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为了解花岗岩残积土在压实度变化时的强度特性,采用室内击实试验,测得花岗岩残积土的最大干密度,在三种特殊含水率状态下,按照比例制备不同压实度试样,进行直剪固快试验,探讨压实度大小与抗剪强度的关系。试验结果表明:(1)花岗岩残积土在压实度较小时,剪切值随着位移的变大而增长。含水率较小时,压实度越大,剪切值越容易出现峰值后减退,发生脆性破坏;(2)花岗岩残积土在相同含水率下,随着压实系度的增大,摩擦角和粘聚力也逐渐增大;(3)在等压实度下,含水率对直剪固快的摩擦角影响不明显,但是对粘聚力的影响极为显著。
In order to understand the strength characteristics of granite residual soil when the degree of compaction changes, indoor compaction test was used to measure the maximum dry density of residual granite. Under three special water content conditions, Direct shear fast test, to explore the degree of compaction and shear strength relationship. The results show that: (1) When the compaction degree of granite residual soil is small, the shear value increases with the increase of displacement. When the moisture content is small, the compaction degree is larger, the shear value is more likely to peak and then to decline, and the brittle failure occurs. (2) Under the same water content, the friction angle and Cohesion also increased gradually; (3) Under equal compaction, the influence of moisture content on the friction angle of direct shear was insignificant, but the influence on cohesion was extremely significant.