软土水平运动作用下被动双桩基础遮拦效应的三维数值分析

Three-dimensional Numerical Studies on the Reinforcing Effect of Coupled Passive Piles Under Soft Soil Movement Action

运用FLAC3D软件,对软土水平运动作用下被动双桩基础中存在的遮拦效应进行三维数值研究.从p-δ曲线和群桩遮拦效应系数方面对遮拦效应进行了分析,并对软土运动形式进行了研究.结果表明:在土体水平运动作用下,软土中遮拦效应表现出过程性、不均匀性和统一性的特点;桩间距是影响遮拦效应大小的重要因素;当桩间距达7倍桩径时,遮拦效应基本消失;软土中被动桩基础遮拦效应的影响规律与土体的近地效应和绕流形式有关.

Based on the utilization of FLAC3 D software, the reinforcing effect of the coupled passive stiff piles under soft soil movement action was investigated. Piles' reinforcing effect was analyzed based on p-δ curves and pile group's masking effect coefficient, and soft soil's movement was studied. The results show that soft soil pile reinforcing effect exhibit procedural, uneven and uniformity characteristics. Pile spacing is an important factor affecting pile reinforcing effect. When the pile spaced up to 7 times, the piles' reinforcing effect was disappeared. Regular pattern of influence of pile reinforcing effect is related to near surface effect and body-past flow in soil.