双向增强体复合地基沉降分析

Analysis of Settlement of Double Direction Reinforced Composite Foundation

将水平加筋垫层视为一弹性薄板,地基土体简化为Winkler弹性地基模型,考虑水平加筋体的影响,由功的互等定理推导出双向增强体复合地基沉降计算式。该式综合反映了水平加筋垫层抗弯刚度、桩间距、地基土体基床系数、上部荷载等因素对复合地基沉降的影响。完成了一组"刚性桩+土工格栅"复合地基载荷试验,用文中方法计算其逐级加载下的沉降量,所得p-s曲线与实测p-s曲线吻合较好。对一工程实例进行计算,验证了文中计算方法准确性。

The horizontal reinforced cushion was regarded as an elastic sheet and the soil foundation as a Winkler elastic foundation model.Considering the influence of the horizontal reinforced cushion,the formula of the settlement of double direction reinforced composite foundation was deduced by using the reciprocal-work theorem.This formula takes the following influence factors into account： the flexural rigidity,the pile spacing,the foundation modulus of the soil,the upper loads and so on.The loading test of the＂rigid pile ＋ geo-grid＂composite foundation was performed,the settlement of the double direction reinforced composite foundation under the multistage loadings was calculated by the presented calculating method,and the calculated p-s curve is much close to the measured one.Finally,to validate the accuracy of the proposed method,a calculation example was illustrated.