重载铁路路基软质岩填料及改良土工程性质试验研究  

Experimental Study on Engineering Properties of Soft Rock Filler and Modified Soil for Heavy-haul Railway Subgrade

作　　者：方东 罗强[1,2] 朱江江[1,2] 薛猛[1,2] FANG Dong;LUO Qiang;ZHU Jiangjiang;XUE Meng(Key Laboratory of High-speed Railway Engineering,of Ministry of Education,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]高速铁路线路工程教育部重点实验室,成都610031 [2]西南交通大学土木工程学院,成都610031

出　　处：《路基工程》2018年第6期127-131,共5页Subgrade Engineering

摘　　要：以蒙华重载铁路岳阳至吉安段软质岩填料为研究对象,通过一系列室内试验,对其作为重载铁路基床以下路堤填料的工程性质进行了研究。结果表明:软质岩的矿物成分主要为石英,含有较多次生矿物,使其具有一定黏聚性,全风化软质岩属于D组填料;增加软质岩填料的压实度或进行水泥改良能有效提高其抗剪强度和抗渗透能力,并降低压缩性;对软质岩进行3. 0%的水泥改良或4. 5%的石灰改良后,其无侧限抗压强度能够满足规范对于重载铁路基床以下路堤的强度要求。The soft rock filler used in Yueyang-Ji an Section of Menghua Heavy Haul Railway was taken as the object,and through a series of laboratory tests,its engineering properties as the filler under the foundation bed of heavy haul railway,was studied.The result shows that,the soft rock,which has the main mineral composition to be quartz and contains a variety of secondary minerals,is of certain cohesiveness,wherein the completely weathered soft rock is included into the Group D packing;as the filler,its increased compaction degree or cement modification may increase the shear strength and anti-permeability thereof,simultaneously,decrease the compressibility;after modified by 3.0%cement or by 4.5%lime,the soft rock has the unconfined compressive strength meeting the requirement in the standard for subgrade under foundation bed of heavy haul railway.

关 键 词：重载铁路 软质岩填料 改良土 工程性质 

分 类 号：U214.11[交通运输工程—道路与铁道工程]