湘西铁路沿线红层边坡工程地质研究

Engineering geology study on failure of red beds slopes along railway in the west of Hunan Province

地处湘西山区的湘黔、焦柳铁路沿线分布众多的红层边坡。因其工程地质条件的特殊性,边坡灾害时有发生,严重影响了列车的安全运行。文章首先对这一地区红层的工程地质特性进行研究,在此基础上,对边坡破坏形式、规律、机理等进行深入探讨。研究表明:分布在湘西铁路沿线的红层具有岩性多变、软硬互层、浸水崩解、遇水软化、结构面众多及泥化软弱夹层发育等工程特性;红层边坡变形破坏的主要形式有风化剥落、坡面变形、崩塌落石和顺层滑坡等。文章通过湘西湘黔、焦柳铁路沿线12处较大红层路堑滑坡的调查及综合分析,得出这一地区红层路堑滑坡形成的基本规律并根据滑坡体物质及滑动面特征对其进行了分类。分析了该地区红层滑坡的形成机理并提出红层边坡地质灾害的防治措施。

There are many red beds slopes along the Xiangqian and Jiaoliu railway located in west mountain of Hunan Province . Because of the red rock in the area has more particularity on the part of engineering geology character, slope failure occurred frequently in the past. For this reason, the engineering character of red beds and slope failure occurred in the area are studied in this paper firstly. Then, base on above research, the style, law and mechanism of slope failure are studied. The research findings show： the red beds along railway located in west of Hunan province is characterized by lithologic character diversification, soft and hard terrane alternate layer, easy disintegrating and softening in the action of water; much structural plane and weak intercalation; the deformation and failure style of red beds slopes in the area is flaking off in the action weathering, slope shape distorting, dilapidating, rockfall and consequent landslide, etc. The law of landslide forming in the area is revealed by the investigation and research of 12 large landslides occurred in the area, the style of landslide also is classified based on landslide mass and slip plane character. Base on above research, the deformation and failure mechanism of red beds slop is analysed in this paper. Finally, the preventing and harnessing means for red beds slope geologic hazard is presented.