地震作用下复合土钉支护边坡动力响应分析
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摘要
采用大型有限元软件ADINA对复合土钉支护边坡进行地震响应分析.地震波输入选用常用的EL-Centro波,分析内容包括支护边坡位移、加速度、土钉、锚杆的轴力时程响应.在建立有限元模型时,考虑土体和支护结构相互作用;应用非线性静动力性能的弹塑性M-C模型模拟土体;采用双线形强化模型模拟支护结构;土与支护结构相互作用由接触单元模拟.结果表明复合土钉边坡支护结构比纯土钉边坡支护结构有更好的抗震性能;普通土钉支护最大水平位移发生在边坡顶部,而复合型土钉支护发生在边坡的中上部,尤其是在施加了预应力之后,边坡在地震作用下位移明显减小;土钉和锚杆轴力在地震作用下放大显著,在滑移面附近轴力最大;位移和加速度沿着坡高逐渐增大.
By using large-scale finite element software ADNIA,the seismic response of the slope supported by composite soil nailing was analyzed,in which the common EL-Centro wave was selected as the input earthquake wave.The analysis included the displacement and acceleration of the supporting slope as well as the time history responses of the axial forces of soil nails and anchors.In the establishment of finite element model,the interaction between soil body and supporting structure was considered.An elastic-plastic M-C model with nonlinear static and dynamic behavior was used to simulate the soil body and a dual linear strengthening model was adopted to simulate the supporting structure.Then the interaction between soil body and supporting structure was simulated with contact element.The results showed that the supporting structure with composite soil nailing slope had better anti-seismic performance than the supporting structure with general soil nailing slope.The maximum horizontal displacement of the latter occurred at the slope top,but that of the former occurred at the slope upper middle.Especially after the imposition of the prestress,the slope displacement under earthquake would reduce significantly,and the axial forces of soil nails and anchors under earthquake would increase significantly.Moreover,the axial forces of soil nails and anchors would reach their maximum values near the slipping surface.The displacement and the acceleration of slope increased with the slope height.
By using large-scale finite element software ADNIA,the seismic response of the slope supported by composite soil nailing was analyzed,in which the common EL-Centro wave was selected as the input earthquake wave.The analysis included the displacement and acceleration of the supporting slope as well as the time history responses of the axial forces of soil nails and anchors.In the establishment of finite element model,the interaction between soil body and supporting structure was considered.An elastic-plastic M-C model with nonlinear static and dynamic behavior was used to simulate the soil body and a dual linear strengthening model was adopted to simulate the supporting structure.Then the interaction between soil body and supporting structure was simulated with contact element.The results showed that the supporting structure with composite soil nailing slope had better anti-seismic performance than the supporting structure with general soil nailing slope.The maximum horizontal displacement of the latter occurred at the slope top,but that of the former occurred at the slope upper middle.Especially after the imposition of the prestress,the slope displacement under earthquake would reduce significantly,and the axial forces of soil nails and anchors under earthquake would increase significantly.Moreover,the axial forces of soil nails and anchors would reach their maximum values near the slipping surface.The displacement and the acceleration of slope increased with the slope height.
引文
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[2]RAMAKRISHNAN S,BUDHU M,BRITTO A.Laboratoryseismic tests on geotextile wrap-faced and geotextile-rein-forced segmental retaining walls[J].Geosynthetics Interna-tional,Industrial Fabrics Assoc Int,1998,5(1):55-71.
[3]董建华,朱彦鹏.地震作用下土钉支护高速公路边坡动力参数分析[J].西安建筑科技大学学报:自然科学版,2007,39(5):661-666.
[4]董建华,朱彦鹏.土钉土体系统动力模型的建立及地震响应分析[J].力学学报,2009,41(2):236-242.
[5]董建华,朱彦鹏.地震作用下土钉支护边坡稳定性分析[J].中国公路学报,2008,21(6):20-25.
[6]董建华,朱彦鹏.地震作用下土钉支护边坡动力分析[J].重庆建筑大学学报,2008,30(6):90-95.
[7]钱家欢,殷宗泽.土工原理与计算[M].2版.北京:中国水利水电出版社,1996.
[8]HIS J P,SMALL C.Si mulation of excavationin an elastic-plas-tic material and analysis method[J].Geomech,1992,16(1):123-134.
[9]中华人民共和国建设部.GB 50330-2002建筑边坡工程技术规范[J].北京:中国建筑工业出版社,2002.
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