盾构近距离穿越已建隧道的施工影响分析

Analysis of construction influence of shield tunnel machine passing over old nearby tunnels

随着城市地铁的持续建设,近接既有地下建筑进行施工的工程大量涌现。由于受地质条件和施工工艺的限制,盾构推进难免会对邻近建(构)筑物产生扰动,由此引发一系列的环境病害。针对过黄浦江行人观光隧道从上部穿越刚刚建成的上海地铁2号线越江区间隧道,建立了三维有限元计算模型,研究了由于盾构推进而引起的地层扰动变形的规律性,并对已建隧道产生的施工影响进行了分析,并给出了相关的结论。

With the construction of metro lines in cities, there are more and more cases of shield tunnel machine passing through old nearby buildings. Due to the constraints of geological conditions and construction techniques, the advance of shield tunnel machine will cause disturbance to these buildings, bringing series of environmental calamities. A sightseeing tunnel will pass over old nearby Metro line No.2 under Huangpujiang River. The 3D numerical model for this case is established. According to the calculation result, the law of stratum movement and influence of the construction on the below old nearby Metro line are analyzed. At the same time, some useful conclusions are drawn.