高速公路偏压连拱隧道施工方法数值模拟

Numeric Simulation for Construction Method of Biased Doublearch Tunnel of Expressway

对神土隧道的工程地质以及水文地质进行了介绍,采用有限元法对其进行了偏压连拱隧道施工力学行为分析。结果表明:采用三导洞配合台阶法施工是可行的;中墙在地表偏压和不对称施工条件下是稳定的,不会产生过大的倾斜:在施工中及时施作初期支护有利于控制围岩的变形,保证围岩的稳定和施工的安全。

The engineering geology and hydrogeology of Shentu Tunnel are introduced, and the mechanical behavior of construction of biased double-arch tunnel is analyzed using finite element method. The result indicates that construction with bench method along with three pilot headings is feasible, middle wall remains stable in condition of biased and asymmetric surface and no extra-large incline will be made. Initial support during construction helps to control the deformation of surrounding rocks, guarantee the stability of surrounding rocks and safety of construction.