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根据大直径扩底桩桩端应力的分布特征,利用Mindlin基本解推导了扩底桩桩端沉降计算公式,并给出了沉降影响系数。公式中桩端持力层土体的变形模量用深层平板静力载荷试验测定,但深层载荷试验有时难以实现。为此根据收集的扩底桩工程实测沉降和原型扩底桩静载试验结果,建立了工程中常用的压缩模量与变形模量间的关系,并给出了两者的换算关系。大量的工程实测表明,得出的扩底桩沉降计算公式是实用的。
According to the distribution characteristics of stress at the end of large diameter expanded pile, the settlement formula of pile foundation at the end of expanded bottom pile is deduced by Mindlin basic solution, and the influence coefficient of settlement is given. The deformation modulus of soil in the end bearing layer in the formula is determined by the deep plate static load test, but the deep load test is sometimes difficult to achieve. Based on the measured settlement and the static load test results of the expanded bottom piles, the relationship between the compressive modulus and the modulus of deformation, which is commonly used in engineering, is established and the relationship between the two is given. A large number of engineering measurements show that the formula for calculating settlement of bottom-piled piles is practical.