级配对煤矸石路基填料压实与强度特性的影响试验研究  

EXPERIMENTAL STUDY OF GRADATION EFFECT ON COMPACTION AND STRENGTH CHARACTERISTICS OF COAL GANGUE SUBGRADE FILLER

作　　者：张宗堂[1,2] 高文华[1,2] 刘昌平 刘泽[1,2] 冯锡祥 ZHANG Zongtang;GAO Wenhua;LIU Changping;LIU Ze;FENG Xixiang(Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Gansu Jingyuan Coal Industry and Electricity Power Co.,Ltd.,Pingchuan 730913,China)

机构地区：[1]湖南科技大学,岩土工程稳定控制与健康监测湖南省重点实验室,中国湘潭411201 [2]湖南科技大学,土木工程学院,中国湘潭411201 [3]甘肃靖远煤电股份有限公司,中国平川730913

出　　处：《工程地质学报》2023年第5期1774-1781,共8页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:52208341);湖南省自然科学基金项目(资助号:2020JJ4019,2023JJ40293);湖南省科技人才托举工程项目——“小荷”科技人才项目(资助号:2023TJ-X74);浙江省交通科技项目(资助号:2020004).

摘　　要：为研究级配对煤矸石路基填料压实与强度特性的影响,以湖南湘潭某废弃煤矿的煤矸石为研究对象,通过大型振动压实试验与大型三轴试验研究了煤矸石路基填料压实与强度特性的级配效应。基于分形模型级配方程,求解得到了良好级配的取值界限,并分析了采用该级配方程进行级配设计的优越性。级配对煤矸石路基填料的压实与强度均存在较大影响。随着细颗粒含量的增加,最大干密度与偏应力均先增大后减小,反映出煤矸石路基填料的颗粒级配存在最优区间。在此基础上,获取了煤矸石路基填料的最优级配区间。试验结果表明,通过大型三轴试验与振动压实试验获取的煤矸石路基填料最优级配区间基本一致,考虑到大型三轴试验成本较高,可通过振动击实试验直接获取其最优级配。This paper aims to study the effect of gradation on the compaction and strength characteristics of coal gangue subgrade filler.It takes the coal gangue collected from an abandoned coal mine in Xiangtan of Hunan Province as the research object.It studies the gradation effect of the compaction and strength behaviors for coal gangue subgrade filler using large vibration compaction experiment and large-scale triaxial test.Based on the gradation equation of fractal model,the limit of well gradation is captured,and the advantages of using this gradation equation for designing gradation are analyzed.Moreover,the gradation has great influence on the compaction and strength of coal gangue subgrade filler.With the increase of fine particle content,the maximum dry density and deviatoric stress first increase and then decrease,which reflects the existence of an optimal range of particle gradation for coal gangue subgrade filler.On this basis,the optimal gradation ranges of coal gangue subgrade filler is obtained.In addition,the test results show that the optimal gradation ranges of coal gangue subgrade filler obtained by large-scale triaxial test and vibration compaction experiment are basically the same.Considering the high cost of large-scale triaxial test,the vibration compaction is recomended to obtain the experiment optional gradation.

关 键 词：煤矸石路基 级配 压实 强度 最大干密度 

分 类 号：TU45[建筑科学—岩土工程]