水泥土搅拌桩处理软土路基最优桩距的优化

Optimization on Best Pile Spacing of Cement-Soil Mixing Pile in Soft Soil Foundation Treatment

水泥土搅拌桩处理地基在实际工程中应用广泛。在地基设计中,往往期望能确定最优的桩距以简化施工工艺和节省工程成本,因此,桩距的最优化选择在工程中较为重要。搅拌桩处理地基主要运用复合地基理论,首先假设桩土变形协调,将三维问题简化为二维平面问题,把桩沿里程方向的桩土简化为等效体,加固后的桩间土体等效为一个整体;其次,由面积置换率算出复合地基的弹性参数,利用相关的有限元软件,模拟计算不同桩距下路基的沉降关系曲线;最后,通过对不同桩间下土体的沉降分析,得出搅拌桩最优桩距选择的一般化方法。

Cement-soil mixing pile used in the foundation treatment is more common in practical engineering. In the foundation design, it often expected to adopt the optimal pile spacing to simplify the construction process and save engineering costs, so the optimal choice of pile spacing is very important in the construction. In the foundation treatment by cement-soil mixing piles, based on the composite foundation theory, first assuming that pile-soil deformation coordinates, the cement-soil pile is simplified not only three-dimensional problems to two dimensional plane, but the pile-soil along the length direction to the equivalent body as a whole; at the same time, it calculates the elastic parameters of composite foundation using area replacement ratio, and simulates the settlement curve of foundation under different pile spacing by relevant finite element software. At last, it obtains the in different generalizatio pile spacing n method of the optimal mixing pile spacing choice according to the settlement analysis