黄土滑坡典型工程地质问题分析

黄土滑坡是西北地区最为严重的地质灾害。随着西部经济的发展及工程活动的加强,黄土滑坡成为近年工程地质研究的热点问题。黄土滑坡后缘地裂缝发育,具有高陡的后壁以及演化特征。泾阳南塬自1976年大面积农业灌溉以来,发生了27处50余起黄土层内滑坡。2005年～2007年6月,对南塬黄土滑坡进行了多次现场调查和滑坡特征测量,获得了详实的野外资料。在现场工作的基础上,初步分析了地下水位上升诱发高速远程滑坡机制、塬边地裂缝成因机制、滑坡高陡后壁成因机制及其稳定性评价方法及黄土滑坡演化机制与演化平衡等当前黄土滑坡研究亟待解决的工程地质问题。

Analysis of some special engineering-geological problems of loess landslide

Loess landslide is the most catastrophic geohazard in the northwest area of China. Non-earthquake-triggered loess landslides have occurred frequently in recent years with the development of economy and the increase of human activities in this area. The following features are representative for most loess landslides: crack development, steep backscarp, and retrogressive occurrence at the same site. The groundwater table in the South Jingyang Plateau, Shaanxi Province, has been significantly raised since 1976 and more than 50 landslide events at 27 sites have occurred. From 2005 to June 2007, several field investigations were taken at South Jingyang Plateau and the characteristics of loess landslides were studied. Some special engineering-geological problems of loess landslide are analyzed including the initial, travel mechanisms of long runout loess landslides, crack developing mechanisms, steep backscarp forming mechanisms and its stability assessment, landslide evolvement mechanisms. Based on the field works, the above mentioned engineering-geological problems are discussed.