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将加筋体和复合地基垫层作为一个整体薄板加以考虑,在考虑薄板非线性变形及加筋体水平抗力作用的基础上,基于虚功理论及Winkler弹性地基模型,建立了双向增强体复合地基加固区沉降计算方法。该方法能综合反映上部荷载、面积置换率、垫层及桩间土刚度、桩土应力比等主要因素的影响。以其为基础,设计完成了2组双向增强体复合地基室内模型试验,得到了其相应的荷载-沉降曲线及桩土应力比数据。模型试验与工程实例计算分析表明,加筋垫层的水平抗力对于降低复合地基沉降量是有利的,其影响不容忽视,同时验证了该方法的合理性和可行性。
Based on the virtual work theory and the Winkler elastic foundation model, a two-way reinforcement composite foundation is established based on the consideration of the nonlinear deformation of stiffened plate and the horizontal resistance of stiffened body. Settlement calculation method of reinforcement zone. This method can comprehensively reflect the influence of the main factors such as the upper load, area replacement rate, soil stiffness between cushion and piles, stress ratio between pile and soil. Based on it, two sets of indoor model tests of composite foundation with bidirectional reinforcement are completed and the corresponding load-settlement curves and pile-soil stress ratio data are obtained. The calculation and analysis of model tests and engineering examples show that the horizontal resistance of the reinforced cushion is beneficial to reduce the settlement of the composite foundation, and its influence can not be ignored. At the same time, the rationality and feasibility of the method are verified.