Study on deformation and failure characteristics of deep roadway surrounding rock under excavation unloading disturbance

doi:10.16265/j.cnki.issn1003-3033.2021.08.012

Abstract

Abstract: In order to solve problem of surrounding rock instability, deformation and stress failure of deep roadway under disturbance of excavation unloading engineering. Typical deformation characteristics of deep roadway surrounding rock under unloading disturbance were analyzed by adopted analytic hierarchy process(HAP), mathematical calculation and numerical simulation, comprehensive evaluation system of surrounding rock instability was established, as well as space-time evolutionary characteristics of surrounding rock fracture field, stress field and displacement field were obtained. The results show that surrounding rock disturbed by deep excavation has double typical deformation characteristics of internal unloading instability and external nonlinear deformation. Coupling effect of vertical stress and horizontal stress causes deformation and failure of surrounding rock. Surrounding rock of deep excavation roadway has characteristics of large initial deformation, rapid displacement change and strong rheology. Roof subsidence and floor heave are significant characteristics of surrounding rock instability and deformation.

Key words: excavation unloading, deep roadway, instability deformation, evaluation system, stress field, coupling effect

CLC Number:

X936

WANG Xinfeng, HE Yi, LU Mingyuan, GAO Yuhao, LI Shan. Study on deformation and failure characteristics of deep roadway surrounding rock under excavation unloading disturbance[J]. China Safety Science Journal, 2021, 31(8): 83-90.

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