坑角效应对基坑周边建筑物影响的有限元分析
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摘要
在基坑工程中,当建筑物紧邻基坑坑角时,坑外土体的不均匀沉降将导致建筑物发生挠曲变形与扭转变形,其中,挠曲变形趋势及挠曲程度取决于建筑物所跨区间内土体沉降曲线的挠曲变形特征,而扭转变形则与建筑物同坑角的相对位置紧密相关.在挠曲变形与扭转变形的共同作用下,建筑物墙体拉应变将受到坑角效应的显著影响.算例结果表明:对于纵墙平行于基坑边的建筑物,当其距坑角距离小于1倍开挖深度时,坑角效应对建筑物变形起不利作用,显著增大了建筑物的墙体拉应变,即此时建筑物是最为不利的;而当建筑物纵墙垂直于基坑边,且距坑角距离小于1倍开挖深度时,坑角效应对建筑物变形起有利作用,使得建筑物的墙体拉应变显著降低;而当建筑物距坑角距离大于1倍开挖深度时,坑角效应对建筑物墙体拉应变的影响基本可以忽略,但墙体拉应变达到最大值,即此时建筑物是最为不利的.
For the building adjacent to the excavation corner,the differential settlement caused by excavation will lead to the deflection deformation and torsion deformation of the building.The trend and degree of deflection depends on the characteristics of ground surface settlement over the cross zone of the building,and torsion deformation is closely related to the relative location between the building and the excavation corner.The impacts of the deflection deformation and torsion deformation on the tensile strain of the building are obviously influenced by corner effect.The results show that when the longitudinal walls of the building are parallel to the retaining wall and the distance between them is smaller than the excavation depth,corner effect has a negative influence on the controlling of deformation of the building.The building is in the most adverse situation in this case.When the longitudinal walls of the building are perpendicular to the retaining wall and the distance between them is smaller than the excavation depth,corner effect has a positive influence on the controlling of deformation of the building,obviously reducing the tensile strain of the wall.When the distance between the building and the corner is larger than the excavation depth,the effect on the deformation of the building can be neglected.However,the building is in the most adverse situation when the tensile strain reaches the maximum value.
For the building adjacent to the excavation corner,the differential settlement caused by excavation will lead to the deflection deformation and torsion deformation of the building.The trend and degree of deflection depends on the characteristics of ground surface settlement over the cross zone of the building,and torsion deformation is closely related to the relative location between the building and the excavation corner.The impacts of the deflection deformation and torsion deformation on the tensile strain of the building are obviously influenced by corner effect.The results show that when the longitudinal walls of the building are parallel to the retaining wall and the distance between them is smaller than the excavation depth,corner effect has a negative influence on the controlling of deformation of the building.The building is in the most adverse situation in this case.When the longitudinal walls of the building are perpendicular to the retaining wall and the distance between them is smaller than the excavation depth,corner effect has a positive influence on the controlling of deformation of the building,obviously reducing the tensile strain of the wall.When the distance between the building and the corner is larger than the excavation depth,the effect on the deformation of the building can be neglected.However,the building is in the most adverse situation when the tensile strain reaches the maximum value.
引文
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[21]Ou Chang-Yu,Liao Jui-Tang,Lin Horn-Da.Perform-ance of diaphragm wall construction using top-down method[J].Journal of Geotechnical and Geoenviron-mental Engineering,1998,124(9):798-808.
[2]Ou Chang-yu,Chiou Dar-chang,Wu Tzong-shiann.Three-dimensional element analysis of deep excava-tions[J].Journal of Geotechnical Engineering,1996,122(5):337-345.
[3]Ou Chang-yu,Shiau Bor-yuan,Wang I-wen.Three-dimension deformation behavior of the Taipei National Enterprise Center(TNEC)excavation case history[J].Canadian Geotechnical Journal,2000,37(2):438-448.
[4]Nakai Teruo,Shahin Hossain Md,Iwata Naoyuki,et al.3D effects in excavation problems:Model tests and numerical simulations[C]//Proceedings of 2nd Japan-US.Workshop on Testing,Modeling,and Simulation.Kyoto,Japan,2005:407-426.
[5]Blackburn J T,Finno R J.Three-dimensional responses observed in an internally braced excavation in soft clay[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(11):1364-1373.
[6]Finno R J,Blackburn J T,Roboski J F.Three-dimensional effects for supported excavations in clay[J].Journal of Geotechnical and Geoenvironmental Engi-neering,2007,133(1):30-36.
[7]Boscardin M D,Cording E J.Buliding resopnse to ex-cavation-induced stettlement[J].Journal of Geotechnical Engineering,1989,115(1):1-21.
[8]Son Moorak,Coording E J.Estimation of building dam-age due to excavation-induced ground movements[J].Journal of Geotechnical and Geoenvironmental Engi-neering,2005,131(2):162-177.
[9]Finno R J,Voss Jr F T,Rossow E,et al.Evaluating damage potential in buildings affected by excavations[J].Journal of Geotechnical and Geoenvironmental Engi-neering,2005,131(10):1199-1210.
[10]Schuster Matt,Kung Gordon Tung-Chun,Juang C H,et al.Simplified model for evaluating damage potential of buildings adjacent to a braced excavation[J].Journal of Geotechnical and Geoenvironmental Engineering,2009,135(12):1823-1835.
[11]Brinkgreve R B J,Swolfs W M,Beuth L,et al.PLAXIS 3D Foundation Material Models Manual Version 2[M].Delft:PLAXIS bv,2007.
[12]Vermeer P A.Small-Strain Stiffness of Soils and Its Nu-merical Consequences[M].Stuttgart:Thomas Benz,2007.
[13]刘畅,郑刚,张书鸳.逆作法施工坑底回弹对支护结构的影响[J].天津大学学报,2007,40(8):995-1001.Liu Chang,Zheng Gang,Zhang Shuyuan.Effect of foundation bottom heave due to excavation on supporting system in top-down method[J].Journal of Tianjin Uni-versity,2007,40(8):995-1001(in Chinese).
[14]Kempfert Hans-Georg,Gebreselassie Berhane.Excava-tions and Foundations in Soft Soils[M].Berlin:Springer Verlag,2006.
[15]杜永峰,闫力.砌体结构地震损伤的识别及试验研究[C]//第四届全国防震减灾工程学术研讨会.福州,中国,2008:661-666.Du Yongfeng,Yan Li.Damage identification of ma-sonry structure and the study of experimental[C]//Fourth National Conference on Protecting Against and Mitigating Earthquake Disasters.Fuzhou,China,2008:661-666(in Chinese).
[16]顾小鲁,钱鸿缙,刘惠珊,等.地基与基础[M].3版.北京:中国建筑工业出版社,2003.Gu Xiaolu,Qian Hongjin,Liu Huishan,et al.Ground and Foundation[M].3rd ed.Beijing:China Architec-ture and Building Press,2003(in Chinese).
[17]Mitchell J K,Soga Kenichi.Fundamentals of Soil Be-havior[M].3rd ed.Hoboken:John Wiley&Sons,2005.
[18]王卫东,王建华.支护结构与主体结构相结合的设计、分析与实例[M].北京:中国建筑工业出版社,2007.Wang Weidong,Wang Jianhua.Design,Analysis and Case Histories of Deep Excavations Supported by Per-manent Structures[M].Beijing:China Architecture and Building Press,2007(in Chinese).
[19]龚东庆,郑渊仁.硬化土体模型分析基坑挡土壁与地盘变形的评估[J].岩土工程学报,2010,32(S2):175-178.Kung Gordon Tung-Chin,Jheng Uen-Zen.Evaluation of analyzing excavation-induced wall deflection and ground movement using hardening soil models[J].Chi-nese Journal of Geotechnical Engineering,2010,32(S2):175-178(in Chinese).
[20]Hsieh Pio-Go,Ou Chang-Yu.Shape of ground surface settlement profiles caused by excavation[J].Canadian Geotechnical Journal,1998,35(6):1004-1017.
[21]Ou Chang-Yu,Liao Jui-Tang,Lin Horn-Da.Perform-ance of diaphragm wall construction using top-down method[J].Journal of Geotechnical and Geoenviron-mental Engineering,1998,124(9):798-808.
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