川藏铁路宋家沟泥石流发育特征及危险性分析

宋家沟为一条活跃的泥石流沟,该沟历史上曾爆发过较大规模泥石流灾害,对沟口新建川藏铁路升航大桥构成潜在威胁。通过区域资料收集、遥感解译技术、野外地质调查、室内实验分析与参数计算等综合手段,在研究泥石流的发育特征及形成条件的基础上,评价其危险性,针对泥石流对铁路工程的影响,给出防治建议。研究结果表明:宋家沟流域内泥石流的松散固体物质来源的类型主要包括坡面及冲沟物源、崩塌物源、工程弃渣物源和沟道物源;宋家沟泥石流活动处于发展期,泥石流的危险度属于中度危险,与实际调查结果一致。研究成果可为新建川藏铁路类似工程的防灾减灾提供借鉴。

Development Characteristics and Risk Assessment of Debris Flow in Songjia Gully along Sichuan-Tibet Railway

Songjia gully is an active debris flow gully. A large-scale debris flow disaster occurred in history, posing a potential threat to the newly built Shenghang bridge of Sichuan-Tibet Railway. The development characteristics and formation conditions of debris flow in Songjia Gully are analyzed, and the risk of debris flow in Songjia Gully is assessed based on comprehensive approaches inclusive of data collection, remote sensing interpretation, field investigation, indoor analysis and parameter calculation. Prevention and control measures targeted to the impact of debris flow on railway engineering are also proposed. The loose solid materials of debris flow in Songjia gully mainly come from slope surface erosion, collapses, engineering wastes, and the gully. Debris flow in Songjia Gully risk is in developing stage, moderately hazardous, consistent with survey results. The research findings offer reference for disaster prevention and mitigation of similar projects along the Sichuan-Tibet Railway.