冻措曲冰湖溃决对铁路车站影响评价

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摘要 研究目的: 拟建某藏东南铁路洛隆车站位于冻措曲泥石流沟下游,上游源头处发育一较大冰湖,冰湖溃决对下游洛隆车站工程设置影响极大。本文通过多期遥感解译、现场调查、经验公式等方法分析计算冰湖全溃的流量、流速,评价冰湖溃决叠加百年一遇泥石流工况下路基和桥梁方案的安全性。
研究结论: (1) 经对比分析,Costa J E经验公式更加适用冰湖溃决流量的计算;(2)冻措曲主沟为轻度易发泥石流沟,并处于衰退～停歇期;支沟易发性为轻度易发～中度易发,具备暴发泥石流灾害的可能性,潜在危害大,冻措曲冰湖堰塞湖风险等级为Ⅰ级;(3)极端工况条件下采用桥梁方案过流能力优于路基方案,推荐洛隆车站采用桥梁方案;(4)建议加强洛隆车站监测预警及沿河道侧防冲刷措施以确保工程安全;(5)本研究结果对洛隆车站工程设置有一定指导意义,也可为铁路合理选线提供科学依据。

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	李俊青

关键词 ：冰湖泥石流, 溃决, 过流能力

Abstract：Research purposes: Luolong Station is a railway station in Southeast Tibet, located in the downstream of Dongcuoqu, where a glacial lake debris flow trench is developed at the upstream source. The glacial lake outburst has a great impact on the Luolong Station. In this paper, the flow rate and flow velocity of the glacier lake collapse are calculated through multi-phase remote sensing interpretation, on-site investigation, and empirical formula. The safety of subgrade and bridge schemes under superimposed rainfall conditions in a hundred years is evaluated.
Research conclusions: (1) After comparative analysis, the Costa J E empirical formula is more suitable for the calculation of glacial lake outburst flow. (2) The main ditch of Dongcuoqu is mildly prone to debris flow, and is in the recession-stop period; The susceptibility of branch ditch is mild to moderate, and there is the possibility of a debris flow disaster, and the potential harm is great. The risk level of Dongcuoqu glacial lake dammed lake is Class I. (3) Comparing flow capacity of the subgrade and bridge in the extremely cases, the bridge shechme is recommended. (4) In order to ensure the project safety, strengthening the monitoring and early-warn at Luolong Station as well as anti-scour measures along the river are suggested. (5) The research results have guiding significance for Luolong Station, and it also provides a scientific basis for route selection in railway.

Key words： glacial lake debris flow outburst flow capacity

收稿日期: 2021-12-06

PACS:

U212.22

基金资助:科技部国家重点研发计划——强震区特大泥石流防控标准化体系及示范应用(2018YFC1505406)

作者简介: **李俊青,1982年出生,男,高级工程师。

引用本文:

李俊青. 冻措曲冰湖溃决对铁路车站影响评价[J]. 铁道工程学报, 2022, 39(4): 31-37.
LI Junqing. Evaluation on the Influence of Dongcuoqu Glacial Lake Outburst on Railway Station Engineering. Journal of Railway Engineering Society, 2022, 39(4): 31-37.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I4/31

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