循环荷载作用下掺土煤矸石力学性状试验研究
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摘要
为分析煤矸石中掺土作为高速公路路堤填料的可行性,通过掺土煤矸石的动三轴试验,对掺土煤矸石在循环荷载作用下的动力特性进行试验研究。研究结果表明:在煤矸石中掺入适当比例的黏土,其强度均有不同程度的提高,其中以煤矸石与土的干质量为3∶1～4∶1时效果较为明显;掺土煤矸石的动应力–应变骨干曲线可采用双曲线拟合,得出4种试验煤矸石样的等效非线性动力本构H-D模型参数。试验结果可用于分析煤矸石路堤在交通荷载作用下的稳定性及变形性状。采用掺土煤矸石作为路基填料,其力学性能完全满足高速公路的设计要求。
In order to analyze the technical feasibility of coal gangue mixed with soil as fillings of road embankment,the mechanical behaviors of coal gangue samples mixed with soil were studied by the consolidated undrained triaxial dynamic tests.For coal gangue with mixed soil samples,ratios of dry weight of coal gangue to that of soil are prepared with 4∶1,3∶1,and 2∶1,respectively.The results of dynamic strength tests indicate that dynamic stress σd of gangues mixed with soil increases with the proportion of soil;and there exists an optimum ratio between 3∶1 and 4∶1.The dynamic stress-strain curves can be fitted by hyperbolic curve;the dynamic hyperbolic model and its parameters are also obtained.The maximum dynamic modulus increases with the increase of confining pressure in the relation of exponential function through regression.All of these results can be used to analyze the stability of the coal gangue embankment under traffic load and its deformation.To further verify the results of indoor tests,an in-situ experiment was performed in actual road;and its ground deflections were determined.It is found that the strength of coal gangue mixed with soil as filling can meet the requirements of road embankment.
In order to analyze the technical feasibility of coal gangue mixed with soil as fillings of road embankment,the mechanical behaviors of coal gangue samples mixed with soil were studied by the consolidated undrained triaxial dynamic tests.For coal gangue with mixed soil samples,ratios of dry weight of coal gangue to that of soil are prepared with 4∶1,3∶1,and 2∶1,respectively.The results of dynamic strength tests indicate that dynamic stress σd of gangues mixed with soil increases with the proportion of soil;and there exists an optimum ratio between 3∶1 and 4∶1.The dynamic stress-strain curves can be fitted by hyperbolic curve;the dynamic hyperbolic model and its parameters are also obtained.The maximum dynamic modulus increases with the increase of confining pressure in the relation of exponential function through regression.All of these results can be used to analyze the stability of the coal gangue embankment under traffic load and its deformation.To further verify the results of indoor tests,an in-situ experiment was performed in actual road;and its ground deflections were determined.It is found that the strength of coal gangue mixed with soil as filling can meet the requirements of road embankment.
引文
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[17]谢定义.土动力学[M].西安:西安交通大学出版社,1998.(XIE Dingyi.Soil dynamic mechanic[M].Xi′an:Xi′an Jiaotong University Press,1988.(in Chinese))
[2]邱钰,缪林昌,刘松玉.煤矸石在道路建设中的应用研究现状及实例[J].公路交通科技,2002,19(2):1–5.(QIU Yu,MIAO Linchang,LIU Songyu.Application study and practice of coal gangue applied to road construction[J].Journal of Highway and Transportation Research and Development,2002,19(2):1–5.(in Chinese))
[3]刘松玉,童立元,邱钰,等.煤矸石在高速眼公路的应用研究[R].南京:东南大学交通学院,2006.(LIU Songyu,TONG Liyuan,QIU Yu,et al.Study on application of coal gangue used in road construction[R].Nanjing:College of Transportation,Southeast University,2006.(in Chinese))
[4]靳明,阳军生.高速公路煤矸石路基填筑技术研究[R].长沙:中南大学土木建筑学院,2006.(JIN Ming,YANG Junsheng.Experimental study on construction technology of coal gangue embankment[R].Changsha:School of Civil and Architectural Engineering,Central South University,2006.(in Chinese))
[5]MICHALSKI P,SKARZYNSKA K M.Compactability of coal mining wastes as a fill material[C]//Treatment and Utilization of Coal Mining Wastes.Durham,England:Symposium on the Reclamation,1984:283–288.
[6]SOLESBURY F W.Coal wastes in civil engineering works:two case histories from South Africa[C]//RAINBOW A K M,ed.The 2nd Symposium on the Reclamation,Treatment and Utilization of Coal Mining Wastes.[S.l.]:Printed in the Netherlands,1987:207–218.
[7]RAINBOW A K M,SKARZYNSKA K M.Minestone impoundment dams for fluid fly ash storage[C]//RAINBOW A K M,ed.The 2nd Symposium on the Reclamation,Treatment and Utilization of Coal Mining Wastes.[S.l.]:Printed in the Netherlands,1987:219–238.
[8]姜振泉,赵道辉,隋旺辉,等.煤矸石固结压密性与颗粒级配缺陷关系研究[J].中国矿业大学学报,1999,28(3):212–216.(JIANG Zhenquan,ZHAO Daohui,SUI Wanghui,et al.Study on relationship between consolidation compactness and size grade shortage of coal gangue[J].Journal of China University of Mining and Technology,1999,28(3):212–216.(in Chinese))
[9]姜振泉,于双忠,于震平.煤矸石的工程地质特征及在土木建筑中的利用[J].徐州:中国矿业大学学报,1992,21(增):77–82.(JIANG Zhenquan,YU Shuangzhong,YU Zhenping.The engineering geotechnical characteristics of coal wastes and its utilization in civil engineering[J].Xuzhou:Journal of China University of Mining and Technology,1992,21(Supp.):77–82.(in Chinese))
[10]姜振泉,季梁军,左如松.煤矸石的破碎压密作用机制研究[J].中国矿业大学学报,2001,30(2):139–142.(JIANG Zhenquan,JI Liangjun,ZUO Rusong.Research on mechanism of crushing-compression of coal waste[J].Journal of China University of Mining and Technology,2001,30(2):139–142.(in Chinese))
[11]李继祥,贺建清,张家生.石灰土填料在动载作用下弹性模量的试验研究[J].岩石力学与工程学报,2005,24(增1):4 715–4 720.(LI Jixiang,HE Jianqing,ZHANG Jiasheng.Experimental study on dynamic elastic modulus of lime soil filling under dynamic loading[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.1):4 715–4 720.(in Chinese))
[12]刘松玉,邱钰,童立元,等.煤矸石的动力特性试验研究[J].岩石力学与工程学报,2005,24(2):280–283.(LIU Songyu,QIU Yu,TONG Liyuan,et al.Experimental research on dynamic properties of coal mining waste[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(2):280–283.(in Chinese))
[13]余湘娟,房震,鲍东阳,等.煤矸石动强度特性试验研究[J].岩土力学,2005,26(增1):102–104.(YU Xiangjuan,FANG Zhen,BAO Dongyang,et al.Experiment study on dynamic strength of gangue[J].Rock and Soil Mechanics,2005,26(Supp.1):102–104.(in Chinese))
[14]彭社琴,赵其华,黄润秋.成都黏土动三轴试验研究[J].地质灾害与环境保护,2002,13(1):57–60.(PENG Sheqin,ZHAO Qihua,HUANG Runqiu.Dynamic triaxial study on Chengdu clay[J].Journal of Geological Hazards and Environment Preservation,2002,13(1):57–60.(in Chinese))
[15]沈金安.沥青及沥青混合料路用性能[M].北京:人民交通出版社,2001:458–466.(SHEN Jin′an.Road properties of bitumen and bituminous pavement[M].Beijing:China Communications Press,2001:458–466.(in Chinese))
[16]孙静.岩土动剪切模量阻尼试验及应用研究[博士学位论文][D].哈尔滨:中国地震局工程力学研究所,2004.(SUN Jing.Experiment and application studies on dynamic shear modulus and damping of geotechnical media[Ph.D.Thesis][D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2004.(in Chinese))
[17]谢定义.土动力学[M].西安:西安交通大学出版社,1998.(XIE Dingyi.Soil dynamic mechanic[M].Xi′an:Xi′an Jiaotong University Press,1988.(in Chinese))
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