群桩-厚筏板基础的简化计算方法

Simplified calculation method of pile group-mass raft foundation

提出了一种群桩-土-筏板基础共同作用的有限元简化计算方法,计算时将筏板下的桩、土根据各自的非线性刚度简化成弹簧作用在筏板上,对厚筏板采用三维退化层合单元进行有限元计算,在保证精度要求下有效地减少了单元数和节点数。对一实际桩筏基础进行了计算和分析,用以指导优化设计,并把计算结果与等刚度法计算结果及实测值进行了比较,计算结果与实测比较吻合。

It presents a simplified finite element calculation way for the piles-raft-soil＇ s interaction. The calculation is under the way of simplifying the pile and soil＇ s individual nonlinear stiffness as the spring using on the raft. The degenerated 3-D laminated element is adopted by the mass raft foundation for the finite element calculation, which reduces the element and node numbers effectively under the condition of insuring the precision. The experiment calculates and analyzes the actual pile raft foundation for guiding and simplifying the design, and also in comparison with the three of calculation resuh, equal stiffness way result and actual numerical value. The result shows the comparison coincidently and proves this simplified way workably.