box 110 at one end and to the curing box 210 at the other end. The water inlet pipe 130 is provided with a water inlet valve 140, a pressure control valve 160 and a first pressure gauge 150. The water inlet pipe 130 can be provided on each of the left and right sides of the curing box 210 to inject curing liquid into the curing box 210 from two opposite directions at the same time. The heights of the two water inlet pipes 130 should be consistent to ensure that the water inlet pressures at the two locations are the same.

[0066] The pressurizing tank 110 is filled with curing liquid, and the back pressure jack 170 pressurizes the curing liquid in the pressurizing tank 110 and the curing tank 210 through the pressure regulating cover 120 .

[0067] In this embodiment, the first pressure gauge 150 can effectively detect the hydrostatic pressure in the curing box 210. Specifically, the hydrostatic pressure is calculated using the formula: P = ρgh, where P is the design hydrostatic pressure (Pa), ρ is the density of the curing fluid, g is 9.80 N / kg, and h is the depth below the groundwater level of the test design sample (m); the force required to be applied by the back pressure jack 170 is calculated using the formula Calculate, where P is the calculated test design hydrostatic pressure, S is the contact area between the pressure regulating cover 120 and the curing liquid, and the formula S = πr 2 Calculate, r is the inner diameter of the pressurized box 110.

[0068] In this embodiment, an exhaust hole 123 is provided through the upper and lower surfaces of the pressure regulating cover 120 , an exhaust valve 122 is provided on the exhaust hole 123 , and a waterproof rubber ring 124 is provided on the outer side of the pressure regulating cover 120 .

[0069] In this embodiment, a collection component 300 is also included, and the collection component 300 includes:

[0070] Drain pipe 320, the curing box 210 is provided with a drain port 213 communicating with the accommodating chamber, one end of the drain pipe 320 is communicated with the drain port 213, and the other end is communicated with the collecting box 310;

[0071] A drainage valve 340 and a second pressure gauge 330 are provided on the drainage pipe 320 , and filter screens 215 are provided at the water inlet 214 and the drainage outlet 213 to prevent the surface of the foundation sample from falling off and blocking the water inlet 214 and the drainage outlet 213 .

[0072] In this embodiment, the sealing assembly 220 is provided with pressure relief holes through the upper and lower surfaces, and a pressure relief valve 223 is provided on the pressure relief hole.

[0073] The embodiment of the present invention further provides a test method for simulating the influence of hydrostatic pressure on underground structures, using the test device for simulating the influence of hydrostatic pressure on underground structures, comprising the following steps:

[0074] S1: Input curing liquid: Place the foundation sample into the receiving chamber and install the sealing assembly 220, close the drainage valve 340, open the water inlet valve 140 and the pressure control valve 160, inject the curing liquid into the pressurized box 110, and inject the curing liquid into the curing box 210 along the water inlet pipe 130 until the entire curing box 210 is filled with the curing liquid;

[0075] S2: Pressure regulation: Open the exhaust valve 122, press down the pressure regulating cover 120 through the back pressure jack 170 until the pressure regulating cover 120 contacts the liquid surface of the curing liquid in the pressurizing tank 110, close the exhaust valve 122, continue to press down the pressure regulating cover 120, the pressure regulating cover 120 presses down the curing liquid in the pressurizing tank 110, and pressurizes the curing liquid in the curing tank 210 at the same time, when the first pressure gauge 150 detects that the preset pressure value is reached, the back pressure jack 170 stops pressing down and maintains the pressure;

[0076] S3: Sampling: After the curing time is reached, the back pressure jack 170 is reset to restore the initial pressure of the curing liquid in the pressurizing box 110 and the curing box 210; the water inlet valve 140 and the pressure control valve 160 are closed, and the drain valve 340 is opened to allow the curing liquid to flow into the collection box 310; the sealing assembly 220 is removed to take out the foundation sample.

[0077] When the curing liquid needs to be replaced during the curing process, the following steps are also included:

[0078] Close the water inlet valve 140 and the pressure control valve 160, keep the drain valve 340 closed, and maintain the pressure of the curing liquid in the curing tank 210; reset the back pressure jack 170 to restore the initial pressure of the curing liquid in the pressurizing tank 110;

[0079] New curing liquid is injected into the pressurizing box 110, and the back-pressure jack 170 presses down the pressure regulating cover 120 again, and the pressure regulating cover 120 presses down the curing liquid in the pressurizing box 110 until the first pressure gauge 150 detects that the preset pressure value is reached, and the back-pressure jack 170 stops pressing down and maintains the pressure;

[0080] The water inlet valve 140 and the pressure control valve 160 are opened, and the new curing liquid is mixed into the curing tank 210 by diffusion.

[0081] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0082] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A test device for simulating the effect of hydrostatic pressure on underground structures, characterized in that: include: A curing assembly (200) defines a sealed accommodating chamber inside, the accommodating chamber is filled with a curing liquid, and a foundation sample is placed in the accommodating chamber; The pressurizing component (100) is in communication with the curing component (200), and the pressurizing component (100) is used to adjust the pressure of the curing liquid in the containing chamber.

2. A test device for simulating the effect of hydrostatic pressure on underground structures according to claim 1, characterized in that: The maintenance component (200) comprises: A curing box (210) defines a receiving cavity inside thereof, and has an upper opening at the top thereof which is in communication with the receiving cavity; the curing box (210) is provided with a water inlet (214) in communication with the receiving cavity, and the pressurizing component (100) is in communication with the water inlet (214); A sealing component (220), wherein the outer edge of the upper opening is provided with a groove (211) adapted to the shape of the sealing component (220), the sealing component (220) is arranged in the groove (211) by means of a bolt (222) and seals the upper opening, and a sealing gasket (217) is provided between the sealing component (220) and the upper opening.

3. A test device for simulating the effect of hydrostatic pressure on underground structures according to claim 2, characterized in that: The maintenance component (200) further comprises: A partition (216) is arranged in the accommodating chamber and divides the accommodating chamber into an upper chamber and a lower chamber, and the foundation sample is placed in the upper chamber and / or the lower chamber.

4. A test device for simulating the effect of hydrostatic pressure on underground structures according to claim 3, characterized in that: The pressurizing assembly (100) comprises: A pressurizing box (110), wherein the pressurizing box (110) is a cylindrical structure with a pressurizing port at the top; A pressure regulating cover (120) adapted to the shape of the inner surface of the pressurizing box (110) and slidably disposed on the inner surface of the pressurizing box (110); A back-pressure jack (170) corresponding to the pressurizing port, wherein the output end of the back-pressure jack (170) can extend from the pressurizing port into the pressurizing box (110) and drive the pressure regulating cover (120) to move along the length direction of the pressurizing box (110); a water inlet pipe (130), one end of which is in communication with the pressurizing box (110) and the other end of which is in communication with the curing box (210); the water inlet pipe (130) is provided with a water inlet valve (140), a pressure control valve (160) and a first pressure gauge (150); The pressurizing box (110) is filled with curing liquid, and the counter-pressure jack (170) pressurizes the curing liquid in the pressurizing box (110) and the curing box (210) through the pressure regulating cover (120).

5. A test device for simulating the effect of hydrostatic pressure on underground structures according to claim 4, characterized in that: The pressure regulating cover (120) is provided with an exhaust hole (123) penetrating the upper and lower surfaces, and an exhaust valve (122) is provided on the exhaust hole (123). A waterproof rubber ring (124) is provided on the outer side of the pressure regulating cover (120).

6. A test device for simulating the effect of hydrostatic pressure on underground structures according to claim 5, characterized in that: The invention also comprises a collecting assembly (300), wherein the collecting assembly (300) comprises: a drain pipe (320), the curing box (210) being provided with a drain port (213) communicating with the accommodating chamber, one end of the drain pipe (320) being communicated with the drain port (213), and the other end being communicated with the collecting box (310); The drainage pipe (320) is provided with a drainage valve (340) and a second pressure gauge (330).

7. A test device for simulating the effect of hydrostatic pressure on underground structures according to claim 6, characterized in that: The sealing component (220) is provided with pressure relief holes penetrating the upper and lower surfaces, and a pressure relief valve (223) is provided on the pressure relief hole.

8. A test method for simulating the effect of hydrostatic pressure on underground structures, characterized in that: The test device for simulating the effect of hydrostatic pressure on underground structures according to claim 6 or 7 comprises the following steps: S1: Inputting curing liquid: placing the foundation sample into the containing cavity and installing the sealing assembly (220), closing the drainage valve (340), opening the water inlet valve (140) and the pressure control valve (160), injecting the curing liquid into the pressurizing box (110), and injecting the curing liquid into the curing box (210) along the water inlet pipe (130) until the entire curing box (210) is filled with the curing liquid; S2: Pressure regulation: The pressure regulating cover (120) is pressed down by the back pressure jack (170), and the pressure regulating cover (120) presses down the curing liquid in the pressurizing box (110), and at the same time pressurizes the curing liquid in the curing box (210). When the first pressure gauge (150) detects that the pressure reaches a preset pressure value, the back pressure jack (170) stops pressing down and maintains the pressure; S3: Sampling: After the curing time is reached, the back pressure jack (170) is reset to restore the initial pressure of the curing liquid in the pressurizing box (110) and the curing box (210); the water inlet valve (140) and the pressure control valve (160) are closed, the drain valve (340) is opened to allow the curing liquid to flow into the collection box (310), and the sealing assembly (220) is removed to take out the foundation sample.

9. A test method for simulating the effect of hydrostatic pressure on underground structures according to claim 8, characterized in that: When the curing liquid needs to be replaced during the curing process, the following steps are also included: The water inlet valve (140) and the pressure control valve (160) are closed, and the drain valve (340) is kept closed to maintain the pressure of the curing liquid in the curing tank (210); the back pressure jack (170) is reset to restore the initial pressure of the curing liquid in the pressurizing tank (110); New curing liquid is injected into the pressurizing box (110), and the back-pressure jack (170) presses down the pressure regulating cover (120) again, and the pressure regulating cover (120) presses down the curing liquid in the pressurizing box (110) until the first pressure gauge (150) detects that the preset pressure value has been reached, and then the back-pressure jack (170) stops pressing down and maintains the pressure; The water inlet valve (140) and the pressure control valve (160) are opened, and the new curing liquid is mixed into the curing tank (210) by diffusion.

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