土工合成材料加筋土挡墙筋材内力分析

土工合成材料加筋土挡墙是一种新型的挡土结构，它具有经济性好、性能优越、适应性强等优点。而筋材内力计算是该类结构设计的一个关键步骤，因此该类结构的推广应用需要一种合理易用的内力分析方法。该文讨论了几种土工合成材料加筋土挡墙的筋材内力分析方法，并对这些方法的优缺点进行评述。这些方法包括基于主动土压力系数的方法、基于经验的K刚度法、基于极限平衡的加筋边坡稳定分析方法、基于非线性弹性与变形协调的理论方法、以及基于增量非线性及填土剪胀性的筋材内力分析方法等。通过比较分析发现，如忽略面板作用且填土强度得到完全发挥，基于主动土压力系数以及极限平衡边坡分析的方法适用于分析加筋土挡墙在强度极限状态时的筋材内力，但填土强度的发挥水平决定于筋材的长期刚度。另一方面，如能合理考虑筋材的长期刚度以及面板的约束作用，基于筋土变形协调的理论分析方法适用于分析加筋土挡墙在正常工作荷载作用下的筋材内力。

ANALYSIS METHODS FOR THE REINFORCEMENT LOADS OF GEOSYNTHETIC-REINFORCED SOIL RETAINING WALLS

Geosynthetic reinforced soil (GRS) retaining wall is a new type of earth retaining structure. It has the advantages of cost-effectiveness, good performance, and high adaptability, but its application is in need of a rational method to analyze the reinforcement load. Several methods for the analysis of the reinforcement load of GRS retaining walls are discussed, focusing on their applicabilities and limitations. These methods include the active earth pressure method, the K stiffness method, the limit equilibrium method based on slope stability analysis, the nonlinear elastic methods, and the incremental method considering soil dilatancy. It is found that the active earth pressure method and the limit equilibrium method may reasonably calculate the reinforcement load at the strength limit state, providing that the soil strength is fully mobilized, which in turn is dependent on the reinforcement stiffness. Under working stress condition, the analytical methods considering soil-reinforcement compatibility may accurately predict the reinforcement load, providing that the long-term reinforcement stiffness and the influence of facing are properly taken into account.