加筋土结构在高填筑边坡的作用机制研究

Study of the Action of Reinforced Soil Structure on High Fill Slope

加筋挡土墙在高大填筑边坡中的作用机制一直是国内外研究的重点。文章结合鲁甸6.5级地震灾后恢复重建水电铝项目的应用实例,采用数值模拟手段对加筋前后边坡的稳定性、拉筋的加固机制进行了研究。结果表明:加筋挡土墙在地震工况条件下可较好地限制边坡的水平、竖直位移,且加筋挡土墙的位移分布区较非加筋挡土墙大;加筋挡土墙较比非加筋挡土墙的塑性区范围明显减小,拉筋较好地提高了土体的抗剪强度;地震工况条件下,受地震扰动的影响,顶部、中部、底部拉筋较比天然工况呈现出不同的受力特征。

The mechanism of stiffened retaining wall in high fill slope has been the focus of research at home and abroad.Based on the reconstruction of the hydropower and aluminum project in Ludian,Yunnan Province,the restoration from a 6.5-magnitude earthquake,the slope stability before and after reinforcement and reinforcement mechanism of the tensile reinforcement are studied by numerical simulation.The results show that the reinforced retaining wall can limit horizontal and vertical displacements of the slope well in seismic conditions.In addition,the reinforced retaining wall has wider displacement distribution and far narrower plastic zone than the unreinforced one.The tensile reinforcement makes the soil more shear resistant.With seismic disturbance,stress characteristics of the top,middle and bottom tendons in earthquake condition is different from that in natural condition.