陕西宝鸡市新近系硬粘土工程地质特性 与斜坡失稳效应

陕西宝鸡市新近系硬粘土包括风成三趾马红土和“古三门湖河湖相堆积”的硬粘土，是西北地区典型的硬粘土地层之一，也是控制宝鸡市北坡黄土塬边大型滑坡分布的关键地层。为了深入认识该类特殊岩土，尤其是膨胀性粘土矿物（蒙脱石和其混层矿物），根据该类地层的空间分布特征采集了30多个岩土样品，在宏观与细观结构特征分析基础上，利用移液管法、精细X-射线衍射（XRD）技术、乙二醇与乙醚极性有机分子吸附法，完成了样品粒度成分的定量分析和粘土矿物的精细测定，分析其膨胀势，并结合区域滑坡分布与工程边坡病害，揭示其边坡灾害效应。

Engineering geological properties of Neogene hard clays in Baoji City area, Shaanxi Province, and their effect on slope failure

Neogene hard clays composed of Aeolian hipparion clay and palaeo Sanmen Lake fluvial deposit clay in Baoji City area of Shaanxi province constitute typical hard clay formation in the southern part of China's loess plateau and also make up the sensitive and key controlling strata in the development of large-scale deep-seated loess slides along the slope of the Loess Yuan on the northern bank of the Weihe River. In order to recognize this type of special sedimentary material, especially the swelling clay mineral (montmorillonite and its mixed layer mineral), the authors collected more than 30 samples according to the spatial distribution features of the clay strata, and then analyzed macroscopic and microscopic structural characteristics. Pipette method, fine X-ray diffraction (XRD) technology, and glycol ether polar organic molecular adsorption method were used to conduct a quantitative analysis of sample granulometric composition and high accurate determination of clay mineral composition. In addition, a brief analysis of expansive characteristics and slope failure relationship between Neogene hard clays was carried out in combination with landslide distribution and slope failure features.