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

作　　者：龚学强 蹇代君[2] 胡卸文[1,3] 张瑜[1] 郎介 泽军 蒋清明 GONG Xueqiang;JIAN Daijun;HU Xiewen;ZHANG Yu;LANG Jie;ZE Jun;JIANGQingming(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China;Jiuzhaigou Scenic Spot Administration,Aba Tibetan and Qiang Autonomous Prefecture,chengdu 623400,China;Engineering Laboratory Ccombined with National and Local of Spatial Information Technology of High-Speed Railway Operation Safety,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学地球科学与工程学院,成都四川611756 [2]九寨沟风景名胜区管理局,四川阿坝州藏族羌族自治州四川623400 [3]西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室,成都四川610031

出　　处：《灾害学》2024年第4期192-199,共8页Journal of Catastrophology

基　　金：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)。

摘　　要：位于九寨沟世界遗产保护区内的熊猫海—五花海段危岩区,历经“5·12”汶川地震和“8·8”九寨沟强烈地震,崩塌落石频发,成为了控制性特大地质灾害点。该文通过现场调查、无人机测绘,查明了震后震裂山体(危岩)空间分布位置和崩塌落石堆积特征,并结合RocPro3D数值模拟,探讨了高位震裂山体(危岩)崩塌落石运动特征和危害程度。结果显示,熊猫海—五花海段震裂山体落石灾害频发,影响景区道路总长度约1045 m,且在长期差异性风化作用下,崩塌落石灾害危险性有逐渐增大的趋势。危岩Ⅳ区落石模拟结果得到,崩塌落石冲击能量和运动速度整体上呈现先增大后减小的特点,落石达到景区道路的最大冲击能量、弹跳高度和运动速度分别为8673kJ、11.63 m和53.8 m/s,其中WYD3到达块石数量占比最大,达到68.6%,落石直接到达日则沟的块石数量占比小,但平均能量达到1770kJ。基于震裂山体(危岩)分布高位陡坡、成灾动力学强、危害性大,提出以景区道路改为隧道方案,以确保景区运行安全。The Panda lake-Five flower lake dangerous rock area,situated on the right side of Rize ditch in the Jiuzhaigou 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 formation 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 trajectory of existing rockfall are identified.Then No.Ⅳdangerous 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(dangerous 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 arriving Rize ditch is 1770 kJ.Based on the presence of shattered mountains(dangerous rock area)characterized by high steep slopes,intense disaster

关 键 词：九寨沟震区 震裂山体 崩塌 运动特征 RocPro3D 

分 类 号：X915.5[环境科学与工程—安全科学] X43