滑带土粘土矿物定向性的x射线衍射及其对滑坡的作用

本文首先论述了粘土矿物颗粒定向排列测定的基本原理并提出粘土矿物定向性定量评价方法,然后根据实例—庙上北滑坡的滑带土粘土矿物的X射线衍射结果,进行定向性定量分析计算,得出滑带土粘土矿物颗粒的定向度为弱到中等定向,并以中等定向为主。因而在水的往返作用下,滑带土具一定的胀缩性及胀缩的不均匀性,再加上粘土矿物本身亦具有的胀缩性及胀缩的可逆性和循环性,故导致滑带土抗剪强度和结构强度不断降低,大大影响斜坡的稳定性。

Study on x-ray diffraction for the orientability of clay minerals in sliding-soil

At first, the basic measured principles for the orientable arrangement of clay minerals is discussed and the methods of the quantitative appraisement for the orientability of clay minerals are given in this paper. And then, According to the result of x-ray diffraction for the clay minerals of the sliding-zone soil of Biaoshangbei Landslide, the orientability of clay minerals had been quantitative analyses and calculation. They show that the clay minerals in the sliding-zone soil are low to moderate orientation (mainly moderate orientation). So the sliding-zone soil has expansibility and shrinkage as well as inhomogeneity of expansion and shrinkage under the effects of water, and the expansibility and shrinkage of clay minerals themselves, reversibility and circulation of expansion and shrinkage . They may cause the shear strength and structural stability of sliding-zone soil to deduce continuously and landslide.