模拟堆载作用的黄土边坡土体变形机理试验

通过固结不排水剪试验,研究了堆载作用下不同深度、含水量和围压的原状黄土的变形和破坏特征,并从黄土的微观结构角度分析了产生这一现象的原因,结合黄土边坡特殊的工程地质条件,分析了堆载作用下黄土边坡土体的变形破坏过程。试验结果表明,不同深度、含水量和围压的原状黄土的应力应变曲线和抗剪强度具有不同的特征;特殊的工程地质条件,使黄土坡体的某些部位形成了堆载作用下不利于黄土材料强度保持的含水量和围压的组合,导致了这些部位黄土的变形破坏,进而诱发坡体的变形破坏。

Test Study for Simulating Soil Deformation Mechanism of Loess Slope Under Load Condition

By means of triaxial compression test,the characteristics of deformation and failure of the natural loess which is sampled from the different depth of slope and has different confining pressure and moisture content are researched,and the reasons are analyzed according to the microstructure of loess samples.According to the above results,the process of deformation and failure of the loess slope under load condition are explained.The test results show that the natural loess which is sampled from the different depth of slope and has different confining pressure and moisture content have the different characteristics of stress-stain curves and the shear strength.The special conditions of engineering geology of loess slope result in the combination of moisture content and confining pressure that is adverse to maintain the strength of loess,this can result in the failure of loess and loess slope.