勉县地质灾害分布与影响因素的相关性分析

受水文地质、工程地质条件及人类工程活动等影响因素的影响,勉县是陕南地区地质灾害的多发区。为了研究勉县地质灾害分布与影响因素之间的相关性,分别绘制了各影响因素与地质灾害分布的叠加图,并对其进行统计分析。得出结论:勉县地质灾害集中发育于汉江盆地年平均降雨量为850mm~900 mm的区域、中低山区和丘陵区以及志留系-奥陶系下统和侏罗系地层岩性区。地质灾害沿主要水系、断裂、公路等两侧一定范围内呈"带状"分布。汉江两侧1 km范围内灾害点最多,灾害点密度最大;勉县—略阳构造带两侧1 km范围内灾害点最多,灾害点密度最大;十天高速两侧1 km范围内灾害点最多,灾害点密度最大。分析结论为勉县移民搬迁项目和基础设施建设提供可靠的地质灾害防治依据。

Analysis of the Correlations Between Geohazard Distribution and its Factors in Mianxian

Geohazards happed a lot in Mianxian due to its hydrogeological conditions,engineering geological conditions and human engineering activities.In this paper the overlay maps of geohazards distribution and their factors were drew in order to study the correlations of geohazard distribution and its factors by statistical analysis.The results showed that:The geohazards located mainly in the area of the average annual rainfall of 850 ～ 900 mm near the Han river basin,the middle-low mountain regions and the hilly regions as well as the area of Lower Ordovician system,Lower Silurian system and Jurassic system.The geohazards developed along both sides of the main rivers,fractures and roads within a certain range as "bandings".The Han river,the Mianxian-Lueyang fracture and the Shiyan-Tianshui highway within 1 kilometer on both sides had the most geohazards and the greatest geohazard densities.The results could provide scientific and reliable basis for geological disaster prevention in migration relocation and infrastructure construction.