完尕滩泥石流对新建兰合铁路的影响评价

通过对完尕滩泥石流流域的地质调绘、走访和资料搜集,查明泥石流流域内的地层岩性和松散堆积物数量、地形与沟床纵坡以及径流动力,明确泥石流的类型、规模。再运用流域环境条件量化权重标准,对泥石路沟的12个单因子定量或半定量评价,判定出泥石流沟的活动性和激发暴雨类型。计算出泥石流流体密度、流量和最大一次淤积量等相关参数。并对铁路在泥石流通过区的冲淤状态进行检算。最后结合新建兰合铁路与泥石流沟的相对空间关系,分析评价该泥石流沟对拟建兰合铁路的影响程度,并提出合理的工程措施建议。

The Influence Assessment of Wangatan Debris Flow on Lanzhou-Hezuo Newly-built Railway

On the basis of geological surveying, interviews and collected information in Wangatan catchment debris-flow basin,the stratum lithology,the amount of loose debris,the terrain,the gully longitudinal gradient and the runoff power are identified,and the debris flow type and scale are defined.Then based on the analysis of the twelve single factors quantification and semi quantification of debris flow,the activeness of debris flow and triggering heavy rainfall type are determined. The related parameters including debris flow fluid density,discharge and maximum one time accumulated sediments are calculated. And the erosion and sediment of the railway through the area with debris flow are calculated. Finally,with reference to relative spatial relationship between Lanzhou-Hezuo railway and debris flow,the influence of debris flow on Lanzhou-Hezuo newly-built railway is analyzed and rationale engineering measures and suggestions are presented.