论文部分内容阅读
基于柔性荷载下刚性桩复合地基绕流滑动时的桩土作用分析,改进了用于稳定分析的修正密度法。滑动面圆心外侧填料密度不作修正,拉中性面以上的正摩擦力增大桩间土密度,拉中性面以下的负摩擦力减小桩间土的密度,并考虑了桩身抗拉强度对拉中性面位置和桩间土修正密度的影响,将端阻力的反力换算到桩端土密度中。分析表明,滑动面圆心外侧填料和桩间土密度修正方法的变化对稳定安全系数影响较小,存在软土下卧层时,桩端土密度修正对稳定安全系数影响较大。工程实例证明改进后的修正密度法分析结果与工程实际符合较好。
Based on the analysis of pile-soil interaction when the rigid-pile composite foundation slides under flexible load, the modified density method for stability analysis is improved. The density of the packing outside the center of the sliding surface is not modified, and the positive friction above the neutral surface increases the soil density between the piles. The negative friction below the neutral surface reduces the density of the soil between the piles, and the tensile strength On the neutral position and pull the neutral density of the soil correction, the end of the resistance force converted to the pile end of the soil density. The analysis shows that the change of the filling density and the method of soil density correction between the center of the sliding surface and the piles has little effect on the stability safety coefficient. When there is a soft soil sublayer, the correction of the soil density at the pile tip has a great influence on the stability safety factor. The engineering example proves that the modified density analysis method is in good agreement with the engineering practice.