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结合郑州地区广泛分布的粉土及其特殊的工程特性,采用ABAQUS数值模拟方法,研究粉土地区上部结构与地基基础共同作用下,上部结构分层施工、地基土含水率变化、筏板厚度等对筏板基础内力的影响。并对比了常规计算方法与共同作用方法的计算差异。计算结果表明,考虑共同作用时,筏板最大应力小于常规设计,并且位置由筏板中部向筏板边缘发生移动。当地基土含水率在增加到最优含水率时,在筏板外边缘出现局部弯曲变形,产生应力集中现象。当超过最优含水率时,随地基土含水率增大,基底反力向周围扩散,筏板应力分布较为均匀。
Based on the widely distributed silt in Zhengzhou and its special engineering characteristics, ABAQUS numerical simulation method is used to study the effect of superstructure and foundation on the stratification of superstructure, the change of soil moisture content, the thickness of raft and so on Impact on internal forces of raft foundation. The differences between the conventional method and the common method are compared. The results show that the maximum stress of the raft is less than that of the conventional design when considering the interaction, and the position is shifted from the middle of the raft to the edge of the raft. When the local soil moisture content increases to the optimum moisture content, local bending deformation occurs on the outer edge of the raft, resulting in stress concentration. When the optimal water content is exceeded, the moisture content of the foundation soil increases, and the reaction force of the substrate diffuses to the surroundings and the stress distribution in the raft is more uniform.