Research on Surface Subsidence of Long-Span Underground Tunnel

In the process of urban rail transit construction, underground excavation method is often used in subway station construction. Based on a large number measured data Qingdao Metro Line 3, this paper analyzes and studies ground subsidence law long-span shallow buried station. The research results show that vertical surface settlement will be caused by both sides guide hole, but relatively small, basically within −10 mm. Large occur during middle or hole excavation, with up to −30 Through fitting, it found regression analysis using cubic polynomial one degree can get better fitting effect. horizontal variation rules stations are affected tunnel depth, geological conditions, management level monitoring units, layout accuracy, so on. differences deformation between large. Wannianquan Road Station conforms trough Peck, Junfeng directly above belongs whole type. This study has accumulated data, which provide certain reference for subsequent design similar lines.