用简化的水平条分法分析加筋土挡墙的稳定性

Analysis on Stability of Reinforced Retaining Wall Using Simplified Horizontal Slice Method

针对筋材为可延展性材料的情况,采用简化水平条分法,推导出所需筋材拉力总和的计算公式和临界破坏角的方程式。计算公式考虑了水平和竖直地震力加速度系数、挡墙后填土的黏聚力和内摩擦角、地下水等因素,并且分析了这些因素对临界破裂角、所需筋材拉力总和或者所需筋材拉力总和系数的影响。结果表明,临界破裂角随着挡墙后填土黏聚力的增加或者内摩擦角的增大而增大,随着水平地震力加速度系数的增大而减小;竖向地震力加速度系数对临界破裂角和所需筋材拉力总和的影响与Ling&Leshchinsky的研究结果一致;所需筋材拉力总和系数随地下水位的升高或者孔隙水压力比的增大而增大,随内摩擦角的增大而减小。

Simplified horizontal slice method is adopted to deduce the formula for the required tensile force of reinforcement and the equation for the critical failure angle when the reinforcements are ductile materials. At the same time, the equations have also considered both horizontal and vertical seismic force, both cohesion and internal friction of fill for reinforced retaining wall, and groundwater et al., and furthermore, the effect of these factors upon the critical failure angles, required tensile force of reinforcement and coefficients for required tensile force of reinforcement is also considered. It is found that the critical failure angle increases with the increase of cohesion or internal friction of fill for reinforced retaining wall and reduces with the increase of horizontal seismic force, the influence of vertical seismic force versus critical failure angle and required tensile force of reinforcement is agreement with the results of Ling ＆ Leshchinsky, the coefficients for required tensile force of reinforcement increase with the increase of groundwater table or pore water pressure ratio and reduce with the increase of internal friction of fill for reinforced retaining wall.