铁路基床表层掺拌法改良砂砾石填料级配研究

Study on Improving Graded Sand Gravel Filling Using Blending Method for Surface Layer of Railway Subgrade Bed

委内瑞拉北部平原迪—阿铁路工程,需用大量的级配砂砾作为路基基床表层的填料,而级配砂砾石作为铁路基床表层填料,对细粒土含量有严格的要求。针对天然砂砾石级配的缺陷,研究了掺拌法改良级配的计算方法。采用该方法,成功解决了天然砂砾石混合料的级配缺陷,目前己在其铁路工程中推广应用,取得了较好的经济效益和社会效益。

A plenty of graded gravel is required for Di-A Railway Project in north plain of Venezuela as the filling of surface layer of subgrade bed, and as the filling of surface layer of subgrade bed, the graded sand gravel has strict requirement for fine-grained soil. According to the defects of natural sand gravel gradation, the calculation method is studied for the gradation improvement in the blending method. The gradation defect of the natural sand gravel mixture is successfully solved by this method. At present, better economic benefit and social benefit will be obtained during its use in the railway projects.