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基于路堤荷载下桩土非等应变条件和考虑了桩土相互作用、桩间土竖向与径向位移、桩土侧面产生相对滑移以及桩侧产生负摩阻力等特点的复合地基桩间土竖向变形模式,推导了水泥土桩复合地基桩间土沉降的理论计算公式,并以桩土单元体范围内的桩间土平均沉降值作为复合地基沉降,进一步推导了水泥土桩复合地基总沉降量、下卧层压缩变形量的理论计算表达式(两者之差即为加固区压缩变形量)。理论分析表明,复合地基加固区压缩量小于同深度天然地基压缩量,复合地基下卧层压缩量小于天然地基下卧层压缩量,复合地基总沉降量小于天然地基总沉降量。同时,理论计算结果与有限元计算结果以及现场实测结果三者比较一致。
Based on the non-equal strain conditions of pile-soil under embankment load and the soil between piles of composite foundation considering the interaction of pile-soil interaction, the vertical and radial displacement of soil between piles, the relative slip on the side of pile-soil and the negative skin friction on pile side, Vertical deformation mode, the theoretical formula for the settlement of soil between cement-soil piles and composite foundation is deduced. Taking the average settlement of soil between piles and soil as the composite foundation settlement, Settlement, the amount of deformation of the underlying layer of the theoretical calculation of expression (the difference between the two is the amount of compression deformation of the reinforcement zone). Theoretical analysis shows that the amount of compression in the reinforcement zone of composite foundation is less than the compression of natural foundation in the same depth, the compression of the subsoil of the composite foundation is less than the compression of the subsoil of the natural foundation, and the total settlement of the composite foundation is less than the total settlement of the natural foundation. At the same time, the theoretical calculation results are consistent with the finite element calculation results and field measurement results.