节理岩体地下洞室稳定性的静动力响应分析

节理岩体地下洞室在地震作用下的安全响应是众多专家学者关注的问题之一,本文针对该问题采用三维离散元法研究节理地下洞室的稳定性,建立了一个含节理组的地下洞室模型进行分析研究。分别对洞室开挖后在常规荷载作用下的响应、洞室开挖后在地震荷载作用下的响应以及开挖支护后在地震荷载作用下的响应等三种工况进行模拟,得出了洞室在三种工况下的应力和位移变化情况。研究表明:地震对洞室的破坏非常大且时间短暂,支护后的洞室围岩能够使破坏时间延迟,在一定时间内增强了洞室围岩的抗震能力。本文的工作不仅对含节理的地下洞室开挖后的围岩变形和支护提供借鉴,而且对地下洞室和隧道的抗震设计具有指导意义。

Static and Dynamic Response Analysis on Stability of Underground Cavern with Joints

The safety response of jointed rock in underground caverns is one of the problems that draw the attention of geology specialists and scholars. Adopting three-dimensional discrete element method, a numerical model of jointed rock underground cavern was established to study its stability. The safety response after excavation is simulated respectively under the routine loads, seismic loads and seismic loads with bolting support. The variation of stress and displacement under these three conditions are obtained. The research shows that the damage from earthquake to caverns is huge and quick while bolting support can postpone the destruction of the cavern and increase the resistant capability of the cavern in certain period of time. The result can provide reference to the study of the deformation and bolting of underground caverns, and can be directive to the seismic design of underground caverns and tunnels.