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An Optimal Design Method for Cutting Blasting under High Ground Stress Condition

A high ground stress, optimized design technology, applied in blasting and other directions, can solve problems such as the difficulty of cutting and blasting excavation in deep rock mass, and achieve the effect of reducing the probability of occurrence

Active Publication Date: 2018-07-31
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a method for optimal design of cutting blasting under high ground stress conditions, making full use of the crack cracking direction and law between the cutting blast holes in the deep rock mass cutting blasting, Solve the problem of difficult excavation by deep rock mass cutting blasting

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  • An Optimal Design Method for Cutting Blasting under High Ground Stress Condition
  • An Optimal Design Method for Cutting Blasting under High Ground Stress Condition
  • An Optimal Design Method for Cutting Blasting under High Ground Stress Condition

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0023] The deep rock mass needs to be excavated by blasting. Due to the high ground stress during the blasting process, it is difficult to excavate the deep rock mass by conventional cutting blasting. An important factor in the difficulty of cutting and blasting excavation in deep rock mass. In order to make the cutting and blasting go smoothly, it is necessary to solve this problem.

[0024] In this field, when two blastholes are detonated at the same time, the rock around the blasthole first undergoes compressive failure under the action of the shock wave, and then the rock undergoes tensile failure under the action of the tangential tensile stress derived from the stress wave. The cracks in ...

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Abstract

The invention discloses a cutting blasting optimization design method under the condition of high ground stress. The direction of the principal stress and the minimum principal stress is designed as a rhombus cut blasthole, the long diagonal of the rhombus is in the same direction as the maximum principal stress, and the short diagonal of the rhombus is in the same direction as the minimum principal stress; 3) According to the rhombus cut blasthole 4) detonate the external cutout hole, then detonate the explosive in the empty hole to play the effect of throwing the rock mass. The beneficial effect achieved by the present invention: through the design of the cutting hole and the central hole, the difficulty of rock mass cutting and blasting under high ground stress can be overcome, and it can relieve the pressure of the deep rock mass, so that some internal energy of the rock mass can be prematurely released. Release can help reduce the probability of rockbursts.

Description

technical field [0001] The invention relates to an optimal design method for cutting blasting under high ground stress conditions, and belongs to the technical field of deep rock mass blasting. Background technique [0002] In water conservancy and hydropower, transportation and mining projects, the drilling and blasting method is used to excavate deep rock mass. It is difficult to excavate deep rock mass by blasting. According to the existing research, the magnitude of the ground stress and the damage anisotropy caused by the difference between the maximum principal stress and the minimum principal stress are the main reasons for the difficulty of deep rock mass cutting and blasting excavation. Due to the large buried depth of the deep rock mass, in addition to the self-weight stress, it is also subjected to structural stress. Usually, the rock mass is subjected to non-hydrostatic pressure. At this time, it is difficult to excavate the deep rock mass by cutting and blastin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D3/04
Inventor 谢理想杨圣奇顾金才田文岭张鹏超陶焱李旭
Owner CHINA UNIV OF MINING & TECH
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