Underground cavern stability evaluation method based on double safety of rock mass and supporting structure

Abstract

The invention provides an underground cavern stability evaluation method based on double safety of a rock mass and a supporting structure, which mainly combines surrounding rock relaxation depth, surrounding rock deformation, anchor cable load and anchor rod stress to establish a multi-index rock mass and support structure double safety control standard, and combines monitoring data, numerical inversion analysis, field test results and the like to evaluate stability of an underground cavern. Specific standards of various indexes of a safety, early warning and danger three-level early warning standard system are respectively established, and the safety early warning control indexes determined by the method can be dynamically adjusted and updated according to the whole engineering construction process, so graded early warning can be performed on the whole underground engineering in stages and parts in the whole process.

Description

technical field [0001] The invention relates to the technical field of stability evaluation of underground caverns under rock mass conditions in industries such as transportation, water conservancy, hydropower, nuclear power, and nuclear waste storage, and specifically refers to a quantitative evaluation method for the stability of surrounding rocks in underground caverns and the stress safety of supporting structures. Background technique [0002] my country will usher in a new round of engineering construction in many fields such as new energy, hydropower, urban construction, national defense and security. Underground space resources such as hydropower station underground caverns, carbon dioxide underground storage, nuclear waste underground storage, national defense hangars, underground oil depots, etc. The development and utilization of will become more and more common. [0003] According to different construction needs, the geological environment of underground caverns i...

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Problems solved by technology

[0004] Therefore, it is very important to establish a hierarchical early warning system based on relevant information for underground caverns that can reflect both the stability of the surrounding rock and the safety margin of the support system, and establish corresponding detailed evaluation indicators. The classification and early warning system for the stability of the surrounding rock of the chamber mainly focuses on a few indicators of the surrounding rock's own response, such as deformation and deformation rate, and does not reflect other factors such as the relaxation depth of the surrounding rock, the stress of the anchor rod, and the load of the anchor cable, which affect the overall safety of the underground cavern. index

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