深基坑开挖对武汉长江隧道影响数值模拟

Numerical Simulation of Influence of A Deep Foundation Pit Excavation for Wuhan Yangtze River Tunnel

摘要:

以临近武汉长江隧道的华电集团华中总部研发基地基坑项目为研究对象，采用岩土、隧道结构专用有限元分析软件 MIDAS/GTS NX对该基坑施工过程中的9个施工工况进行模拟，得到基坑开挖完成后的地层、连续墙、隧道变形情况以及基坑开挖前后的隧道应力情况，并进行分析，得出模型的建立是合理可行的，且基坑开挖、支护变形带动坑外土体位移，引起临近基坑侧隧道产生水平位移最大值为4.17 mm；隧道的应力值与基坑开挖前的变化不大，在安全范围内。

Abstract:

Taking some foundation pit project of huadian group huazhong headquarters R&D base adjacent to the Wuhan Yangtze River tunnel as the research object, the finite element analysis software MIDAS/GTS NX of rock and soil structure was used to simulate the nine construction conditions during the construction of the foundation pit. The deformation of formation, diaphragm wall, and tunnel after the completion of the foundation pit excavation and the tunnel stress before and after foundation pit excavation, were obtained and analyzed. The results show that it was reasonable and feasible to establish the model; the foundation pit excavation and support soil produced the soil displacement outside the pit which caused the maximum 4.17mm horizontal displacement of the tunnel near the foundation pit; the stress value of the tunnel and the change before the excavation of the foundation pit were not significant and within the safe range.