甘肃陇南强震区滚石灾害危险性评价

Hazard Assessment of Rockfall in Highly Seismic Region Longnan,Gansu

依据大量的现场调查,研究了工程地质岩组、断层密度、坡度、坡高、地震峰值加速度、日平均最大降水量和植被盖度7个要素对滚石灾害影响的层次性和差异性,并利用层次分析模型(AHP)和GIS获得了研究区滚石的危险性分布地图,对陇南强震区的滚石灾害进行了危险性评价。深入研究滚石与不同影响要素的相关性是进行滚石区划的基础,本文的滚石灾害危险评价方法具有一定的应用价值。

What causes rock-fall is the influence of inner formation conditions and external trigger factors. Based on a lot of field investigations and laboratory study, the paper does the research on that how different factors exercise the multiple-layered and different influences on rock-fall, such as engineering geological rock group, fault density, grade, slope height, PGA, average daily maximum precipitation and vegetation coverage. Using analytical hierarchy process and geo- graphical information systems, the paper gets the map of hazard distribution of rock-fall and con- ducts hazard assessment of rock fall in highly seismic region of Longnan, Gansu. It is the basis that doing research into correlation between different influence factors and rock-fall, and the method of rock-fall hazard analysis and zonation presented in this paper has some practical value.