西昌昔格达组黏土岩动力特性试验研究
|
摘要
在大量动三轴试验的基础上,研究了不同固结条件(σ3c=100,200,400 kPa,kc=1.0,1.5,2.0)下西昌昔格达组黏土岩的动应力-动应变关系、动弹性模量、阻尼比及动强度特性。研究结果表明:西昌昔格达组黏土岩在一定条件下的动应力-动应变关系符合幂函数模型。动应力随着固结围压σ3c或固结主压力比kc增大而增大。在相同围压下,达到相同动应变时,偏压固结状态比均压状态所需要的动应力大。当其他条件相同时,动弹性模量随固结压力或固结主压力比增大而增大,随着动应变的增加而减小并趋于稳定。最大动弹性模量Ed0与σ3c/Pa、kc均有良好的幂函数关系,且对不同固结应力状态条件可以归一。阻尼比随动应变增大而增大,但增大幅度随动应变增大而迅速减小,阻尼比随围压或固结主压力比增大而减小,但它们对阻尼比影响较小。不同固结应力状态下(λ/λmax)与(1-Ed/Ed0)有良好的幂函数关系。西昌昔格达组饱和黏土岩动剪应力τd随固结围压σ3c或固结主压力比kc增大而增大,随振动次数增加而减小。τd/σm均随固结围压σ3c增大而减小,随固结压力比kc增大而增大。动剪应力τd与平均压力σm、固结主压力比kc有较好的线性关系。
Based on a lot of dynamic triaxial tests,some dynamic characteristics,such as the relation between dynamic stress and strain,dynamic elastic modulus,damping ratio and dynamic strength are studied for Xigeda formation claystone in Xichang city under different consolidation stress conditions(σ3c=100、200、400 kPa,kc=1.0、1.5、2.0).It is indicated from test results that: the relation between dynamic stress and strain can be fitted with power function model under certain conditions.Dynamic stress increases with the increase of confining pressure σ3c or consolidation stress ratios kc.The Xigeda formation claystone in Xichan city produces larger strain under anisotropic consolidation stress condition than that under isotropic consolidation stress condition at the same stress condition.Dynamic modulus increases with the increase of confining pressure or consolidation stress ratios;it decreases with the increase of dynamic strain and tends to stability under certain condition.Power correlations between the maximum dynamic elastic modulus Ed0 and σ3c/Pa,kc are obtained and normalized under different consolidation stress conditions.Damping ratio increases with the increase of dynamic strain,but the variety gets smaller with the increase of dynamic strain;the damping ration decreases with the increase of confining pressure or consolidation stress ratios,but it is almost independent of them.Power correlations between(λ/λmax)and(1-Ed/Ed0) are obtained under different consolidation stress conditions.Dynamic shear stress τd increases with the increase of confining pressure σ3c or consolidation stress ratios kc,but it decreases with the increase of vibration number.τd/σm decreases with the increase of confining pressure σ3c,but it increases with the increase of consolidation pressure ratio kc.Dynamic shear stress τd has significant linear relation with mean pressure σm and consolidation stress ratios kc.
Based on a lot of dynamic triaxial tests,some dynamic characteristics,such as the relation between dynamic stress and strain,dynamic elastic modulus,damping ratio and dynamic strength are studied for Xigeda formation claystone in Xichang city under different consolidation stress conditions(σ3c=100、200、400 kPa,kc=1.0、1.5、2.0).It is indicated from test results that: the relation between dynamic stress and strain can be fitted with power function model under certain conditions.Dynamic stress increases with the increase of confining pressure σ3c or consolidation stress ratios kc.The Xigeda formation claystone in Xichan city produces larger strain under anisotropic consolidation stress condition than that under isotropic consolidation stress condition at the same stress condition.Dynamic modulus increases with the increase of confining pressure or consolidation stress ratios;it decreases with the increase of dynamic strain and tends to stability under certain condition.Power correlations between the maximum dynamic elastic modulus Ed0 and σ3c/Pa,kc are obtained and normalized under different consolidation stress conditions.Damping ratio increases with the increase of dynamic strain,but the variety gets smaller with the increase of dynamic strain;the damping ration decreases with the increase of confining pressure or consolidation stress ratios,but it is almost independent of them.Power correlations between(λ/λmax)and(1-Ed/Ed0) are obtained under different consolidation stress conditions.Dynamic shear stress τd increases with the increase of confining pressure σ3c or consolidation stress ratios kc,but it decreases with the increase of vibration number.τd/σm decreases with the increase of confining pressure σ3c,but it increases with the increase of consolidation pressure ratio kc.Dynamic shear stress τd has significant linear relation with mean pressure σm and consolidation stress ratios kc.
引文
[1]易桂喜,闻学泽,苏有锦.川滇活动地块东边界强震危险性研究[J].地球物理学报,2008,51(6):1719-1725.YI Guixi,WEN Xueze,SU Youjin.Study on the potential strong earthquake risk for the eastern bounday of the Sichuan-Yunnan active faulted-block,China[J].Chinese Journal of Geophysics,2008,51(6):1719-1725.(in Chinese)
[2]韩渭宾,蒋国芳.大凉山断裂带与安宁河-则木河断裂带的地震活动性分析[J].地震研究,2005,28(3):207-212.HAN Weibin,JIANG Guofang.Study on seismicity of Daliangshan and Anninghe-Zemuhe ault zones[J].Jouranl of Seisological Research,2005,28(3):207-212.(in Chinese)
[3]孙静,袁晓铭.土的动模量和阻尼比研究综述[J].世界地震工程,2003,19(1):88-95.SUN Jing,YUAN Xiaoming.A state-of-art of research dynamic modulus and damping ratio of soils[J].World Earthquake Engineering,2003,19(1):88-95.(in Chinese)
[4]王炳辉,陈国兴,王晶华.宁波近海沉积土动力特性的试验研究[J].自然灾害学报,2007,16(4):55-60.WANG Binghui,CHENG Guoxing,WANG Jinghuia.Experimental study on dynamic characteristics of Ningbo’s offshore sediment soils[J].Jour-nal of Natural Disaters,2007,16(4):55-60.(in Chinese)
[5]刘惠军,聂德新.昔格达地层研究综述[J].地球科学进展,2004,19(增刊):80-82.LIU Huijun,NIE Dexin.The overview of the Xigeda strata’s study[J].Advance in Earth Sciences,2004,19(Supp 1):80-82.(in Chinese)
[6]李又云,谢永利,刘保健.路基击实黄土动力特性的试验研究[J].岩石力学与工程学报,2009,28(5):1037-1046.LI Youyun,XIE Yongli,LIU Baojian.Experimental research on dynamic characteristics of roadbed compaction loess[J].Chinese Journal of RockMechanics and Engineering,2009,28(5):1037-1046.(in Chinese)
[7]CHEN Guoxing,LIU Xuezhu.Experimental study on dynamic shear modulus and damping ratio of recently deposited soils in Nanjing and itsneighboring areas[J].Journal of Disaster Prevention and Mitigation Engineering,2004,24(2):168-176.
[8]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程与工程振动,1995,15(1):73-84.CHEN Guoxing,XIE Junfen,ZHANG Kexu.The empirical evaluation of soil moduli and damping ratio for dynamic analysis[J].Journal of Earth-quake Engineering and Engineering Vibration,1995,15(1)73-84.(in Chinese)
[9]赵淑萍,朱元林,何平,等.冻土动力学参数测试研究[J].岩石力学与工程学报,2003,22(增2):2667-2681.ZHAO Shuping,ZHU Yuanlin,HE Ping,et al.Testing study on dynamic mechanics parameters of frozen soil[J].Chinese Jouranl of Rock Mechan-ics and Engineering,2003,22(supp 2):2667-2681.(in Chinese)
[10]尚可平,刘方成,杜运兴,等.应变积累对黏土动剪切模量和阻尼比的试验研究[J].岩土力学,2006,27(5):683-688.SHANG Keping,LIU Fangcheng,DU Yunxing.et al.Experimental study on effect of shear strain accumulation on dynamic shear modulus anddamping ratio of clay soil[J].Rock and Soil Mechanics,2006,27(5):683-688.(in Chinese)
[11]柴华友,崔玉军,卢应发.循环荷载下黄土特性模拟[J].岩石力学与工程学报,2005,24(23):4272-4281.CHAI Huayou,CUI Yujun,LU Yingfa.Simulation of loess behaviours under cyclic loading[J].Chinese Journal of Rock Mechanics and Engineer-ing,2005,24(23):4272-4281.(in Chinese)
[2]韩渭宾,蒋国芳.大凉山断裂带与安宁河-则木河断裂带的地震活动性分析[J].地震研究,2005,28(3):207-212.HAN Weibin,JIANG Guofang.Study on seismicity of Daliangshan and Anninghe-Zemuhe ault zones[J].Jouranl of Seisological Research,2005,28(3):207-212.(in Chinese)
[3]孙静,袁晓铭.土的动模量和阻尼比研究综述[J].世界地震工程,2003,19(1):88-95.SUN Jing,YUAN Xiaoming.A state-of-art of research dynamic modulus and damping ratio of soils[J].World Earthquake Engineering,2003,19(1):88-95.(in Chinese)
[4]王炳辉,陈国兴,王晶华.宁波近海沉积土动力特性的试验研究[J].自然灾害学报,2007,16(4):55-60.WANG Binghui,CHENG Guoxing,WANG Jinghuia.Experimental study on dynamic characteristics of Ningbo’s offshore sediment soils[J].Jour-nal of Natural Disaters,2007,16(4):55-60.(in Chinese)
[5]刘惠军,聂德新.昔格达地层研究综述[J].地球科学进展,2004,19(增刊):80-82.LIU Huijun,NIE Dexin.The overview of the Xigeda strata’s study[J].Advance in Earth Sciences,2004,19(Supp 1):80-82.(in Chinese)
[6]李又云,谢永利,刘保健.路基击实黄土动力特性的试验研究[J].岩石力学与工程学报,2009,28(5):1037-1046.LI Youyun,XIE Yongli,LIU Baojian.Experimental research on dynamic characteristics of roadbed compaction loess[J].Chinese Journal of RockMechanics and Engineering,2009,28(5):1037-1046.(in Chinese)
[7]CHEN Guoxing,LIU Xuezhu.Experimental study on dynamic shear modulus and damping ratio of recently deposited soils in Nanjing and itsneighboring areas[J].Journal of Disaster Prevention and Mitigation Engineering,2004,24(2):168-176.
[8]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程与工程振动,1995,15(1):73-84.CHEN Guoxing,XIE Junfen,ZHANG Kexu.The empirical evaluation of soil moduli and damping ratio for dynamic analysis[J].Journal of Earth-quake Engineering and Engineering Vibration,1995,15(1)73-84.(in Chinese)
[9]赵淑萍,朱元林,何平,等.冻土动力学参数测试研究[J].岩石力学与工程学报,2003,22(增2):2667-2681.ZHAO Shuping,ZHU Yuanlin,HE Ping,et al.Testing study on dynamic mechanics parameters of frozen soil[J].Chinese Jouranl of Rock Mechan-ics and Engineering,2003,22(supp 2):2667-2681.(in Chinese)
[10]尚可平,刘方成,杜运兴,等.应变积累对黏土动剪切模量和阻尼比的试验研究[J].岩土力学,2006,27(5):683-688.SHANG Keping,LIU Fangcheng,DU Yunxing.et al.Experimental study on effect of shear strain accumulation on dynamic shear modulus anddamping ratio of clay soil[J].Rock and Soil Mechanics,2006,27(5):683-688.(in Chinese)
[11]柴华友,崔玉军,卢应发.循环荷载下黄土特性模拟[J].岩石力学与工程学报,2005,24(23):4272-4281.CHAI Huayou,CUI Yujun,LU Yingfa.Simulation of loess behaviours under cyclic loading[J].Chinese Journal of Rock Mechanics and Engineer-ing,2005,24(23):4272-4281.(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