Coverage type karst collapse simulation test device and operation method thereof

A karst collapse and simulation test technology, applied in the field of karst ground subsidence research, can solve the problems of many influencing factors, affecting the reliability of simulation, and the difficulty in analyzing the interaction mode and influence law of multi-structure collapse, and achieve convenient test conditions and simulation The effect of complex working conditions and rich test data

Active Publication Date: 2020-05-08
山东大学(齐河)新材料与智能装备研究院 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex genetic mechanism, numerous influencing factors and strong concealment of karst collapse, its catastrophic mechanism and evolution process are still unclear.
Physical simulation test is an important means to carry out research on karst collapse. The inventors found that the existing simulation test device can show the catastrophe process and disaster-causing mode more intuitively, but there are still some technical deficiencies, mainly including: (1) The simulated working conditions of some devices are relatively single, which cannot fully characterize the complex environmental geological conditions of the collapse; (2) The size of the opening of the karst structure is an important factor affecting the collapse, but most of the existing devices are fixed openings, and the size cannot be adjusted; (3 ) Most of the existing devices simulate a single karst structure, and it is difficult to analyze the interaction mode and influence law of multi-structure collapse; (4) The existing devices are mostly welded by steel plates, and excavation and observation are required after the test is completed. complex and affects the reliability of the simulation

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  • Coverage type karst collapse simulation test device and operation method thereof
  • Coverage type karst collapse simulation test device and operation method thereof
  • Coverage type karst collapse simulation test device and operation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Attached below Figure 1-Figure 7 The present invention is described in detail, specifically, the structure is as follows:

[0046] This embodiment provides a covered karst collapse simulation test device, including a water level control box 1, a collapse simulation box 2, an overflow device, a water passage 3, and a karst structure opening 5, and the overflow device is installed on the side of the water level control box 1 There are multiple karst structure openings 5, and they are installed at the bottom of the collapse simulation box 2;

[0047] The water inlet valve 7 is installed near one end of the water level control box 1 bottom of the water passing pipeline 3, and the drain valve 8 is installed at the other end of the water passing pipeline 3, and the water supply for the collapse simulation box 2 is provided by opening the water inlet valve 7 and closing the drain valve 8. At the same time, the water passing pipe 3 can provide a migration channel for the coll...

Embodiment 2

[0056] The karst structure opening 5 at the bottom of the collapse simulation box 2 is closed by controlling the valve 6, and then soil is filled into the collapse simulation box 2 according to the design parameters. When filling the soil, it needs to be laid layer by layer according to a certain density until the design thickness is reached. At the same time, a certain number of stress-strain sensors 15 are buried according to the test requirements to monitor the stress and strain data at different positions during the soil layer subsidence process.

[0057] During the soil filling process, use a sponge to block the piezometric tubes 9 and 10 on both sides of the collapse simulation box 2 where they are in contact with the soil, so as to prevent the soil from clogging the piezometric tubes 9 and 10 and thus affecting the water level measurement Accuracy, at the same time, paste the vertical scale on the pipe wall for easy reading.

[0058] After the filling is completed, a pl...

Embodiment 3

[0063] The karst structure opening 5 at the bottom of the collapse simulation box 2 is closed by controlling the valve 6, and soil is filled into the collapse simulation box 2. Afterwards, according to the test design conditions, two rock structure control valves 6 with different spacings are opened. For example, 1. fully open the second and third karst structure control valves 6 at the bottom of the collapse simulation box 2 as the first research condition; 2. set the second and fourth control valves 6 at the bottom of the collapse simulation box 2 Fully open as the second working condition; 3. Fully open the first and fifth control valves 6 at the bottom of the collapse simulation box 2 as the third working condition.

[0064] At the same time, the height of the water level in the water level control box 1 and the thickness of the soil layer in the collapse simulation box 2 were set as fixed values, and other test operation steps were the same as in the second embodiment. B...

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Abstract

The invention discloses a coverage type karst collapse simulation test device and an operation method thereof. The problems that in the prior art, an opening of a karst structure cannot be adjusted, the interaction mode and the influence rule of multi-structure collapse are difficult to analyze, and operation is complex are solved. The catastrophe evolution process of covered karst surface collapse can be effectively simulated, and meanwhile, key influence factors such as the size, number and position of karst structures, the thickness of a covered soil layer and underground water level changecan be conveniently adjusted. According to the technical scheme, the device comprises a water level control box and a collapse simulation box, wherein an overflow device for adjusting the water levelin the water level control box is mounted on one side of the water level control box; the collapse simulation box is used for filling a soil body, a plurality of karst structure openings are formed in the bottom of the collapse simulation box in the length direction at equal intervals, and control valves used for adjusting the sizes of the openings are installed on the karst structure openings; wherein the water level control box is connected with the karst structure opening through a water passing pipeline, and the water passing pipeline can supply water to the collapse simulation box.

Description

technical field [0001] The invention relates to the field of karst ground subsidence research, in particular to a covering type karst subsidence simulation test device and an operation method thereof. Background technique [0002] Overlying karst collapse usually refers to the disaster phenomenon that the overlying soil layer of karst structures such as karst caves and troughs is deformed and destroyed under the action of groundwater and external forces, which eventually leads to ground subsidence. With the rapid advancement of the urbanization process, karst ground subsidence disasters frequently occur in the karst areas of southwest my country, leading to serious consequences such as road damage and building overturning, directly threatening the safety of people's lives and property. [0003] The research on the catastrophic mechanism and prevention and control technology of karst collapse has been widely concerned. However, due to the complex genetic mechanism of karst c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 杨磊宋光啸林春金张庆松覃剑文林荣峰李让杰张耀磊
Owner 山东大学(齐河)新材料与智能装备研究院
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