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从褥垫层受力和变形的角度出发,提出了一种求解复合地基褥垫层厚度的设计方法。首先,在前人工作的基础上,提出了临界桩土应力比、桩顶应力临界扩散厚度计算公式,由计算公式可以看出桩土临界应力比是置换率和扩散厚度的函数,与荷载水平无关。其次,垫层厚度等于桩顶应力扩散厚度与桩顶刺入量之和,分别给出了桩顶应力扩散厚度与桩顶刺入量的设计方法,桩顶刺入量是荷载水平的函数,荷载越大,刺入量越大,进而求解了垫层厚度。最后,将本文方法计算结果与复合地基载荷试验结果比对,结果比较接近,从而验证了本文计算方法的合理性。
From the perspective of the force and deformation of the mat, a design method for solving the thickness of the mat was proposed. First of all, based on the work of predecessors, the formula of the critical stress ratio between pile and soil and the critical diffusion thickness of pile top stress is proposed. The critical stress ratio of pile and soil is a function of displacement ratio and diffusion thickness, Nothing to do Secondly, the thickness of the cushion is equal to the sum of the stress diffusion thickness at the top of the pile and the amount of penetration at the top of the pile. The design methods of the stress diffusion thickness at the top of the pile and the piercing amount at the top of the pile are given respectively. The larger the load, the greater the amount of penetration, and then solve the cushion thickness. Finally, the calculated results of this paper are compared with those of the composite foundation. The results are close to verify the rationality of the calculation method.