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针对高速铁路无砟轨道对路基工后沉降控制的严格要求,某车站采用了PHC管桩+钢筋混凝土筏板锚固联接的桩筏基础对深厚第四系土质地基进行了加固处理。本文介绍了桩筏基础的设计方法,分析了现场监测数据。监测结果表明,管桩桩筏基础处理后的地基沉降变形很小,经评估路堤的工后沉降均可以满足铺设无砟轨道的要求。
Aiming at the strict requirements of high-speed railway ballastless track on post-construction settlement control of subgrade, a piled raft foundation anchored with PHC pipe pile and reinforced concrete raft is adopted at a station to reinforce the deep Quaternary soil foundation. This paper introduces the design method of piled raft foundation and analyzes the on-site monitoring data. The monitoring results show that the settlement of the foundation after the pile foundation treatment is small, and the post-construction settlement of the embankment can meet the requirements of laying the ballastless track.