堆载作用下地下连续墙-桩组合基础数值分析

发布时间：2019-08-03 07:30

【摘要】：地下连续墙-桩组合基础的理论研究尚处于起步阶段,地下连续墙-桩组合基础和周围土体共同作用时其水平变形和内力变化机理以及载荷之间的分担情况已成为亟待解决的关键问题。基于堆载作用下地下连续墙-桩组合基础的水平承载性状,采用有限差分软件FLAC3D进行数值分析,探讨不同堆载等级、不同墙桩长度比、有无竖向荷载、桩径、堆载面积以及堆载距离等影响因素对地下连续墙-桩组合基础的水平变形及的变化规律。结果表明:堆载等级、不同墙桩长度比、堆载距离以及堆载面积对组合基础的水平变形和内力的影响敏感性较为突出;组合基础上部和地下连续墙与桩的连接处2个部位需要着重考虑不利影响问题;组合基础上部的地下连续墙对水平推力的承担比重较大,下部的桩主要起嵌固作用,地下连续墙与桩的长度比为4∶6时设计更合理。
[Abstract]:The theoretical research of underground continuous wall-pile composite foundation is still in its infancy. The mechanism of horizontal deformation, internal force change and load sharing between underground continuous wall-pile composite foundation and surrounding soil have become the key problems to be solved urgently. Based on the horizontal bearing behavior of underground continuous wall-pile composite foundation under surcharge load, the finite difference software FLAC3D is used to carry out numerical analysis to discuss the variation of horizontal deformation and variation of underground continuous wall-pile composite foundation affected by different surcharge grade, different wall pile length ratio, vertical load, pile diameter, surcharge area and surcharge distance. The results show that the sensitivity of the influence of surcharge grade, different wall pile length ratio, heap load distance and surcharge area on the horizontal deformation and internal force of the composite foundation is prominent, and the adverse effects should be taken into account in the upper part of the composite foundation and the joint of the underground continuous wall and the pile. The proportion of horizontal thrust borne by the underground continuous wall in the upper part of the composite foundation is large, and the pile in the lower part mainly plays the role of embedding, and the design of the length ratio of the underground continuous wall to the pile is more reasonable when the length ratio of the underground continuous wall to the pile is 4: 6.
【作者单位】：山东建筑大学土木工程学院;山东电力工程咨询院;
【基金】：基金项目:2014年横向(K22014016)
【分类号】：TU473.1;TU476.3

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