路用碱渣土力学性质及机理研究  

Research on Mechanical Properties and Mechanism of Soda Residue Soil for Road

作　　者：邵剑涛 蒋耳龙 杨天风 赵晓晴 岳志才 陈琦 李家伟 张长杰 SHAO Jian-tao;JIANG Er-long;YANG Tian-feng;ZHAO Xiao-qing;YUE Zhi-cai;CHEN Qi;LI Jia-wei;ZHANG Chang-jie(No.Three Engineering Co.Ltd.of CCCC First Highway Engineering Co.Ltd,Beijing 1011021,China;School of Civil and Ocean Engineering,Jiangsu Ocean University,Lianyungang 222005,China;Jiangsu Ocean Engineering Research Center for Intelligent Infrastructure Construction,Liangyungang 222005,China;Jiangsu Provincial Marine Resources Development Institute,Lianyungang 222005,China;School of Transportation,Southeast University,Nanjing 210096,China;Railway Development Center of Lianyungang City,Liangyungang 222005,China)

机构地区：[1]中交一公局第三工程有限公司,北京市101102 [2]江苏海洋大学,连云港市222005 [3]江苏省海洋工程基础设施智能建造工程研究中心,连云港市222005 [4]江苏省海洋资源开发研究院,连云港市222005 [5]东南大学交通学院岩土工程研究所,南京市210096 [6]连云港市铁路事业发展中心,连云港市222005

出　　处：《公路》2024年第5期365-371,共7页Highway

基　　金：国家自然科学基金项目,项目编号51809101;江苏省重点研发计划,项目编号BE2021681;江苏高校青蓝工程资助性项目,项目编号KK22022;江苏省高等学校自然科学研究项目,项目编号23KJA580003;连云港市重点研发计划,项目编号SF2230;连宿高速公路产学研项目,项目编号JOUH22089。

摘　　要：为了拓宽路基填料来源、资源化利用碱渣,采用碱渣改性高液限黏土,制备路基填料。引入传统石灰土改性黏土填料,通过对比两类改性土的击实性质、承载比(CBR)、7 d无侧限抗压强度(UCS),评价碱渣对高液限黏土的改性效果。结果表明:碱渣土的最大干密度随着碱渣掺量的增大而减小,最佳含水率则反之;碱渣掺量达到30%时,碱渣土的CBR和UCS值最优;碱渣土的击实性质与石灰土相当,碱渣掺量30%的碱渣土CBR、UCS均满足相关规范要求,分别可达到9%石灰掺量石灰土的57%、64%;碱渣改性黏土的强度机理主要来源于碱渣与黏土的颗粒互补作用和碱渣的类石灰性质,碱渣与黏土的化学反应与石灰类似;碱渣能够有效提高黏土的力学性质,改性效果明显。To widen the source of subgrade filler and recycle soda residue,high liquid limit clay is modified by soda residue,preparing subgrade filler called soda residue soil.Lime is used to modify clay filler.By comparing their compaction properties,California Bearing Ratio(CBR)and 7dunconfined compression strength(UCS)of the two types of soils,the modification effect of soda residue modifying high liquid limit clay is evaluated.The results show that the maximum dry density of soda residue soil decreases with the increase of soda residue content,and the optimum water content is vice versa.When the soda residue content reaches 30%,the CBR and UCS values of soda residue soil are highest.The compaction property of soda residue soil is similar to that of lime soil.The CBR and UCS of soda residue soil with 30%soda residue content can meet the requirements of relevant specifications,respectively reaching 57%and 64%of lime soil with 9%lime content.The strength mechanism of soda residue soil is mainly derived from the complementary effect of soda residue and clay particles,and the chemical reaction between soda residue and clay.The chemical reaction between soda residue and clay as lime is similar.Soda residue is lime-like,but it also has its own characteristics,that cause soda residue to effectively improve the mechanical properties of clay.

关 键 词：碱渣土 石灰土 击实性质 CBR UCS 力学机理 

分 类 号：U414.03[交通运输工程—道路与铁道工程] TU472.5[建筑科学—结构工程]