深埋长大隧道渗流数值模拟

隧道工程凸现长、大、深、难的特点。地下水对隧道施工构成威胁，并引起诸如塌方、冒顶、突水等工程问题。地下水赋存具有离散性，渗流具有筹向异性等特点。依托甘肃省最长公路隧道——新七道梁隧道工程，应用岩体非连续介质渗流的研究成果，进行最大涌水区段渗流数值模拟。模拟各种工况条件下地下水的渗流特性以及地表水体的水位变化。与实测结果的对比表明，理论分析正确，计算结果可靠。

NUMERICAL SIMULATION OF SEEPAGE IN DEEP-BURIED LONG AND BIG TUNNELS

Characteristics of tunneling engineering tend to be long, big, aeep-buried and difficult.Seepage in tunnels threatens large-scale underground excavation, and gives rise to engineering troubles such as landslide, roof caving, water bursting, etc. The characteristic of groundwater occurrence is discrete and seepage is anisotropic. Relying on the longest highway tunnel in Gansu Province, Qidaoliang Tunnel, based on the achievements from non-continuum seepage in rock mass, seepage fields in the area with the maximum flow rate inflow into the tunnel is simulated numerically. Properties of the groundwater seepage in the tunnel and changes of the surface waters level are simulated under all kinds of conditions. Comparison between the simulated results and the measured ones shows that the theoretical analysis is correct and the calculating results are reliable.