长短桩技术在有邻近堆土建筑中的应用

建筑物周边的不均匀堆土给建筑物带来了安全隐患，如何消除这些安全隐患又避免高昂的桩基工程造价，就这一问题针对土层中存在多层可利用的桩端持力层提出了短桩、桩间土提供承载力，堆土侧采用长桩控制建筑物的不均匀沉降的长短桩组合桩基础的设计思路，并对全短桩方案和邻近堆土侧加长桩长的长短桩方案分别进行了三维有限元分析。分析结果表明，对有邻近不均匀堆土的建筑物采用长短桩组合桩基础，不仅可以有效地控制建筑物的不均匀沉降，而且大大减小了桩基础的工程造价，对解决不均匀堆土对建筑物带来的危害，提供了一种设计思路。

The Application of Composite Long-Short Pile Foundation in High Fill Soil Building

The fill soil of different heights around buildings would easily lead to salty problems. In order to solve it and reduce the cost of pile foundation, the design philosophy for composite long-short pile foundation is presented when some bearing soil existing. Long piles are mainly build to control the settlement and short piles as well as soil mainly to provide bearing capacity. The 3D finite element method is used to simulate the performances of a short pile foundation and a composite long- short pile foundation by the fill soil. The results indicated that the composite long-short pile foundation can greatly cut the cost of pile foundation and effectively control the different settlements. So the composite long-short pile foundation may solve the salty problems and the design philosophy is useful.