水泥土墙复合土钉墙的协同作用机理数值模拟

为进一步明确复合式支护结构间的协同作用机理,以水泥土墙复合土钉墙为研究对象,运用FLAC^3D有限差分软件建立三维模型.在分析工程实例基本作用规律的基础上,以水泥土墙水平位移为衡量指标,利用墙钉比进行数值模拟分析.结果表明:改变墙宽,当墙钉比为7.00%～12.00%时,最大水平位移明显减少;在墙钉比不变的情况下,水泥土墙在基坑边缘时,约束水平位移最为明显,后移影响土钉轴力的发挥;改变土钉倾角,当墙钉比为8.90%～9.20%时,位移明显减少,最大水平位移最小.因此,当墙钉比为8.00%～9.50%时,支护结构受力合理,协同作用效果最好.

Numerical Simulation on Cooperative Action of Composite SoilNailing Wall With Cement Soil Wall

In order to study the cooperative action between composite retaining structures, the composite soil nailing wall with cement soil wall was analyzed. Based on the analysis of the basic action of the engineering, the 3D model was established by the FLAC^3D finite difference software. Taking the horizontal displacement of cement soil wall as index, the wall-nail ratio was adopted to numerically study cooperative action. The results show that: for the change of wall width and 7.00%-12.00% of wall nail ratio, the maximum horizontal displacement is obviously reduced; for the constant wall nail ratio, the horizontal displacement of the cement soil wall at the edge of the foundation pit is the most obviously reduced, the backward movement affects the exertion of the axial force of the soil nail; for the change of soil nail inclination angle and 8.90%-9.20% of the wall nail ratio, the displacement is reduced significantly, and the maximum horizontal displacement is the smallest. Therefore, 8.00%-9.50% of the ratio of wall nails is recommended, with reasonable stress state of support structure and best cooperative action.