交通载荷下挡土墙的失稳分析

Instability Analysis of Retaining Walls under Random Vehicle Loading Condition

根据土体的动载特性,初步分析了土体在随机车辆动载荷下的移动规律,以及由此而引起的对公路挡土墙的破坏.根据土体和挡土墙的受力情况以及平衡条件,分别采用抗滑力分析和力矩分析方法建立起了在随机动载荷下重力式挡土墙——滑移体的系统极限平衡方程.为此类挡土墙的设计及失稳加固提供了一种简单可行的计算方法.利用此方法对实际工程事例进行了计算,并用计算机模拟技术对实际工程进行了比较系统的分析,结果表明此方法是可行的.

Under the random vehicle loading condition, according to the dynamic characteristics of soil, the active patterns of soil and the violation for retaining walls were analyzed in a rudimental procedure. Based on the Rankine active earth pressure theory and the limit equilibrium condition of retaining walls, three parameters were introduced into the program of instability analysis. Carrying the critical anti-sliding force and anti-sliding moment as analytical formulas, and taking into account the limit equilibrium condition of the wall-soil system, two equations were well established. A practical engineering was analyzed by this method and numeriacl analysis. The result shows that the angle of sliding wedge of subgrade soil are almost in the same value with different analytical measurements.