全风化花岗岩坡积土水平推挤试验分析

Analysis of pushing shear test for colluvial soil from whole weathered granite

结合湖北通城至湖南平江高速公路具体的边坡工程,通过多组现场水平推挤试验研究了全风化花岗岩坡积土的变形特点和相关的抗剪强度指标。试验结果表明,对于力学特性介于土体和岩石之间的全风化花岗岩坡积土进行水平推挤试验,能保证土样的原始结构和含水状态,并沿潜在的滑动方向进行大面积剪切,是一种合理有效的试验方法。试验所得结果和全风化花岗岩坡积土体的真实值较接近,能为边坡稳定性分析和边坡加固提高的可靠依据。

Combined with specific slope works of freeway from Tongcheng in Hubei to Pingjiang in Hunan,through multi-group field pushing shear test,a research on the deformation features and relevant shear strength parameters of colluvial soil from whole weathered granite was conducted.The test results indicate that pushing shear test for colluvial soil from whole weathered granite,whose mechanical property is between that of the soil mass and the rock,can maintain the primary construction and moisture condition of soil sample and it shears in potential slide direction in large area,which is a reasonable and effective test method.The test result coincides well with the true values of soil parameters and it can provide reliable reference to slope stability analysis and slope stabilization.