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Stress wave propagation and incompatible deformation mechanisms in rock discontinuity interfaces in deep-buried tunnels

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Deep Underground Science and Engineering 2022年第1期1卷 25-39页

作者： Cong Zhang Zhende Zhu Shanyong Wang Xuhua Ren Chong Shi State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjingChina Priority Research Center for Geotechnical Science and Engineering The University of NewcastleCallaghanNew South WalesAustralia Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjingChina

Complex weak structural planes and fault zones induce significant heterogeneity,discontinuity,and nonlinear characteristics of a rock *** an earthquake occurs,these characteristics lead to extremely complex seismic wave propagation and vibrational behaviors and thus pose a huge threat to the safety and stability of deep buried *** investigate the wave propagation in a rock mass with different structural planes and fault zones,this study first introduced the theory of elastic wave propagation and elastodynamic principles and used the Zoeppritz equation to describe wave field decomposition and develop a seismic wave response model ***,a physical wave propagation model was constructed to investigate seismic waves passing through a fault,and dynamic damage was analyzed by using shaking table ***,stress wave attenuation and dynamic incompatible deformation mechanisms in a rock mass with fault zones were *** results indicate that under the action of weak structural planes,stress waves appear as a complex wave field decomposition *** a stress wave spreads to a weak structural plane,its scattering may transform into a tensile wave,generating tensile stress and destabilizing the rock mass;wave dynamic energy is absorbed by a low-strength rock through wave scattering,which significantly weakens the seismic *** propagation accelerates the initiation and expansion of internal defects in the rock mass and leads to a dynamic incompatible *** is one of the main causes for large deformation and even instability within rock *** findings provide an important reference and guide with respect to stability analysis of rock mass with weak structural planes and fault zones.

关键词： deep-buried tunnels fractured rock mass incompatible deformation mechanism rock interfaces stress wave propagation model

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