降水对陇西黄土滑坡的诱发作用及时空影响分析

发布时间：2018-01-30 08:24

本文关键词： 黄土滑坡降水诱发作用影响分析甘肃陇西　出处：《冰川冻土》2017年03期 　论文类型：期刊论文

【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。
[Abstract]:Based on the field investigation and test data, changing the topography and geomorphology from precipitation (mainly heavy rain or continuous rain) promotes the formation of landslide, changes the composition of landslide soil, and changes the structure and stability of landslide soil. The paper expounds the inducing effect of changing the mechanical strength of landslide soil on loess landslide and selects the series precipitation data of typical cities and the number of landslides. The temporal and spatial effects on loess landslide are discussed in three aspects: precipitation process and precipitation spatial variation. The frequency of landslide occurrence in the same region is well correlated with the precipitation process in the same region. There is a rule that the number of landslides occurs in the high water year is more than that in the dry year, the number of landslides in the year of high water is 3 5 times that in the dry year, and the number of landslides in the year of low water is 1 / 2 times of that in the year of low water. Landslides occurred mainly in June-September and 2-3 months, accounting for more than 80% of the total number of landslides in the whole year. In different regions, the higher the annual precipitation and rainfall intensity, the higher the frequency and scale of loess landslide. From southeast to northwest, with the decrease of precipitation and rainfall intensity, the loess landslide is divided into three regions: the strong developed area, the stronger developed area and the general developing area.
【作者单位】：甘肃省地矿局第二地质矿产勘查院;甘肃省地质矿产勘查开发局;甘肃省科学院地质自然灾害防治研究所;
【基金】：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
【分类号】：P642.22
【正文快照】： 0引言降水引发的黄土滑坡因其发生率高、危害大、分布广,一直是国内外前沿研究对象。大量的研究表明,绝大多数黄土滑坡与大气降水以及由此形成的地下水(泉水)、地表径流有着紧密的联系,学术界一直存在“无水不滑”之说[1]。戴福初[2]、严绍军等[3]、宁社教等[4]从土体的应力应

【相似文献】