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采用大型有限元软件ADINA对复合土钉支护边坡进行地震响应分析.地震波输入选用常用的EL-Centro波,分析内容包括支护边坡位移、加速度、土钉、锚杆的轴力时程响应.在建立有限元模型时,考虑土体和支护结构相互作用;应用非线性静动力性能的弹塑性M-C模型模拟土体;采用双线形强化模型模拟支护结构;土与支护结构相互作用由接触单元模拟.结果表明复合土钉边坡支护结构比纯土钉边坡支护结构有更好的抗震性能;普通土钉支护最大水平位移发生在边坡顶部,而复合型土钉支护发生在边坡的中上部,尤其是在施加了预应力之后,边坡在地震作用下位移明显减小;土钉和锚杆轴力在地震作用下放大显著,在滑移面附近轴力最大;位移和加速度沿着坡高逐渐增大.
Seismic response analysis of composite soil nailing slope is carried out by using large-scale finite element software ADINA. Commonly used EL-Centro waves are selected for seismic wave input. The analysis contents include slope displacement, acceleration, soil nailing, Response. When establishing the finite element model, the interaction between soil and support structure is considered. The elasto-plastic MC model with nonlinear static and dynamic properties is used to simulate soil. The bilinear reinforced model is used to simulate the support structure. The results show that the composite soil nailing slope support structure has better seismic performance than the pure soil nailing slope support structure. The maximum horizontal displacement of ordinary soil nailing support occurs at the top of the slope, while the complex type Soil nailing occurred in the middle and upper part of the slope, especially after the prestress was applied, the displacement of the slope decreased obviously under the action of earthquake. The axial force of soil nailing and anchor rod enlarged significantly under the action of earthquake. The maximum axial force nearby; displacement and acceleration gradually increase along the slope height.