缓倾顺层岩质边坡中抗滑键的承载性能及破坏模式研究

Research on Load-bearing Performance and Failure Mode of Anti-sliding Bonds in Gently Dipping Bedding Rock Slopes

为揭示抗滑键在含软弱夹层缓倾顺层岩质边坡中的承载性能与破坏模式,基于有限元软件,考虑抗滑键为塑性损伤模型,开展分级荷载下抗滑键加固含软弱夹层边坡三维数值模型试验,研究抗滑键工作时的变形特性、应力分布特征及损伤过程,并讨论抗滑键承载性能的优化措施。结果表明,抗滑键工作时以受剪为主,当混凝土等级和配筋率一定时,其极限承载力受控于自身截面面积;不同长径比抗滑键破坏模式有所不同,当长径比为4,2.67时,抗滑键在滑面处被剪断,当长径比为2,1.33时,抗滑键被推倒;针对抗滑键被剪断时的情况,其承载能力大小主要取决于混凝土等级。

In order to reveal the load-bearing performance and failure mode of anti-sliding key in gently inclined bedding rock slopes with weak interlayers,based on finite element software,considering the anti-sliding key as a plastic damage model,the reinforcement of anti-sliding key under graded thrust load was carried out.The three-dimensional numerical model test of the weak sand wich slope is carried out to study the deformation characteristics,stress distribution characteristics and damage process of the anti-sliding key during working,and discuss the optimization measures for the bearing performance of the anti-sliding key.The results show that the anti-sliding key is mainly subjected to shear during working,and when the concrete grade and reinforcement ratio are constant,its ultimate bearing capacity is controlled by its own cross-sectional area.The failure modes of the anti-sliding key are different with different aspect ratios.When the aspect ratio is 4 and 2.67,the anti-slip key is cut off at the sliding surface.When the aspect ratio is 2 and 1.33,the anti-slip key is pushed down.For the case of cutting off of the anti-slip key,its bearing capacity is mainly depends on the concrete grade.The research results can be used as the supplement of the support and protection measures and the load-bearing performance of anti-sliding keys for gently sloping bedding rock slopes with weak interlayers.