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Strength-stress ratio rock burst criterion method considering tunnel surrounding rock stress distribution

A technology of strength-stress ratio and surrounding rock stress, which is applied in earthwork drilling, mining equipment, mining equipment, etc., can solve problems such as failure to comprehensively consider the stress size and distribution rockburst discrimination method, and achieve high rockburst prediction accuracy , Improve the level of prevention and control, and overcome the effect of inconsistent interval division

Active Publication Date: 2019-05-10
WUHAN UNIV OF TECH
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Problems solved by technology

At present, there is no rockburst discrimination method that comprehensively considers the magnitude and distribution of stress

Method used

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  • Strength-stress ratio rock burst criterion method considering tunnel surrounding rock stress distribution
  • Strength-stress ratio rock burst criterion method considering tunnel surrounding rock stress distribution
  • Strength-stress ratio rock burst criterion method considering tunnel surrounding rock stress distribution

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Embodiment Construction

[0027] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the embodiments.

[0028] A strength-stress ratio rockburst criterion considering the stress distribution of tunnel surrounding rock, the specific implementation steps are as follows:

[0029] Step 1: If figure 1 As shown, in order to consider the stress distribution, it is necessary to make a series of simplifications to the surrounding rock stress disturbance area. Theoretical analysis shows that the stress and displacement changes of the surrounding medium caused by the load release are less than 5% outside the three times the diameter of the tunnel. Therefore, it is assumed that three times the hole diameter is equal to the original rock stress.

[0030] Since the change rate of surrounding rock stress is not a constant value, in order to conveniently express the concent...

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Abstract

The invention discloses a strength-stress ratio rock burst criterion method considering tunnel surrounding rock stress distribution, which comprises the following steps: step 1, proposing a concept ofstress set degree, and giving a quantitative representation method of a surrounding rock stress set degree value; step 2, on the basis of a large number of engineering rock burst instances, combiningthe stress set degree parameters with the strength-stress ratio and the rock burst grade in the aspects of describing stress field disturbance and rock burst strength to obtain actually measured dataof the stress set degree, the strength-stress ratio and the rock burst strength, and representing the actually measured data in a two-dimensional plane determined by the strength-stress ratio and thestress set degree; and step 3, carrying out multi-parameter expression experience fitting, carrying out comprehensive quantitative expression on a fitting result, and establishing a more accurate andreasonable rock burst strength stress ratio criterion. The rock burst strength prediction method provided by the invention is simple and easy to implement, is convenient for practical engineering application, and has higher prediction precision, and the empirical relational expression can be used for design and construction guidance.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a strength-stress ratio rockburst criterion method considering the stress distribution of tunnel surrounding rock. Background technique [0002] There are more and more excavations of deep rock mass in high ground stress environment. As one of the major engineering geological problems of deep buried long tunnels, rockburst prevention and control problems will become more and more prominent. Accurate rockburst prediction is helpful to take corresponding engineering countermeasures in design and construction to reduce or avoid losses caused by rockburst disasters. At present, there are many research theories on rockburst, but various theoretical prediction methods based on rockburst theory and rockburst failure mechanism still have the problem of low accuracy in engineering applications. Research is of great significance. [0003] At present, rockburst...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/00
Inventor 夏元友刘夕奇吝曼卿霍梦喆杨俊超张兰何佳其
Owner WUHAN UNIV OF TECH
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