风化软岩路堤填筑与填料改良试验研究

摘要

针对南钦铁路沿线风化软岩填料(C组)进行现场路堤填筑试验,对强风化粉砂岩、粉砂质泥岩填料进行水泥改良土试验,并对两种填筑方案进行投资分析.结果表明:南钦铁路沿线强风化软质岩细粒土不满足速度目标值250 km/h路堤填料要求；强风化粉砂岩、粉砂质泥岩填料掺4％水泥改良后,能满足南钦铁路路堤本体填料的要求,比远运合格填料方案更为合理.%The embankment filling tests were carried out in connection in weathered soft rock filler (Group C) along Nanning-Qinzhou Railway, wherein cement-improved soil tests in connection to strongly weathered siltstone and silty mudstone fillers. Based on the test results, investment analysis of two filling schemes was performed. The result shows that the fine grained soil of strongly weathered soft rock along Nanning-Qinzhou Railway do not meet the requirement of 250 km/h about embankment filler. However, the strongly weathered siltstone and silty mudstone filler improved by incorporation of 4 % cement could reach the filling requirement therein and is more reasonable than the use of qualified filler transported elsewhere.