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地铁交通建设在城市建设中占有重要地位,而地铁隧道不免要下穿城市已有建(构)筑物,此时如何控制上层建(构)筑物沉降便成了施工中需解决的首要问题。青岛地铁万年泉路站—李村站之间的隧道下穿多座沿街建筑,且隧道拱部以上为砂土体,含水丰富,下部为中风化岩体,处于上软下硬的特殊地层。以此为工程背景,模拟分析隧道开挖对地表建筑物沉降产生的不利影响,并结合现场地质环境及施工条件提出WSS超前注浆加固地层法,对其施工工序进行数值模拟。最终对比现场位移监测数据,证明该注浆法加固减沉的有效性,可为解决类似工程问题提供参考。
Subway traffic construction plays an important role in the construction of the city. Subway tunnels inevitably have to pass through existing structures in the city. How to control the subsidence of superstructures has become the primary problem to be solved in construction. . The tunnel between Wannianquan Road Station and Licun Station of Qingdao Subway is pierced by a number of buildings along the street and the sandstone above the arch of the tunnel is rich in water and the lower part is a weathered rock mass, . Taking this as the engineering background, the unfavorable influence of tunnel excavation on settlement of surface buildings was simulated and analyzed, and the WSS advanced grouting method was put forward to simulate the construction process with the combination of on-site geological environment and construction conditions. Finally, the field displacement monitoring data is compared with that of the grouting method to prove the effectiveness of the grouting method in strengthening the settlement, which can provide reference for solving similar engineering problems.