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利用大型多功能界面剪切仪对粗粒土进行大型直剪试验,并针对粒径范围在20～50 mm及10～20 mm的特殊试样进行两组对比试验,对粗粒土的力学特性及强度参数进行分析;试验结束后对所有试样进行颗粒筛分,总结颗粒破碎规律。结果表明:粗粒土属于剪切硬化型材料,不良级配材料强度非线性特性明显,呈现较大假黏聚力,摩擦强度变化较小;筛分分析表明,颗粒破碎率随法向应力增加明显增大,二者符合双曲线关系,其拟合参数与级配及颗粒尺寸等密切相关。
Large-scale multi-function interfacial shears are used to conduct large-scale direct shear tests on coarse-grained soils. Two sets of comparative tests are conducted on special specimens with particle sizes ranging from 20 to 50 mm and 10 to 20 mm. The mechanical properties of coarse grained soils And strength parameters were analyzed; after the test, all the samples were sieved by particles to summarize the rules of particle breakage. The results show that the coarse grained soil belongs to the shear-hardened material, and the non-linear graded material possesses obvious non-linear characteristic of strong false cohesion and small change of the friction strength. The screening analysis shows that the particle breaking rate increases with the normal stress Significantly increased, the two accord with hyperbolic relationship, the fitting parameters and grading and particle size are closely related.