地质条件对隧道地震响应的影响因素研究

地质条件对隧道的地震响应的影响因素研究,目前已有较多研究者开展,但多数研究者关注单因素研究,但对多因素及各因素间相互作用关注较少。本文以华丽高速公路典型隧道为工程背景,将其抽象为数值算例,并基于正交设计及均匀设计等试验方法,分别研究地质条件中岩体的力学效应、应力状态效应、结构面的力学效应对隧道的影响。研究结果表明:对于岩体力学参数,除开挖变形指标的主要影响因素为变形模量外,岩体力学参数中对隧道地震响应最主要的影响因素为黏聚力及内摩擦角,即强度参数;岩体应力状态参数中对隧道地震响应最主要的影响因素为隧道埋深,其次分别为平面内侧压系数和平面外侧压系数;节理力学参数中的摩擦角和抗拉强度为影响隧道地震响应的主要因素,其次为黏聚力、法向刚度、切向刚度。

Influence of Geological Conditions on the Seismic Response of a Tunnel

Extensive research has been conducted on the influence of the geological conditions on the seismic responses of tunnels. However, most existing work has focused on the influence of single parameters. Less emphasis has been place on the influence of multiple parameters and the interactions between them. In this paper, we consider the influences of geological conditions on a typical tunnel of the Huali expressway project. Using orthogonal and uniform design methods, we studied the influences of various geological parameters, including the mechanical parameters of the rock mass, the in-situ stress state of the rock mass, and the mechanical parameters of the joints. The results indicate that the main factor influencing the excavation deformation index is the deformation modulus. Regarding the mechanical parameters of the rock mass, the main factors influencing the tunnel seismic response were found to be the cohesion and internal friction angle. Regarding the stress-state parameters of the rock mass, the main factor influencing the seismic response of the tunnel was determined to be the tunnel depth, followed by the in-plane and out-of-plane lateral pressure coefficients. Among the joint mechanical parameters, the friction angle and tensile strength were identified as the major influence factors.