湖北省保康县地质灾害分布特征及发育规律研究

Research on the Distribution Characteristics and Development Law of Geological Disasters in Baokang County,Hubei Province

保康县位于鄂西北山区,是地质灾害高易发区。依据地质灾害详细调查成果资料,分析保康县地质灾害分布特征与成因机制,总结地质灾害发育规律。结果表明,保康县发育地质灾害类型主要为滑坡,规模以小型为主;在地域分布上主要集中于马桥镇、城关镇和寺坪镇;在高程分布上,主要集中于500~1000 m中低山区以及200~500 m低山区;在坡度分布上,陡坡地形(坡度为25°~40°)分布地质灾害最多;在工程地质岩类分布上,有66.19%的地质灾害集中于碎屑岩类地区;在构造单元分布上,沿断裂构造带两侧密集发育;在时间分布上,主要集中于汛期7—8月。保康县地质灾害发育受地形地貌、地层岩性、地质构造等内在因素控制,在降雨和人类工程活动等外部因素诱发下导致了各类地质灾害的发生。研究成果为保康县防灾减灾和制定区域防灾规划提供基础地质依据。

Baokang County is located in the mountainous area of northwestern Hubei and is a high-prone area for geological disasters.Based on the detailed investigation results of geological disasters,the distribution characteristics and genetic mechanism of geological disasters in Baokang County are analyzed,and the development law of geological disasters is summarized.The results show that the types of geological disasters in Baokang County are mainly landslides,and the scale is mainly small.The geographical distribution is mainly concentrated in Maqiao Town,Chengguan Town and Siping Town;in elevation distribution,geological disasters are mainly concentrated in 500~1000 m low mountain and 200~500 m low mountain;in terms of slope distribution,steep slope terrain(slope of 25°~40°)has the most geological disasters;in the distribution of engineering geological rocks,66.19%of geological disasters are concentrated in clastic rock areas;in the distribution of tectonic units,they are densely developed along both sides of the fault structural belt;in the time distribution,mainly concentrated in the flood season June to August.The development of geological disasters in Baokang County is controlled by the internal factors such as topography,lithology and geological structure.The occurrence of various geological disasters is induced by external factors such as rainfall and human engineering activities.It provides basic geological basis for disaster prevention and mitigation and regional disaster prevention planning in Baokang County.