不同地区原状黄土动剪切模量与阻尼比试验研究
|
摘要
黄土在我国具有明显的区域分布特征,从空间平面上把握其动力特性参数的分布规律具有一定的现实意义。以不同含水率与不同应力状态下兰州、洛川、杨凌地区原状黄土为研究对象,进行动扭剪三轴试验,测定了黄土的动剪切模量与阻尼比的变化规律。结果表明,兰州、洛川、杨凌地区原状黄土的动剪切模量随动剪应变的增加而逐渐减小,且减小的幅度越来越小;含水率与固结应力对兰州、洛川、杨凌地区原状黄土的动剪切模量与初始动剪切模量影响显著;在相同含水率和固结应力下,兰州、洛川、杨凌地区原状黄土的初始动剪切模量在地理空间分布上具有一定的规律性,兰州地区黄土最小,洛川地区黄土次之,杨凌地区黄土最大,即从西北向东南方向增大;兰州、洛川、杨凌地区原状黄土的阻尼比总体上随动剪应变的增大呈现上升趋势,且三个地区原状黄土的阻尼比随动剪应变的增长速率也存在区域性差异,兰州地区黄土最大,洛川地区黄土次之,杨凌地区黄土最小,即从西北向东南方向减小。
In China,loess has obvious regional distribution characteristics,and there is a certain practical significance to grasp the distribution laws of its dynamic characteristic parameters from the space plane.The dynamic torsional shear triaxial tests are carried out on undisturbed loess of Lanzhou,Luochuan and Yangling under different moisture contents and different stress states,and the variation laws of dynamic shear modulus and damping ratio of loess are obtained.The results show that the dynamic shear modulus of Lanzhou,Luochuan and Yangling loess decrease gradually with the increase of dynamic shear strain,and the decrease rate becomes smaller and smaller.The moisture content and consolidation stress have significant influences on the dynamic shear modulus and the initial dynamic shear modulus.Under the same moisture content and consolidation stress,the initial dynamic shear modulus of Lanzhou,Luochuan and Yangling loess conform to the law of increment from the northwest to the southeast in the geographical spatial distribution,the dynamic shear modulus of Lanzhou loess is the smallest,the following is that of Luochuan loess,and that of Yangling loess is the largest.As a whole,the damping ratios of Lanzhou,Luochuan and Yangling loess increase with the increase of dynamic shear strain.The increase rate of the damping ratios in the three regions conform to the law of decrement from the northwest to the southeast,the damping ratio of Lanzhou loess is the largest,the following is that of Luochuan loess,and that of Yangling loess is the smallest.
In China,loess has obvious regional distribution characteristics,and there is a certain practical significance to grasp the distribution laws of its dynamic characteristic parameters from the space plane.The dynamic torsional shear triaxial tests are carried out on undisturbed loess of Lanzhou,Luochuan and Yangling under different moisture contents and different stress states,and the variation laws of dynamic shear modulus and damping ratio of loess are obtained.The results show that the dynamic shear modulus of Lanzhou,Luochuan and Yangling loess decrease gradually with the increase of dynamic shear strain,and the decrease rate becomes smaller and smaller.The moisture content and consolidation stress have significant influences on the dynamic shear modulus and the initial dynamic shear modulus.Under the same moisture content and consolidation stress,the initial dynamic shear modulus of Lanzhou,Luochuan and Yangling loess conform to the law of increment from the northwest to the southeast in the geographical spatial distribution,the dynamic shear modulus of Lanzhou loess is the smallest,the following is that of Luochuan loess,and that of Yangling loess is the largest.As a whole,the damping ratios of Lanzhou,Luochuan and Yangling loess increase with the increase of dynamic shear strain.The increase rate of the damping ratios in the three regions conform to the law of decrement from the northwest to the southeast,the damping ratio of Lanzhou loess is the largest,the following is that of Luochuan loess,and that of Yangling loess is the smallest.
引文
[1]王兰民,石玉成,刘旭,等.黄土动力学[M].北京:地震出版社,2003.(WANG Lan-min,SHI Yu-cheng,LIU Xu,et al.Loess dynamics[M].Beijing:Earthquake Press,2003.(in Chinese))
[2]张振中.黄土地震灾害预测[M].北京:地震出版社,1999.(ZHANG Zhen-zhong.Prediction of seismic hazard of loess[M].Beijing:Earthquake Press,1999.(in Chinese))
[3]李启鹞,程显尧,蔡东艳.地震荷载下的黄土动力特性[J].西安冶金建筑学院学报,1985(3):9–37.(LI Qi-yao,CHENG Xian-yao,CAI Dong-yan.Dynamic characteristics of loess under seismic load[J].Journal of Xi’an Institute of Metallurgy and Construction Engineering,1985(3):9–37.(in Chinese))
[4]巫志辉,谢定义,余雄飞.洛川黄土动变形强度特性的研究[J].水利学报,1994(12):67–71.(WU Zhi-hui,XIE Ding-yi,YU Xiong-fei.Study on dynamic deformation and density characteristics of Luochuan loess[J].Journal of Hydraulic Engineering,1994(12):67–71.(in Chinese))
[5]田堪良,张慧莉,张伯平,等.动扭剪荷载作用下非饱和黄土动力特性试验研究[J].岩石力学与工程学报,2004,23(24):4151–4155.(TIAN Kan-liang,ZHANG Hui-li,ZHANG Bo-ping,et al.An experimental study on dynamic properties of unsaturated loess under dynamic torsional shear[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(24):4151–4155.(in Chinese))
[6]骆亚生,田堪良.非饱和黄土的动剪模量与阻尼比[J].水利学报,2005,36(7):830–834.(LUO Ya-sheng,TIAN Kan-liang.Dynamic shear modulus and damping ratio of unsaturated loess[J].Journal of Hydraulic Engineering,2005,36(7):830–834.(in Chinese))
[7]陈存礼,杨鹏,何军芳.饱和击实黄土的动力特性研究[J].岩土力学,2007,28(8):1551–1556.(CHEN Cun-li,YANG Peng,HE Jun-fang.Research on dynamic characteristics of saturated compacted loess[J].Rock and Soil Mechanics,2007,28(8):1551–1556.(in Chinese))
[8]谷天峰,王家鼎,任权,等.循环荷载作用下黄土边坡变形研究[J].岩石力学与工程学报,2009,28(增刊1):3156–3162.(GU Tian-feng,WANG Jia-ding,REN Quan,et al.Study on deformation of loess slope under cyclic load[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(S1):3156–3162.(in Chinese))
[9]HARDIN B O,DRNEVICH V P.Shear modulus and damping in soils:measurement and parameter effects[J].Journal of Soil Mechanics and Foundation Division,ASCE,1972,98(6):603–624.
[10]陈国兴,刘雪珠,朱定华,等.南京新近沉积土动剪切模量比与阻尼比的试验研究[J].岩土工程学报,2006,28(8):1023–1027.(CHEN Guo-xing,LIU Xue-zhu,ZHU Ding-hua,et al.Experimental studies on dynamic shear modulus ratio and damping ratio of recently deposited soils in Nanjing[J].Chinese Journal of Geotechnical Engineering,2006,28(8):1023–1027.(in Chinese))
[11]齐剑峰,栾茂田,杨庆,等.饱和黏土动剪切模量与阻尼比的试验研究[J].岩土工程学报,2008,30(4):518–523.(QI Jian-feng,LUAN Mao-tian,YANG Qing,et al.Dynamic shear modulus and damping ratio of saturated clay[J].Chinese Journal of Geotechnical Engineering,2008,30(4):518–523.(in Chinese))
[12]HARDIN B O,DRNEVICH V P.Shear modulus and damping in soils:design equation and curves[J].Journal of Soil Mechanics and Foundation Division,ASCE,1972,98(7):667–692.
[13]刘东生,等.黄土的物质成分和结构[M].北京:科学出版社,1966.(LIU Dong-sheng,et al.The material composition and structure of loess[M].Beijing:Science Press,1966.(in Chinese))
[14]骆亚生.中国典型黄土动力特性及其参数的试验分析[D].西安:西安理工大学,2000.(LUO Ya-sheng.Test analysis of dynamic characteristic and parameter of some typical loess in China[D].Xi'an:Xi'an University of Technology,2000.(in Chinese))
[15]谢定义.土动力学[M].西安:西安交通大学出版社,1988.(XIE Ding-yi.Soil dynamics[M].Xi'an:Xi'an Jiaotong University Press,1988.(in Chinese))
[2]张振中.黄土地震灾害预测[M].北京:地震出版社,1999.(ZHANG Zhen-zhong.Prediction of seismic hazard of loess[M].Beijing:Earthquake Press,1999.(in Chinese))
[3]李启鹞,程显尧,蔡东艳.地震荷载下的黄土动力特性[J].西安冶金建筑学院学报,1985(3):9–37.(LI Qi-yao,CHENG Xian-yao,CAI Dong-yan.Dynamic characteristics of loess under seismic load[J].Journal of Xi’an Institute of Metallurgy and Construction Engineering,1985(3):9–37.(in Chinese))
[4]巫志辉,谢定义,余雄飞.洛川黄土动变形强度特性的研究[J].水利学报,1994(12):67–71.(WU Zhi-hui,XIE Ding-yi,YU Xiong-fei.Study on dynamic deformation and density characteristics of Luochuan loess[J].Journal of Hydraulic Engineering,1994(12):67–71.(in Chinese))
[5]田堪良,张慧莉,张伯平,等.动扭剪荷载作用下非饱和黄土动力特性试验研究[J].岩石力学与工程学报,2004,23(24):4151–4155.(TIAN Kan-liang,ZHANG Hui-li,ZHANG Bo-ping,et al.An experimental study on dynamic properties of unsaturated loess under dynamic torsional shear[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(24):4151–4155.(in Chinese))
[6]骆亚生,田堪良.非饱和黄土的动剪模量与阻尼比[J].水利学报,2005,36(7):830–834.(LUO Ya-sheng,TIAN Kan-liang.Dynamic shear modulus and damping ratio of unsaturated loess[J].Journal of Hydraulic Engineering,2005,36(7):830–834.(in Chinese))
[7]陈存礼,杨鹏,何军芳.饱和击实黄土的动力特性研究[J].岩土力学,2007,28(8):1551–1556.(CHEN Cun-li,YANG Peng,HE Jun-fang.Research on dynamic characteristics of saturated compacted loess[J].Rock and Soil Mechanics,2007,28(8):1551–1556.(in Chinese))
[8]谷天峰,王家鼎,任权,等.循环荷载作用下黄土边坡变形研究[J].岩石力学与工程学报,2009,28(增刊1):3156–3162.(GU Tian-feng,WANG Jia-ding,REN Quan,et al.Study on deformation of loess slope under cyclic load[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(S1):3156–3162.(in Chinese))
[9]HARDIN B O,DRNEVICH V P.Shear modulus and damping in soils:measurement and parameter effects[J].Journal of Soil Mechanics and Foundation Division,ASCE,1972,98(6):603–624.
[10]陈国兴,刘雪珠,朱定华,等.南京新近沉积土动剪切模量比与阻尼比的试验研究[J].岩土工程学报,2006,28(8):1023–1027.(CHEN Guo-xing,LIU Xue-zhu,ZHU Ding-hua,et al.Experimental studies on dynamic shear modulus ratio and damping ratio of recently deposited soils in Nanjing[J].Chinese Journal of Geotechnical Engineering,2006,28(8):1023–1027.(in Chinese))
[11]齐剑峰,栾茂田,杨庆,等.饱和黏土动剪切模量与阻尼比的试验研究[J].岩土工程学报,2008,30(4):518–523.(QI Jian-feng,LUAN Mao-tian,YANG Qing,et al.Dynamic shear modulus and damping ratio of saturated clay[J].Chinese Journal of Geotechnical Engineering,2008,30(4):518–523.(in Chinese))
[12]HARDIN B O,DRNEVICH V P.Shear modulus and damping in soils:design equation and curves[J].Journal of Soil Mechanics and Foundation Division,ASCE,1972,98(7):667–692.
[13]刘东生,等.黄土的物质成分和结构[M].北京:科学出版社,1966.(LIU Dong-sheng,et al.The material composition and structure of loess[M].Beijing:Science Press,1966.(in Chinese))
[14]骆亚生.中国典型黄土动力特性及其参数的试验分析[D].西安:西安理工大学,2000.(LUO Ya-sheng.Test analysis of dynamic characteristic and parameter of some typical loess in China[D].Xi'an:Xi'an University of Technology,2000.(in Chinese))
[15]谢定义.土动力学[M].西安:西安交通大学出版社,1988.(XIE Ding-yi.Soil dynamics[M].Xi'an:Xi'an Jiaotong University Press,1988.(in Chinese))
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心