地震作用下加筋挡土墙筋带拉力计算研究
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摘要
基于地基剪切梁理论,研究了水平地震激励下条带式加筋挡土墙筋带的拉力响应。把加筋土看成宏观上均匀的复合材料,筋带当作土体增强材料,基于地基剪切梁理论得到墙后填土水平方向的动剪切应变;筋带和周围土体一起运动,筋带的运动受周围土体控制,其破坏取决于筋带所能承受变形的大小,因此将筋带简化为一维无质量弹性杆,则可得筋带轴向应变等于墙后填土水平方向的动剪切应变;通过胡克定律建立筋带动拉力方程,求解简谐地震作用下筋带的动拉力解析解。将提出的计算方法用于一工程实例,进行了筋带的拉力分析。用有限元软件ADINA进行了对比分析,验证提出计算方法的合理性,表明该计算方法安全、可靠。
Based on the shear beam theory,the seismic response of bar tension in reinforced earth retaining wall under horizontal earthquake loads is investigated.In this study,the reinforced soil is regarded as macroscopically well-distributed composite material,and the reinforcement strip is regarded as reinforcing material.Based on the shear beam model,the shear strain of backfill soil under horizontal earthquake loads is obtained.The reinforcement strip moves with the soil body around,and the movement is simultaneously restricted by it.The destructive power of reinforcement strip depends on the size of its deformation,so the reinforcement strip can be simplified as one-dimensional elastic rod.In view of these assumptions,one can get the fact that the axial strain of reinforcement strip equals the horizontal shear strain of backfill soil.Furthermore,a dynamic tension equation is established by means of the Hooke's law to analyze the dynamic tension of reinforcement strip under the harmonic earthquake loads.The proposed method is used to a practical application to conduct the seismic analysis.At last,the method is analyzed by using the finite element software(ADINA) to verify its rationality.The results of show that the proposed method is safe and reliable.
Based on the shear beam theory,the seismic response of bar tension in reinforced earth retaining wall under horizontal earthquake loads is investigated.In this study,the reinforced soil is regarded as macroscopically well-distributed composite material,and the reinforcement strip is regarded as reinforcing material.Based on the shear beam model,the shear strain of backfill soil under horizontal earthquake loads is obtained.The reinforcement strip moves with the soil body around,and the movement is simultaneously restricted by it.The destructive power of reinforcement strip depends on the size of its deformation,so the reinforcement strip can be simplified as one-dimensional elastic rod.In view of these assumptions,one can get the fact that the axial strain of reinforcement strip equals the horizontal shear strain of backfill soil.Furthermore,a dynamic tension equation is established by means of the Hooke's law to analyze the dynamic tension of reinforcement strip under the harmonic earthquake loads.The proposed method is used to a practical application to conduct the seismic analysis.At last,the method is analyzed by using the finite element software(ADINA) to verify its rationality.The results of show that the proposed method is safe and reliable.
引文
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[20]R.W.克拉夫,J.彭津.结构动力学[M].王光远,译.北京:科学出版社,1981.(CLOUGH R W,PENG Jin.Structuredynamic[M].WANG Guang-yuan,trans.Beijing:SciencePress,1981.(in Chinese))
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[22]贾亮.加筋挡土墙的地震作用和动力稳定性分析[D].兰州:兰州理工大学,2011.(JIA Liang.Seismic response anddynamic stability analysis of reinforced earth retainingwall[D].Lanzhou:Lanzhou University of Technology,2011.(in Chinese))
[23]胡聿贤.地震工程学[M].北京:地震出版社,1988.(HUYu-xian.Earthquake engineering[M].Beijing:EarthquakePress,1988.(in Chinese))
[2]LING H I,LESHCHINSKY D,CHOU N N S.Post-earthquakeinvestigation on several geosynthetic-reinforced soil retainingwalls and slops during Ji-Ji earthquake of Taiwan[J].SoilDynamic and Earthquake Engineering,2001(21):297-313.
[3]RACE R,DEL Cid H.Seismic performance of modular blockretaining wall structures during the January 2001 El Salvadorearthquake[C]//Geosynthetic Engineering Forum 2001,Taipei.2001:125-144.
[4]姚令侃,陈强.“5.12”汶川地震对线路工程抗震技术提出的新课题[J].四川大学学报(工程科学版),2009,41(3):43-50.(YAO Ling-kan,CHENG Qiang.New researchsubjects on earthquake resistant techniques of lineengineering extracted from“5.12”Wenchuan earthquake[J].Journal of Sichuan University(Engineering Science Edition),2009,41(3):43-50.(in Chinese))
[5]王建,姚令侃,陈强.汶川地震路堤成灾模式及土工格栅加筋变形控制研究[J].岩石力学与工程学报,2010,29(增刊1):302-311.(WANG Jian,YAO Ling-kan,CHENQiang.Research on failure mode of road embankment inWenchuan great earthquake and deformation control ofgeogrid reinforcement[J].Chinese Journal of RockMechanics and Engineering,2010,29(S1):302-311.(inChinese))
[6]周波,范洪海.汶川地震对加筋挡土墙的影响分析[J].路基工程,2011(3):83-85.(ZHOU Bo,FAN Hong-hai.Theinfluence of analysis of Wenchuan earthquake on reinforcedearth retaining wall[J].Sugared Engineering,2011(3):83-85.(in Chinese))
[7]姚令侃,冯俊德,杨明.汶川地震路基灾害分析及对抗震规范改进的启示[J].西南交通大学学报,2009,44(3):3387-3393.(YAO Ling-kan,FENG Jun-de,YANG Ming.Damage analysis of subgrade engineering in Wenchuanearthquake and recommendation for improving seismicdesign code[J].Journal of Southwest Jiaotong University,2009,44(3):3387-3393.(in Chinese))
[8]周德培,张建经,汤涌.汶川地震中道路边坡工程震害分析[J].岩石力学与工程学报,2010,29(3):565-575.(ZHOU De-pei,ZHANG Jian-jing,TANG Yong.Seismicdamage analysis of road slopes in Wenchuan earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(3):565-575.(in Chinese))
[9]JTJ015—91公路加筋土工程设计规范[S].1991.(JTJ015—91 Highway reinforced engineering design specifications[S].1991.(in Chinese))
[10]刘华北.地震作用下模块式面板土工合成材料加筋土挡墙的内部稳定分析[J].岩土工程学报,2008,30(2):278-283.(LIU Hua-bei.Internal stability analysis of segmentalgeosynthetic-reinforced soil retaining walls subjected toseismic loading[J].Chinese Journal of GeotechnicalEngineering,2008,30(2):278-283.(in Chinese))
[11]李海深,杨果林,邹银生.加筋土挡土墙动力特性分析[J].中国公路学报,2004,17(2):28-31.(LI Hai-shen,YANGGuo-lin,ZOU Yin-sheng.Analysis of dynamic character ofreinforced earth retaining wall[J].Chinese Journal ofHighway and Transport,2004,17(2):28-31.(in Chinese))
[12]SABERMAHANI M,GHALANDARZADEH A,FAKHERA.Experimental study on seismic deformation modes ofreinforced-soil walls[J].Geotextiles and Geomembranes,2009,27(2):121-136.
[13]LATHA M G,KRISHNA M A.Seismic response ofreinforced soil retaining wall models:influence of backfillrelative density[J].Geotextiles and Geomembranes,2008,26(4):335-349.
[14]LESHCHINSKY D,LING H I,WANG J P,et al.Equivalentseismic coefficient in geocell retention systems[J].Geotextiles and Geomembranes,2009,27(1):9-18.
[15]BATHE KJ.ADINA/ADINAT使用手册[M].赵兴华,译.北京:机械工业出版社,1986.(BATHE KJ.ADINA/ADINAT use manual[M].ZHAO Xing-hua,trans.Beijing:China Machine Press,1986.(in Chinese))
[16]M.帕兹.结构动力学理论与计算[M].李裕澈,刘勇生,译.北京:地震出版社,1993.(PARZ M.Structure dynamicstheory and calculation[M].LI Yu-che,LIU Yong-sheng,trans.Beijing:Earthquake Press,1993.(in Chinese))
[17]谢定义.土动力学[M].西安:西安交通大学出版社,1998.XIE Ding-yi.Soil dynamics[M].Xi'an:Xi'an JiaotongUniversity Press,1998.(in Chinese))
[18]李国豪.工程结构抗震动力学[M].上海:上海科学技术出版社,1980.(LI Guo-hao.Engineering structure seismicdynamics[M].Shanghai:Shanghai Science and TechnologyPress,1980.(in Chinese))
[19]沃伯顿.结构的动力性态[M].金咸定,载宗信,译.北京:地震出版社出版,1983.(WARBURTON G B.Thedynamical behavior of structures[M].JIN Xian-ding,DAIZong-xin,trans.Beijing:Earthquake Press,1983.(inChinese))
[20]R.W.克拉夫,J.彭津.结构动力学[M].王光远,译.北京:科学出版社,1981.(CLOUGH R W,PENG Jin.Structuredynamic[M].WANG Guang-yuan,trans.Beijing:SciencePress,1981.(in Chinese))
[21]NIKOLAOU A,MYLONAKIS G,GAZETAS G.Kinematicsbending moments in seismically stressed piles[R].New York:NCEER.1995.
[22]贾亮.加筋挡土墙的地震作用和动力稳定性分析[D].兰州:兰州理工大学,2011.(JIA Liang.Seismic response anddynamic stability analysis of reinforced earth retainingwall[D].Lanzhou:Lanzhou University of Technology,2011.(in Chinese))
[23]胡聿贤.地震工程学[M].北京:地震出版社,1988.(HUYu-xian.Earthquake engineering[M].Beijing:EarthquakePress,1988.(in Chinese))
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