软基煤场堆载挡风墙桩基桩土共同作用分析

Analysis of interaction between dust break wall piles and soil subjected to coal loading in soft foundation

为了分析在大面积堆载情况下临近桩基对土体位移变形产生的影响,结合北仑电厂堆载预压工程,对桩基与土体的相互作用进行三维有限元建模分析.在充分考虑桩基对土体变形所起的约束作用的基础上,通过数值模拟分析得出:在堆载作用下,有桩时比无桩时土体沉降减少;桩周地表在一定范围内土体侧向变形加大.通过桩身弯矩与桩内钢筋的应力计算,验证了软基上煤场堆煤后挡风墙桩基的安全性,并得出了估算存在承台条件下的桩身最大弯矩的经验公式.将所得的计算结果与现场实测数据进行了比较,表明两者有较好的一致性,研究结果可用于指导有关的设计和施工.

In order to study the soil deformation influenced by adjacent piles when subjected to large area loading,3D finite element method was adopted to investigate the pile-soil interaction in the Beilun power station preloading project.By considering the pile restriction to soil deformation emphatically,the numerical simulation analysis showed that the soil settlement decreased with piles existed,while the soil lateral deformation increased around the piles in a certain range close to the ground.Moreover,the bending moment of pile body and the stress of the steel embedded in the pile were calculated to examine the stability of break wall pile foundation under loading.An empirical equation of maximum bending moment was obtained for piles with caps.Good agreement of calculated results with the measured data showed that this work can be used to support the relative design and construction.