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以山西某工程为例 ,运用有限元方法 ,对GC桩和CFG桩组合型复合地基的变形特性进行了数值模拟研究 ,得出了以下几个主要结论 :(1 )桩土的沉降变形差别不大 ,表现为复合地基的整体下沉 ,下卧土层的压缩量占据主导地位 ;(2 )合理布置桩的组合类型尤其是CFG桩 ,既利用CFG桩的承载性能 ,又可利用其“护桩”性能 ,使得提高复合地基承载力的同时 ,降低复合地基周围地表的隆起 ;(3)组合型复合地基中超孔隙水压力的消散较单一碎石桩复合地基稍慢 ,决定了该类复合地基的固结变形稳定时间较长 ,如何充分利用GC桩的排水特性 ,尚需更加深入的研究
Taking a project in Shanxi Province as an example, finite element method is used to study the deformation characteristics of composite foundation with GC pile and CFG pile. The main conclusions are as follows: (1) The settlement difference between pile and soil is not different Large, showing the overall subsidence of composite foundation, the amount of compression of the subsoil dominated; (2) The rational combination of types of piles, especially CFG piles, not only take advantage of the bearing capacity of CFG piles, Pile "performance, so as to improve the bearing capacity of the composite foundation and reduce the surface elevation around the composite foundation; (3) the dissipation of excess pore water pressure in the composite composite foundation is slightly slower than that of the single gravel pile composite foundation, Of the consolidation deformation stability time is longer, how to make full use of the drainage characteristics of GC piles, the need for more in-depth study