地铁隧道开挖下穿建筑物段引起地表沉降的控制效果研究

Research on control effect of ground surface settlement caused by excavation of subway tunnel going under constructions

为防止处于复杂地层条件下的地铁隧道施工下穿建筑物段引起地表沉降对建筑物产生不利影响,对复杂地层采取预加固措施的可行性进行研究,设定无预支护、全断面注浆预支护、大管棚预支护、全断面注浆与大管棚联合支护四种工况,利用MADIS-GTS建立隧道-建筑物三维有限元模型进行模拟,分析各工况下对地表及建筑物的沉降控制效果,并与相关控制标准对比分析。结果表明:大管棚和全断面注浆联合支护方能达到最佳支护效果,保证地铁隧道开挖安全顺利进行。

In order to avoid the adverse effects of ground surface settlement on the buildings caused by the construction of subway tunnel going under buildings in complex stratum conditions,the feasibility of taking pre-reinforcement measures for complex strata was studied. First of all,four kinds of support conditions are set up： non-pre-support,full section grouting pre-support,large pipe shed pre-support and combined support of full section grouting and large pipe shed. The three-dimensional finite element model of tunnel-building is built by using MADIS-GTS for simulation,the settlement control effects of ground surface and building under different working conditions are analyzed and compared with the relevant control standards. The results show that the combined support with large pipe shed and full section grouting has the best supporting effect and can ensure the safe and smooth excavation of the metro tunnel.