DISTRIBUTION CHARACTERISTICS AND INDUCING FACTORS OF LOESS LANDSLIDE IN MAIJI MAPPABLE UNIT, TIANSHUI
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摘要:
基于野外调查和室内资料综合整理, 对天水市麦积区幅范围内438处体积大于1×104 m3的黄土滑坡进行了分类统计对比分析。研究结果表明, 麦积区幅内黄土滑坡具有空间上发育不均衡, 时间上多期活动的特点, 表现为区域上黄土滑坡分布不均匀, 各区域滑坡体平均厚度差异大, 滑坡多沿沟谷呈不对称带状分布, 滑坡多发育在坡度为15°—30°斜坡上等。受地质构造、地形地貌、地层岩性等环境地质条件控制, 幅内滑坡主要是因地震和降雨诱发形成。
Abstract:According to field investigation and lab data statistics, a statistical classification is conducted on 438 loess landslides in which the volume is more than 1×104 m3 in MaiJi mappable unit.It shows that the characteristics of loess landslides are asymmetrical development in space and multiple stages in time. It is mainly reflected in the following ways: the distribution of loess landslides is inhomogeneous in regional, many differences appear in the average thickness of landslide in each region, landslides distribution is banded asymmetrical along the valleys, most landslides develop on the slopes with 15°—30°. Loess landslides in the MaiJi mappable unit are controlled by geological structure, topography and formation lithology. And Loess landslides are majorly induced by rainfall and earthquake.
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Key words:
- MaiJi mappable unit /
- loess landslides /
- classification /
- distribution characteristics /
- inducing factor
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