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以模型试验方法研究了变刚度复合地基的承载特征、沉降分布、变形影响范围、桩土荷载分担比及基桩荷载传递特性。试验数据表明:在荷载较大的核心筒区密集布桩而在荷载较小的边角区稀疏布桩或不布桩,能有效地减少基础沉降差,同时减少基桩工程量,复合地基筏下布桩的平均桩顶反力应小于基桩的单桩极限承载力以保证基础总体沉降满足安全要求。
The load-bearing characteristics, settlement distribution, deformation influence range, load-sharing ratio of pile-soil and pile-load transfer characteristics of composite foundation with variable stiffness were studied by the model test. The experimental data show that the densely piled piles in the core with larger load and the sparse piles or non-piled piles in the corner area with less load can effectively reduce the foundation settlement difference and reduce the amount of foundation piles, The average pile top reaction force of the lower pile should be less than the ultimate bearing capacity of the pile to ensure the overall settlement of the foundation to meet the safety requirements.