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首页|期刊导航|灾害学|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

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

龚学强 蹇代君 胡卸文 张瑜 郎介 泽军 蒋清明

灾害学2024,Vol.39Issue(4):192-199,8.
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

龚学强 1蹇代君 2胡卸文 3张瑜 1郎介 2泽军 2蒋清明2

作者信息

  • 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. 西南交通大学地球科学与工程学院,成都 四川 611756||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
  • 折叠

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/RocPro3D

Key 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)

灾害学

OA北大核心CSTPCD

1000-811X

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