加筋土坡的可能滑移模式和基于库仑理论的稳定分析方法

加筋土坡因其填方量少、工期短、经济安全等优势在国内外已得到广泛应用，故其稳定性分析也显得尤为重要。目前，已有多位学者将极限分析上 限定理运用于加筋土坡的稳定性分析中，并假定水平条块速度间断面。然而在其分析过程中，构造的速度场并不符合位移协调条件。提出了由于筋材的隔断 作用形成的斜向界面破坏模式，并计算相应速度场式，分别提出主动、库仑、被动三种滑移模式。通过计算比较发现，在加筋间距较密时，库仑模式总是相 应安全系数最小的控制工况。实际工作中，可以只使用这一概念清晰、计算简便的方法分析加筋土坡的稳定性。为方便工程设计快速获取安全系数或筋材间 距，将土坡各参数进行无量纲化，绘制了安全系数图，并与Michalowski设计图表进行对比，验证了该算法的有效性。且针对多个实际工程算例进行验算， 验证了库仑模式上限法的可行性。

Investigation on possible failure modes of geotextile reinforced slopes and stability analysis methods based on Coulomb theory

 Geotextiles have found wide applications in slope reinforcement engineering due to the advantages of reducing embankment volume, shortening construction period, and economy and safety. The stability analysis methods for slopes with geotextile reinforcement have attracted much attention. Among them, the upper bound method in limit analysis has been applied. In the existing methods, however, the defined velocity field may not be in accordance with the deformation compatibility condition. In this study, three possible failure patterns, namely active, Coulomb and passive slippage mode, were investigated based on different slip surfaces and the inclined slice interfaces. It was found that with dense reinforcement spacing, the Coulomb mode employing a straight slip surface may always lead to the smallest factor of safety. In practical applications, the simple and clearly-defined method can be solely used for the stability analysis of geotextile reinforced slopes. To be convenient for engineering design and to rapidly achieve the factor of safety and reinforcement spacing, the parameters of soil slopes were nondimensionalized. The stability charts were developed and compared with the Michalowski design charts, and consequently the effectiveness of the present method was validated. Based on several practical projects in China, the feasibility of the proposed upper bound method with Coulomb mode was verified.