冲沟走向对大跨软岩隧道稳定性影响研究

Study on the effect of gully direction on the stability of large-span tunnel in soft rock

以集呼高速旗下营隧道为依托,建立了隧道三维有限元模型,数值研究了不同冲沟走向对隧道围岩稳定性的影响,结果表明,较横向冲沟而言,冲沟走向平行隧道走向时,冲沟对隧道围岩拱顶沉降和周边收敛的影响较大,施工过程中应加强拱顶沉降的监测工作,以保证隧道施工过程中的稳定性。

In this paper,based on the Qixiaying tunnel at Ji-Hu expressway,three dimensional finite element models of the tunnel is established,and the effect of different gully directions on the stability of large-span tunnel in surrounding rock are investigated numerically.The results show that,when the gully direction is parallel to the tunnel orientation,the gully has an even bigger effect on the crown settlement and peripheral displacement convergence of the tunnel surrounding rock mass than the transverse gully.Monitoring of the crown settlement should be strengthened to ensure the tunnel stability during construction.