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Quantification method of strain energy migration of surrounding rock of roadway under the action of excavation and unloading

A technology of excavation unloading and strain energy, applied in measurement devices, mechanical devices, instruments, etc., can solve problems such as ignoring quantitative research on the accumulation and release of strain energy, and achieve the effect of solving energy accumulation and reducing disasters

Inactive Publication Date: 2018-07-17
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It only qualitatively considers the accumulation, dissipation and release of energy on the deformation, damage and destruction of the roadway caused by the excavation and unloading of the rock mass, and ignores the quantitative research on the accumulation and release of strain energy during the excavation process of the rock mass.

Method used

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  • Quantification method of strain energy migration of surrounding rock of roadway under the action of excavation and unloading
  • Quantification method of strain energy migration of surrounding rock of roadway under the action of excavation and unloading
  • Quantification method of strain energy migration of surrounding rock of roadway under the action of excavation and unloading

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Embodiment Construction

[0037] The specific embodiment of the present invention will be described with reference to the accompanying drawings.

[0038] 1. Construction of roadway excavation model

[0039] The size of the experimental specimen is 150×150×150mm 3 , the diameter of the simulated roadway in the middle is 45mm. The control method is biaxial loading, in which the load applied in the horizontal direction is 9MPa, and the load applied in the vertical direction is 45MPa. The material parameters of the model come from the laboratory, and the specific parameters are shown in Table 1.

[0040] Table 1 Material parameters

[0041]

[0042] Numerical models before and after excavation such as Figure 1a with Figure 1b shown.

[0043] 2. Experimental steps

[0044] Apply the load to the imported model to a fixed value, 9MPa, 45MPa in the horizontal direction, and perform plastic analysis to simulate the underground stress state. After the stress environment is stable, excavate the set roa...

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Abstract

The invention relates to a mining stress study, in particular to a method for migrating and quantitating roadway surrounding rock strain energy under the action of excavation unloading, comprising: establishing a roadway excavation model by means of numerical simulation, simulating an excavation unloading process of field rock, monitoring mechanics and deformation of the surrounding rock under the action of excavation unloading, and providing data basis for constructing a roadway surrounding rock strain energy migration and quantitation scheme under the action of excavation unloading. The method for migrating and quantitating roadway surrounding rock strain energy under the action of excavation unloading provided herein experiences a successive process of 'high speed, low speed and high speed' based on energy migration speed, providing effective measures to prevent and treat roadway surrounding rock instability. It is possible to block energy migration in 'low speed' phase, energy gathering in the range is multiply released by taking certain measures, and it is possible to effectively solve the gathering problem of energy in a surrounding rock instable area, reduce occurrence of disasters and guarantee smooth progress of a project.

Description

technical field [0001] The invention relates to a research on mining stress, in particular to a method for quantifying strain energy migration of roadway surrounding rock under the action of excavation and unloading. Background technique [0002] With the development of my country's mineral resources mining to the deep, more and more underground projects are facing many disasters such as rockbursts. In underground engineering, the excavation of the roadway makes the complete rock mass appear empty, breaking the original stress environment. During the stress adjustment process, the energy is also transferred. The root cause of the instability of the surrounding rock of the roadway is caused by the release of elastic strain energy. [0003] During the excavation of tunnels in underground engineering under high-stress conditions, the excavation of rock mass will release the stress quickly, resulting in a strong dynamic effect, resulting in the loosening of surrounding rocks an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/00
CPCG01N19/00
Inventor 刘祥鑫张艳博姚旭龙梁鹏
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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