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目前以压缩试验得到的e-p曲线为基础的分层总和法仍然是地基沉降分析中最常用的方法。割线模量法是近年来为人们所熟知的计算地基沉降的新方法,具有不受初始孔隙比影响、便于电算等优点。传统的割线模量法将土体的压缩应力-应变关系视为双曲线形式。通过对压实黄土压缩应力-应变关系曲线的研究和对传统割线模量法计算的割线模量与压缩模量的比较表明,导致割线模量法和e-p曲线法计算结果差异的主要原因是土体压缩应力-应变关系符合双曲线的假定,将压实黄土的应力-应变关系用更符合实际情况的幂函数进行拟合,得到了基于幂函数形式的压缩应力-应变关系曲线的沉降量计算公式,并结合具体工程进行了沉降计算对比分析,将割线模量法进行了推广应用。
The stratified summation method based on the e-p curve obtained by compression test is still the most commonly used method for foundation settlement analysis. The secant modulus method is a well-known method of calculating the settlement of foundations in recent years. It has the advantages of being independent of the initial void ratio and being easy to calculate. The traditional secant modulus method considers the compressive stress-strain relationship of soil as hyperbolic. Comparing the compressive stress-strain curve of compacted loess with the secant modulus and compressive modulus calculated by the traditional secant modulus method, it is shown that the main difference between the calculated results of the secant modulus method and the ep curve method The reason is that the compressive stress-strain relationship of soil complies with the hypothesis of hyperbola, and the stress-strain relationship of compacted loess is fitted by a power function that is more in line with the actual situation. The compressive stress-strain curve based on power function is obtained Settlement calculation formula, combined with specific engineering settlement calculation comparative analysis, the secant modulus method was popularized and applied.