高速铁路载体桩复合地基沉降计算方法探讨*
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（西南交通大学土木工程学院， 成都 610031）［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。［关键词］载体桩; Mindlin法; Boussinesq法; 压缩模量修正; 沉降中图分类号：TU473 文献标识码：A 文章编号：1002-848X(2013)24-0076-04Discussion on settlement calculation method of composite ground using ram-compacted piles with bearing base in high speed railwayChen Hongyun, Ma Jianlin, Hu Zhongbo, Yang Yanxin(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China)Abstract: 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.Keywords: ram-compacted piles with bearing base; Mindlin method; Boussinesq method; compression modulus correction; settlement*铁道部京沪高速铁路科技重大专项（2008G32-A）。作者简介：陈洪运，博士研究生，Email：278709407@qq.com。参考文献［1］龚晓南. 复合地基理论及工程应用［M］. 2版. 北京: 中国建筑工业出版社, 2007.［2］闫宝杰，宋修广，岳跃群. 粉喷桩复合地基附加应力的Boussinesq-Mindlin联合解法［J］. 岩土力学， 2007, 28(6): 1255-1258［3］MINDLIN R D. Force at a point in the interior of a semi-infinite solid［J］. Physics， 1936, 7(5): 195-202.［4］GEDDES J D. Stresses in foundation soils due to verical subsurface loading［J］. Geotechnique，1966, 16(2): 231-255.［5］张小平，俞仲泉. 用Mindlin解推求复合地基中附加应力的计算公式［J］. 河海大学学报：自然科学版， 1999, 27(2): 35-39.［6］JGJ 135—2007 载体桩设计规程［S］. 北京: 中国建筑工业出版社, 2007.［7］徐志英. 以明特林(Mindlin)公式为根据的地基中垂直应力的计算公式［J］. 土木工程学报，1957, 4(4): 485-497.［8］GB 50007—2011 建筑地基基础设计规范［S］. 北京: 中国建筑工业出版社, 2012.
