秦巴山区滑坡发育规律研究

Study on development patterns of landslide in Qinling-Bashan Mountains

文章以南郑、城固两县为例,对秦岭、巴山东段米仓山地区的滑坡发育规律进行了调查研究,调查面积5092 5km2,发现各类地质灾害184处,其中滑坡164处,占总数的89 1%,受威胁人口6300人。研究认为秦巴山区是我国滑坡发育的重灾区,对人民的生命财产构成了巨大的威胁,滑坡类型以堆积层小型滑坡为主,其发育与地形地貌、降雨、地层构造和人类工程活动关系密切,多发生在低山丘陵区,多雨年份和每年7～9月的雨季是滑坡的多发季节,由于山区地少人多,耕地紧张,当地居民建房多开挖坡脚,从而引起山体失稳,形成滑坡,危及人民生命财产安全。鉴于该地区的滑坡多以小型滑坡为主,危及对象多为单家独户,滑坡治理工程费用高,因此防治方法应以"避让"为主。同时提高当地群众的地质灾害防范意识和科学知识,也是防治滑坡灾害的必要手段。

Taking Nanzheng and Chenggu counties as examples landslide's development regulation in Qinling and Bashan mountatinous is studied on the basis of surveying Micangshan area which is the eastern section of the mountains.By investigating 5092.5?km^2 area,184 geologic disasters have been discovered,in which there are 164 landslides,89.1% of the total amount,which threaten 6300 people.It is the heavy disaster area of landslip in our country,and people's lives and properties are threatened seriously.The main type of landslide in this area is small scaled landslide composed with constructional layer.The landslides'forming conditon is closely related to geography,rainfall,the geologic strata structure and human engineering activities.Most landslides occurred in low mountains and hills in rainy seasons(from July to September) each year and in years with heavy rainfall.Many landslides happened because the slopes'feet were cut by residents to build houses.Since most landslides are in small size and threaten many separated families,and the control project will cost much,so the better preventing mothed is keeping buildings and residents to avoid the landslides.At the time,it is necessary for the local people to increase their knowledge of preventing geo-hazards.