地震作用下新疆喀什高台民居基于变形控制的土遗址边坡加固设计研究

Reinforcement design of the earthen site slope for rural houses in the high loess slope of Kashgar,Xinjiang,under earthquake based on deformation control

为验证地震作用下格构式锚杆挡墙加固土遗址边坡的有效性,以新疆喀什高台民居土遗址边坡现有加固段为研究对象,利用有限元软件Midas/GTX NX建立三维动力分析模型,对地震作用下格构式锚杆挡墙加固土遗址边坡的变形控制进行研究分析。结果表明:地震作用下土遗址边坡在坡顶与坡脚处产生严重的位移变形,且随着地震持时增加呈现累加效果;土遗址边坡加固后能有效控制水平方向与垂直方向的位移变形,最大位移变形值满足控制要求;土遗址边坡加固后地震作用下的稳定性系数提高至1.54,满足规范要求值1.15。研究成果验证了格构式锚杆挡墙加固土遗址边坡能够有效控制位移变形,并提高稳定性。

To verify the effectiveness of strengthening the earthen site slope under earthquake,we considered the existing reinforced section of the earthen site slope in the high loess slope of Kashgar,Xinjiang,as the research object.A three-dimensional dynamic analysis model was established using the finite-element software Midas/GTX NX,and analysis was performed on the deformation control of the earthen site slope reinforced by lattice anchor retaining wall under earthquake.Results indicate the severe displacement and deformation at the top and foot of the slope,the cumulative effect of the increase in earthquake duration.The displacement and deformation in the horizontal and vertical directions were effectively controlled after reinforcement,and the maximum deformation value met the requirements of control.The stability coefficient of the earthen site slope under earthquake reached 1.54 after reinforcement,which meets the requirement value of 1.15 in the code.The research demonstrates that the lattice anchor retaining wall can effectively control the displacement and deformation of the earthen site slope,thus improving slope stability.