复合桩基优化设计方法与工程验证

提出用基于 Geddes应力解的分层总和法计算桩群分担荷载所引起的地基沉降 ,用基于 Boussinesq解的分层总和法计算承台下土分担的荷载所引起的地基沉降 ,将两者之和作为桩基沉降量。结合一个具体的工程将该方法计算的沉降量和其它方法计算的沉降量及实测值进行对比 ,通过研究沉降量与各种因素的关系 ,对复合桩基的优化设计进行了探讨。

Method of optimization design and practical engineering checking of composite pile foundation

A method of calculating the settlement of composite pile foundation is presented. The ground settlement result from the load shared with pile group is calculated by using layering summation based on Geddes stress formula; the ground settlement result from the load shared with soil under bearer platform is calculated by using layering summation based on Boussinesq formula. The former plus the later makes the total settlement. The field tests of practical engineering of composite pile foundation are discussed in the paper. Comparing the calculated result with the observed result, it is shown that the calculated value corresponds with the observed value. It is indicated that applying the method to the engineering practices is feasible. At last, the settlement of a practical engineering is calculated. some influence factors, such as pile length, pile space, the number of piles, and the modules of ground soil, are researched by this method. The results obtained in this paper can guide the optimization design of composite pile foundation.