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鉴于粗粒土强度受内外因影响往往随时间和空间而变化,选取塔城砂砾石试样做了大型三轴试验,研究了轴对称应力条件下粗粒土的强度特性。结果表明,体变增量为零对应于屈服强度,此时体缩变形达最大值;体变增量与轴向应变增量之比的最小值与破坏强度相对应,此时剪胀性最大;破坏强度一般比屈服强度大,且应力应变曲线软化特征越强,破坏强度与屈服强度之间的差异越大;屈服强度参数粘聚力小于破坏强度参数粘聚力,但屈服强度参数内摩擦角大于破坏强度参数内摩擦角。
Since the strength of coarse-grained soil tends to vary with time and space due to internal and external factors, a large-scale triaxial test was conducted on the gravel samples of Tacheng. The strength characteristics of coarse grained soils under axial symmetric stress were studied. The results show that the volume increment is zero and corresponds to the yield strength, and the volume shrinkage reaches the maximum value at this time. The minimum ratio of volume increment to axial strain increment corresponds to the failure strength, ; The failure strength is generally greater than the yield strength, and the stronger the softening characteristics of the stress-strain curve, the greater the difference between failure strength and yield strength; the yield strength parameter cohesion is less than the failure strength parameter cohesion, but the yield strength parameter internal friction The angle is greater than the failure strength parameter internal friction angle.