| 藏东察达高位崩塌发育特征及潜在危险 |
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| 引用本文： | 李元灵,刘建康,张佳佳,高波,田尤,熊德清.藏东察达高位崩塌发育特征及潜在危险[J].现代地质,2021,35(1):74-82. |
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| 作者姓名： | 李元灵 刘建康 张佳佳 高波 田尤 熊德清 |
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| 作者单位： | 1. 中国地质科学院 探矿工艺研究所,四川 成都 6117342. 中国地质调查局 地质灾害防治技术中心,四川 成都 6117343. 西华大学 应急学院,四川 成都 610039 |
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| 基金项目： | “第二次青藏高原综合科学考察研究”项目(2019QZKK0902);国家自然科学基金青年项目(41807300);中国地质调查局项目(DD20190644,20190505)。 |
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| 摘 要： | 高位崩塌具有运动速度快、运移距离远、冲击破坏力强等特征,对其下部工程设施及人民生命财产安全构成极大威胁。以藏东察达高位崩塌为研究对象,采用现场调查、遥感影像分析、无人机测绘及物探等工作手段,对其发育特征进行分析研究,探讨其潜在危害。研究结果表明,察达后山曾发生大型岩质崩塌,崩塌源区与前缘高差达1 340 m,最大水平距离超过2 600 m,估算其运动速度最大可达65.36 m/s,具有高速远程的运动特征。坡脚崩塌堆积体体积约160×10 4 m 3,表面巨石密布,堆积形态具有“颗粒反序”典型特征。现阶段崩塌源区仍发育有一定规模的危岩体,单体方量4.7×10 4 ~ 29×10 4 m 3。受断裂对冲挤压、冻融循环、长期卸荷或强震等因素影响,危岩体可能出现局部或整体失稳。一旦失稳,可能对坡脚构筑物和村庄构成威胁。建议采用综合手段进行深入勘查,分析其稳定性、失稳启动条件及发生概率,预测灾害体失稳后的影响范围,依据评价结果采取合理的措施进行防治。
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| 关 键 词： | 高位崩塌 高速远程移动 线路工程 防灾减灾 |
| 收稿时间： | 2020-10-09 |
| 修稿时间： | 2020-10-30 |
Characteristics and Potential Hazard of the Chada Collapse in Eastern Tibet |
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| LI Yuanling,LIU Jiankang,ZHANG Jiajia,GAO Bo,TIAN You,XIONG Deqing.Characteristics and Potential Hazard of the Chada Collapse in Eastern Tibet[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(1):74-82. |
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| Authors: | LI Yuanling LIU Jiankang ZHANG Jiajia GAO Bo TIAN You XIONG Deqing |
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| Institution: | 1. Institute of Exploration Technology, Chinese Academy of Geological Sciences, Chengdu, Sichuan 611734, China2. Technical Center for Geological Hazard Prevention and Control, Chinese Academy of Geological Sciences, Chengdu, Sichuan 611734, China3. School of Emergency Science, Xihua University, Chengdu, Sichuan 610039, China |
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| Abstract: | Featured by high speed,long transport and tremendous destruction,high-position collapses pose immense threats to the infrastructure,human lives and properties.The Chada high-position collapse was investigated in this study,and its development characteristics and potential hazards were analyzed through field investigation,remote sensing image analysis,unmanned aerial vehicle mapping and geophysical exploration.Our results show that the Chada high-position collapse involved a large rock volume 160×10~4 m~3 now located at the foot of the slope.The height difference of the collapse is 1,340 m.The maximum horizontal distance is over 2,600 m,and the maximum estimated speed is 65.36 m/s.This demonstrates that the collapse was of high-speed and long transport.The surface of the accumulation area is densely covered with boulders,and the accumulated rocks and soil display typical inverse grading feature.There are still 4.7×10~4-25×10~4 m~3 unstable rocks in the collapse source area.Induced by structural compression,freezing and thawing,long-term unloading and strong earthquake,the unstable rocks may fail and threaten the infrastructure and its ancillary facilities and villages.We suggested that geophysical exploration,costeaning and real-time monitoring should be conducted to assess the slope stability,initiating condition and probability of destabilization,and to predict and delineate the affected region.According to the evaluation results,appropriate measures should be conducted for hazard prevention. |
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| Keywords: | high-position collapse high-speed and long transport railway project disaster prevention and mitigation |
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