采用牛腿桩控制无砟轨道涵洞基础沉降

Foundation Settlement Control over Ballastless Track Culvert by Bracket Pile

为满足时速200 km客货共线无砟轨道严格的变形要求,对涵洞基底置于换填层上或风化岩层W4内的已施工涵洞,采用了牛腿桩加固,以确保承载力要求并对不可预见的变形起安全保证作用。文章以重庆枢纽遂渝引入工程无砟轨道综合试验段涵洞设计为例,对控制无砟轨道涵洞基础沉降的方法进行详细介绍,内容涉及"牛腿桩涵洞的计算"、"牛腿桩施工关键技术"及"涵洞变形观测"等。实践证明,对涵洞基底置于换填层上或风化岩层W4内的已施工涵洞,基础采用了牛腿桩加固后,沉降满足了变形要求。

To satisfy the rigid deformation of ballastless track on mixed passenger and freight line, bracket pile reinforcement is employed on the constructed culvert, of which its base is placed on refilling layer or within W4 of weathered rock layer to ensure bearing capacity and guard against unforeseeable deformation. Taking for example the culvert design of a ballastless track integrated section of Suining-Chongqing lind connecting to Chongqing terminal, the paper details the method of controlling foundation settlement over ballasfless track culvert, which involves calculation of bracket pile culvert, key technology of bracket pipe construction and culvert deformation observation, etc. Practice indicates that bracket pile reinforcement applying on weathered rock layer, can satisfy the constructed culvert, of which its base is placed on refilling layer or within W4 of requirement of deformation of settlement.