考虑负摩阻力影响的桩土复合地基承载力计算

Calculation of bearing capacity of pile soil composite foundation with negative friction is considered

结合新疆某拟建平原水库工程,就供水兼退水涵洞坐落的软黏土地基,进行了混凝土预制桩加固处理。在验算桩土复合地基承载力特征值时,充分考虑了涵洞周围大面积地面堆载给基桩带来的负摩阻力问题,采用建筑桩基技术规范相关公式,计算时将下拉荷载标准值和单桩竖向极限承载力标准值进行了叠加,根据叠加后的单桩竖向承载力标准值进行桩土复合地基承载力特征值计算。

In this paper,the pre-formed concrete pile treatment of soft clay foundation of water supply culvert is carried out on a Xinjiang plain reservoir dam which was planned to build.When the bearing capacity of the composite foundation is verified,the negative friction resistance caused by large area ground piles around the culvert is considered.By building pile foundation technical specification related formula,are calculated by considering the effect of pile group foundation pile drop-down load standard values,will drop down load standard values and superposition of the single pile vertical ultimate bearing capacity standard,according to the superposition of single pile after standard value of vertical bearing capacity of composite foundation bearing capacity of piles and soil characteristic value calculation.