固原重塑黄土动力特性共振柱试验研究
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摘要
利用GCTS共振柱测试仪研究了干密度和固结压力对固原黄土重塑土动剪切模量和阻尼比的影响及试验数据误差的基本规律。通过设计不同工况的试验条件,对比分析结果表明:相同含水率条件下,最大动剪切模量G_(dmax)随固结压力和干密度的增大而增大。相同干密度条件下,黄土的动剪切模量比随围压的增大而增大;阻尼比随围压的增大而减小;相同围压条件下,黄土动剪切模量比随干密度的增大而增大,阻尼比随干密度的增大而减小;不同剪应变特征点的动剪切模量比和阻尼比试验数据呈现一定的离散性,且离散程度阻尼比明显高于动剪切模量比。研究成果可为该地区场地地震反应分析及工程建设提供基础资料。
Dynamic shear modulus and damping ratio are important indicators in characterizing the mechanical properties of soil under the action of an earthquake. The influences of dry density and consolidation pressure on the dynamic shear modulus and damping ratio of remolded loess in Guyuan, and the basic rule of the error of test data were studied by the GCTS resonant column apparatus. The comparative analysis results under different test conditions indicated that the maximum dynamic shear modulus increases with increasing consolidation pressure and dry density under constant moisture content. Under the same dry density, the dynamic shear modulus ratio of loess increases and the damping ratio decreases with increasing confining pressure. Under the same confining pressure, the dynamic shear modulus ratio of loess increases and the damping ratio decreases with increasing dry density. The test data of dynamic shear modulus ratio and damping ratio of different shear strain points showed a certain discreteness, and the discrete degree of the damping ratio was obviously higher than that of the dynamic shear modulus ratio. The research results can provide basic information for local seismic response analysis and engineering construction.
Dynamic shear modulus and damping ratio are important indicators in characterizing the mechanical properties of soil under the action of an earthquake. The influences of dry density and consolidation pressure on the dynamic shear modulus and damping ratio of remolded loess in Guyuan, and the basic rule of the error of test data were studied by the GCTS resonant column apparatus. The comparative analysis results under different test conditions indicated that the maximum dynamic shear modulus increases with increasing consolidation pressure and dry density under constant moisture content. Under the same dry density, the dynamic shear modulus ratio of loess increases and the damping ratio decreases with increasing confining pressure. Under the same confining pressure, the dynamic shear modulus ratio of loess increases and the damping ratio decreases with increasing dry density. The test data of dynamic shear modulus ratio and damping ratio of different shear strain points showed a certain discreteness, and the discrete degree of the damping ratio was obviously higher than that of the dynamic shear modulus ratio. The research results can provide basic information for local seismic response analysis and engineering construction.
引文
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[7] 徐洁,赵文博,陈永辉,等.非饱和黄土初始剪切模量与孔径分布试验研究[J].岩土工程学报,2017,39(增刊1):227-231.XU Jie,ZHAO Wenbo,CHEN Yonghui,et al.Experimental Study on Initial Shear Modulus and Pore-size Distribution of Unsaturated Loess[J].Chinese Journal of Geotechnical Engineering,2017,39(Supp1):227-231.
[8] 谭慧明,付惠姣,梅涛涛,等.埋深对黏性土动剪切模量和阻尼比影响试验研究[J].地震工程与工程振动,2015,35(6):136-143.TAN Huiming,FU Huijiao,MEI Taotao,et al.Experimental Study on the Influence of Buried Depth on Dynamic Shear Modulus and Damping Ratio of Cohesive Soil[J].Earthquake Engineering and Engineering Dynamics,2015,35(6):136-143.
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[12] SL237-1999土工试验规程[S].北京:中国水利水电出版社,1999.SL237-1999 Specification of Soil Test[S].Beijing:China WaterPower Press,1999.
[13] 曹文冉,许浩,罗小桥,等.中砂动力学参数的共振柱试验研究[J].石油工程建设,2016,42(1):29-33.CAO Wenran,XU Hao,LUO Xiaoqiao,et al.Resonant Column Test on Dynamic Parameters of Medium Sand[J].Petroleum Engineering Construction,2016,42(1):29-33.
[14] 孔令伟,臧濛,郭爱国,等.湛江黏土动剪切模量的结构损伤效应与定量表征[J].岩土工程学报,2017,39(12):2149-2157.KONG Linwei,ZANG Meng,GUO Aiguo,et al.Structural Damage Effect on Dynamic Shear Modulus of Zhanjiang Clay and Quantitative Characterization[J].Chinese Journal of Geotechnical Engineering,2017,39(12):2149-2157.
[15] 蔡晓光,黄鑫,孟凡超,等.中线法底流尾矿砂的共振柱试验研究[J].地震工程与工程振动,2016,36(6):30-37.CAI Xiaoguang,HUANG Xin,MENG Fanchao,et al.The Resonant Column Test Study of the Central Line Underflow Tailing Sands[J].Earthquake Engineering and Engineering Dynamics,2016,36(6):30-37.
[16] 李晓飞,孙锐,袁晓铭.砂土动剪切模量比和阻尼比共振柱试验误差研究[J].哈尔滨工业大学学报,2016,48(11):155-161.LI Xiaofei,SUN Rui,YUAN Xiaoming.Resonant Column Test Error Analysis for Dynamic Shear Modulus Ratio and Damping Ratio of Sand[J].Journal of Harbin Institute of Technology University,2016,48(11):155-161.
[17] 罗飞,朱占元,田永丁.围压对粉质粘土动力学参数影响的共振柱试验研究[J].防灾减灾工程学报,2013:119-123.LUO Fei,ZHU Zhanyuan,TIAN Yongding.Resonant Column Experimental Study on Influence of Confining Pressure on Dynamic Parameters of Silty Clay[J].Journnal of Disaster Prevention and Mitigation Engineering,2013:119-123.
[18] 王帅,孙静.各类土的动剪切模量和阻尼比的研究[J].长春工程学院学报(自然科学版),2014,15(4):9-12.WANG Shuai,SUN Jing.The Research on Dynamic Shear Modulus and Damping Ratio All Kinds of Soil[J].Journal of Changchun Institute of Engineering (Natural Science),2014,15(4):9-12.
[19] 吕小飞,陈培雄,杨义菊,等.海洋粉质粘土共振柱试验研究[J].世界地震工程,2010,26(增刊1):1-5.Lü Xiaofei,CEHN Peixiong,YANG Yiju,et al.The Resonant Column Test Study on Marine Silty Clay[J].World Earthquake Engineering,2010,26(Supp1):1-5.
[20] 孙静,袁晓铭,陶夏新.共振柱试验机试验误差分析[J].哈尔滨工业大学学报,2007,39(4):510-513.SUN Jing,YUAN Xiaoming,TAO Xiaxin.Error Analysis of Resonant Column Device Tests[J].Journal of Harbin Institute of Technology University,2007,39(4):510-513.
[2] 邓津,王兰民,张振中,等.我国黄土的微结构类型与震陷区域划分[J].地震工程学报,2013,35(3):664-670.DENG Jin,WANG Lanmin,ZHANG Zhenzhong,et al.The China Loess Microst-ucture Types and Its Seismic Subsidence Zones Divided[J].Chinese Journal of Earthquake Engineering,2013,35(3):664-670.
[3] 邓津,王兰民,吴志坚,等.弹塑性黄土微结构与动变形模型的建立与分析[J].岩石力学与工程学报,2013,32(增刊2):3995-4001.DENG Jin,WANG Lanmin,WU Zhijian,et al.Establishment and Analysis of Elasto-Plastic Loess Microstructure and Dynamic Deformation Model[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(Supp2):3995-4001.
[4] 黄博,陈云敏,殷建华.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 Yunmin,YIN Jianhua.Laboratory Study on Dynamic Properties of Silt and Silty Sand[J].Journal of Zhejiang University (Engineering Science),2002,36(2):143-147.
[5] 黄志全,李磊,贾景超,等.非饱和黄土动剪切模量和阻尼比共振柱试验研究[J].人民长江,2015,46(5):69-72.HUANG Zhiquan,LI Lei,JIA Jingchao,et al.Study of Resonant Column Experiment of Dynamic Shear Module and Damping Ratio of Unsaturated Loess[J].Yangtze River,2015,46(5):69-72.
[6] 李晓飞,汪云龙,孙锐.动剪切模量阻尼比试验误差及对地震动影响风险评价[J].振动与冲击,2017,36(19):195-205.LI Xiaofei,WANG Yunlong,SUN Rui.Test Errors of Dynamic Shear Modulus and Damping Ratio and Their Effects on the Risk Assessment for Surface Ground Motions[J].Journal of Vibration and Shock,2017,36(19):195-205.
[7] 徐洁,赵文博,陈永辉,等.非饱和黄土初始剪切模量与孔径分布试验研究[J].岩土工程学报,2017,39(增刊1):227-231.XU Jie,ZHAO Wenbo,CHEN Yonghui,et al.Experimental Study on Initial Shear Modulus and Pore-size Distribution of Unsaturated Loess[J].Chinese Journal of Geotechnical Engineering,2017,39(Supp1):227-231.
[8] 谭慧明,付惠姣,梅涛涛,等.埋深对黏性土动剪切模量和阻尼比影响试验研究[J].地震工程与工程振动,2015,35(6):136-143.TAN Huiming,FU Huijiao,MEI Taotao,et al.Experimental Study on the Influence of Buried Depth on Dynamic Shear Modulus and Damping Ratio of Cohesive Soil[J].Earthquake Engineering and Engineering Dynamics,2015,35(6):136-143.
[9] 孙静.岩土动剪切模量阻尼试验及应用研究[D].哈尔滨:中国地震局工程力学研究所,2004.SUN Jing.Experiment and Application Studies of Dynamic Shear Modulus and Damping of Geotechnical Media[D].Haerbin:Institute of Engineering Mechanics China Seismological Bureau,2004.
[10] 黄志全,郭芳洁,贾景超,等.郑州饱和粉土动剪切模量的试验研究[J].华北水利水电大学学报(自然科学版),2016,37(1):64-68.HUANG Zhiquan,GUO Fangjie,JIA Jingchao,et al.Experimental Investigation on Dynamic Shear Modulus of Saturated Silt in Zhengzhou[J].Journal of North China University of Water Resources and Electric Power (Natural Science Edition),2016,37(1):64-68.
[11] 谢定义.土动力学[M].北京:高等教育出版社,2011.XIE Dingyi.Soil Dynamics[M].Beijing:Higher Education Press,2011.
[12] SL237-1999土工试验规程[S].北京:中国水利水电出版社,1999.SL237-1999 Specification of Soil Test[S].Beijing:China WaterPower Press,1999.
[13] 曹文冉,许浩,罗小桥,等.中砂动力学参数的共振柱试验研究[J].石油工程建设,2016,42(1):29-33.CAO Wenran,XU Hao,LUO Xiaoqiao,et al.Resonant Column Test on Dynamic Parameters of Medium Sand[J].Petroleum Engineering Construction,2016,42(1):29-33.
[14] 孔令伟,臧濛,郭爱国,等.湛江黏土动剪切模量的结构损伤效应与定量表征[J].岩土工程学报,2017,39(12):2149-2157.KONG Linwei,ZANG Meng,GUO Aiguo,et al.Structural Damage Effect on Dynamic Shear Modulus of Zhanjiang Clay and Quantitative Characterization[J].Chinese Journal of Geotechnical Engineering,2017,39(12):2149-2157.
[15] 蔡晓光,黄鑫,孟凡超,等.中线法底流尾矿砂的共振柱试验研究[J].地震工程与工程振动,2016,36(6):30-37.CAI Xiaoguang,HUANG Xin,MENG Fanchao,et al.The Resonant Column Test Study of the Central Line Underflow Tailing Sands[J].Earthquake Engineering and Engineering Dynamics,2016,36(6):30-37.
[16] 李晓飞,孙锐,袁晓铭.砂土动剪切模量比和阻尼比共振柱试验误差研究[J].哈尔滨工业大学学报,2016,48(11):155-161.LI Xiaofei,SUN Rui,YUAN Xiaoming.Resonant Column Test Error Analysis for Dynamic Shear Modulus Ratio and Damping Ratio of Sand[J].Journal of Harbin Institute of Technology University,2016,48(11):155-161.
[17] 罗飞,朱占元,田永丁.围压对粉质粘土动力学参数影响的共振柱试验研究[J].防灾减灾工程学报,2013:119-123.LUO Fei,ZHU Zhanyuan,TIAN Yongding.Resonant Column Experimental Study on Influence of Confining Pressure on Dynamic Parameters of Silty Clay[J].Journnal of Disaster Prevention and Mitigation Engineering,2013:119-123.
[18] 王帅,孙静.各类土的动剪切模量和阻尼比的研究[J].长春工程学院学报(自然科学版),2014,15(4):9-12.WANG Shuai,SUN Jing.The Research on Dynamic Shear Modulus and Damping Ratio All Kinds of Soil[J].Journal of Changchun Institute of Engineering (Natural Science),2014,15(4):9-12.
[19] 吕小飞,陈培雄,杨义菊,等.海洋粉质粘土共振柱试验研究[J].世界地震工程,2010,26(增刊1):1-5.Lü Xiaofei,CEHN Peixiong,YANG Yiju,et al.The Resonant Column Test Study on Marine Silty Clay[J].World Earthquake Engineering,2010,26(Supp1):1-5.
[20] 孙静,袁晓铭,陶夏新.共振柱试验机试验误差分析[J].哈尔滨工业大学学报,2007,39(4):510-513.SUN Jing,YUAN Xiaoming,TAO Xiaxin.Error Analysis of Resonant Column Device Tests[J].Journal of Harbin Institute of Technology University,2007,39(4):510-513.