饱和黏性土最大动剪切模量的室内和原位试验对比研究
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摘要
对463组饱和黏性土原状土样室内试验的最大动剪切模量和同一位置现场原位试验确定的最大动剪切模量进行了对比研究。结果表明:原状土样室内试验和同一位置的现场原位试验所确定的动剪切模量相差很大,室内试验结果基本上小于现场试验结果,埋藏深的土样相差更大;室内试验的最大动剪切模量与深度符合指数规律,并得到了室内试验最大动剪切模量与现场剪切波速的统计经验关系式。通过工程实例比较了两种试验最大动剪切模量对地震反应分析的影响,室内试验最大动剪切模量与现场剪切波速的关系统计式在工程场地地震反应分析中具有一定的参考应用价值。
Considering the importance of the maximum dynamic shear modulus of saturated clay soils in calculation,lab and in-situ tests are performed.According to the 463 tests finished in the past several years,the values of the dynamic shear modulus of the same soil are different in the lab and in-situ tests.The results obtained from the lab tests are mostly less than those from the in-situ tests,and the differences become greater with the increase of depth.Based on the relationships of the maximum dynamic shear modulus in lab tests with the depth,which follows the exponential function,the statistical formula of the maximum dynamic shear modulus in lab tests and the shear wave velocity in in-situ tests are obtained.Finally,the maximum shear modulus Gmax derived from the above formula is applied in the case of ground seismic response computation,in which Gmax obtained from the in-situ tests is also used.The results show that the statistical formula is reasonable and practicable,and the differences of the maximum shear moduli obtained in different ways will have great effects on the peak ground acceleration and the characteristic period of the seismic response spectra.
Considering the importance of the maximum dynamic shear modulus of saturated clay soils in calculation,lab and in-situ tests are performed.According to the 463 tests finished in the past several years,the values of the dynamic shear modulus of the same soil are different in the lab and in-situ tests.The results obtained from the lab tests are mostly less than those from the in-situ tests,and the differences become greater with the increase of depth.Based on the relationships of the maximum dynamic shear modulus in lab tests with the depth,which follows the exponential function,the statistical formula of the maximum dynamic shear modulus in lab tests and the shear wave velocity in in-situ tests are obtained.Finally,the maximum shear modulus Gmax derived from the above formula is applied in the case of ground seismic response computation,in which Gmax obtained from the in-situ tests is also used.The results show that the statistical formula is reasonable and practicable,and the differences of the maximum shear moduli obtained in different ways will have great effects on the peak ground acceleration and the characteristic period of the seismic response spectra.
引文
[1]王绍博,丁海平.土动力参数对土层动力反应的影响[J].地震工程与工程振动,2001,21(1):105–108.(WANG Shao-bo,DING Hai-ping.Effect of soil dynamic parameters on seismic responses of soil layers[J].Earthquake Engineering and Engineering Vibration,2001,21(1):105–108.(in Chinese))
[2]冯志仁,郭德存,刘红帅,等.最大剪切模量对土动力参数及地震反应的影响[J].自然灾害学报,2007,16(3):90–95.(FENG Zhi-ren,GUO De-cun,LIU Hong-shuai,et al.Influence of maximum shear modulus on dynamic parameters and seismic response of soil layer[J].Journal of Natural Disasters,2007,16(3):90–95.(in Chinese))
[3]孙静,袁晓铭,孙锐.土动剪切模量和阻尼比的推荐值和规范值的合理性比较[J].地震工程与工程振动,2004,24(4):125–133.(SUN Jing,YUAN Xiao-ming,SUN Rui.Reasonability comparison between recommended and code values of dynamic shear modulus and damping ratio of soils[J].Earthquake Engineering and Engineering Vibration,2004,24(4):125–133.(in Chinese))
[4]SEED H B,IDRISS I M.Soil moduli and damping factors for dynamic response analysis(Report No70-10)[R].Berkeley Calif:EERC,1970.
[5]KAGAWA T.Moduli and damping factors of soft marine clays[J].Journal of Geotechnical Engineering,1992,118(G79):1360–1375.
[6]石兆吉,丰万玲.土壤动压缩模量共振柱法测定[J].岩土工程学报,1985,7(6):25–32.(SHI Zhao-ji,FENG Wan-ling.Determination of dynamic compressive modulus using resonant column device[J].Chinese Journal of Geotechnical Engineering,1985,7(6):25–32.(in Chinese))
[7]徐存森,吴俊壁.用扭转单剪、共振柱仪测定空心试样土的动剪切模量[J].大坝观测与土工测试,1992,16(1):37–43.(XU Cun-sen,WU Jun-bi.Determination of dynamic shear modulus of hollow soil sample using stokoe type torsional simple shear and resonant column device[J].Dam Observation and Geotechnical Testing,1992,16(1):37–43.(in Chinese))
[8]蒋寿田,王幸辛.郑州地区地基原状土动模量和阻尼比[C]//第三届全国土动力学学术会议.上海:同济大学出版社,1990:151–155.(JIANG Shou-tian,WANG Xing-xin.Dynamic modulus and damping ratio of undisturbed soil in Zhengzhou[C]//The 3rd China Conference of Soil Dynamics.Shanghai:Tongji University Press,1990:151–155.(in Chinese))
[9]尚守平,卢华喜,任慧,等.粉质黏土动剪切模量的试验对比研究[J].岩土工程学报,2006,28(3):410–414.(SHANG Shou-ping,LU Hua-xi,REN Hui,et al.Comparative study on dynamic shear modulus of silty clay[J].Chinese Journal of Geotechnical Engineering,2006,28(3):410–414.(in Chinese))
[10]MARSHALL L ew.Correlations of Seismic Velocity with Depth[C]//International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics.USA,1981.
[11]高玉峰,刘汉龙.合肥膨胀土剪切波速的特征分析[J].岩土工程学报,2003,25(3):371–373.(GAO Yu-feng,LIU Han-long.Study on shear wave velocities in expansive soils of Hefei[J].Chinese Journal of Geotechnical Engineering,2003,25(3):371–373.(in Chinese))
[2]冯志仁,郭德存,刘红帅,等.最大剪切模量对土动力参数及地震反应的影响[J].自然灾害学报,2007,16(3):90–95.(FENG Zhi-ren,GUO De-cun,LIU Hong-shuai,et al.Influence of maximum shear modulus on dynamic parameters and seismic response of soil layer[J].Journal of Natural Disasters,2007,16(3):90–95.(in Chinese))
[3]孙静,袁晓铭,孙锐.土动剪切模量和阻尼比的推荐值和规范值的合理性比较[J].地震工程与工程振动,2004,24(4):125–133.(SUN Jing,YUAN Xiao-ming,SUN Rui.Reasonability comparison between recommended and code values of dynamic shear modulus and damping ratio of soils[J].Earthquake Engineering and Engineering Vibration,2004,24(4):125–133.(in Chinese))
[4]SEED H B,IDRISS I M.Soil moduli and damping factors for dynamic response analysis(Report No70-10)[R].Berkeley Calif:EERC,1970.
[5]KAGAWA T.Moduli and damping factors of soft marine clays[J].Journal of Geotechnical Engineering,1992,118(G79):1360–1375.
[6]石兆吉,丰万玲.土壤动压缩模量共振柱法测定[J].岩土工程学报,1985,7(6):25–32.(SHI Zhao-ji,FENG Wan-ling.Determination of dynamic compressive modulus using resonant column device[J].Chinese Journal of Geotechnical Engineering,1985,7(6):25–32.(in Chinese))
[7]徐存森,吴俊壁.用扭转单剪、共振柱仪测定空心试样土的动剪切模量[J].大坝观测与土工测试,1992,16(1):37–43.(XU Cun-sen,WU Jun-bi.Determination of dynamic shear modulus of hollow soil sample using stokoe type torsional simple shear and resonant column device[J].Dam Observation and Geotechnical Testing,1992,16(1):37–43.(in Chinese))
[8]蒋寿田,王幸辛.郑州地区地基原状土动模量和阻尼比[C]//第三届全国土动力学学术会议.上海:同济大学出版社,1990:151–155.(JIANG Shou-tian,WANG Xing-xin.Dynamic modulus and damping ratio of undisturbed soil in Zhengzhou[C]//The 3rd China Conference of Soil Dynamics.Shanghai:Tongji University Press,1990:151–155.(in Chinese))
[9]尚守平,卢华喜,任慧,等.粉质黏土动剪切模量的试验对比研究[J].岩土工程学报,2006,28(3):410–414.(SHANG Shou-ping,LU Hua-xi,REN Hui,et al.Comparative study on dynamic shear modulus of silty clay[J].Chinese Journal of Geotechnical Engineering,2006,28(3):410–414.(in Chinese))
[10]MARSHALL L ew.Correlations of Seismic Velocity with Depth[C]//International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics.USA,1981.
[11]高玉峰,刘汉龙.合肥膨胀土剪切波速的特征分析[J].岩土工程学报,2003,25(3):371–373.(GAO Yu-feng,LIU Han-long.Study on shear wave velocities in expansive soils of Hefei[J].Chinese Journal of Geotechnical Engineering,2003,25(3):371–373.(in Chinese))
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