客运专线水泥改良黄土路基填料填筑试验研究
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摘要
根据郑西客运专线黄土填料水泥改良室内试验结果,选取6%水泥改良黄土路基填料进行现场填筑压实工艺及检测试验研究。通过水泥改良黄土时效性试验,确定以3 h对应的最大干密度作为最终压实检测指标;采用不同压实工艺对不同厚度改良黄土填料进行压实试验,得出选定水泥改良黄土路基填料松铺系数为1.1~1.2,松铺厚度为20~30 cm,最优含水率为12%,最佳的碾压方式为静压1遍、弱振1~2遍、继续静压2~3遍。路基沉降长期观测及工后沉降预测结果表明,在满足压实系数0.95的条件下,水泥改良黄土路基本体的平均沉降率为0.24‰,满足铺设无砟轨道路基的设计要求。
Combined with the indoor tests on cement improved loess as the filling material for the subgrade construction of ZhengzhouXi'an passenger dedicated line,a field test applying 6% cement improved loess as the filling material in mix ratio has been conducted to study the construction techniques and the testing method on filling and compaction.Through time dependent test of cement improved loess,the maximum dry density at three hours can be used as the index for final compaction testing.Compaction tests have been carried out on cement improved loess as the filling material with different thickness by applying different compaction methods.It is deduced from the test that the loose paving coefficient of the selected cement improved loess as the filling material of subgrade is 1.1～1.2;the loose paving thickness is 20～30 cm;the optimum moisture content is 12%;the optimum grinding and compaction method is 1 static compaction,then 1～2 weak shake,and finally 2～3 static compaction.Results of the long term observation of subgrade settlement and the forecast of after the post-construction settlement indicate that the average sedimentation rate of cement improved loess for subgrade body is 0.24‰ under the condition of satisfying the compaction coefficient 0.95,which meets the design demand for laying the subgrade of ballastless track.
Combined with the indoor tests on cement improved loess as the filling material for the subgrade construction of ZhengzhouXi'an passenger dedicated line,a field test applying 6% cement improved loess as the filling material in mix ratio has been conducted to study the construction techniques and the testing method on filling and compaction.Through time dependent test of cement improved loess,the maximum dry density at three hours can be used as the index for final compaction testing.Compaction tests have been carried out on cement improved loess as the filling material with different thickness by applying different compaction methods.It is deduced from the test that the loose paving coefficient of the selected cement improved loess as the filling material of subgrade is 1.1～1.2;the loose paving thickness is 20～30 cm;the optimum moisture content is 12%;the optimum grinding and compaction method is 1 static compaction,then 1～2 weak shake,and finally 2～3 static compaction.Results of the long term observation of subgrade settlement and the forecast of after the post-construction settlement indicate that the average sedimentation rate of cement improved loess for subgrade body is 0.24‰ under the condition of satisfying the compaction coefficient 0.95,which meets the design demand for laying the subgrade of ballastless track.
引文
[1]房立凤,蒋关鲁,张俊兵,等.郑西客运专线路基黄土填料水泥改良试验研究[J].铁道标准设计,2008(9):4-6.(FANG Lifeng,JIANG Guanlu,ZHANG Junbing,et al.Experimental Research on Improvement of Loess FillingMaterial Concrete for Subgrade of Zhengzhou-Xi’an Passenger Dedicated Line[J].Railway Standard Design,2008(9):4-6.in Chinese).
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[2]铁道第一勘察设计院.TB10102—2004/J338—2004铁路工程土工试验规程[S].北京:中国铁道出版社,2004.(China Railway First Survey and Design Institute.TB10102—2004/J338—2004 Code for Soil Test of Railway Engi-neering[S].Beijing:China Railway Publishing House,2004.in Chinese)
[3]中铁二局集团有限公司.TB10202—2002/J161—2002铁路路基施工规范[S].北京:中国铁道出版社,2002.(China Railway No.2 Engineering Group Co Ltd.TB10102—2002/J161—2002 Code for Construction on Subgradeof Railway[S].Beijing:China Railway Publishing House,2002.in Chinese)
[4]铁道第三勘察设计院.新建时速200~250公里客运专线铁路设计暂行规定(铁建设[2005]140号)[Z].北京:中国铁道出版社,2005.
[5]王兰民.黄土动力学[M].北京:地震出版社,2003.
[6]WATANABE K,TATEYAMA M,JIANG G L,et al.Strength and Deformation Characteristics of Cement-MixedGravel Evaluated by Large-Scale Triaxial Tests[C]//Proc.of 3rd Int.Symposium on Prefailure DeformationCharacteristics of Geomaterials,Lyon:Balkema,2003,1:683-693.
[7]日本鉄道総合技術研究所.鉄道構造物等設計標準?同解説省力軌道土構造物[S].东京:丸善株式会社出版,平成11年.
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