弹性地基梁有限元法在基坑支护结构中的应用

在基坑支护结构设计中,应用较多的是极限平衡法和弹性地基梁法。极限平衡法基于极限平衡理论,不考虑支护结构与土的共同作用,不能计算支护结构的变形;而弹性地基梁法考虑支护结构与土的变形协调,对于柔性支护结构,其更加符合实际情况,在同等条件下具有更好的经济效益。根据弹性地基梁的计算原理和方法,应用有限元法中的加权余量法和杆系有限元法对其进行求解,并与数值模拟计算结果进行对比分析,验证了弹性地基梁法的实用性和局限性。

APPLICATION OF FEM FOR BEAM ON ELASTIC FOUNDATION IN FOUNDATION PIT SUPPRTING STRUCTURE

In the structure design of foundation pit supporting,the limit equilibrium method and the elastic foundation beam method are often used. The limit equilibrium method based on the limit equilibrium theory can not calculate the deformation of supporting structure,without considering the interaction of supporting structure and soil. And the elastic foundation beam method is in more conformity with the actual condition for flexible supporting structure and has a better economic benefit in the same conditions,considering the deformation compatibility of supporting structure and soil. This paper based on the calculation principle and methods of elastic foundation beam,and the weighted residual method and bar system FEM in FEM were used to solve it. In addition,through comparing with the results of numerical simulation,it was validated that the usefulness and limitations of elastic foundation beam method.