不同地区黄土动强度变化规律试验研究
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摘要
利用动扭剪仪,研究了不同地区(兰州、洛川、杨凌、巩义)黄土的动强度特性以及变形特性。重点研究了不同地区黄土在不同含水率,不同固结应力和振次下的动强度特性及其相互差异。研究表明:各地区黄土动强度特性由强到弱依次是杨凌、巩义、洛川、兰州,总趋势上呈现出由西北向东南逐渐增强的态势;含水率及固结应力对试样强度均影响明显;各地区黄土受含水率影响存在明显差异,随强度的增强对含水率的敏感性增强;非饱和黄土和饱和黄土在强度及变形特性存在明显差异;由四个地区的原状黄土的τdf/σ3与破坏振次N的关系曲线,得出这些地区黄土τdf/σ3~N均没有归一性,但随着含水率的增大归一性趋势逐渐增强。
Some aspects such as the behaviors of dynamic strength and dynamic deformation of the loess in different regions(Lanzhou,Luochuan,Gongyi,Yangling),were studied with the dynamic torsional shear test.The study is focused on the dynamic strength characteristics of the loess under different water content,different consolidation stress and different vibration times in different regions.The research showed that: The dynamic strength characteristics of the loess in different regions from strong to weak were Yangling,Gongyi,Luochuan and Lanzhou ones,the main trend tended rising from the northwest to the southeast.Water content and consolidation stress had significant influence on the dynamic strength of the loess;There were significant differences between the loess in different regions affected by the water content,with the enhance mnet of the strength,the sensitivity of water content is enhanced,too.There were significant differences between the strength and deformation characteristics of unsaturated loess and saturated loess.The relation curves between τdf/σ3 and damage vibration times N of the loess in different regions showed that the τdf/σ3 had no normalized relation,but with the enhancement of water content,it tended to be enhanced.
Some aspects such as the behaviors of dynamic strength and dynamic deformation of the loess in different regions(Lanzhou,Luochuan,Gongyi,Yangling),were studied with the dynamic torsional shear test.The study is focused on the dynamic strength characteristics of the loess under different water content,different consolidation stress and different vibration times in different regions.The research showed that: The dynamic strength characteristics of the loess in different regions from strong to weak were Yangling,Gongyi,Luochuan and Lanzhou ones,the main trend tended rising from the northwest to the southeast.Water content and consolidation stress had significant influence on the dynamic strength of the loess;There were significant differences between the loess in different regions affected by the water content,with the enhance mnet of the strength,the sensitivity of water content is enhanced,too.There were significant differences between the strength and deformation characteristics of unsaturated loess and saturated loess.The relation curves between τdf/σ3 and damage vibration times N of the loess in different regions showed that the τdf/σ3 had no normalized relation,but with the enhancement of water content,it tended to be enhanced.
引文
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[2]王杰贤.动力地基与基础[M].北京:科学出版社,2001.(WANG Jie-xian.Dynamic foundation andground[M].BeiJin:Science Press,2001.5.(in Chi-nese))
[3]王兰民,张振中,王峻,等.随机地震荷载作用下黄土动强度的试验方法[J].西北地震学报,1991,13(3):50-55.(WANG Lan-min,ZHANG Zhen-zhong,WANG Jun,et al.Experimental study on dynamic con-stitutive relationship of loess under random seismic load-ing[J].Northwestern Seismological Journal,1991,13(3):50-55.(in Chinese))
[4]田堪良.黄土的结构性及其动力特性的研究[D].杨凌:西北农林科技大学,2003.(TIAN Kan-liang.Studyon structure characteristics and dynamic behavior of lo-ess[D].Yangling:Northwest Sci-tech University ofAgriculture and Forestry,2003.(in Chinese))
[5]骆亚生,谢定义.黄土破坏动应力和初始动模量的一种经验估算公式[J].西北水资源与水工程,2000,11(3):6-10.(LUO Ya-sheng,XIE Ding-yi.An empir-ical formula On estimating loess dynamic failure stressand primary dynamic modulus[J].Water Resource Wa-ter Engineering,2000,11(3):6-10.(in Chinese))
[6]王兰民,袁中夏,王峻,等.强夯处理后黄土地基的动力特性与地震性能[J].岩石力学与工程学,2003,22(增2):2 840-2 847.(WANG Lan-min,YUANZhong-xia,WANG Jun,et al.Dynamic characteristicsand seismic resistance of loess ground treated with dy-namic compaction[J].Chinese Journal of Rock Me-chanics and Engineering,2003,22(Supp.2):2 840-2 847.(in Chinese))
[7]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):4 151-4 155.(TIAN Kan-liang,ZHANG Hui-li,ZHANG Bo-ping,et al.An experimen-tal study on dynamic properties of unsaturated loess un-der dynamic torsional shear[J].Chinese Journal ofRock Mechanics and Engineering,2004,23(24):4 151-4 155.(in Chinese))
[8]李作勤.扭转三轴试验综述[J].岩土力学,1994,15(1):80-93(LI Zuo-qin.The summarize of dynamictorsional triaxial compression test[J].Rock and SoilMechanics,1994,15(1):80-93.(in Chinese))
[9]徐张建,林在贯,张茂省.中国黄土与黄土滑坡[J].岩石力学与工程学报,2007,26(7):1 297-1 312.(XU Zhang-jian,LIN Zai-guan,ZHANG Mao-sheng.Loess in China and loess landside[J].Chinese Journalof Rock Mechanics and Engineering,2007,26(7):1297-1312.(in Chinese))
[10]王兰民等.黄土动力学[M].2003.10.(WANG Lan-min,et al.Loess dynamics[M].2003.10.(in Chi-nese))
[11]骆亚生,田堪良.非饱和黄土动力特性试验方法研究[J].地下空间与工程学报,2007,3(6):1042-1045.(LUO Ya-sheng,TIAN Kan-liang.Research onMethod of Dynamic Characteristics Tests for Unsaturat-ed Loess[J].Chinese Journal of Underground Spaceand Engineering,2007,3(6):1042-1045.(in Chi-nese))
[12]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 anddamping ratio of unsaturated loess[J].Journal of Hy-draulic Engineering,2005,36(7):830-834.(inChinese))
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