Vertical shaft fracture type grouting curtain excavation unloading analog simulation test system and method

A grouting curtain, excavation and unloading technology, applied in the field of shaft grouting curtain, can solve the problems of difficulty in meeting the simulation needs of unloading stress path, without considering the effect of fillings in cracks, unable to simulate crack-type grouting curtain, etc. , to achieve the effect of real excavation unloading stress path, important application value and promotion value, and easy implementation

Active Publication Date: 2021-01-26
CHINA UNIV OF MINING & TECH (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, conventional sample preparation methods can artificially prefabricate surrounding rock fissures, but the influence of filling materials in the fissures has not been considered, so it cannot simulate the fissure-type grouting curtain filled with grout
At the same time, there are still some deficiencies in the existing unloading test methods. The uniaxial test generally adopts the cyclic loading and unloading test method, which is difficult to consider the influence of the confining pressure; the triaxial test can consider the effect of the confining pressure, and the test method of unloading the minimum principal stress is usually used. It is difficult to meet the simulation needs of the real unloading stress path of excavation unloading

Method used

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  • Vertical shaft fracture type grouting curtain excavation unloading analog simulation test system and method
  • Vertical shaft fracture type grouting curtain excavation unloading analog simulation test system and method
  • Vertical shaft fracture type grouting curtain excavation unloading analog simulation test system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Example 1. Shaft fissure-type grouting curtain excavation and unloading similar simulation test system

[0053] Such as Figure 8 The vertical shaft fissure type grouting curtain excavation and unloading similar simulation test system shown includes a rigid loading chamber side wall 21, a base 18, an axial pressure piston 19, an upper pressing plate 16, a lower pressing plate 17, an external pressure oil pump 24 and an internal pressure oil pump 25, the base 18 is connected to the lower part of the rigid loading chamber side wall 21 through a load-bearing snap ring 22; the lower pressure plate 17 is installed on the upper surface of the base 18, and the axial pressure piston 19 is installed on the The top of the rigid loading chamber side wall 21; the space surrounded by the base 18, the rigid loading chamber side wall 21 and the axial pressure piston 19 is a high pressure loading chamber 15; the power output end of the axial pressure piston 19 is connected to the The ...

Embodiment 2

[0056] Example 2. Similar Simulation Test Method for Shaft Crack Type Grouting Curtain Excavation and Unloading

[0057] (A) pouring of the surrounding rock sample of the prefabricated crack thick-walled cylindrical shaft;

[0058] Such as figure 1 As shown, a thick-walled cylindrical shaft surrounding rock sample is made by using a polyethylene plastic bucket 1 and a PVC pipe 2, including the following steps:

[0059] (A-1) If figure 2 As shown, the polyethylene plastic barrel 1 is set outside the PVC pipe 2, and the polyethylene plastic barrel 1 and the PVC pipe 2 are coaxial; the polyethylene plastic barrel has a wall thickness of 6-8 mm, an inner diameter of Φ200-240 mm, and a height of 280-320 mm. The wall thickness of the PVC pipe is 2.0mm, the outer diameter is Φ30-50mm, and the length is 300-350mm. In order to facilitate the installation of pre-embedded paraffin sheets and monitoring sensors, grooves are made on the outer wall of the polyethylene plastic barrel 1 w...

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Abstract

The invention discloses a vertical shaft fracture type grouting curtain excavation unloading analog simulation test system and method. The method comprises the steps: pouring a prefabricated fracturethick-wall cylindrical vertical shaft surrounding rock sample; manufacturing a vertical shaft fracture type grouting curtain sample; performing initial three-dimensional ground stress loading reduction on the vertical shaft fracture type grouting curtain; carrying out shaft fracture type grouting curtain excavation unloading simulation; and monitoring the excavation unloading effect of the vertical shaft fracture type grouting curtain. The sample preparation method provided by the invention can be used for preparing vertical shaft fracture type grouting curtain samples with different fractureoccurrences and different slurry types. According to the provided unloading test method, excavation and unloading simulation of the vertical shaft grouting curtain under different ground stress levelsand different unloading rates can be carried out, and the deformation damage law and damage degradation characteristics of the fractured grouting curtain under vertical shaft excavation and unloadingare reproduced. The system and method are suitable for experimental study of vertical shaft grouting curtain water plugging effectiveness and excavation unloading effect in mine construction. A simulation test of a high ground stress, a strong unloading amplitude and a real excavation unloading stress path can be realized.

Description

technical field [0001] The invention relates to the technical field of shaft grouting curtains. Specifically, it is a similar simulation test system and method for shaft fissure type grouting curtain excavation and unloading. Background technique [0002] Shaft grouting curtain is an important water control structure for the aquifer in the bedrock section of the shaft. With the excavation of the shaft shaft, all or most of the original rock stress on the excavation profile surface is removed, and the surrounding rock changes from a three-dimensional stress state to a two-dimensional stress state. Excavation and unloading will lead to the redistribution of surrounding rock stress, causing deformation of the wellbore grouting curtain and initiation and expansion of micro-cracks, resulting in damage and deterioration of the grouting curtain and a decrease in the water shutoff effect. In recent years, there have been many wellbore water inflow accidents caused by the deteriora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N3/02G01N3/12
CPCG01N1/28G01N3/02G01N3/12
Inventor 周禹良李生生侯公羽刘书杰贺文袁东锋杨雪
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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