边坡土钉支护动力有限元分析

为了研究边坡土钉支护在地震作用下的动力特性和工作性能,运用大型有限元软件ADINA,对支护结构建立了整体三维有限元计算模型,并进行了动力有限元模拟分析,研究内容包括水平地震作用下支护结构的土钉轴力响应、位移响应、加速度响应.计算结果表明:(1)地震使每排土钉轴力增大,且每根土钉轴力最大处增幅明显;(2)地震没有改变边坡潜在滑移面的位置;(3)地震作用下,坡顶的水平峰值位移和峰值加速度最大,说明坡顶附近土层的地震响应最激烈,所受的地震力也最大,较容易发生破坏.这些结论可为边坡土钉支护的抗震设计提供参考.

Dynamic FEM Analysis of a Slope Protected by a Soil Nailing Retaining Wall

In order to study dynamic characteristicsand working performance of a slope protected by a soil nailing retaining wall under earthquake,a whole three-dimensional finite element calculation model was established by using large-scale finite element software ADNIA. The soil nailing retaining wall was analyzed on the basis of the dynamic finite element method. Research contents included soil nailing axial force,horizontal displacement of a slope,horizontal acceleration of a slope under horizontal earthquake. The calculation results showed that:( 1) Axial forces of every row soil nailing increase after an earthquake and increase greatly in the position of the maximum axial force;( 2) The location of potential slip surface is not changed after an earthquake;( 3) Horizontal peak displacements and horizontal peak accelerations of a slope are biggest at the top under earthquake,and this showed that the seismic response is the most obvious,the seismic action is the most biggest at the top,and the upper structure is more likely to be damaged. These conclusions can provide some valuable references for seismic design in soil nailing engineering.