素混凝土桩在委内瑞拉混合土地层中的应用

Application of Pure-Concrete-Pile in Mixed Soils of Venezuela

委内瑞拉首都加拉加斯四面环山的地形地貌,为混合土的形成提供了物质来源。位于委内瑞拉的某场地,地层以混合土为主且成分复杂,由砂类混合土、碎石类混合土、粉土和粉质粘土构成,标准贯入试验锤击数较离散,土层分布均匀性差且承载力不能满足设计要求。在场地进行了天然地基静载试验和素混凝土桩复合地基静载试验,试验表明,经素混凝土桩复合地基加固处理后,地基承载力有较大幅度地提高,同时得出了适宜的复合地基施工工艺,使得素混凝土桩在该类混合土地层中得到成功应用。

The topography and geomorphology of which surrounded by mountains is the material sources of mixed soils in Caracas,Venezuela.The project in this paper is located in Caracas with the mixed soils that contain sand,gravel,silt and silty clay.And the mixed soils with lower bearing capacity is unhomogeneous which represented by discrete SPT blow counts.Through the PLTs on nature ground and pure-concrete-pile composite ground,this paper indicates that the beating capacity of the mixed soils is more increased by ground improvement.And feasible construction technology of pure-concrete-pile is also tested.The application of pure-concrete-pile composite ground in Caracas mixed soil is successful and perfect.