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工程科学与技术:2022,54(2):30-40
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川藏铁路雅安至昌都段高陡危岩发育特征与快速评价
(1.中铁二院工程集团有限责任公司, 四川 成都 610031;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, 四川 成都 610059)
Development Characteristics and Rapid Evaluation of High-steep Unstable Rock in Ya’an-Changdu Section of Sichuan-Tibet Railway
(1.China Railway Eryuan Eng. Group Co. Ltd., Chengdu 610031, China;2.State Key Lab. of Geohazard Prevention and Geoenvironment Protection, Chengdu Univ. of Technol., Chengdu 610059, China)
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投稿时间:2021-06-16    修订日期:2021-11-30
中文摘要: 川藏铁路处于四川盆地向青藏高原过渡的地形跨越带,沿线活动构造、河谷卸荷及冻融风化等区域特色地质因素对危岩发育和稳定性具有较强的控制作用。开展沿线危岩落石调查及稳定性快速评价方法研究对早期阶段的铁路选线具有重要意义。基于遥感和无人机影像解译,结合地质调查验证,总结了川藏铁路雅安至昌都段隧道进出口危岩发育特征;考虑区域地质环境特点,提出高海拔危岩的致灾模式及快速评价方法。调查结果表明:1)该段隧道进出口共发育危岩141处,以小中型(<1 000 m3)为主,大渡河、雅砻江及金沙江等深切卸荷峡谷区发育最为密集;2)海拔3 000 m以上区域受冻融风化的三叠系砂板岩段危岩较多且稳定性较差;3)高地震烈度区域和活动断裂附近危岩发育相对集中;沿线危岩致灾模式表现为以卸荷为变形基础,持续冻融损伤和间歇性地震活动等因素相互耦合的特点。本文考虑了3个川藏铁路特色地质因素(冻融、卸荷和地震烈度),提取了5个危岩稳定性基本因素(地形坡度、岩体风化程度、凹腔、主控结构面及岩石类型)等8个指标;引入可拓学理论,将稳定性分为4级,判别各指标的权重和关联度,并进行综合评价,建立了高寒山区危岩稳定性快速评价方法;最后,运用该方法分别对7处危岩实例进行评价,其稳定性评价结果和主控因素与现场情况较符合,能满足川藏铁路高寒山区危岩稳定性的快速判别。
Abstract:Sichuan-Tibet railway is in the topographic crossing zone from the Sichuan basin to Qinghai Tibet Plateau. Regional characteristic geological factors such as active structure, valley unloading and freeze-thaw weathering along the line have strong control over the development and stability of unstable rocks. It is of great significance for railway route selection in the early stage to carry out the investigation of unstable rocks and the research on the rapid evaluation method of stability. Based on the interpretation of remote sensing and unmanned aerial vehicle images with verification of field investigation, the development characteristics of unstable rock at the entrance and exit of tunnels along the Sichuan-Tibet railway from Ya’an to Changdu were summarized, and the failure mode and rapid evaluation method of stability at high altitude were put forward considering the regional geological characteristics. The results show that: 1) There were 141 unstable rocks developed in the small and medium size (<1 000 m3). The deep canyon areas such as Dadu River, Yalong River and Jinsha River were the most densely developed. 2) The unstable rock was mainly developed in the freeze-thaw weathered Triassic sand-slate interbedded phyllite section above 3 000 m, accompanying with low stability; 3) The distribution of unstable rock was also related to the high seismic intensity area and active fault. The failure mode of unstable rock in this region showed that multiple indexes were coupled with each other, including the unloading behavior of ground stress, persist damage of freeze-thaw, and intermittent seismicity. Eight indexes were extracted, including special geological indexes of the Sichuan-Tibet area, the freeze-thaw, unloading behavior and seismic intensity, and five basic indexes of stability evaluation of unstable rock, terrain gradient, weathering intensity of rock mass, cavity, main control structural plane and lithology. The stability evaluation model of unstable rock in the cold region was established based on extension theory through comprehensively estimating the weight and relevancy of each index for the four stability levels. Analysis results of seven cases suggested that the stability estimation and controlling indexes were in accord with the field situation by using this method, which could quickly identify the stability of unstable rock in the alpine mountainous area of the Sichuan-Tibet railway.
文章编号:202100561     中图分类号:    文献标志码:
基金项目:国家自然科学基金项目(41972284;41521002);中铁二院工程集团有限责任公司科研项目(KYY2020010)
作者简介:第一作者:张广泽(1965-),男,教授级高级工程师.研究方向:工程地质.E-mail:252897727@qq.com;通信作者:陈国庆,E-mail:chgq1982@126.com
引用文本:
张广泽,陈国庆,王哲威,王栋,裴本灿.川藏铁路雅安至昌都段高陡危岩发育特征与快速评价[J].工程科学与技术,2022,54(2):30-40.
ZHANG Guangze,CHEN Guoqing,WANG Zhewei,WANG Dong,PEI Bencan.Development Characteristics and Rapid Evaluation of High-steep Unstable Rock in Ya’an-Changdu Section of Sichuan-Tibet Railway[J].Advanced Engineering Sciences,2022,54(2):30-40.