SMW工法圆形工作井土体反力计算方法的研究

分析了采用型钢水泥土复合挡土墙(soil mixing wall,SMW)工法建造的圆形工作井在顶力作用下的受力机理,提出承载半圆后背土体的竖向和环向反力分布呈拟正态分布,求得后背土体所能承受的最大土体反力计算公式.从整体分析的角度出发,应用三维实体有限元分析技术,研究了由顶推力反力引起的工作井后背土体反力分布.与有限元计算结果比较表明,拟正态分布曲线与有限元计算得到的土体反力分布曲线较吻合.

Researches on earth counterforce calculation in circular working shaft by SMW methods

The loading mechanism under the action of jacking force of round working shaft by soil mixing wall(SMW) methods was investigated. Both vertical and radial earth counterforce at the back of the loaded semicircular wall were considered as quasi-normal distribution. The formula for maximal earth counterforce at the back of the loaded wall was obtained. The distribution of earth counterforce at the back of the loaded working shaft wall induced by jacking counterforce was analyzed by 3 dimension solid finite element model which shows that the quasi-normal distribution curve fitted the earth counterforce distribution curve.