桩筏基础与地基共同作用的半解析半数值分析法

将群桩筏板基础离散成桩和弹性板,桩筏基础与地基的共同作用转化为桩、弹性板与地基之间的力与位移协调分析。对不同的地基模型求解相应的地基柔度系数,同时将桩作为弹性杆件求解其柔度系数,并将筏板视为地基上的四边自由矩形板,求出其在地基反力、桩顶反力和外荷载以及简支边广义位移共同作用下的位移,最后通过力和位移协调建立桩、筏、地基之间的共同作用方程并求解。算例对比表明半解析半数值方法具有较好的精度,能满足实际工程计算需要。

Interaction Between Piles-Raft Foundation and GroundBased on a Semi-Analytical and Semi-Numerical Method

Considering the piles-raft foundation as a composite system of piles and elastic plate, the interaction between piles-raft foundation and soil is translated into the compatible analysis of force and displacement among piles, elastic plate and ground. Based on different models of foundation subjected to centralized load,the settlement coefficient subjected to uniform load is obtained by means of integral, The flexibility coefficient of piles is calculated by considering the pile as elastic member, and with raft identified as four sides free rectangle plate on the ground, the displacement of raft suffering external loads, counter force of soil and generalized displacement on the boundary could be obtained. A semi-analytical and semi- numerical method, using compatible analysis of force and displacement between piles, elastic plate and ground, is developed to analyze the interaction between piles-raft and subsoil. Numerical analysis prove that the semi-analytical and semi-numerical method is provide an accurate and practical calculation tool to. and meet the needs of practical engineering.