地下水影响下隧道不同开挖方式的数值模拟*

(大连大学 土木工程技术研究与开发中心,辽宁 大连 116622)

流固耦合; 开挖方式; 涌水量; 稳定系数

Numerical Simulation of Different Tunnel Excavation Methods under the Influence of Underground Water
WU Kairong,WANG Guixuan,ZHAO Jie

(The R&D Center of the Civil Engineering Technology,Dalian University,Dalian 116622,Liaoning,China)

fluid-solid coupling; excavation method; water inflow; stability coefficient

备注

以大连某山体公路大跨度隧道为工程背景,基于流固耦合原理,考虑地下水影响下不同开挖方式对隧道开挖的影响,对涌水量、围岩位移、应力以及围岩稳定系数进行了对比分析。结果 表明:导洞法开挖引起的拱顶沉降是最小的,而拱底隆起和横向拱腰位移却是最大的,以自编的强度折减法程序计算出来的围岩稳定系数也是最大的,因此,相比于其他3种开挖形式导洞法更适合于富水条件下的大跨度隧道的开挖,为类似工程的设计和施工提供了一定依据。

Take a mountain tunnel project in Dalian as the engineering background,considering the influence of different excavation methods on tunnel excavation under the influence of the groundwater based on the principle of fluid-solid coupling,we compared and analyzed the water inflow,displacement,stress and stability coefficient of surrounding rock. The result show that the vault settlement induced by the drift method is minimum,however,the displacement of arched bottom uplift and lateral arch waist is maximum,and the calculated surrounding rock stability coefficient by using the self strength reduction procedure is maximum. Thus,compared to other three excavation form,excavating the large span tunnel under water rich conditions is more suitable by the drift method. The obtained result could provide a certain basis for the design and construction of the similar projects.