The common design methods of granular material pile composite foundation are discussed .
讨论了散体材料桩复合地基的一般设计方法。
By the parametric potential energy variational principle, the analytic solution of expansion problem of granular material pile is obtained.
利用参变量最小势能原理，求出了散体材料桩扩张问题的解析解。
The computation method of settlement of granular material pile is discussed, the determining method of pile body modulus of deformation of granular material pile is given.
讨论了散体材料桩复合地基沉降计算方法，给出了散体材料桩桩身变形模量的确定方法。
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