Research on the Deformation Law and Progressive Failure Mechanism of Horizontal Layered Surrounding Rock
The layered rock mass is affected by the structural plane,and its failure mode and failure mechanism are obviously different from other rock masses.The stability of surrounding rock is a prominent problem when con-structing a tunnel in the layered rock mass.Taking the Dongfeng Road Tunnel as the background,the failure mode and progressive deformation and failure mechanism of the surrounding rock of the tunnel in the layered rock mass are studied.Conclusions are as follows;the influence factors of the stability of the surrounding rock of the tunnel in the horizontal layered rock mass mainly include geological factors,construction factors and engineering factors;the deformation and failure modes of the horizontal layered rock mass are mainly bedding slip failures and bending fail-ures;the progressive deformation and failure of layered surrounding rock have typical layer-by-layer progressive evolution characteristics:the rock strata near the initial free condition preferentially separates and then collapses layer by layer,and the span of the collapse failure decreases layer by layer until equilibrium and finally forms the failure mode of the trapezoidal arch.
Layered rock massTunnel surrounding rockFailure modeFailure mechanism
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