某铁路拟选车站泥石流危险性分析及防治对策
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摘要
西南地区铁路受地形地貌的限制,部分车站站址无法避免地需布设于泥石流洪积扇上。因此,对泥石流的风险评估是方案能否成立的重点。文章以某铁路拟选的毛家沟车站为例,通过野外调查、资料收集、数据分析,从地形地貌、物源条件、气候特征三方面分析了该沟泥石流产生的条件。同时,通过室内颗分试验得到了细小颗粒含量、颗分曲线,与蒋家沟泥石流进行类比分析,明确了其稀性泥石流的性质。最后,通过数值模拟,模拟了200年一遇洪水频率条件下的泥石流泥深,评价了其危险等级,为中度危险级别。该研究成果为铁路的方案选择、站场布置,灾害防治设计提供了依据。
The railways in southwest China are restricted by the topography,some stations have no choice but to be set at the Proluvial fan of debris flow,which makes the risk analysis become the key point for the whole plan. This Paper choose Maojiagou station as an example,through field investigation,data collection and data analysis,the conditions of debris flow in the gully are analyzed from three aspects: topography and landform,material source conditions and climatic characteristics. At the same time,defined the character of diluted debris flow through the laboratory size distribution testing and analogy analysis with Jiangjiagou Debris. Finally,Throughthe numerical simulation technology,debris flow and mud depth under the condition of flood frequency in 200 years were simulated,and the risk level was evaluated as moderate risk level. This research result provided the basis for the railway program selection,station layout,disaster prevention and control.
The railways in southwest China are restricted by the topography,some stations have no choice but to be set at the Proluvial fan of debris flow,which makes the risk analysis become the key point for the whole plan. This Paper choose Maojiagou station as an example,through field investigation,data collection and data analysis,the conditions of debris flow in the gully are analyzed from three aspects: topography and landform,material source conditions and climatic characteristics. At the same time,defined the character of diluted debris flow through the laboratory size distribution testing and analogy analysis with Jiangjiagou Debris. Finally,Throughthe numerical simulation technology,debris flow and mud depth under the condition of flood frequency in 200 years were simulated,and the risk level was evaluated as moderate risk level. This research result provided the basis for the railway program selection,station layout,disaster prevention and control.
引文
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