灾害学2024,Vol.39Issue(4):192-199,8.DOI:10.3969/j.issn.1000-811X.2024.04.028
九寨沟强震区熊猫海—五花海段震裂山体发育特征及崩塌动力学分析
Development Characteristics and Kinematic Analysis of Rockfall from Shattered Mountain in the Panda Lake to Five-Flower Lake,Jiuzhaigou Strong Earthquake Area
摘要
Abstract
The Panda lake-Five flower lake dangerous rock area,situated on the right side of Rize ditch in the Jiu-zhaigou Valley Scenic and Historic Interest Area World Heritage Area,has undergone two significant earthquakes,namely the"5.12"Wenchuan earthquake in 2008 and the"8.8"Jiuzhaigou earthquake in 2017.These events have led to the forma-tion of high shattered mountains and increased occurrences of rockfall,turning this area into a controlling geological disaster point affecting the scenic area reopened after the"8.8"Jiuzhaigou earthquake.Based on on-site investigation and drone mapping,the spatial distribution of post earthquake shattered mountains(dangerous rock area)as well as the movement tra-jectory of existing rockfall are identified.Then No.Ⅳ dangerous rock area is selected a representative example to make the RocPro3D numerical simulation analysing the initiation and movement process of rockfall in high shattered mountains(dan-gerous rock area),and clarifying rockfall movement characteristics and hazard extent.The results show that the Panda lake~five flower lake shattered mountains are prone to frequent rockfall,affecting scenic roads with 1045m total length.The hazard extent of rockfall is gradually increasing due to the tensile fissures at the rear edge have extended towards the interior slope,and the formation of reentrant under the long-term differential weathering.The rockfall simulation results of No.Ⅳdangerous rock area shows that the impact energy and movement speed of rockfall exists an overall trend of first increasing and then decreasing.The maximum impact energy,rebound height,and movement speed of rockfall reaching scenic roads are 8673 kJ,11.63 meters,and 53.8 m/s,respectively.WYD3 dangerous rock zone accounts for the largest proportion of blocks,reaching 68.6%.The blocks proportion of reaching Rize ditch directly is small,while average impact energy arriv-ing Rize ditch is 1770 kJ.Based on the presence of shattered mountains(dangerous rock area)characterized by high steep slopes,intense disaster dynamics,and substantial damages,which seriously threatens the safety of scenic road operation and the ecological resources of Rize ditch,a plan is proposed to convert the scenic roads into tunnels to ensure the safe oper-ation of the scenic area.关键词
九寨沟震区/震裂山体/崩塌/运动特征/RocPro3DKey words
Jiuzhaigou earthquake area/shattered mountain/rockfall/kinematic characteristic/RocPro3D分类
资源环境引用本文复制引用
龚学强,蹇代君,胡卸文,张瑜,郎介,泽军,蒋清明..九寨沟强震区熊猫海—五花海段震裂山体发育特征及崩塌动力学分析[J].灾害学,2024,39(4):192-199,8.基金项目
国家重点研发计划项目"地质灾害生态防治韧性技术与装备"(2023YFC3007103) (2023YFC3007103)