西昌昔格达组粉砂岩动力特性研究
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摘要
为西昌昔格达组地层场地地震安全性评价提供基础性数据,对西昌经久乡昔格达组粉砂岩进行了一系列动三轴试验。研究结果表明:西昌昔格达组粉砂岩在一定条件下(σ3c=100、200、400kPa,kc=1.0、1.5、2.0)的骨干曲线符合幂函数模型;动剪应力随着固结围压σ3c或固结主压力比kc增大而增大;在偏压状态下产生相同动剪应变所需要的动剪应力比均压状态所需要的动剪应力大。不同固结应力条件下,动剪切模量随固结压力或固结主压力比增大而增大,随动剪应变增加而减小并趋于稳定;最大动剪切模量Gd0与σ3c/Pa、kc均有良好的幂函数关系。阻尼比随动剪应变增大而增大,但增大幅值随动剪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;不同固结应力条件下(λ/λmax)与(1-Gd/Gd0)有良好的幂函数关系并可归一化处理。西昌昔格达组饱和粉砂岩的动剪应力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随固结围压σ3c增大而减小,随固结主压力比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。
In order to provide basic data for seismic safety evaluation of Xigeda formation site in Xichang city,a series of dynamic triaxial tests were conducted for Xigeda formation siltstone at Jingjiu site.Experimental results indicate that under certain conditions(σ3c=100,200,400 kPa,kc=1.0,1.5,2.0),the relation between dynamic shear stress and dynamic shear strain accords with power function model.Dynamic shear stress increases with the increase of confining pressure σ3c or consolidation principal pressure ratio kc;under condition of anisotropic consolidation stress,Xigeda formation siltstone in Xichang city produces larger dynamic shear strain than that obtained under condition of isotropic consolidation stress.Under condition of different consolidation stresses,dynamic shear modulus increases with the increase of confining pressure or consolidation principal pressure ratio,and decreases with the increase of dynamic shear strain and stabilizes.Power function correlations among maximum dynamic shear modulus Gd0 and σ3c/Pa、kc are obtained,respectively.Damping ratio increases with the increase of dynamic shear strain,but the amplitude of increase becomes smaller rapidly;it decreases with the increase of confining pressure or consolidation principal pressure ratio;Power function correlations between(λ/λmax)and(1-Gd/Gd0) are obtained and normalized under condition of different consolidation stresses.Dynamic shear stress τd increases with the increase of confining pressure σ3c or consolidation principal pressure ratio kc,but decreases with the increase of vibration number.The ratio τd/σm decreases with the increase of confining pressure σ3c,but increases with the increase of consolidation principal pressure kc;dynamic shear stress τd has linear relations with the mean pressure σm and the consolidation principal pressure ratio kc,respectively.
In order to provide basic data for seismic safety evaluation of Xigeda formation site in Xichang city,a series of dynamic triaxial tests were conducted for Xigeda formation siltstone at Jingjiu site.Experimental results indicate that under certain conditions(σ3c=100,200,400 kPa,kc=1.0,1.5,2.0),the relation between dynamic shear stress and dynamic shear strain accords with power function model.Dynamic shear stress increases with the increase of confining pressure σ3c or consolidation principal pressure ratio kc;under condition of anisotropic consolidation stress,Xigeda formation siltstone in Xichang city produces larger dynamic shear strain than that obtained under condition of isotropic consolidation stress.Under condition of different consolidation stresses,dynamic shear modulus increases with the increase of confining pressure or consolidation principal pressure ratio,and decreases with the increase of dynamic shear strain and stabilizes.Power function correlations among maximum dynamic shear modulus Gd0 and σ3c/Pa、kc are obtained,respectively.Damping ratio increases with the increase of dynamic shear strain,but the amplitude of increase becomes smaller rapidly;it decreases with the increase of confining pressure or consolidation principal pressure ratio;Power function correlations between(λ/λmax)and(1-Gd/Gd0) are obtained and normalized under condition of different consolidation stresses.Dynamic shear stress τd increases with the increase of confining pressure σ3c or consolidation principal pressure ratio kc,but decreases with the increase of vibration number.The ratio τd/σm decreases with the increase of confining pressure σ3c,but increases with the increase of consolidation principal pressure kc;dynamic shear stress τd has linear relations with the mean pressure σm and the consolidation principal pressure ratio kc,respectively.
引文
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[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 Wei-bin,JIANG Guo-fang.Study on seismicity of Daliangshan and Anninghe-Zemuhe fault zones[J].Journal of Seismological 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述评[J].世界地震工程,2003,19(1):88-95(SUN Jing,YUANXiao-ming.A state-of-art of research on dynamic modulus and damping ratio of soils[J].World EarthquakeEngineering,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 Bing-hui,CHEN Guo-xing,WANG Jing-hui.Experimental study on dynamic characteristics of Ningbo’soffshore sediment soils[J].Journal of Natural Disasters,2007,16(4):55-60(in Chinese))
[5]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 SoilMechanics,2007,28(8):1551-1556(in Chinese))
[6]岑威钧,顾淦臣,闵家驹等.黄土动力特性试验及深厚黄土地基上土石坝抗震分析研究[J].岩土力学,2010,31(1):187-192(CEN Wei-jun,GU Gan-chen,MIN Jia-ju,et al.Test of dynamic properties of loess and studyon resistance of earthquake impact for earth-rock dam on deep loess foundation[J].Rock and Soil Mechanics,2010,31(1):187-192(in Chinese))
[7]李又云,谢永利,刘保健.路基压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 You-yun,XIE Yong-li.Experimental research on dynamic characteristics of roadbed compaction loess[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(5):1037-1046(in Chinese))
[8]黄博,陈云敏,殷建华等.粉土和粉砂的动力特性试验研究[J].浙江大学学报(工学版),2002,36(2):143-147(HUANG Bo,CHEN Yun-min,YIN Jian-hua,et al.Laboratory study on dynamic properties of silt and siltysand[J].Journal of Zhejiang University(Engineering Science),2002,36(2):143-147(in Chinese))
[9]王权民,李刚,陈正汉等.厦门砂土的动力特性研究[J].岩土力学,2005,26(10):1628-1632(WANG Quan-min,LI Gang,CHENG Zheng-han,et al.Research on dynamic characteristics of sands in Xiamen city[J].Rockand Soil Mechanics,2005,26(10):1628-1632(in Chinese))
[10]鲍陈阳,余湘娟,高志兵.云南粉土的动力特性试验研究[J].防灾减灾工程学报,2006,26(3):321-325(BAOChen-yang,YU Xiang-juan,GAO Zhi-bing.Laboratory study on dynamic properties of silty soil[J].Journal ofDisaster Prevention and Mitigation Engineering,2006,26(3):321-325(in Chinese))
[11]杨秀竹,王星华,雷金山.等压固结条件下湘江饱和砂土动力特性研究[J].振动与冲击,2007,26(9):146-148(YANG Xiu-zhu,WANG Xing-hua,LEI Jin-shan.Study on dynamic characteristic of saturated sand of Xiangjiangrive under condition of isotropic consolidation[J].Journal of Vibration and Shock,2007,26(9):146-148(inChinese))
[12]张黎明,王在泉,李华峰等.粉砂岩峰后破坏区应力脆性跌落的试验和本构方程研究[J].试验研究,2008,23(3):234-240(ZHANG Li-ming,WANG Zai-quan,LI Hua-feng,et al.Theoretical and experimental study onsiltstone brittle stress drop in post-failure region[J].Journal of Experimental Mechanics,2008,23(3):234-240(in Chinese))
[13]尹土兵,李夕兵,周子龙等.粉砂岩高温后动态力学特性研究[J].地下空间与工程学报,2007,3(6):1060-1063(YIN Tu-bing,LI Xi-bing,ZHOU Zi-long,et al.Study on mechanical properties of post-high-temperaturesandstone[J].Chinese Journal of Underground Space and Engineering,2007,3(6):1060-1063(in Chinese))
[14]尹土兵,李夕兵,洪亮等.高温后粉砂岩冲击破碎特性研究[J].南华大学学报(自然科学版),2009,23(1):45-47(YIN Tu-bing,LI Xi-bing,et al.Experimental study on impact fragmentation characteristics of siltstone after hightemperature[J].Journal of University of South China(Natural Science),2009,23(1):45-47(in Chinese))
[15]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 Hui-jun,NIE De-xin.The overview of the Xigeda strata’study[J].Advance in Earth Sciences,2004,19(Supp 1):80-82(in Chinese))
[16]李刚,陈正汉,王权民.厦门市海积粉细砂动力特性试验研究[J].四川建筑科学研究,2002,28(2):33-36(LIGang,CHEN Zheng-han,WANG quan-min.The experimental study of dynamic characteristic of fine silt inXiamen[J].Building Science Research of Sichuan,2002,28(2):33-36(in Chinese))
[17]刘方成,尚守平,王海东.固结压力相关的黏土动力特性模型研究及应用[J].岩土力学,2010,31(5):1437-1444(LIU Fang-cheng,SHANG Shou-ping,WANG Hai-dong.Research on consolidation pressure correlationdynamic properties model of clay and its application[J].Rock and Soil Mechanics,2010,31(5):1437-1444(inChinese))
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