老采空区地表剩余变形对城市轨道交通的影响评价

为了评价煤矿老采空区地表剩余变形对城市轨道交通稳定性的影响，针对徐州轨道交通规划1号线，应用概率积分法建立闭合矩形积分模型，选取合理的计算参数，计算了研究区的地表剩余移动和变形。根据计算结果，绘制了地表剩余移动和变形等值线图，另外，分别绘制了纵向和横向的剩余移动变形沿着线路轴线的变化曲线。根据城市轨道交通地基变形控制指标，对老采空区地表进行了稳定性分区，并分析了地表剩余变形对线路稳定性的影响。结果表明:研究区内存在非稳定区；在非稳定区，横向的剩余变形均小于允许值，而纵向的剩余变形大多超过允许值，必须进行有效的工程措施确保线路安全。 

Evaluation of the influence of residual deformation above mined-out area on the stability of urban rail transit

In order to evaluate the stability of urban rail transit on coal mined-out area influenced by surface residual deformation, according to Xuzhou Rail Transit Line 1, the closed rectangular integral model was established based on probability integral method. After choosing the reasonable computation parameters, the surface residual movement and deformation in the study area were calculated. As a result, the surface residual movement and deformation contours were given. Besides, the curves of transverse and longitudinal movement deformation along the line axis were drawn respectively. According to the limitation of urban rail transit foundation deformation, the study area above coal mined-out area was divided into stable zone, unstable zone and very unstable zone. The influence of the surface residual deformation on rail lines was analyzed. The results indicate that the transverse residual deformations are less than allowable value in the unstable zones, but the longitudinal residual deformations exceed allowable value. Effective engineering measures should be taken to ensure the safety of the line.