黏性填土刚性挡土墙的地震永久位移
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摘要
目的考虑填土黏聚性对刚性挡土结构地震土压力的影响,发展便于工程设计使用的地震永久位移的计算方法.方法基于Raffnsson、Wu和Prakash方法的基本思路,考虑填土黏聚力的地震土压力解析解,建立累积位移的计算模型.考虑墙体滑移和转动两种位移模式相耦合以及地基土动力非线性,对离心机试验结果、Newmark滑块法进行对比分析.结果所得总的永久位移为0.225 7 m,略高于试验结果.其中滑动位移为0.088 2 m,与Newmark滑块法接近.结论算例表明填土黏聚力能够降低永久位移.算法简单实用,偏于安全.
For the purpose of the displacement-based seismic design of rigid retaining walls with cohesive backfill,a procedure is needed to compute seismic permanent displacement.Based on the Raffnsson,Wu and Prakash's framework and the theory on seismic earth pressure of cohesive backfill,a model was established to compute the cumulative displacement.A coupling mode of sliding and rocking was considered,and the dynamic nonlinearity of foundation soil and the cohesion of backfill soil were simulated.The applicability of the model was demonstrated by comparing data with a centrifuge test and the Newmark's slide-block method.The total displacement computed by this model was slightly greater than the one recorded during the test,and the sliding displacement was very closed to the one calculated with the Newmark's method.Permanent displacement tends to decrease with the cohesion increasing.The results show that the proposed method is simple,clear and conservative.
For the purpose of the displacement-based seismic design of rigid retaining walls with cohesive backfill,a procedure is needed to compute seismic permanent displacement.Based on the Raffnsson,Wu and Prakash's framework and the theory on seismic earth pressure of cohesive backfill,a model was established to compute the cumulative displacement.A coupling mode of sliding and rocking was considered,and the dynamic nonlinearity of foundation soil and the cohesion of backfill soil were simulated.The applicability of the model was demonstrated by comparing data with a centrifuge test and the Newmark's slide-block method.The total displacement computed by this model was slightly greater than the one recorded during the test,and the sliding displacement was very closed to the one calculated with the Newmark's method.Permanent displacement tends to decrease with the cohesion increasing.The results show that the proposed method is simple,clear and conservative.
引文
[1]刘恢先.唐山大地震震害[M].北京:地震出版社,1986.
[2]中国赴日地震考察团.日本阪神大地震考察[M].北京:地震出版社,1995.
[3]Zeng X.Seismic response of gravity quay walls I:Centrifuge modeling[J].Journal of Geotechnical andGeoenvironmental Engineering,ASCE,1998,124(5):0406-0417.
[4]Todorovski L I.An experimental study on the kinet-ics of a free standing retaining wall under seismic ex-citation[D].Texas:A&M University,1999.
[5]杨明,吴德伦,言志信.加筋土挡墙抗震分析中的屈服加速度[J].岩石力学与工程学报,2002,21(5):728-731.
[6]陈学良,陶夏新,陈宪麦,等.重力挡土墙地震反应研究评述[J].自然灾害学报,2006,15(3):139-146.
[7]Rafnsson E A,Prakash S.Stiffness and damping pa-rameters for dynamic analysis of retaining walls[C]//Proceeding of 2nd International Conference on RecentAdvances in Geotechnical Earthquake Engineeringand Soil Dynamics.Missouri:St.Louis,1991:1943-1952.
[8]Wu Y W,Prakash S.Seismic displacement of rigid re-taining walls on submergence[C]//Proceeding of12th World Conference on Earthquake Engineering.Auckland:IAEE,2000:0570.
[9]Wu Y W.Displacement-based analysis and design ofrigid retaining walls during earthquakes[D].Mis-souri:University of Missouri-Rolla,2000.
[10]Seed H B,Idriss I M.Soil moduli and damping factorsfor dynamic response analysis[R].Berkeley:Earth-quake Engineering Research Center,University ofCalifornia,1970:1-40.
[11]陈学良,陶夏新.黏性土挡土墙地震土压力解析解[C]//现代地震工程进展.南京:东南大学出版社,2002:69-77.
[12]张敏江.浸水重力式挡土墙的滑移分析[J].沈阳建筑大学学报:自然科学版,2005,21(1):5-7.
[13]陈宪麦.挡土结构抗震设计中两个重要问题的研究[D].哈尔滨:中国地震局工程力学研究所,2003.
[2]中国赴日地震考察团.日本阪神大地震考察[M].北京:地震出版社,1995.
[3]Zeng X.Seismic response of gravity quay walls I:Centrifuge modeling[J].Journal of Geotechnical andGeoenvironmental Engineering,ASCE,1998,124(5):0406-0417.
[4]Todorovski L I.An experimental study on the kinet-ics of a free standing retaining wall under seismic ex-citation[D].Texas:A&M University,1999.
[5]杨明,吴德伦,言志信.加筋土挡墙抗震分析中的屈服加速度[J].岩石力学与工程学报,2002,21(5):728-731.
[6]陈学良,陶夏新,陈宪麦,等.重力挡土墙地震反应研究评述[J].自然灾害学报,2006,15(3):139-146.
[7]Rafnsson E A,Prakash S.Stiffness and damping pa-rameters for dynamic analysis of retaining walls[C]//Proceeding of 2nd International Conference on RecentAdvances in Geotechnical Earthquake Engineeringand Soil Dynamics.Missouri:St.Louis,1991:1943-1952.
[8]Wu Y W,Prakash S.Seismic displacement of rigid re-taining walls on submergence[C]//Proceeding of12th World Conference on Earthquake Engineering.Auckland:IAEE,2000:0570.
[9]Wu Y W.Displacement-based analysis and design ofrigid retaining walls during earthquakes[D].Mis-souri:University of Missouri-Rolla,2000.
[10]Seed H B,Idriss I M.Soil moduli and damping factorsfor dynamic response analysis[R].Berkeley:Earth-quake Engineering Research Center,University ofCalifornia,1970:1-40.
[11]陈学良,陶夏新.黏性土挡土墙地震土压力解析解[C]//现代地震工程进展.南京:东南大学出版社,2002:69-77.
[12]张敏江.浸水重力式挡土墙的滑移分析[J].沈阳建筑大学学报:自然科学版,2005,21(1):5-7.
[13]陈宪麦.挡土结构抗震设计中两个重要问题的研究[D].哈尔滨:中国地震局工程力学研究所,2003.
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