岩溶隧道内无砟轨道上拱原因分析与治理

摘要

结合大对门隧道内无砟轨道,分析了岩溶地区隧道内无砟轨道上拱变形的特征、原因及影响因素,探讨了相应的治理方案.研究结果表明:岩溶地区由于地下水丰富,且具有良好通道,水进入仰拱填充层和无砟轨道垫层间形成较高的承压水头,导致轨道板抬升.针对病害原因,采用了打孔排水减压、底板锚固和增设泄水洞的综合治理方案.整治后基础稳定,说明该整治方案合理.%Based on the ballastless track in Daduimen tunnel,the features,causes and influencing factors of upwarp of ballastless track slab in karst tunnel were analyzed, and treatment measures were presented. Owing to the rich groundwater and the good channel in karst area,the high conf ined water head appeares between invert and cushion, leading to slab upwarp deformation. The comprehensive treatment measures of drainage by drilling, anchorage in baseplate and draining tunnel were adopted. The observations show that the slabs are stability and the methods are reasonable.