Range Determination and Deformation Failure Mechanism of Loosening Zone of Surrounding Rock in Deep Engineering

Abstract:

As the burial depth increases， the stress redistribution of surrounding rock in deep engineering forms a supporting pressure zone after excavation， and a new fracture surface will be formed after failure. The stable support pressure zone is the loosening zone of the surrounding rock. The determination of the scope of the loosening zone of the surrounding rock and the study of the deformation and failure mechanism are related to the methods of the deformation stability control and support of the surrounding rock. In this paper， the equilibrium equation of the surrounding rock and the Taylor expansion method are used to obtain the initial radius of the loose zone， the Maxwell equation is used to characterize the evolution of defect stress in the rock mass， and the conditions for the cracking and failure of the loose zone of the surrounding rock are derived. The research results are of guiding significance to the stability analysis of underground roadways and the design of surrounding rock support.

Key words:support pressure zone;surrounding rock loose circle;partition fracture of surrounding rock