高速铁路载体桩复合地基沉降计算方法探讨  

Discussion on settlement calculation method of composite ground using ram-compacted piles with bearing base in high speed railway

作　　者：陈洪运[1] 马建林[1] 胡中波[1] 杨彦鑫[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《建筑结构》2013年第24期76-79,共4页Building Structure

基　　金：铁道部京沪高速铁路科技重大专项(2008G32-A)

摘　　要：针对高速铁路中载体桩复合地基的受力特点,分别采用Boussinesq法和Mindlin法对载体桩复合地基下卧层的附加应力进行计算和对比分析,结果表明采用Mindlin法计算得到的载体桩复合地基的附加应力比采用Boussinesq法所得的附加应力小。并采用与土层深度有关的天然状态下的压缩模量修正公式对下卧层的压缩模量进行修正,计算了压缩模量修正前后的地基沉降量,将计算结果与实测结果进行对比分析,结果表明:采用压缩模量修正后Mindlin法计算高速铁路载体桩复合地基的沉降,所获得的计算结果与实测结果较为接近,该法对高速铁路中载体桩复合地基加固后的沉降计算具有一定的参考价值。According to the mechanical properties of ram-compacted piles with bearing base （ RPBB ） composite ground in high speed railway, Boussinesq method and Mindlin method were adopted to calculate and analyze the additional stress in the underlying layer of the composite ground. Results indicate that the additional stress calculated by using Mindlin method is smaller than that calculated by using Boussinesq method. The correction formula of compression modulus related with the depth of soil in the natural state was proposed for settlement calculation. The calculated settlement of composite ground before and after using the correction formula were compared, as well as with the measured settlement. The result shows that the calculation method of Mindlin method together with correction formula of compression modulus for RPBB composite ground in high speed railway can get a closer result comparing with the measured settlement, so the method has a certain reference value for the settlement calculation of RPBB composite ground in high speed railway.

关 键 词：载体桩 Mindlin法 Boussinesq法 压缩模量修正 沉降 

分 类 号：TU473[建筑科学—结构工程]