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Rockburst active control method based on blasting excavation disturbance control

An active control and disturbance control technology, applied in the field of geotechnical engineering, can solve the problems of neglecting the control of the transient release of the strain energy of the deep rock mass, and being unsuitable for deep buried underground engineering. The method is simple and easy to implement and the control effect is good. Effect

Active Publication Date: 2014-12-03
WUHAN UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the blasting excavation disturbance control method suitable for shallow underground projects only considers the control of dynamic disturbance induced by blast loads, and ignores the control of transient release of strain energy in deep rock mass, so it is not suitable for deep underground projects

Method used

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  • Rockburst active control method based on blasting excavation disturbance control
  • Rockburst active control method based on blasting excavation disturbance control
  • Rockburst active control method based on blasting excavation disturbance control

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A deeply buried circular tunnel is excavated in an infinite mountain. The diameter of the tunnel face is D=5m. The horizontal initial stress λp of the tunnel face is the large principal stress, and the vertical initial stress p is the small principal stress, λ is the lateral pressure coefficient, λ≥1, and the full-section blasting excavation is formed. The middle part of the face is cut with straight holes. From the inside to the outside, 2 circles of cut holes, 4 circles of caving holes, and 1 circle of surrounding light blasting holes are arranged in sequence on the excavated face. The conventional detonation networking method of light blasting blastholes is: connect the blastholes into a circle to obtain 7 differential initiation sections of MS1, MS3, MS5, MS7, MS9, MS11, and MS13, see figure 1 shown.

[0037] If the micro-differential detonation is carried out according to the above-mentioned network connection, a full-circle excavation profile surface will be form...

Embodiment 2

[0040] see image 3 , a deep-buried city gate tunnel is excavated in an infinite mountain, the diameter of the tunnel face is D=5m, the horizontal initial stress λp is the major principal stress, the vertical initial stress is p, the minor principal stress, and λ is the lateral pressure Coefficient, λ≥1, full-face blasting excavation forming. According to the drilling and blasting design scheme centered on single shot charge control, cut holes, caving holes and surrounding light blasting blasting are arranged on the face. Connect the blastholes into 9 differential detonation sections, MS1, MS3, MS5, MS7, MS9, MS11, MS13, MS15, MS17 as shown in 3.

[0041] If the detonation is carried out according to the above-mentioned network connection and the differential detonation is carried out, when the differential detonation sections MS5, MS7 and MS11 are detonated, a city gate excavation profile will be formed in the rock mass, and the normal ground stress on this new profile surfa...

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Abstract

The invention discloses a rockburst active control method based on blasting excavation disturbance control. The rockburst active control method aims at overcoming the shortcoming that only blast load induction disturbance is considered in traditional blasting disturbance control, the rock mass strain energy release amount caused by single-section blasting is reduced by changing blasthole arrangement and an explosion initiation network, so that the goal of weakening overall release rate of rock mass strain energy is achieved on the basis of controlling blast load induction disturbance to achieve control of deep rock mass excavation disturbance, and active control of rockburst is achieved finally. The rockburst active control method is suitable for blasting excavation construction of deeply buried underground engineering in the fields of hydraulic and hydro-power engineering, traffic and mines and the like.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to an active rockburst control method based on blasting excavation disturbance control. Background technique [0002] Rockburst is an engineering geological problem often encountered in the excavation process of underground engineering with high ground stress, and it is a dynamic failure phenomenon of surrounding rock induced by human activities. Since the rockburst phenomenon was first discovered in the British tin mine tunnel in 1738, rockburst has become a geological disaster that is generally concerned in the field of underground engineering. Many engineering practices at home and abroad have shown that rockburst has three characteristics: hysteresis, face tracking and repetition. The hysteresis feature means that rock bursts often occur within 5 to 20 hours after the blasting excavation is completed, lagging behind the excavation process; the tracking face fea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D3/04F42D1/00
Inventor 严鹏卢文波李涛陈明周创兵姜清辉
Owner WUHAN UNIV
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