232:2023年5月工程技术与应用江西建材降雨条件下水泥改良强风化千枚岩路基填土适用性数值分析刘建中铁十六局集团路桥工程有限公司,北京101520摘要:为研究水泥改良前后强风化千枚岩作为路基填土在降雨及荷载作用下的适用性,文中利用Geostudio有限元软件,对未改良及改良后路基土的无侧限抗压强度最优组合方案进行数值模拟分析,模拟路基经过降雨后的渗流、和车辆荷载与降雨同时作用后的变形,获得了改良前后千枚岩路基的渗流特征及沉降变形差异性。研究结果表明,改良后的强风化千枚岩作为路基填料时,在不同工况下较未改良千枚岩抗渗性能好、路基变形小。关键词:千枚岩;Geostudio;水泥改良;路基填土中图分类号:U416.1文献标识码:B文章编号:1006-2890(2023)05-0232-03NumericalAnalysisofApplicabilityofCement-modifiedStronglyWeatheredPhylliteSubgradeFillUnderRainfallConditionsLiuJianChinaRailway16thBureauGroupRoadandBridgeEngineeringCo.Ltd.,Beijing101520Abstract:Inordertostudytheapplicabilityofstronglyweatheredphylliteassubgradefillbeforeandaftercementimprovementundertheactionofrainfallandload,thispaperusesGeostudiofiniteelementsoftwaretocarryoutnumericalsimulationoftheoptimalhorizontalcombinationofunconfinedcompressivestrengthoftheunmodifiedandimprovedsubgradesoil,simulatingtheseepageofthesubgradeafterrainfall,andthedeformationofthesubgradeafterthesimultaneousactionofvehicleloadandrainfall.Thedifferenceofseepagecharacteristicsandsettlementdeformationofphyllitesubgradebeforeandafterimprovementisobtained.Theresultsshowthattheimprovedstronglyweatheredphylliteassubgradefillerhasbetterimpermeabilityandlesssubgradedeformationthantheunmodifiedphylliteunderdifferentconditions.Keywords:Phyllite;Geostudio;Cementimprovement;Subgradefilling0引言风化千枚岩是一种较典型的软岩弃料,岩体抗风化能力弱,强度及水理性质较差,遇水、风化后其抗压强度会急剧降低,难以应用在道路工程建设中[1],但经水泥改良后其强度和水稳定性均有较大提高。南昌属典型多雨地区,千枚岩风化程度高,强风化千枚岩在雨水的不断渗透下易发生软化[2],引发道路沉降,导致路面出现裂缝、弯沉等不良现象,造成多种道路病害,不利于道路长期使用。20世纪80年代,M.D.Gidigasu【3]研...