滑带土抗剪强度与其矿物成分典型相关性分析

滑带土抗剪强度特性是影响滑坡稳定性状态、控制滑坡变形演化过程的关键因素,而滑带土矿物成分又是决定其抗剪强度特性的重要内因之一。以三峡库区吊钟坝滑坡群Ⅰ-1号滑坡滑带土为研究对象,探讨了滑带土矿物成分在不同饱水时间下的变化规律。结合相应饱水条件下滑带土的抗剪强度数值,分析了滑带土抗剪强度与其矿物成分间的典型相关性,以期进一步解释不同矿物成分在滑带土抗剪强度特性中所起的作用。研究结果表明,随着饱水时间的延长,滑带土中黏土矿物的相对含量先降低后趋于稳定;滑带土抗剪强度与其矿物成分表现出明显的相关性,影响滑带土凝聚力和内摩擦角峰值的主要矿物为蒙脱石和石英,影响滑带土凝聚力残余值的主要矿物为绿泥石。

Canonical correlation analysis between shear strength and mineral composition of sliding zone soil

The shear strength characteristic of sliding zone soil is a key factor affecting landslide stability and controlling land-slide deformation process. Mineral composition of sliding zone soil is one of the most important internal factors affecting its shear strength characteristics. The sliding zone soil collected from No.Ⅰ-1 landslide in Diaozhongba landslide group in Three Gorges Reservoir area has been studied to discuss the variation of mineral content of sliding zone soil under different saturation conditions and analyze the canonical correlation between shear strength and mineral composition of sliding zone soil. So the role of mineral composition in sliding zone soil shear strength characteristics can be further explained. The results show that with the increase of saturation time, the clay mineral content in sliding zone soil decreases at first and become stable then;there is a significant corre-lation between soil shear strength and its mineral composition;Montmorillonite and quatz are the main mineral compositions that affect the characteristics of peak value of cohesion and internal friction angel, while the chlorite affects the residual value of cohe-sion most.