道路荷载及地下水渗流对盾构隧道围岩稳定性影响

以郑州航空港线地铁为工程实例，基于FLAC3D的有限差分的数值模拟方法，模拟分析了道路荷载下盾构隧道施工过程中围岩稳定情况，并分别采用不考虑地下水和考虑地下水渗流分析时，围岩稳定性的异同，分别从洞室水平竖向变形以及地面沉降等方面对比了围岩的稳定情况，重点分析了盾构隧道施工过程中围岩变形及对既有高速公路的影响和地下水对盾构隧道施工过程中围岩稳定性的影响，为盾构隧道的施工提出了建议。

Study on Influence of Road Load and Ground Water Seepage on Rock Stability Surrounding Shield Tunnel

Taking the project of Zhengzhou Metro for Airport Economy Zone as the example, herein on the basis of FLAC3D finite difference numerical simulation the rock stability surrounding the shield tunneling under road load was analyzed, and both the difference of rock stability with and without taking the seepage analysis of ground water into consideration and the situations of rock stability from the aspects of the horizontal and vertical cavern deformation and the ground subsidence, were compared respectively. The emphasis was laid on both the influence of surrounding rock deformation on the existing highway and the influence of ground water on the rock stability in the shield tunneling. Thus the suggestions to the constructions of shield tunnel were provided.