小浪底库区垣曲段塌岸参数及其影响因素研究

Study on the Parameters of Bank Failure and the Influence Factors of Yuanqu Section in the Xiaolangdi Reservoir Area

小浪底库区黄土塌岸再造发育已危及沿岸居民区、工矿企业及公路的安全,若想对此类库岸的塌岸范围和规模做出准确的预测评价,预测塌岸参数是关键。通过大量调查,归纳总结出了横向类比和纵向类比两种预测塌岸参数取值的方法。同时在对小浪底库区垣曲段(沇河、亳清河、黄河)和二个类比水库(三门峡、官厅)典型塌岸的大量现场调查、参数实测的基础上,综合给出了垣曲段两种容易产生塌岸的岩土体塌岸关键参数水下堆积坡角θ、冲磨蚀坡角α、水上稳定坡角β特征值。调查结果表明,岩土体结构越松散、库水动力条件越强、粗粒径料含量越少,塌岸关键参数越小。

The reconstruction of loess bank caving in the Xiaolangdi Reservoir area is developed and endangers the littoral resident,workshop and highway along the river. Whether we can correctly forecast the bank collapse,the key is to forecast the parameters. Through a lot of investigation,the authors brought forward two methods for getting forecasting parameters,that is,longitudinal analogism and horizontal analogism. And based on a lot of investigation of Yuanqu section( Yanhe River,Boqing River and Yellow River) of the Xiaolangdi Reservoir area and other reservoirs( Sanmenxia and Guanting),this paper discussed the key forecasting parameters of the bank failure and its eigenvalue angles( θ,α and β) and did statistics of the parameters about two kinds of soils. After analyzing,some regularity conclusions have been drawn between soil components and the parameters,mechanics characteristics or reservoir water dynamical conditions. The looser the texture of soil is,the stronger dynamic force of reservoir water is,and the lower the percentage composition of the coarse grain is,the smaller the eigenvalue angle parameters is.