倒Y型挡土墙结构的抗滑稳定性

Stability of inverted Y type retaining wall against sliding

【目的】研究倒Y型挡土墙结构的稳定性,为填土范围较小、施工空间有限、地基开挖难度较大区域倒Y型挡土墙的设计提供参考。【方法】基于非线性有限元法,对倒Y型挡土墙结构的设计参数进行对比分析,确定其最优值。【结果】对比计算结果表明,倒Y型挡土墙墙趾板长度每增加0.5m其安全系数可提高3.5%,墙趾板与铅垂线夹角每增加10°其安全系数可提高2.73%,墙踵板长度每增加0.5m其安全系数可提高4.35%;倒Y型挡土墙的安全系数随着墙踵板与铅垂线夹角的增大而呈现出先增大后减小的趋势。【结论】倒Y型挡土墙墙趾板与铅垂线夹角为90°、墙踵板与铅垂线夹角45°时,挡土墙的稳定性最高。挡土墙的稳定性随墙趾板、墙踵板长度的增加而提高,但墙趾板、墙踵板的具体长度应根据具体地质条件及稳定性要求计算确定。传统悬臂式挡土墙也可视为倒Y型挡土墙的一个特例。

【Objective】The stability of inverted Y type retaining wall was studied to provide reference for the design of inverted Y type retaining wall in areas with small filling range,limited construction space,and having difficulty in foundation excavation.【Method】Based on shear strength reduction finite element method,the stability of inverted Y type retaining wall with different parameters was analyzed to determine the optimal design value.【Result】The stability of inverted Y type retaining wall on average increased by3.5% when the length of the toe wall plate increased by 0.5m,the stability increased by 2.73% when the angle between the toe wall plate and the plumb line increased 10°,and the stability increased by 4.35%when the length of the heel wall plate increased 0.5m.While the stability of inverted Y type retaining wall increased first and decreased later with the increase of the angle between the heel wall plate and the plumb line.【Conclusion】When the angle between the toe wall plate and the plumb line valued 90°and the angle between the heel wall plate and the plumb line valued 45°,the stability of retaining wall obtained its maximal value.The stability of retaining wall enhanced when the length of the toe wall plate or the length of the heel wall plate increased,but the specific length of the toe wall plate or the heel wall plate should be calculated and determined according to the geological conditions and stability requirement.The traditional cantilever retaining wall could be treated as a special case of inverted Y type retaining wall.