摘要
位于云南东北部的鲁甸县是我国地质灾害高发的区县之一,2014年前,县域内共有各类地质灾害隐患点248处;2014年"8.03"鲁甸Ms6.5地震后,县域内各类地质灾害隐患点增至671处,其中滑坡382处,崩塌244处,滑坡崩塌占地质灾总数93.3%,是鲁甸县主要的地质灾害。通过在区内开展1∶5万标准分幅地质灾害调查,查明了龙头山镇图幅地质灾害发育分布特征与孕灾地质背景条件:(1)牛栏江及其支流两岸斜坡高陡,为地质灾害发育提供了地形条件;(2)顺(向)斜坡与碎裂状、散体状结构岩土体是地质灾害发育的物质基础;(3)北、北东向的断裂与向斜构造控制着地质灾害的发育和分布;(4)泥岩、页岩、砂泥岩等易崩易滑软弱岩层和风化界面对滑坡具有控制效应;(5)岩体的风化程度、岩溶效应、结构面发育程度等对滑坡发育也具有控制效应。
Ludian County,located in the northeast of Yunnan,is one of the counties that is suffered with highly frequent geological hazards in China and there were 248 potential geological hazards in the county area before 2014.However,all kinds of potential geological hazard points increased to 671 after the"8.03"Ludian Ms6.5 earthquake in 2014,including 382 landslides and 244 collapses,accounting for 93.3%of the total geological disasters.Based on the survey of 1:50000 standard sheet in the region,the distribution characteristics and the geological settings of the hazards were identified:(1)The high and steep slope banks of the Niulanjiang River and its tributaries provide topographic conditions for the development of geological hazards;(2)The synclines(consequent)slope and cataclastic,scattered structure rock mass are the material foundation of geological disaster development;(3)The fracture and syncline structure of north and northeast directions control the development and distribution of geological hazards;(4)Mudstone,shale,mud sandstone and other vulnerable strata and weathering interface have control effect on landslides;(5)The weathering degree of rock mass,karst effect and structural surface development degree also have control effect on the landslide development.
作者
杨秀元
YANG Xiuyuan(Center for Hydrogeology and Environmental Geology Survey,China Geological Survey,Baoding 071051,China)
出处
《人民长江》
北大核心
2018年第17期57-61,65,共6页
Yangtze River
基金
国家自然科学基金项目(41402322)
中国地质调查局地质调查二级项目(DD20160277)
中国地质调查局地质调查工作项目(1212011220164)
关键词
滑坡
断裂
地质灾害
云南鲁甸
landslide
fracture
geological hazard
Ludian County
