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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 stiffened cushion is regarded as an elastic thin plate, and the foundation soil is simplified as the Winkler elastic foundation model. Considering the influence of horizontal stiffeners, the settlement formula of bidirectional reinforced composite foundation is derived from the reciprocal theorem of work. The formula comprehensively reflects the influence of the factors such as the flexural rigidity of horizontal stiffened cushion, spacing of pile, foundation coefficient of foundation soil and upper load on the settlement of composite foundation. A set of “rigid pile + geogrid” composite foundation load test was completed, and the settlement under step-by-step loading was calculated by the method in the article. The obtained p-s curve was in good agreement with the measured p-s curve. An engineering example is calculated to verify the accuracy of the method.