【摘要】 在饱和土耦合作用与土和结构相互作用理论基础上,以地铁车站为例,用有限元法研究地下结构在地震液化作用下的响应。所采用的软件为动力两相体非线性有限元软件 Dyna-Swandyne-II,该软件可以应用先进的 Pastor-Zienkiewicz III 广义塑性模型模拟可液化土的动力特性,应用 u-p 形式的 Biot 方程,在有限元分析中充分考虑孔隙水与土之间的耦合,同时考虑地下结构与饱和土在动力作用下的非线性相互作用。分析了地铁车站的动力响应,包括地铁内力、加速度以及地铁位移。研究结果表明,地铁结构在地震液化作用下会产生较大的上浮,从而对结构造成比较严重的破坏;地铁结构在地震作用下的最大内力位于结构的交接处。因此,结构交接处的配筋应该格外小心。更多还原

【Abstract】 Based on the theories of coupled interaction in saturated soil and dynamic soil-structure interaction, the response of subway structure in fully saturated liquefiable soil under earthquake excitation is investigated using the effective-stress based finite element program Dyna-Swandyne-II. A generalized plasticity model, Pastor-Zienkiewicz III model, is used to model the cyclic behavior of soil; and finite element procedure based on the u-p form of Biot theory is employed to conduct the coupled analysis. The nonlinearity of the interaction between soil and subway structure is fully considered. The dynamic response of subway structure, including the internal forces, the acceleration, and the vertical and horizontal displacements, are analyzed. The results showed that the subway structure may uplift due to the earthquake induced liquefaction, which shall lead to severe damage in the structure; and that the maximum seismic internal forces occurred at the connections of the structure elements and their reinforcement must be carefully designed. ZOU De-gao, KONG Xian-jing, LING H I, et al. Experimental study on the uplift behavior of pipeline in saturated sand foundation earthquake resistant measures during an earthquake[J]. Chinese Journal of Geotechn- ical Engineering, 2002, 24(3): 323-326.[6] Chan A H C. User manual for Diana Swandyne-II[R]. Glasgow: University of Glasgow, 1989.[7] Katona M G, Zienkiewicz O C. A unified set of single step algorithms Part 3: The Beta-m method, a generalization of the newmark scheme[J]. International Journal for Numerical Methods in Engineering, 1985, 21: 1 345-1 359.[8] Zienkiewicz O C, Chan A H C, Pastor M, Schrefler B A, Shiomi T. Computational Geomechanics with Special Reference to Earthquake Engineering[M]. New York: John Wiley & Sons, 1998.[9] Chan A H C, Famiyesin O O, Muir W D. Numerical prediction for model No. 1[A]. Arulanandan K, Scott R F. Verification of Numerical Procedures for the Analysis of Soil Liquefaction Problems[C]. Rotterdam: Balkema AA, 1994. 87-108.[10] Madabhushi S P G, Zeng X. Seismic response of gravity quay wall. II: numerical modeling[J]. Journal of Geotechnical and Geoenvironmental Engineering, American Society of Civil Engineering, 1998, 124(5): 418-427.[11] Pastor M, Zienkiewicz O C, Chan A H C. Generalized plasticity and the modeling of soil behavior[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 1990, 14: 151-190.[12] Smith I M. A overview of numerical procedures used in VELACS project[A]. Arulanandan K, Scott R F. Verification of Numerical Procedures for the Analysis of Soil Liquefaction Problems[C]. Rotterdam: Balkema AA, 1994.[13] Hushmand B, Scott R F, Crouse C B. Centrifuge liquefaction tests in a laminar box[J]. Geotechnique, 1988, 38: 253-262.更多还原