深层搅拌桩弥补钻孔灌注桩承载力不足的尝试

Attempt of adding deep-mixing pile to remedy inadequacy of borehole casting pile

针对某工程钻孔灌注桩的单桩进行静、动试验,对单桩极限承载力不能满足设计要求进行了分析。提出了用柔性深层搅拌桩弥补刚性灌注桩承载力不足的处理措施,对刚、柔性桩受力和变形协调性进行了分析,并使二者共同作用。处理结果表明:这种方法既经济,又便于施工,能完全达到设计要求,对类似地基事故处理具有参考作用。

In light of the static and dynamic pile testing on a single casting pile of a project , the limit bearing capacity of a single pile that can not meet the design requirement is analyzed; then the treating measure, i.e. to use flexible deep-mixing pile to remedy the inadequacy of the casting piles bearing capacity, is put forward. The two aspects of rigid pile抯 and flexible pile抯 force bearing condition and deformation compatibility are analyzed; it is shown that the two piles can act jointly. This treating method not only is lower in cost but also is convenient in construction. The practical engineering treatment result has totally reached the design effect. Our method can be for reference of similar foundation incidents treatment.