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炭质泥岩是一种特殊的泥岩,西南地区炭质泥岩土石混合料广泛分布。通过对不同炭质泥岩含量试样的大型直剪试验,研究了30%、60%、100%三种含量的炭质泥岩土石混合料抗剪强度指标的变化规律,并对天然和饱和两种状态下炭质泥岩土石混合料进行大型剪切试验研究,试验结果表明:相同法向应力下,炭质泥岩含量越大,抗剪强度越大;随着炭质泥岩含量的增大,混合土石料的内摩擦角变小,内聚力变大;天然状态的剪应力随着水平位移增大而增加,没有明显的峰值,而饱和状态的剪应力与水平位移关系曲线趋于水平。
Carbonaceous mudstone is a kind of special mudstone, and the carbonaceous mudstone and earth rock mixture in southwest China is widely distributed. Through the large-scale direct shear test of different carbonaceous mudstone samples, the change law of shear strength index of carbonaceous mudstone mixture with 30%, 60% and 100% State test, the results show that the greater the content of carbonaceous mudstone is, the greater the shear strength is. Under the same normal stress, with the increase of carbonaceous mudstone, The internal friction angle becomes smaller and the cohesive force becomes larger. The shear stress in natural state increases with the increase of horizontal displacement, and there is no obvious peak value. The curve of the relationship between shear stress and horizontal displacement in the saturated state tends to level.