地铁隧道受平行向地裂缝错动影响数值分析

西安地铁3号线局部地段通过f7地裂缝上盘,并且和f7地裂缝近似平行。基于f7地裂缝长期水准监测预测的未来最大活动量值,采用数值方法,研究了西安典型的黄土、古土壤和粉质黏土地层下地铁隧道受平行向地裂缝活动的影响。通过逐渐变化地铁隧道衬砌外皮同地裂缝间的距离,计算了6种工况下地铁隧道衬砌的变形和内力。计算结果表明:当地铁隧道衬砌外皮距离地裂缝30m时,隧道衬砌是安全,并有一定的安全储备。

NUMERICAL ANALYSIS OF DISLOCATION OF GROUND FISSURE ON THE METRO TUNNEL PARALLELING TO THE GROUND FISSURE'S STRIKE

The Xi'an metro line 3 paralleling to the strike of f7ground fissure, pass through locally hanging wall of the f7ground fissure. Based on the maximum activity values forecasted by the level monitoring datum, the influence of dislocation of ground fissure on metro tunnel was researched which parallel to the f7ground fissure's strike, utilizing the numerical method. The dislocation of ground fissure occurs in characteristic loess soil strata which are compose of loess soil, paleosol and silty clay. By gradually changing the distance between the out layer of metro tunnel liner and the f7ground fissure, the deformation and stress of the metro tunnel liner was computed under six calculation conditions. The results show that the tunnel liner is safe and has safety margin to some extent when the distance is 30meters between the out layer of metro tunnel liner and the f7ground fissure.