地铁车站改造降水对毗邻轨道交通的影响研究

为了将地铁星港街站与商业空间连接,须将星港街站进行改造,车站改造施工降水势必对临近地铁车站与隧道结构产生影响。基于ABAQUS软件与理论方法渗流算例计算结果的对比分析,验证了ABAQUS软件渗流计算的可靠性。考虑车站改造降水土中水渗流与应力的耦合作用,采用ABAQUS软件计算分析车站改造降水对毗邻地铁车站与隧道结构产生的变形与附加应力。结果表明:(1)车站结构底板产生的最大隆起变形为3.97 mm,最大不均匀沉降为3.01 mm,沉降变形曲率系数为1/21 096;隧道产生的最大隆起变形为0.92 mm,最大不均匀沉降为0.39 mm,沉降变形曲率系数为1/125 000。均在地铁车站结构、隧道结构变形控制范围之内。(2)车站改造降水引起车站、隧道结构的附加应力分别为519 kPa、209 kPa,不会对结构安全造成影响。研究成果为车站改造方案的优化与毗邻轨道交通安全运营影响的预测提供良好的理论依据。

Study on impact from dewatering for reconstruction of subway station on adjacent rail traffic

In order to connect the Xinggang Street Subway Station with the commercial space，the subway station is necessary to be reconstructed，and then the dewatering for the reconstruction is surely to impact the structures of the adjacent subway station and its tunnel. Based on the comparative analysis of the results of the seepage calculation case made with both ABAQUS software and the relevant theoretical method，the reliability of the seepage calculation made with ABAQUS software is verified. Under the consideration of the coupling effect of both the seepage and the stress in the dewatered soil mass during the reconstruction of the subway station，ABAQUS software is adopted to calculate and analyze the deformations and the additional stresses of the structures of the adjacent subway station and its tunnel caused by the dewatering for the reconstruction. The result shows that ( 1) the maximum uplift deformation of the bottom slab of the station structure is 3. 97 mm，the maximum uneven settlement is 3. 01 mm with the settlement deformation curvature coefficient of 1 /21 096，while the maximum uplift deformation of the tunnel is 0. 92 mm，the maximum uneven settlement is 0. 39 mm with the settlement deformation curvature coefficient of 1 /125 000; which are all within the control area of the structural deformations of both the subway station and its tunnel. ( 2) The additional stresses of the structures of the subway station and its tunnel caused by the dewatering for the reconstruction are 519 kPa and 209 kPa respectively，which cannot impact the safeties of the structures. The study result provides a better basis for optimizing the subway station reconstruction and predicting the safe operation of the adjacent rail traffic.