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基于土中群桩分析变分原理,结合桩间土荷载传递法,建立了实用群桩沉降计算方法,并应用于对称桩承路堤结构分析.采用该计算方法,分析了刚性、半刚性竖向加固体复合地基的工作机理.在等应变条件下,桩土模量比相对较低时(Rm<10),桩土应力比与桩土模量比相近;在桩土模量比较高时(Rm>10),桩身模量提高对复合地基应力集中的影响减弱.垫层刚度直接影响桩土模量增加对应力集中的作用效果.水泥搅拌桩有效桩长为15～20m,采用小于15m桩长的经济效益和加固效率更加.
Based on the variational principle of soil group pile analysis and combined with soil load transfer between piles, a practical calculation method for settlement of group pile is established and applied to the structural analysis of embankment with symmetrical piles. By using this method, the rigid, semi-rigid vertical (Rm <10), the pile-soil stress ratio is similar to the pile-soil modulus ratio under constant strain conditions; when the pile-soil modulus ratio is high ( Rm> 10), and the effect of pile modulus on the stress concentration of composite foundation is weakened.The stiffness of cushion directly affects the effect of the increase of pile-soil modulus on stress concentration.The effective pile length of cement mixing pile is 15 ~ 20m, Pile length economic efficiency and reinforcement efficiency more.