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冰川冻土 ›› 2017, Vol. 39 ›› Issue (3): 609-615.doi: 10.7522/j.issn.1000-0240.2017.0068

• 寒区科学与技术 • 上一篇    下一篇

降水对陇西黄土滑坡的诱发作用及时空影响分析

魏林森1, 丁宏伟2, 王婷1, 康亮2, 张凌鹏1, 王国亚3   

  1. 1. 甘肃省地矿局 第二地质矿产勘查院, 甘肃 兰州 730020;
    2. 甘肃省地质矿产勘查开发局, 甘肃 兰州 730000;
    3. 甘肃省科学院 地质自然灾害防治研究所, 甘肃 兰州 730000
  • 收稿日期:2017-01-13 修回日期:2017-03-19 出版日期:2017-06-25 发布日期:2017-09-09
  • 作者简介:魏林森(1963-),男,甘肃榆中人,高级工程师,2016年在中国地质大学(武汉)获得学士学位,从事地质灾害及水文地质勘查研究评价工作.E-mail:3451880@qq.com.
  • 基金资助:
    甘肃省国土厅黄土滑坡地质灾害研究项目(20150021);甘肃省科学院应用研发项目(2014JK-05)资助

Loess landslide in Longxi of Gansu Province:precipitation inducted function and space-time effect

WEI Linsen1, DING Hongwei2, WANG Ting1, KANG Liang2, ZHANG Lingpeng1, WANG Guoya3   

  1. 1. Second Institute of Geological and Mineral Exploration of Gansu Province Bureau of Geology and Mineral Resource, Lanzhou 730020, China;
    2. Gansu Bureau of Geology and Mineral Exploration and Development, Lanzhou 730000, China;
    3. Geological Hazards Prevention Institute, Gansu Academy of Sciences, Lanzhou 730000, China
  • Received:2017-01-13 Revised:2017-03-19 Online:2017-06-25 Published:2017-09-09

摘要: 以现场调查、试验测试数据为依据,从降水(主要指大暴雨或连阴雨)改变地形地貌促使滑坡形成、改变滑坡土的成分构成、改变滑坡的土体结构及稳定性、改变滑坡土的力学强度4个方面阐述了对黄土滑坡的诱发作用。选择典型城市的系列降水资料及发生滑坡数量,从多年降水、年内降水过程及降水的空间变化3个方面阐述了对黄土滑坡的时空影响。年际上,同一区域滑坡发生的频次与多年降水过程呈现良好的相关性,存在丰水年发生滑坡次数多、规模大而枯水年发生滑坡次数少、规模小的规律,丰水年发生滑坡数量一般是枯水年的3~5倍、平水年的1~2倍;年内滑坡集中出现于6-9月份和2-3月份,占全年滑坡数量的80%以上;不同区域,年降水量及降水强度越大,黄土滑坡发生频率越高,规模也越大;自东南向西北,随着降水量及降水强度的递减,依次划分为黄土滑坡强发育区、较强发育区和一般发育区。

关键词: 黄土滑坡, 降水, 诱发作用, 影响分析, 甘肃陇西

Abstract: In this paper, based on in-situ investigation and test data, the landslide type and characteristics in the Longxi Loess Plateau of Gansu Province were summarized, the formation mechanisms of the loess landslide were analyzed from four aspects:change in topography, change in landslide composition, change in landslide soil structure and change in landslide mechanical strength, which were all caused by atmospheric precipitation (mainly by heavy rain or continuous rain). According to precipitation and the number of landslide event in some typical areas, the impact and effect of atmospheric precipitation upon the landslide were described from three aspects (including annual precipitation, precipitation process and precipitation space-time change features). In the same area, it was found that there was a good correlation between the landslide frequency and annual precipitation, for instance, in wet years the number of landslide event was 3~5 times than that in dry years and 1~2 times than ordinary year. During a year, the landslide concentrated from June through September and from February through March, when the number of landslide event accounted for more than 80% of the total. In various regions, the larger the precipitation and rainfall intensity, the higher the loess landslide occurrence frequency and the larger the landslide scale. From southeast to northwest, with decreasing precipitation and rainfall intensity, there were, in turn, loess landslide stronger development areas, strong development areas and general development areas.

Key words: loess landslide, precipitation, induced effects, impact analysis, Longxi in Gansu Province

中图分类号: 

  • P642.22