全风化粗粒花岗岩现场直剪试验研究

Study on Field Direct Shear Test of Fully Weathered Coarse-grainedGranite

全风化粗粒花岗岩粗颗粒含量较多,而且粗颗粒含量对土体的抗剪强度特性具有一定的影响。实际工程中全风化粗粒花岗岩不扰动土样采取较困难,抗剪强度指标一般取经验值。本文开展了全风化粗粒花岗岩现场直接剪切试验,对比分析了试验结果与以往经验值,最后提出了全风化粗粒花岗岩的抗剪强度指标建议值。

The content of coarse particles,which accounts for a large amount of the total weathered coarse-grained granite,has a certain influence on the shear strength characteristics of the soil.Because it is difficult to take samples of fully weathered coarse-grained granite without disturbing soil samples in actual projects,the shear strength index generally takes empirical values.In this paper,a field direct shear test of fully weathered coarse-grained granite is carried out,and the test results are compared and analyzed with previous empirical values.Finally,the recommended value of the shear strength index of fully weathered coarse-grained granite is proposed.