土钉超前支护的有限元分析

土钉 超前锚杆支护形式在实际工程中应用日益广泛。为深入研究此复合土钉支护的工作机理,采用二维分离式有限元模型,由摩擦接触模拟土体与土钉和超前锚杆之间的接触。通过有限元计算,得出超前锚杆上受到的土压力情况以及土体水平位移的分布情况,将土拱理论应用于超前支护的工作分析,结合土拱形成的条件,说明了超前锚杆间形成土拱的可能性,并在此基础上分析了超前锚杆的作用机理,即超前锚杆间的土体形成的土拱有效地阻止了其后的土体位移。

Finite Element Analysis of Forepoling Bolts of Soil-nailed

At present the forpoling bolts of soil-nailed is widely used. To study the working principle of this kind of composite soil-nailed retaining wall, a discrete two-dimensional (2-D) finite element model is developed. The contact behaviors between nails or bolts and soil are simulated by friction contact. The displacement of unstable slope and soil pressure on the forepling bolts are calculated by the method. show Then soil-arching effect is inducted to discuss the working principle of the forepling bolts used in soil nailing retaining , which is the soil between of the forepling bolts forms soil arching to prvent the soil back of it effectively .