软弱岩层大跨度地铁车站施工优化与地表沉降控制

 针对修建大跨度地铁车站的工法优化对地表沉降的影响，首先应用数值模拟方法对5种工法进行优化比选，初步确定8步工法为最优工法，然后应用模型试验验证该工法。对比分析表明，2种方法所得结果吻合良好，即5种工法都能满足地表沉降控制和结构稳定性要求，其中8步工法比其他4种工法的地表沉降控制效果和结构受力状况更优，其关键工序是第14道工序。

OPTIMIZATION OF LARGE-SPAN METRO STATION CONSTRUCTION IN SOFT ROCK STRATA AND CONTROL OF GROUND SURFACE SUBSIDENCE

In view of the influence of ground surface subsidence due to the optimization of construction methods of large-span metro station in soft rock strata,numerical simulation is firstly used to optimize and compare five construction methods;and the eight-step method is selected tentatively as the optimized one. Then the similar material model test is conducted to verify it. The results turn out to be perfectly matched by comparison and analysis,and it is found that five construction methods are able to meet the needs of controlling ground surface subsidence and keeping structural stability,in which the eight-step method is more optimized in terms of the control effect of ground surface subsidence and the state of structural stress;and that the key is the working procedure No.14.