Dynamic elastic modulus detection method of large-span underground cavity mining roof stability

Abstract

The invention belongs to the technical field of large-span underground engineering mining stability prevention and treatment, and particularly relates to a dynamic elastic modulus detection method ofthe large-span underground cavity mining roof stability. The dynamic elastic modulus detection method comprises the following steps that 1, physical and mechanics parameters of underground cavity rockmass are determined; 2, initial ground stress of the central axis of an underground cavity roof and ground stress in the dynamic process are determined; 3, an initial rock mass dynamic elastic modulus of a detection profile of the underground cavity roof and the rock mass dynamic elastic modulus in the dynamic process are detected; 4, roof damage variables after different excavation stages of anunderground cavity are determined; 5, a criterion of the underground cavity roof structural stability is determined; and 6, evaluation of the underground cavity roof stability and a safety limit of anexcavation span of the underground cavity roof are determined. According to the dynamic elastic modulus detection method, the dynamic modulus of elasticity of the rock mass underground cavity roof ismeasured through hole drilling, the parameter of the dynamic modulus of elasticity serves as a parameter of large-span underground space mining roof stability evaluation, the dynamic stability, the strength and the like of the large-span underground cavity mining roof under the effect of external dynamics are evaluated and predicated by applying the parameter, and a quantitative basis can be provided for optimization design of the large-span underground space mining roof.

Description

technical field [0001] The present invention relates to the technical field of large-span underground engineering mining stability prevention and control, and in particular relates to a dynamic-elastic model detection method for the stability of a large-span underground chamber mining roof. Background technique [0002] With the rapid development of my country's economy, large-span underground engineering has been continuously applied in water conservancy and hydropower, transportation, energy storage, military and other industries. At present, my country's largest-span underground engineering has exceeded 5 kilometers. my country is a big country in the construction of long-span underground engineering, but the design of large-span underground engineering is still in the stage of experience and exploration. For the stability of underground engineering with large buried depth, large span, and complex engineering geological conditions, it is an important issue for the existing...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a dynamic elastic model detection method for the stability of the roof of the large-span underground chamber mining. The method aims at the limitation of the current analysis method of the roof stability of the large-span underground space mining, and measures the dynamic and elastic model of the roof of the underground chamber of the rock mass by drilling. Elastic modulus, the parameter of dynamic elastic modulus is used as the evaluation parameter of the roof stability of large-span underground space mining, and the dynamic stability and strength of the roof of large-span underground chamber mining are evaluated and predicted by using this parameter, and It can provide quantitative basis for the optimal design of the mining roof of large-span underground space

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