密实砂土地基承载力性状分析与研究

Study of the Bearing Capacity of Dense Sand Foundations

通过对密实砂土进行一系列三轴排水压缩试验 ,探讨了砂土的峰值内摩擦角 φmax和剩余内摩擦角 φres随应力水平的变化规律。运用三轴试验以及离心试验结果 ,从数值上计算并分析了土的内摩擦角对承载力因数Nγ 的影响 ,承载力因数Nγ 随着基础尺寸增加而减小是因为土的内摩擦角随着应力水平增加而减小以及土的渐进破坏所致 ,实际内摩擦角值在φmax和

Based on a series of drained triaxial compression tests, that the peak friction angle( φ max )and the residual friction angle( φ res )of sand change with stress level was investigated. Using the triaxial test data and the centrifugal test results, quantitative estimation and analysis of the effect of soil friction angle on the bearing capacity factor (N γ )has been presented. The decrease of N γ with footing size is due to the fact that soil friction angles φ max and φ res decrease with stress level and progressive failure of soil, which reduces soil friction angle to a value between φ res and φ max .