排水管桩沉桩后桩周土体固结解析解

Analytical solution of soil consolidation around drainage pipe pile after pile driving

排水管桩的概念渐渐被工程界熟知,是软基处理的一种新思路.结合排水管桩的特点,推导得出沉桩后桩周土体内的孔压和固结度解答.并根据所得解答,对沉桩后桩周土体内的超孔隙水压力的消散特性进行分析.结果表明:距桩体较近处的超孔隙水直接沿着排水桩排出,而距离桩体较远处的超孔隙水先流向弹性低压区,再转头流向排水桩排出.随着开孔率β的增加,孔压的消散变快.当β超过10-7时,继续增大其值对加快孔压消散的效果不明显.

The concept of drainage pipe pile,which is a new idea of soft foundation treatment,is gradually known by the engineering field.By considering the characteristics of the drainage pipe pile,the solution of pore pressure and consolidation degree in the soil around the pile after pile driving is derived.According to the obtained solution,the dissipation characteristics of excess pore water pressure in the soil around the pile after pile driving are analyzed.The results show that the excess pore water near the pile is directly discharged along the drainage pile,while that far away from the pile first flows to the elastic low-pressure zone,and then turns to the drainage pile.With the increase of opening ratioβ,the pore pressure dissipates faster,and whenβexceeds 10-7,the increase of the opening ratio has little impact on the dissipation of the excess pore-water pressure.