Underground environment simulation device based on soil pressure and ion erosion and working method

Abstract

The invention discloses an underground environment simulation device based on soil pressure and ion erosion and a working method, which are an experimental device capable of ensuring uniform control of ion distribution and simultaneously simulating soil pressure and erosive ion action, and can truly reproduce the influence of multi-factor collaboration on materials in an underground environment. According to the technical scheme, a test cavity is composed of two semicircular pressure transmission plates, an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are arranged at the two ends of the semicircular pressure transmission plates respectively, and a test rack is further arranged outside the test cavity; a pressure rod is arranged between the pressure transmission plate and the test rack; the corrosive ion implantation system is composed of a spiral pipeline, the spiral pipeline is arranged around the test block, and a plurality of micropores are uniformly distributed in the wall of the spiral pipeline; data acquisition elements in the data monitoring system are arranged in soil and are connected with a data acquisition device, and the data acquisition device transmits data records to a computer terminal.

Description

Technical Field

[0001] The invention belongs to the field of coastal underground service environment simulation, and in particular relates to an underground environment simulation device and a working method based on soil pressure and ion corrosion. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, in coastal environments, the service environment of pipelines and other underground structures is becoming increasingly complex. Under the combined effects of soil pressure and various chemical erosions for a long time, the performance of underground structure structures and materials has gradually deteriorated. In particular, with the unpredictable current climate and natural environment, the types and quantities of various corrosive ions in the soil have increased. For example, in acidic, saline-alkaline or high-water content soils, corrosive ions (such as sulfate, chloride, etc.) penetrate into the material and work together with soil pressure to cause cracking of pipelines, shedding of concrete surfaces, and even overall damage.

[0004] In actual underground environments, material degradation is often the result of the synergistic effect of multiple factors; however, most of the test equipment for actual simulation experiments on the durability of underground structures and pipeline materials focuses on the influence of a single factor; there are experimental devices that cannot simulate soil pressure and chemical erosion at the same time, and the diffusion of corrosive ions is difficult to control uniformly in existing experiments. The impact of soil density on pressure transmission, material stress state, and changes in the erosion environment is not considered. Summary of the invention

[0005] In response to the above problems, the underground environment simulation device and working method based on soil pressure and ion corrosion provided by the present invention can dynamically adapt to soil pressure, evenly control ion distribution and ensure long-term sealing. The experimental device can simultaneously simulate soil pressure and corrosive ion effects, and can truly reproduce the comprehensive impact of multiple factors on materials in the underground environment.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides an underground environment simulation device based on soil pressure and ion erosion, comprising: a test chamber, a loading system, a data monitoring system and an aggressive ion implantation system;

[0008] The test cavity is composed of two semicircular pressure transmission plates and an upper cover plate and a lower cover plate. The two semicircular pressure transmission plates form a circular cylindrical structure. The interior of the test cavity is used to fill test blocks and soil. The upper cover plate and the lower cover plate are respectively arranged at the two ends of the semicircular pressure transmission plates. A test frame is also arranged outside the test cavity; the loading system is composed of a plurality of pressure rods, and the pressure rods are arranged between the pressure transmission plates and the test frame; the corrosive ion injection system is composed of a spiral pipe, which is arranged around the test block, and a plurality of micropores are evenly distributed on the wall of the spiral pipe, and each micropore on the wall of the spiral pipe is provided with a filtering device;

[0009] The equipment is equipped with a data monitoring system including a data acquisition element and a data collection device. The data acquisition elements are arranged in the soil and are connected to the data acquisition device. The data collection device transmits the data records to a computer terminal.

[0010] Furthermore, the pressure transmission plate of the test cavity is made of two semicircular steel plates, the upper cover plate and the lower cover plate are also made of steel plates, and the two pressure transmission plates are connected by a mortise and tenon structure.

[0011] Furthermore, the sealing system includes a baffle and a sealing strip, the baffle is provided with a plug plate, the plug plate is embedded between the tenon and the groove of the pressure transmission plate, and the sealing strip is arranged between the upper cover plate, the lower cover plate and the two semicircular pressure transmission plates.

[0012] Furthermore, the pressure rods are evenly distributed on the pressure transmission plate, one end of the pressure rods is connected to the outer side of the pressure transmission plate, and the other end of the pressure rods is fixedly connected to the test frame.

[0013] Furthermore, a plurality of pressure rods are arranged on the two pressure transfer plates and the number of the pressure rods is the same.

[0014] Furthermore, the spiral pipe is made of corrosion-resistant material, and a plurality of micropores are evenly distributed on the pipe wall, and each micropore on the pipe wall of the spiral pipe is equipped with a filtering device.

[0015] Furthermore, a set distance is maintained between the spiral pipe and the test block.

[0016] Furthermore, the data acquisition element includes a pressure sensor, a temperature and humidity sensor, a pH tester and an ion concentration detection device, which are used to monitor pressure changes, soil conditions and ion concentration distribution in real time.

[0017] Furthermore, the pressure transmission plate and the baffle in the simulation device are made of corrosion-resistant materials.

[0018] In a second aspect, the present invention further provides a working method of an underground environment simulation device based on soil pressure and ion corrosion, comprising:

[0019] S1. Place the test block at the designated position inside the cylindrical test chamber, and then fill the chamber with soil to ensure that the test block is completely surrounded by the soil, while ensuring that the set distance between the spiral pipe and the test block is maintained;

[0020] S2. Apply force to the pressure rods by hydraulic or mechanical means, arrange the same number of pressure rods on the two pressure transmission plates, and evenly distribute the pressure in the test chamber by multi-point loading;

[0021] S3. Inject the prepared corrosive ion solution into the spiral pipe, so that the solution is evenly released into the soil through the micropores evenly distributed on the pipe wall and diffused to the surface of the test block;

[0022] S4. During the entire test process, the pressure sensor, temperature and humidity sensor, pH tester and ion concentration detection device installed in the test chamber will monitor the pressure change, soil state and ion concentration distribution data in real time, and transmit the monitoring data to the computer terminal through the acquisition device;

[0023] S5. After the test is completed, analyze the dynamic changes during the test; at the same time, clean, maintain or reuse the equipment.

[0024] Compared with the prior art, the present invention has the following advantages and positive effects:

[0025] The test cavity of the present invention is filled with test blocks and soil to simulate the stress and erosion mechanism of the pipeline in a real underground environment. By reasonably setting the distance between the spiral pipeline and the test block, injecting the corrosive ion solution and other operations, the diffusion path and erosion mechanism of the ions in the underground environment can be better simulated. The pressure transmission plate of the test cavity adopts the form of two pieces spliced ​​together to adapt to the change of soil from loose to dense, ensuring the effective transmission of the loading force. The spiral pipeline of the corrosive ion injection system is made of corrosion-resistant material, and the micropores of the pipe wall are equipped with a filtering device to prevent soil particles from clogging the pipeline and causing test errors. The spiral structure of the pipeline design can ensure uniform distribution of ions and avoid local aggregation of ion concentration, and can accurately simulate the concentration distribution of corrosive ions in the underground environment. The data monitoring system can monitor the pressure change, soil state and ion concentration distribution in real time, and transmit the data to the computer terminal, which is convenient for analyzing the dynamic changes during the test.

[0026] The pressure transmission plate of the test cavity of the present invention is connected by a mortise and tenon structure, and the convex tenon and the groove are embedded, which can dynamically fit under the action of external loading force, adapt to the change of soil from loose to dense, and avoid the separation of the test cavity wall and the soil due to the reduction of soil volume due to continuous pressure from external load force, thereby ensuring effective transmission of loading force; the baffle can dynamically fill the gap changes caused by soil densification to prevent soil particles from leaking out; at the same time, flexible sealing strips are arranged on the edges of the upper cover plate and the lower cover plate to prevent soil leakage due to changes in the cover plate diameter, thereby ensuring the integrity of the test environment; pressure rods are evenly distributed on the pressure transmission plate, and the same number of pressure rods are arranged on the two pressure transmission plates, and force is applied by hydraulic or mechanical means to evenly distribute the pressure in the test cavity by multi-point loading to avoid concentration of loading force; the mortise and tenon structure of the pressure transmission plate will always fit the soil as the soil volume changes, thereby ensuring that the loading force can be effectively transmitted to the inside of the soil, simulating a real underground pressure environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 It is the overall structure diagram of the simulation device of the present invention;

[0029] Figure 2 This is the external structure diagram of the test chamber of the present invention;

[0030] Figure 3 This is a diagram showing the internal structure of the test chamber of the present invention.

[0031] In the figure: 1. test chamber; 2. pressure rod; 3. test frame; 4. pressure transmission plate; 5. upper cover plate; 6. lower cover plate; 7. sealing strip; 8. plug plate; 9. baffle; 10. spiral pipe. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0034] The underground environment simulation device based on soil pressure and ion erosion disclosed in this embodiment is as follows: Figure 1-Figure 3 As shown, it includes a test chamber 1, a loading system, a data monitoring system and an aggressive ion implantation system; the test chamber 1 is composed of two semicircular pressure transmission plates 4 and an upper cover plate 5 and a lower cover plate 6, the two semicircular pressure transmission plates 4 form a circular cylindrical structure, the inside of the test chamber is used to fill test blocks and soil, the upper cover plate 5 and the lower cover plate 6 are respectively arranged at the two ends of the semicircular pressure transmission plate 4; a U-shaped test frame 3 is also arranged outside the test chamber 1; the loading system is composed of a plurality of evenly distributed pressure rods 2, one end of the pressure rod 2 is connected to the outside of the pressure transmission plate 4; the aggressive ion implantation system is composed of a spiral pipe 10, and a plurality of micropores are evenly distributed on the wall of the spiral pipe 10; the equipment is equipped with a data monitoring system including a data acquisition element and a data collection device, the data acquisition elements are arranged in the soil and are connected to the data acquisition device, and the acquisition device transmits the data records to a computer terminal.

[0035] The test cavity 1 is cylindrical in design, and is used to fill test blocks and soil inside to achieve a realistic simulation of the stress and erosion mechanism of the pipeline in the underground environment. The pressure transmission plate 4 of the test cavity 1 is made of two semicircular steel plates, and the upper cover plate 5 and the lower cover plate 6 are also made of steel plates. The two pressure transmission plates 4 are connected by a mortise and tenon structure, in which the convex tenon and the groove are connected in an interlocking manner, which can dynamically fit under the action of the external loading force, adapt to the change process of the soil from loose to dense, solve the problem of the separation of the test cavity wall and the soil due to the continuous pressure of the external load force causing the soil volume to shrink, and ensure the effective transmission of the loading force.

[0036] The sealing system includes a baffle 9 and a sealing strip 7. The baffle 9 is provided with a plug plate 8, and the plug plate 8 is embedded between the tenon and the groove of the pressure transmission plate 4. The sealing strip 7 is arranged between the upper cover plate 5 and the lower cover plate 6 and the two semicircular pressure transmission plates 4. The T-shaped baffle 9 is used to dynamically fill the gap changes caused by soil compaction to prevent soil particles from leaking out, while improving the long-term sealing performance of the equipment. At the same time, the edges of the upper cover plate 5 and the lower cover plate 6 of the equipment are provided with flexible sealing strips 7 to enhance the sealing performance and prevent soil leakage due to changes in the diameter of the cover plate, effectively ensuring the integrity of the test environment.

[0037] The pressure rods 2 are evenly distributed on the pressure transmission plate 4, one end of the pressure rod 2 is connected to the outside of the pressure transmission plate 4, and the other end of the pressure rod 2 is fixedly connected to the test frame 3; multiple pressure rods 2 are arranged on the two pressure transmission plates 4, and the number is the same. Uniform pressure is applied to the pressure plate by hydraulic or mechanical means, and the pressure in the test cavity is always evenly distributed during the test by multi-point loading, avoiding the concentration of loading force. Similarly, the mortise and tenon structure of the pressure transmission plate 4 will always fit the soil as the soil volume changes, ensuring that the loading force can be effectively transmitted to the inside of the soil, simulating the real underground pressure environment.

[0038] The spiral pipe 10 of the corrosive ion injection system is arranged around the test block. The spiral pipe 10 is made of corrosion-resistant material and has multiple micropores evenly distributed on the pipe wall. Each micropore on the pipe wall of the spiral pipe 10 is equipped with a filtering device to prevent soil particles from clogging the pipe and causing artificial test errors. The corrosive ion solution is injected through the spiral pipe 10, and the ion solution is evenly released from the micropores into the soil and diffused to the surface of the test block, simulating the concentration distribution of corrosive ions in the underground environment. The spiral pipe design can ensure the uniform distribution of ions and avoid the problem of localized aggregation of ion concentration, thereby ensuring the reliability and authenticity of the test results.

[0039] The interior of the cylindrical experimental cavity is used to fill the test block and soil, and the test block is completely surrounded by the soil. The spiral pipe 10 maintains a set distance from the test block to simulate the diffusion path and corrosion mechanism of ions in the underground environment.

[0040] The equipment is equipped with a data monitoring system, including a pressure sensor, a temperature and humidity sensor, a pH tester and an ion concentration detection device, which are used to monitor pressure changes, soil conditions and ion concentration distribution in real time. The pressure sensor, temperature and humidity sensor, pH tester and ion concentration detection device are arranged in the test chamber 1 and are all connected to a collection device. The collection device transmits data records to a computer terminal to facilitate analysis of dynamic changes during the test.

[0041] Preferably, but not limited to, the pressure transfer plate 4 and baffle 9 in the simulation device are made of corrosion-resistant materials, such as stainless steel or a polyethylene protective layer, and the main cavity of the test equipment is designed to be a detachable structure to facilitate cleaning, maintenance and reuse of the equipment, thereby improving the economy and applicability of the test.

[0042] The working method of the present invention mainly comprises the following steps:

[0043] S1. Place the test block at a designated position inside the cylindrical test cavity 1, and then fill the cavity with soil to ensure that the test block is completely surrounded by the soil. At the same time, pay attention to maintaining a set distance between the spiral pipe 10 and the test block.

[0044] S2. Apply force to the pressure rod 2 by hydraulic or mechanical means. Since the pressure rod 2 is evenly distributed and one end is connected to the outside of the pressure transmission plate 4 and the other end is fixedly connected to the test frame 3, and the same number of pressure rods 2 are arranged on the two pressure transmission plates 4, the pressure in the test chamber will be evenly distributed in a multi-point loading manner to avoid loading force concentration.

[0045] S3. Inject the prepared corrosive ion solution into the spiral pipe 10, so that the solution is evenly released into the soil through the micropores evenly distributed on the pipe wall and diffuses to the surface of the test block. The spiral structure of the pipe can ensure the uniform distribution of ions, avoid local aggregation of ion concentration, and simulate the concentration distribution of corrosive ions in the underground environment.

[0046] S4. During the entire test process, the pressure sensor, temperature and humidity sensor, pH tester and ion concentration detection device installed in the test chamber 1 will monitor the pressure changes, soil status and ion concentration distribution data in real time, and transmit the monitoring data to the computer terminal through the acquisition device for subsequent convenience.

[0047] S5. After the test is completed, the dynamic changes during the test are analyzed; at the same time, the equipment is cleaned, maintained or reused. The pressure transmission plate 4 and the baffle 9 are made of corrosion-resistant materials, which can better ensure the subsequent performance of the equipment and improve the economy and applicability of the test.

[0048] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. An underground environment simulation device based on soil pressure and ion erosion, characterized in that: include: Test chamber, loading system, data monitoring system and aggressive ion implantation system; The test cavity is composed of two semicircular pressure transmission plates and an upper cover plate and a lower cover plate. The two semicircular pressure transmission plates form a circular cylindrical structure. The interior of the test cavity is used to fill test blocks and soil. The upper cover plate and the lower cover plate are respectively arranged at the two ends of the semicircular pressure transmission plates. A tangible test frame is also arranged outside the test cavity; the loading system is composed of a plurality of pressure rods, and the pressure rods are arranged between the pressure transmission plates and the test frame; the corrosive ion injection system is composed of a spiral pipe, and the spiral pipe is arranged around the test block. A plurality of micropores are evenly distributed on the wall of the spiral pipe, and each micropore on the pipe wall of the spiral pipe is provided with a filtering device; The monitoring system comprises a data acquisition element and a data collection device. The data acquisition elements are arranged in the soil and are connected to the data acquisition device. The data collection device transmits the data records to a computer terminal.

2. The underground environment simulation device based on soil pressure and ion erosion as claimed in claim 1, characterized in that: The pressure transmission plate of the test cavity is made of two semicircular steel plates, and the upper cover plate and the lower cover plate are also made of steel plates. The two pressure transmission plates are connected by a mortise and tenon structure.

3. The underground environment simulation device based on soil pressure and ion erosion as claimed in claim 1, characterized in that: The sealing system comprises a baffle and a sealing strip, wherein the baffle is provided with a plug plate, wherein the plug plate is embedded between the tenon and the groove of the pressure transmission plate, and the sealing strip is arranged between the upper cover plate, the lower cover plate and the two semicircular pressure transmission plates.

4. The underground environment simulation device based on soil pressure and ion erosion according to claim 1, characterized in that: The pressure rods are evenly distributed on the pressure transmission plate, one end of the pressure rods is connected to the outer side of the pressure transmission plate, and the other end of the pressure rods is fixedly connected to the test frame.

5. The underground environment simulation device based on soil pressure and ion erosion as claimed in claim 4, characterized in that: A plurality of pressure rods are arranged on the two pressure transmission plates, and the number of the pressure rods is the same.

6. The underground environment simulation device based on soil pressure and ion erosion as claimed in claim 1, characterized in that: The spiral pipeline is made of corrosion-resistant material, and a plurality of micropores are evenly distributed on the pipeline wall. Each micropore on the pipeline wall of the spiral pipeline is equipped with a filtering device.

7. The underground environment simulation device based on soil pressure and ion corrosion according to claim 1, characterized in that: A set distance is maintained between the spiral pipeline and the test block.

8. The underground environment simulation device based on soil pressure and ion erosion as claimed in claim 1, characterized in that: The data acquisition element includes a pressure sensor, a temperature and humidity sensor, a pH tester and an ion concentration detection device, which are used to monitor pressure changes, soil conditions and ion concentration distribution in real time.

9. The underground environment simulation device based on soil pressure and ion erosion as claimed in claim 1, characterized in that: The pressure transmission plate and the baffle in the simulation device are both made of corrosion-resistant materials.

10. The working method of the underground environment simulation device based on soil pressure and ion corrosion according to any one of claims 2 to 9, characterized in that: include: S1. Place the test block at the designated position inside the cylindrical test chamber, and then fill the chamber with soil to ensure that the test block is completely surrounded by the soil, while ensuring that the set distance between the spiral pipe and the test block is maintained; S2. Apply force to the pressure rods by hydraulic or mechanical means, arrange the same number of pressure rods on the two pressure transmission plates, and evenly distribute the pressure in the test chamber by multi-point loading; S3. Inject the prepared corrosive ion solution into the spiral pipe, so that the solution is evenly released into the soil through the micropores evenly distributed on the pipe wall and diffused to the surface of the test block; S4. During the entire test process, the pressure sensor, temperature and humidity sensor, pH tester and ion concentration detection device installed in the test chamber will monitor the pressure change, soil state and ion concentration distribution data in real time, and transmit the monitoring data to the computer terminal through the acquisition device; S5. After the test is completed, analyze the dynamic changes during the test; at the same time, clean, maintain or reuse the equipment.

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