地下水位以下湿陷性黄土隧道基底加固

庞湾隧道位于固原市西吉县境内,隧道出口基底埋深位于黄土层中且位于地下水位以下,基底下黄土层厚约15m,施工困难。本文通过方案比选,数值模拟,多方面考虑选取湿陷性黄土隧道基地加固方式,解决隧道开挖易塌陷、变形等情况,使得隧道开挖得到顺利进行,增加了隧道开挖施工的安全性。

Pangwan Tunnel is located in Xiji County of Guyuan City.The exit of the tunnel is buried deep in the loess layer and below the groundwater level.The loess layer under the base is about 15m thick,making construction difficult.In this paper,through scheme comparison and numerical simulation,the reinforcement method of collapsible loess tunnel base is considered in many aspects to solve the problems of easy collapse and deformation during tunnel excavation,so that the tunnel excavation can proceed smoothly and the safety of tunnel excavation construction is increased.