包裹式土工格栅加筋土挡墙水平位移研究

Study on horizontal displacement of packaged geogrid reinforced soil retaining wall

包裹式土工格栅加筋土挡墙在工程中的设计分析仍采用基于极限平衡理论的锚固楔体法,而没有考虑在达到极限平衡之前加筋土挡墙所发生的变形发展和积累过程。加筋土挡墙面板的水平位移是墙体内外部稳定的重要体现。通过采用有限元数值方法,分析了不同工程因素对包裹式土工格栅加筋土挡墙面板处工后水平位移的影响,分析结果表明,FEM 计算值和实测值接近,说明了有限元计算分析的适用性;包裹式土工格栅加筋土挡墙面板处的工后水平位移呈由下向上增大趋势;拉筋刚度、长度、竖向间距对水平位移具有明显的影响并应选择适宜数值,以实现加筋士挡墙的良好工程性能;挡墙墙顶处外荷载大小及位置对水平位移具有相应影响,位于加筋区外的外荷载对墙面水平位移影响不明显。

In engineering,packaged geogrid reinforced soil retaining wall's design still use anchorage wedge method based on limiting equilibrium theory that doesn't consider the progress of retaining wall's deformation occurrence and accumulation before reach limitation.Retaining wall's horizontal displacement is an important appearance of its stability.By using FEM,the effect aroused by different engineering factors is analyzed.The analytical results show:results of FEM fit well with in-situ test and it proves the FEM results are reasonable;reinforced soil retaining wall's post-construction horizontal displacement enlarged from bottom to top geogrid's stiffness,length and vertical span have apparent effect for horizontal displacement,and should choose suitable design value to get desirable engineering behavior;the magnitude and location of outer load above retaining wall have corresponding effect for horizontal displacement that effect becomes unapparent when the outer load located besides the reinforced zone.