动静载作用下隧道及周围岩土体响应分析

Response Analysis of Tunnels and Surrounding Rock Mass under Dynamic and Static Load

隧道在动静载作用下的响应结果对于分析隧道稳定性具有重要意义.以云湖2号公路隧道为研究对象,利用FLAC3D数值模拟软件对其进行分析.研究表明:静载作用下拱顶及水平监测点收敛位移与现场监测位移基本一致,验证了计算模型的可靠性;动载作用下拱底隆起位移增大至90.12mm,相对于静载时增大64.27mm,拱顶沉降位移由静载时的25.12mm减小至5.26mm;随着动荷的传递,隧道周围3.5m范围内逐渐出现新的剪切破坏和拉剪破坏,并主要发生在仰拱下部位置.

The response of tunnels under dynamic and static loads is of great significance to analyze the stability of tunnels. It is analyzed by FLAC3D numerical simulation software. The results show that, under the static load, the displacement of the horizontal monitoring point is consistent with the field monitoring displacement, and the reliability of the model is verified. Under the dynamic load, the arch uplift displacement increases to 90.12mm, increases by 64.27mm compared with the static load, and the time of 25.12mm is reduced to 5.26mm. With the transmission of dynamic load, the new shear failure and shear failure occur within 3.5m of the tunnel, and mainly occur in the lower part of the arch.