坡间路基挡土墙稳定性评价数值模拟及建设方案确定

NUMERICAL SIMULATION OF STABILITY ASSESSMENT AND DESIGN-MAKING OF A SUBGRADE RETAINING WALL ON SLOPE

坡间路基挡土墙一般建设在半填半挖路段,近年来相继发生了多次不同规模的坡间路基挡土墙失稳灾害,结合栖莱高速公路K59+470～K59+630半填半挖段路基建设问题,为将不安全因素消除在萌芽状态,在对坡间挡土墙失稳原因分析的基础上,采用快速拉格朗日数值模拟方法,对产生坡间挡土墙失稳的主要因素——边坡角及车辆动荷载进行全面探讨,提出坡间挡土墙“双锚”建设方案,并根据分析结果确定具体的工程措施及主要技术参数,“双锚”建设方案实施后监测结果表明,边坡及挡土墙处于完全稳定状态,因此,该技术方案对于类似坡间挡土墙建设具有广泛的推广和应用价值。

Usually, the retaining wall on the slope is constructed in the section of the half-filling and half-excavating subgrade. Nevertheless many failure cases of this type of retaining wall have been reported in recent years. Combined with a practical subgrade construction project of retaining wall in one section （K59＋470 - K59＋630） of Qixia-Laixi expressway of Shandong Province. First, a Lagrange numerical simulation is taken to analyze two main failure factors（slope angle and dynamic vehicle load） of the retaining wall on the slope; then, a double anchor constructing plan of the retaining wall is proposed; finally the concrete engineering technical parameters and method are obtained by comparison. The monitoring results indicate the stability of the retaining wall and the slope, and the success of the project means the double anchor constructing technique is feasible and applicable for similar engineering project.