CFG桩网复合地基桩-网应力计算方法对比分析

Comparative Analysis on Calculation Methods of Pile-net Stress of CFG Pile-net Composite Foundation

为了更为合理地对铁路路堤CFG桩网复合地基进行设计计算,对比分析了《建筑地基处理技术规范》(JGJ 79—2012)和《建筑地基基础设计规范》(GB5007—2011)、《英国标准BS 8006(1995)和德国行业标准EBGEO(2004)中有关CFG桩网复合地基应力分布特点和应力计算方法的规定。通过分析发现,中国相关规范基本沿用了建筑地基设计方法,未考虑复合地基表面应力分布特点和土工格栅的作用,设计偏于安全;英国标准和德国行业标准中均采用了土拱模型计算桩顶应力和土工格栅拉力,但该模型只适用于特定条件。

To make a reasonable design and calculation for the CFG pile-net composite foundation of the railway embankment, stress distribution characteristics and stress calculation methods of CFG pile-net composite foundation in Technical Code for Ground Treatment of Buildings（ JGJ79—2012）,Code for Design of Building Foundation（ GB5007—2011）,British Standard BS 8006（ 1995） and German Industrial Standard EBGEO（ 2004） were analyzed. The analysis shows that relevant Chinese regulations basically adopt the design method of building foundation,without considering the stress distribution characteristic on the surface of composite foundation and the function of geogrid,so the design is generally simply safe. British standard and German industrial standard adopt soil arch model to calculate the stress on pile top and the tension of geogrid.However,the model is applicable only to specific conditions.