超长桩有效桩长问题的探讨

超长桩在大型桥梁和高层建筑中得到了越来越广泛的应用，实际工程中往往会出现桩越来越长的现象，有时桩太长会造成浪费，且不科学，所以有必要研究超长桩的有效桩长问题。运用数学和力学知识，在假定计算模型的基础上，从理论上推导了超长桩的有效桩长的计算公式。结果表明，有效桩长与工作荷载下的桩顶沉降、桩身刚度、桩顶工作荷载及桩侧土体性质有关。这对软土地区超长桩的设计有着重要的指导意义和适用价值。

Research on Effective Length of Super-long Single Pile

The super-long piles have been widely applied in large-span bridges and high buildings, but there is phenomenon that the piles are becoming more and more longer. Sometimes it brings on waste and it is not scientific, so it is necessary to study the effective length of the super-long piles. The cal- culation formula of effective length was derived from theory with the use of mathematics knowledge and mechanics knowledge based on the calculation model. According to the research the effective length was influenced by the settlement under the working load, the rigidity of the pile and the working load on the top of the pile. It has significant instruction and application significance for design of super-long piles in soft soil.