[1]张蕴灵,傅宇浩,李为乐*,等.2020年9月20日雅西高速姚河坝崩塌调查[J].山地学报,2021,(3):450-460.[doi:10.16089/j.cnki.1008-2786.000610]
　ZHANG Yunling,FU Yuhao,LI Weile*,et al.Preliminary Investigation on the Yaoheba Rockfall along the Ya'An-Xichang Highway on September 20, 2020, Sichuan, China[J].Mountain Research,2021,(3):450-460.[doi:10.16089/j.cnki.1008-2786.000610]
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2020年9月20日雅西高速姚河坝崩塌调查()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2021年第3期
页码:
450-460
栏目:
研究简报
出版日期:
2021-05-25

文章信息/Info

Title:
Preliminary Investigation on the Yaoheba Rockfall along the Ya'An-Xichang Highway on September 20, 2020, Sichuan, China
文章编号:
1008-2786-(2021)3-450-11
作者:
张蕴灵1; 傅宇浩1;  李为乐2*; 王 栋3; 潘佩珠1
1.中国公路工程咨询集团有限公司 空间信息应用与防灾减灾技术交通运输行业研发中心,北京 100097; 2.成都理工大学 地质灾害防治与地质环境保护国家重点实验室,成都 610059; 3.中铁二院工程集团有限责任公司,成都610031
Author(s):
ZHANG Yunling1; FU Yuhao1;  LI Weile2*; WANG Dong3; PAN Peizhu1
1. Research and Development Center of Transport Industry of Spatial Information Application and Disaster Prevention and Mitigation Technology, China Highway Engineering Consulting Corporation, Beijing 100097,China; 2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059,China; 3. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China
关键词:
雅西高速;  崩塌;  失稳机制;  切坡
Keywords:
Ya'an-Xicang Highway;  rockfall;  failure mechanism;  slope cutting
分类号:
O319.56
DOI:
10.16089/j.cnki.1008-2786.000610
文献标志码:
C
摘要:
近年来中国高速公路建设不断向西部高山峡谷区延伸,地质小灾害导致公路大灾害事件呈现多发趋势。2020年9月20日,四川省石棉县境内雅西高速姚河坝大桥右侧山体发生了体积约1×104 m3的崩塌,砸塌姚河坝大桥右幅两孔桥梁,造成全线交通中断,这是该高速公路运营以来最严重的地质灾害事件。通过多时相历史卫星影像、失稳后航空影像和选线阶段勘察资料的综合分析,初步揭示了该崩塌的基本特征和成灾机制:(1)该崩塌是典型的拉裂式花岗岩崩塌,高陡的临空面、中部凹腔和上部悬臂梁式突出岩体为崩塌孕育提供了有利的地形条件;(2)强风化花岗岩岩性、构造挤压导致岩体破碎,为崩塌的形成提供了有利的地质条件;(3)顺坡向、反坡向和斜切坡向的3组节理裂隙为崩塌的孕育提供了有利的坡体结构条件;(4)高速公路切坡进一步加剧了崩塌的变形;(5)前期降雨是此次崩塌失稳的直接诱发因素。此次崩塌虽然在高速公路选线阶段已经识别,但还是对高速公路造成了危害,主要原因为对崩塌体失稳规模估算偏小且未考虑后期工程开挖切坡的不利影响。残留体和潜在变形区对雅西高速存在较大风险,建议对残留体进行清除并对潜在变形进行工程治理和专业监测。
Abstract:
In recent years, highway construction continues to extend to alpine and gorge areas in western China, accompanied by minor geohazard occurrences taking placing along the highways with frequent and serious damages to the highways. On September 20, 2020, a collapse of about 1×104 m3 occurred at the crest of rock slope immediately close to the right side of the Yaoheba Bridge in the Shimian County section of the Ya'An-Xichang(Yaxi)Highway, Sichuan Province, China. This rockfall smashed two spans of bridge decks on the right side of the Yaoheba Bridge, causing traffic interruption across the entire line. This had been the most serious geological disaster event since the Highway was operated.Through comprehensive analysis of multi-temporal historical satellite images, post-event aerial images, and archived data retrieved from geological survey report at the stage of Highway survey and design, the formation characteristics and mechanism of the rockfall were preliminarily revealed:(1)The rockfall was a typical tensile-shearing collapse in granite. The steep free-facing rock surface, concave cavity in the middle and protruding rock mass in the upper in the shape of cantilever provided favorable topographic conditions for its prerequisite;(2)Strongly weathered and fragmented rockmass provided favorable geological conditions for the collapse;(3)The combination of three groups of discontinuity planes(in the dip direction, reverse to the dip direction and oblique to the dip direction, separately)provided favorable slope structure conditions for the collapse;(4)Slope-cutting at the feet of the rock slope as results of engineered activitiesy further aggravated the deformation of rock slope;(5)Precipitation was the direct triggering factor of the failure of the rock slope.Although this rockfall had been successfully identified earlier in the Highway route selection stage, it still did serious harm to the Highway. The main reason was that the instability scale of the rockfall was significantly underestimated, and the adverse effect of slope cutting due to later engineering excavation was not considered in design. Currently, residual body of rockmass and potential deformation areas is posing great threat to the safety of the Yaxi Highway. It is recommended to remove the residual body and the potential deformation area should be reinforced by engineering treatment. Besides, professional monitoring for potential deformation is quite needed.

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备注/Memo

备注/Memo:
收稿日期(Received date):2020-10-09; 改回日期(Accepted date):2021-06-11
基金项目(Foundation item):空间信息应用与防灾减灾技术交通运输行业研发中心开放基金(KF-2020-001); 国家自然科学基金(41941019, 41521002); 四川省地震科技创新团队专项(201901)。[Open Fund of Transportation Industry R & D Center for Spatial Information Application and Disaster Prevention and Mitigation Technology(KF-2020-001); National Natural Science Foundation of China(41941019, 41521002); Special Project of Sichuan Earthquake Science and Technology Innovation Team(201901)]
作者简介(Biography):张蕴灵(1984-),女,浙江绍兴人,高级工程师,主要研究方向:卫星遥感技术在交通运输行业中的应用。[ZHANG Yunling(1984-), female, born in Shaoxing, Zhejiang province, senior engineer, research on application of satellite remote sensing technology in transportation] E-mail:15901407461@163.com
*通讯作者(Corresponding author):李为乐(1982-),男,安徽太湖人,教授,主要研究方向:地质灾害早期识别与预测评价。[LI Weile(1982-), male, born in Taihu, Anhui province, Ph.D., professor, research on landslide early detection and prediction] E-mail:whylwl01@163.com
更新日期/Last Update: 2021-05-30