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1.中国科学院、水利部成都山地灾害与环境研究所,四川 成都 610041
2.中国科学院大学,北京100049
Received:15 August 2020,
Revised:2020-11-09,
Published:16 June 2021
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姚杰,李秀珍,徐瑞池.降雨条件下拟建川藏铁路典型段潜在滑坡三维稳定性动态识别研究[J].防灾减灾工程学报,2021,41(03):422-431.
YAO Jie,LI Xiuzhen,XU Ruichi.Dynamic Identification of Three‑dimensional Stability of Potential Landslides in a Typical Section of the Proposed Sichuan‑Tibet Railway under Rainfall Conditions[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(03):422-431.
姚杰,李秀珍,徐瑞池.降雨条件下拟建川藏铁路典型段潜在滑坡三维稳定性动态识别研究[J].防灾减灾工程学报,2021,41(03):422-431. DOI: 10.13409/j.cnki.jdpme.202008015.
YAO Jie,LI Xiuzhen,XU Ruichi.Dynamic Identification of Three‑dimensional Stability of Potential Landslides in a Typical Section of the Proposed Sichuan‑Tibet Railway under Rainfall Conditions[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(03):422-431. DOI: 10.13409/j.cnki.jdpme.202008015.
拟建川藏铁路是国家中长期规划网中的重要一线,具有重大的国防和经济意义。铁路横穿青藏高原东缘地形急变带,沿线发育崩塌、滑坡等众多山地灾害。以川藏铁路比选线邦达机场至然乌段作为主要研究区段,在对该段已有滑坡灾害进行野外调查和遥感解译的基础上,将降雨入渗斜坡稳定性分析模型(TRIGRS)中的降雨入渗模块和三维斜坡稳定性分析模型(Scoops3D)有机结合起来,对川藏铁路典型段的潜在滑坡进行系统的三维搜索及识别,分析天然状态下潜在滑坡的分布范围和50年一遇极端降雨情景下研究区段斜坡稳定性的动态变化。研究结果表明:(1)在天然状态下,高风险潜在滑坡主要集中分布于拟建怒江大桥附近,低风险潜在滑坡主要分布于冷曲河两岸陡峻斜坡和拟建怒江大桥附近;(2)在50年一遇极端降雨情景下,潜在滑坡区的分布范围较天然状态下均显著增大,高风险和低风险潜在滑坡在拟建怒江大桥附近和沿冷曲河两岸陡峻斜坡均有密集分布;(3)极端降雨情景下模型计算的潜在滑坡分布结果与历史滑坡灾害的分布特征基本是一致的。
The proposed Sichuan-Tibet railway is an important line in the national medium and long-term planning network, which has great national defense and economic significance. The railway passes through the abrupt terrain belt on the eastern edge of the Qinghai-Tibet Plateau, and there are many mountain hazards such as rockfalls and landslides along the line. In this paper, the section from Bangda airport to Ranwu of Sichuan-Tibet railway comparison line is taken as the main study section. Based on the field investigations and remote sensing interpretations of the existing landslide hazards in this section, the rainfall infiltration module in the rainfall infiltration slope stability analysis model (TRIGRS) and the three-dimensional slope stability analysis model (Scoops3D) are combined organically to perform a systematic three-dimensional search and identification of potential landslides in the typical section of Sichuan-Tibet railway. Moreover, the distribution range of potential landslides in the natural state and the dynamic change of slope stability in the study section under the 50-year extreme rainfall scenario are analyzed. The research results show that:(a) under natural conditions, potential high-risk landslides are mainly distributed near the proposed Nujiang River Bridge, and potential low-risk landslides are mainly distributed near the steep slopes on both sides of the Lengqu River and the proposed Nujiang River Bridge; (b) under the 50-year extreme rainfall scenario, the distribution range of potential landslide areas is significantly larger than that in the natural state, potential high-risk and low-risk landslides are densely distributed near the proposed Nujiang River Bridge and along the steep slopes of both banks of the Lengqu River; (c) the distribution of potential landslides calculated by the model under the extreme rainfall scenario is basically consistent with the distribution characteristics of historical landslide disasters.
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