汶川县崩塌地质灾害发育规律研究

Study on Development Rule of Collapse Geological Disaster in Wenchuan County

汶川县地属川西北中、高山区,地质环境脆弱,尤其是在汶川大地震之后,该区域内的崩塌地质灾害更加发育。在2016年汶川县1∶5万地质灾害详查的基础上,通过分析崩塌地质灾害点的个数与岩性、地貌、斜坡坡度、斜坡坡向、崩塌方量之间的关系,得出汶川县崩塌地质灾害发育规律,可知汶川地区崩塌主要是岩质崩塌,主要发育在灰岩、砂岩等沉积岩中;崩塌主要沿着岷江河谷地貌和两岸中山发育;崩塌多发育在坡度为60°~90°、斜坡坡向为90°~150°中;小型崩塌特别发育。

Wenchuan County belongs to the medium-high Mountains in northwest Sichuan and the geological environment is fragile, especially after the Wenchuan great earthquake, collapse geological disasters are more developmental. Based on the survey and investigation of 1：50000 geological disasters in Wenchuan County in 2016, the relationship between the number of collapse geological disasters and litho Iogy, topography, slope gradient, slope aspect and collapse scale was analyzed. It was known that the collapse of Wenchuan County mostly happened in rocks and develops in the limestone, sandstone and other sedimentary rocks. The collapse was mainly along the valley of the Minjiang River and the medium mountains. Most collapse disasters distribute in the region of slope between 60° to 90°, slope aspect between 90° to 150°. The small-scale collapse was specially developed.