刘伟 袁湘秦 连海波

摘要 以陕南地区28个市（县、区）的地质灾害详细调查成果为基础，统计了区内3 213处堆积层滑坡，并选取典型堆积层滑坡进行了野外调查，研究区内堆积层滑坡发育规律。结果表明：堆积层滑坡空间分布受地层岩性、地貌、地质构造、降雨及人类工程活动控制。发生时间与区内降雨时间一致，主要集中分布于每年6—10月;区内堆积层滑坡主要为小型、浅层堆积层滑坡。滑动面位置主要为土-岩接触面，倾角为20°～40°，滑体物质主要为碎石土，滑带物质主要为残坡积土，细粒含量高，遇水饱和后强度极低。该研究结果为区内堆积层滑坡的防灾减灾工作提供一定的理论支持。

关键词 陕南地区;堆积层滑坡;发育规律;降雨

中图分类号 P642.22文献标识码 A文章编号 0517-6611（2021）10-0194-04

doi：10.3969/j.issn.0517-6611.2021.10.050

开放科学（资源服务）标识码（OSID）：

Study on the Development Laws of Accumulation Landslide in Southern Shaanxi

LIU Wei1，YUAN Xiang-qin2， LIAN Hai-bo1

（1.Shaanxi Provincial Land Engineering Construction Group， Xian，Shaanxi 710075;2.Shaanxi Institute of Engineering Prospecting Co.，Ltd.，Xian，Shaanxi 710054）

Abstract Based on the detailed investigation results of geological hazards in 28 cities （counties or districts） in southern Shaanxi，3 213 landslides in the region were statistically analyzed and typical landslides in the region were selected for field investigation.The development characteristics of accumulation landslide in the region were studied.The results showed that the spatial distribution of landslide was controlled by strata， morphology， geological structure， rainfall and human engineering activities.The occurrence time was consistent with the rainfall time in the region， which was mainly distributed from June to October every year.The landslide of accumulation layer in the region was mainly small and shallow.The sliding surface was mainly the soil-rock contact surface with a dip angle of 20°-40°.The material of the sliding body was mainly gravel soil and the material of the sliding belt was mainly residual slope soil. The fine grain content was high and the strength was very low when saturated with water.The research results provided some theoretical supports for the disaster prevention and reduction of accumulation landslide in the region.

Key words Southern Shaanxi;Accumulation landslide;Development laws;Rainfall

陜南地区地处秦巴山地，是陕西省受地质灾害危害最严重的地区，同时也是我国陇南陕南秦巴山地泥石流滑坡重点防治区[1]。近年来，陕西省内的灾难性地质灾害大都发生于该区域[2-7]。2011年9月，受极端暴雨天气的影响，陕南全境共发生地质灾害537起，造成47人死亡失踪，直接经济损失约1.08亿元。地质灾害极大地威胁着当地居民的生命和财产安全，在一定程度上制约了当地经济的发展，成为陕南地区最具代表性的地质环境问题之一。

据陕南地区28个市（县、区）的地质灾害详细调查成果，陕南地区现有发育地质灾害共4 177处，其中滑坡3 610处、崩塌314处、泥石流219处、地面塌陷34处。滑坡占地质灾害总数的87%，其中堆积层滑坡发育有3 213处，占滑坡总数的89%。……