陕西省特大型滑坡空间分布规律与类型划分

发布时间：2018-11-08 19:09

【摘要】：特大型滑坡空间分布规律及其类型划分是研究其形成机理、致灾模式与风险减缓对策的重要基础。通过遥感解译、野外调查与解剖勘查等手段,查明陕西省特大型滑坡空间上具有明显的分布规律:在地貌上主要分布于关中盆地黄土塬边44处,其次是黄土梁峁、丘陵区22处,秦岭北坡6处,汉中盆地中低山区6处;在构造单元上分布于包括秦岭北坡断裂带在内的关中断陷盆地72处,汉中断陷盆地6处;在斜坡结构类型上,主要分布于黄土+泥岩型斜坡41处,其次为黄土+基岩型斜坡11处、黄土+红黏土型斜坡9处。特大型滑坡在空间分布上受活动断裂、地貌单元与斜坡结构类型的控制,不同区域发育特大型滑坡类型不同,特大型滑坡类型划分为宝鸡黄土塬边黄土—泥岩顺层型、灞桥白鹿塬边黄土—红黏土逆层型、蓝田横岭地区黄土—红黏土接触面型、关中盆地渭北地区黄土—基岩接触面型、陇县北部及韩城黄土梁峁区岩土混合型以及秦岭北坡与陕南"勉略宁"地区的堆积层型、顺向或块状岩质型滑坡等。
[Abstract]:The spatial distribution and classification of super-large landslides are the important basis for studying their formation mechanism, disaster pattern and risk mitigation countermeasures. By means of remote sensing interpretation, field investigation and anatomical exploration, it is found that there are obvious spatial distribution laws of super large landslides in Shaanxi Province: 44 places on the loess plateau edge of Guanzhong Basin, followed by loess knolls, and 22 places in hilly areas. There are 6 places on the northern slope of Qinling Mountains and 6 in the middle and low mountain areas of Hanzhong Basin. The tectonic units are distributed in 72 Guansuo and 6 Hanzhong faulted basins, including the northern slope fault zone of Qinling Mountains. In terms of slope structure, it is mainly distributed in 41 loess mudstone slopes, followed by 11 loess bedrock slopes and 9 loess red clay slopes. The spatial distribution of super large landslides is controlled by active faults, geomorphological units and slope structure types. The types of super large landslides are different in different regions. The types of super large landslides are divided into loess and mudstone bedding types on the edge of Baoji Loess Plateau. The loess-red clay inversion type in the edge of Baqiao Bailu plateau, the loess-red clay contact surface type in the Hengling area of Lantian, and the loess-bedrock interface type in the Weibei area of Guanzhong Basin. In the northern part of Longxian and Hancheng Loess knoll area, the mixed rock and soil type, the accumulation layer type in the north slope of Qinling Mountains and the "Mianliuanning" area in the south of Shaanxi Province, the direct or massive rock type landslide and so on.
【作者单位】：国土资源部黄土地质灾害重点实验室;中国地质调查局西安地质调查中心;
【基金】：中国地质调查局地质调查项目“陕西省特大型滑坡调查与风险评价”(1212010814027);“吕梁山区城镇地质灾害调查”(DD20160276)
【分类号】：P642.22

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