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提出一种多向荷载作用下层状地基中刚性桩筏基础的计算方法。基于剪切位移法,采用传递矩阵形式分析了竖向荷载下桩顶面-桩顶面相互作用;引入修正桩侧地基模量,采用有限差分法分析了水平荷载下桩顶面-桩顶面相互作用;基于层状弹性半空间理论,分析了多向荷载下桩顶面-土表面、土表面-桩顶面、土表面-土表面的相互作用关系。建立了桩土体系柔度矩阵,得到了多向荷载下层状地基中刚性桩筏基础的受力和变形的关系以及桩的内力和变形沿桩身分布规律。通过与有限元对比,验证了该方法的合理性和修正地基模量的优越性,并对多向荷载作用下的桩筏基础进行了计算分析,计算结果表明,水平力将会引起桩筏基础的倾斜。
A method for calculating the rigid piled raft foundation in layered soils under multidirectional loading is proposed. Based on the shear displacement method, the interaction between the pile top surface and the pile top surface under vertical load was analyzed by using the transfer matrix. The foundation modulus of the pile was corrected and the finite element method was used to analyze the top- Based on the layered elastic half-space theory, the interaction between pile top surface-soil surface, soil surface-pile top surface, soil surface-soil surface under multi-directional load is analyzed. The flexibility matrix of pile-soil system was established. The relationship between the stress and deformation of the rigid piled raft foundations under multi-directional loading and the distribution of internal forces and deformation of the pile along the pile body were obtained. By comparing with the finite element method, the rationality of the method and the superiority of the modified foundation modulus are verified. The calculation and analysis of the piled raft foundation under the multi-directional load is carried out. The calculation results show that the horizontal force will cause the piled raft foundation The tilt.