宁镇地区山前缓坡地层结构及其稳定性分析  

THE STRATIGRAPHIC STRUCTURE AND STABILITY ANALYSIS IN GENTLE SLOPES OF PIEDMONTAT NINGZHEN AREA

作　　者：阎长虹[1] 许宝田[1] 吴澄宇[2] 谈金忠 徐成华 郭书兰 刘羊 YAN Changhong;XU Baotian;WU Chengyu;TAN Jinzhong;XU Chenghua;GUO Shulan;LIU Yang(School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023;Nanjing Land and Resources Bureau, Nanjing 210008;The 1 st Geological Brigade of Jiangsu Geology and Mining Exploration Bureau, Nanjing 210041)

机构地区：[1]南京大学地球科学与工程学院,南京210023 [2]南京市国土资源局,南京210008 [3]江苏省地矿局第一地质大队,南京210041

出　　处：《工程地质学报》2019年第1期48-54,共7页Journal of Engineering Geology

基　　金：江苏省社会发展计划支撑项目(BE2015675);江苏省地质矿产勘查局科技项目(2015-KY-4)资助~~

摘　　要：近年来由于受极端强降雨天气的影响,宁镇地区山前缓坡发生多起中型-大型滑坡地质灾害,主要表现为间歇性蠕滑,规模较大,而滑移距离较小,一般小于30 m,该类滑坡严重威胁附近居民的生命和财产安全,造成巨大的经济损失和严重不良社会影响。为此,本文针对这一典型山前缓坡新型滑坡地质灾害,运用岩体结构控制论和优势面理论对其滑坡体地层结构及滑动机理进行研究,结果表明滑坡主要发生在山前缓坡地段,滑坡体具有特殊的地层结构及水文地质特性,受到强降雨作用时,在坡体内容易产生暂时性承压水,在其浮托力的作用下缓坡主要产生顶托破裂和剪切破坏,并随降雨产生间歇性蠕滑。In recent years, due to the influence of extreme heavy rainfall weather, many medium-sized and large-scale landslides had occurred on the gentle slopes of Ningzhen area. These landslides were mainly manifesting intermittent creep, large scale, and small slip distance, generally less than 30m, which seriously threatens the safety of lives and property of residents, and causes huge economic losses and serious adverse social effects. In the paper, based on this new type of landslide geological hazard, the stratum structure and sliding mechanism of the landslide had been researched by using the cybernetics of rock mass structure and preferred plane theory. The results show that the landslide mainly occurred in the Piedmont gentle slope area, and there are special stratum structure and hydrogeological characteristics of the landslide body. The confined water would be easily produced in the slope body with heavy rainfall. Under the action of buoyancy of confined water, the burst and shear failure would produce mainly in the gentle slope, and the intermittent creep of the landslide grow with rainfall.

关 键 词：宁镇地区 岩体结构控制论 优势面理论 山前缓坡地层结构 滑坡地质灾害 

分 类 号：P642.22[天文地球—工程地质学]