论文部分内容阅读
地基系数K30及变形模量Ev2是我国铁路设计规范中用以控制路基不同结构层现场填筑压实质量的重要力学指标。我国幅员辽阔,各地填料土质多变,许多地方合格填料缺乏,在以往的工程实践中,填料填筑于路基上经分层碾压之后,地基系数K30和变形模量Ev2现场检测不能满足标准要求,需要换填合格填料或进行土质改良,给现场施工带来很大麻烦和不必要的经济损失。为了解决上述问题,通过波速试验建立路基质量现场控制指标K30及Ev2的室内预估方法,对路基现场填料选取具有指导意义,避免了填料选取的盲目性,同时对改良土的的配合比设计也具有重要作用。
The foundation coefficient K30 and the deformation modulus Ev2 are important mechanical indexes for controlling the compaction quality of the different structural layers of subgrade in China’s railway design code. In our country, there is a vast territory with variable soil contents in many places, and the lack of qualified packing in many places. In the past engineering practice, after the filling was filled in the subgrade and layered and compacted, the on-site inspection of foundation coefficient K30 and deformation modulus Ev2 can not meet the standard requirements , Need to fill in the qualified packing or soil improvement, bring great trouble to the on-site construction and unnecessary economic losses. In order to solve the above problems, the indoor prediction method of subgrade quality field control index K30 and Ev2 is established by wave speed test, which is instructive for the selection of subgrade fill in the roadbed and avoids the blindness of filler selection. Meanwhile, the mix design of modified subgrade Has an important role.