Underground engineering surrounding rock-stress double-target mutual feedback joint regulation and control method

Abstract

The invention belongs to the technical field of underground engineering design, and particularly relates to an underground engineering surrounding rock-stress double-target mutual feedback combined regulation and control method. According to the underground engineering surrounding rock-stress double-target mutual feedback joint regulation and control method provided by the invention, the cracking coefficient CDI of a local cracking instability area, the pressure equalizing coefficient PEI of a stress concentration disturbance area and the bearing coefficient BCI of a stress balance protolith area of surrounding rock are calculated and obtained through in-situ drilling television camera, a rock stress meter and an acoustic wave testing technology on the section of the underground engineering; and the excavation layering height of the underground engineering and the supporting types, supporting opportunities and supporting lengths of three key links of shallow supporting and surface fixing, ring expanding and cost strengthening and combined bearing are determined, the completeness degree of shallow surrounding rock and the deviation stress increasing degree of deep surrounding rock are actively controlled, and the overall bearing capacity of the shallow surrounding rock and the overall bearing capacity of the deep surrounding rock are fully exerted.

Description

technical field [0001] The invention belongs to the technical field of underground engineering design, and in particular relates to an underground engineering surrounding rock-stress dual-objective mutual-feedback joint control method. Background technique [0002] The new Austrian method and the new Italian method are widely used in the excavation and support design of underground engineering caverns in my country. At present, there are underground engineering design methods that emphasize timely support after excavation, maintain the integrity of the surrounding rock to the greatest extent, and give full play to the surrounding rock. self-supporting capacity. [0003] However, studies have shown that the instability of surrounding rock in underground engineering is mainly caused by brittle fracture of rock mass under high stress, and the fracture of surrounding rock is a gradual process of continuous damage accumulation. And the results of penetration, and the different st...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an underground engineering surrounding rock-stress dual-objective problem based on the problem that the stress transfer characteristics of the underground engineering surrounding rock cannot be fully quantified and the self-bearing capacity of the deep surrounding rock cannot be fully mobilized in the prior art. Mutual-feedback joint control method

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