盐锅峡库区黄土台缘滑坡研究  

Study on the Landslides at the Edge of Loess Terrace in Yanguoxia Reservior Region

作　　者：赵尚学[1] 李鸿琏[1] 马东涛[1] 

机构地区：[1]中国科学院兰州冰川冻土研究所

出　　处：《水土保持通报》1995年第1期19-22,58,共5页Bulletin of Soil and Water Conservation

摘　　要：该文通过对黑方台黄土台缘滑坡进行深入细致的野外调查和测量、地下水观测、灌溉试验、水样和土样的物理化学分析，初步摸清了台缘滑坡的基本要素，分布特征、规模及危害，并查明了滑坡成因机制。据统计，该区有大小滑坡４４处，１９８６年至今发生滑坡２０多次，滑坡面积从０．２～２．５ｍ￣２不等。仅１９８９年以来，滑坡造成的直接经济损失近６００万元，平均每年近１２０万元。从野外观察和室内分析认为，该区台缘滑坡主要是由台面灌溉水下渗转为地下水，在台缘中下部以泉水形式溢出，或在砾石层底部和老滑坡底部出露，使砾石层底部泥岩被水浸泡软化成泥，当受压蠕动后便形成滑动带。有利的台缘地层和高陡的台缘地形也是引起滑坡的重要因素。Through the field investigation and measurement,groundwater observation,irrigationtesting and the physical and chemical analysis of water and soil samples.this paper has prelimilarilydiscussed the sliding basic factors,distribution features,scale and harm of the landslides at the edgeof terrace,the formation mechanism of landslide is established as well.According to statistics,thereare 44 landslide in this region. From 1886 up to now,more than 20 Landslides have happened,thesliding ares of landslides varies from 0.2 to 2.5Km￣2,Since 1989,the direct economic loss caused byIandslide reached nearly 6 000 000 yuan by the average of 1 200 000 yuan per year.By the field ob-servation and indoor analysis,we think that the landslide in this region is generated by the ground-water from infiltration of irrigation water,the ground water expose in spring flow at the down partof slope。or bottom of pebble layer and the bottoln of old landslide。the mudstone at the bottom ofpebble layer is soften to mud by water,while it is comperessed and influenced,the sliding beIt willbe formed.The special stratum and high-steep slope landforms are all the essential factors for in-ducing of landslides.

关 键 词：库区 黄土 台缘 滑坡 盐锅峡 

分 类 号：P642.22[天文地球—工程地质学]