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
CN112268768AActive Publication Date: 2021-01-26CHINA UNIV OF MINING & TECH (BEIJING) +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH (BEIJING)
Publication Date
2021-01-26

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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.
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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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