三峡库区万县复向斜构造特征及其与地质灾害分布关系  

Distribution Characteristics of Geological Disasters in Wanxian Syncline in Three Gorges Reservoir Area

作　　者：王岚[1,2] 许晓亮 周准 张凯元[1,2] WANG Lan;XU Xiaoliang;ZHOU Zhun;ZHANG Kaiyuan(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,Yichang 443002,China;College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2024年第1期49-56,共8页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(U2034203)。

摘　　要：万县复向斜位于川东褶皱带与大巴山-大洪山构造带复合部位,前人侧重于基础地质及页燃气勘探相关领域的研究,对于万县向斜局部构造特征与地质灾害的内在关系的研究尚少.本文在野外地质调查研究的基础上,利用部分滑坡的勘察资料,采用构造地质与工程地质的分析方法,深入研究了万县向斜局部构造对该区域地质灾害的控制作用,将万县向斜内部分为:西部NE向构造叠加构造区域;中部故陵向斜轴迹NE向区域;东部故陵向斜轴迹近EW向区域(也是故陵向斜翘倾消亡部位).与局部构造相对应,将内部地质灾害同样划分为西部、中部和东部3个区域进行研究,得出如下结论:西部地质灾害发育规模小,主要集中于局部纵谷地段;中部地质灾害集中于长江北岸,岩层陡缓倾角转化带的存在对地质灾害的规模起到了控制作用;东部地质灾害集中于长江南岸,除岩层陡缓倾角转化带的存在对地质灾害的规模起到了主要控制作用以外,斜坡坡长和岩层产状中陡倾的特点对地质灾害的发生同样具有重要的控制作用.本次研究阐明了万县复向斜内部构造特征与该地区地质灾害的内在联系,对研究区域内地质灾害的预测预报提供了一定的参考和依据.Wanxian syncline is located in the composite part of eastern Sichuan fold belt and Dabashan-Dahongshan structural belt.Previous studies focused on basic geology and shale gas exploration,but there are few studies on the internal relationship between local structural characteristics of Wanxian syncline and geological disasters.In this paper,based on field geological investigation and study,and by using survey data of landslides,structural geology,and engineering geological analysis method,the control effect of local structure of Wanxian syncline on geological disasters is studied in depth.The Wanxian syncline can be divided into three parts;i.e.,the western NE trending structure superimposed structure area,the NE-trending area of the central,and the EW-trending area of the eastern anticline(which is also the extinct part of the anticline).Corresponding to the local structure,the internal geological hazard is also divided into three regions;i.e.,western,central and eastern.The results show that the geological disasters in the westward part have a small development scale,mainly concentrated in the local longitudinal valley section;the geological disasters in the central part are concentrated in the northern bank of the Yangtze River,and the existence of the conversion zone of steep and gentle dip angles of strata has a controlling effect on the scale of geological disasters;the geological disasters in the east are concentrated in the south bank of the Yangtze River.In addition to the existence of the steep and gentle dip angle conversion zone of rock strata,the slope length and the characteristics of steep dip occurrence in rock strata also have important control effects on the scale of geology.The study results reveal the intrinsic relationship between the internal structural characteristics in Wanxian syncline and the geological disasters in the area,and provides a certain reference and basis for the prediction and prediction of geological disasters in the study area.

关 键 词：万县向斜 地质灾害 滑坡 局部构造 

分 类 号：P59[天文地球—地球化学]