哈罗铁路沿线沉积物粒度特征

哈罗铁路开通对沿线资源的开发具有重要意义，然而自开通以来饱受风沙危害。对铁路沿线及防沙体系内沉积物粒度特征参数进行了对比分析，以期为该线风沙危害的科学防治提供有益参考。结果表明：（1）铁路沿线沉积物组成以中细沙为主，灌丛沙地分选性中等至很差，偏度以近对称为主，峰度中等至很窄；戈壁区沉积物整体分选性较差，偏度以极正偏为主，峰度以很窄为主；（2）灌丛沙地粒径频率曲线呈单峰态分布，而戈壁粒径频率曲线呈双峰或三峰态分布；哈密盆地区戈壁沉积物粒径垂直分布特征表现为上粗下细；（3）铁路沿线形成沙害的主要原因是就地起沙，防护体系内的积沙已成为危害铁路的二次沙源。

Grain size characteristics of sediment along the Hami-Lop Nor Railway

The operation of Hami-Lop Nor Railway is of great significance to the development of resources along the railway.However,it has suffered from sand hazards since its work.In this study,in order to provide useful references for the scientific control of the sand hazards of along the railway,the grain size characteristic parameters of sediment from along the railway and sand-prevention system were analyzed.The results showed that:(1)The sediment composition along the railway was mainly medium and fine sand.For the shrub sand,the sorting was medium to very poor,the skewness was mainly near symmetry,and the kurtosis was medium to very narrow.The sorting of the sediment from gobi area was poor,with pole-positive skewness predominating and very narrow kurtosis.(2)The grain size frequency curve of shrub sand presented the distribution with a single peak.However,the grain size frequency curve of the gobi area presented the distribution with bimodal or triple peaks.The vertical distribution of the particle size of the gobi sediment in the Hami Basin was characterized by coarse upper and finer bottom.(3)The main reason for the formation of sand hazards along the railway was local sand entrainment,and the sediment in the sand-prevention system has become the secondary source of sand hazards to the railway.