Boundary friction mechanism of reinforced soil and reasonable design method of reinforced cut slope

为了研究钢网钢筋与地面之间的受力和边界摩擦机理，在试验结果和数值模拟的基础上，提出了合理的钢筋边坡设计方法。主要结论总结如下：1。通过钢格栅配筋的拉拔试验，研究了格栅配筋墙体的受力机理，并对纵向和横向作用在钢筋上的力进行了计算。研究发现，纵筋的轴向力在横筋位置发生显著变化，纵横筋的直径和表面条件对承载和边界摩擦机制也有影响。为研究覆盖层压力和碾压压实对初弯钢筋的影响，进行了带初弯钢筋的拉拔试验。结果表明，在初始弯曲约5cm时，与无初始弯曲钢格栅加固相比，其拉拔阻力提高了10%。对某实际路堑边坡进行了综合稳定性分析，验证了该设计方法的适用性。并以实际路堑边坡为例，提出了合理的根桩加固设计方法。

To investigate both mechanisms of bearing and boundary friction between steel-grid reinforcement and ground, the authours proposed a reasonable design method of reinforced slope, being based on experimental results and numerical simulations. The main conclusions are summerized as follows :1. The pullout tests of steel-grid reinforcement were carried out to investigate the bearing mechanism of gridreinforced wall, and the forces acting on longitudinal and transverse steel bars were evaluated. It was found that axial force of longitudinal bars significantly changed at location of transverse bars, and also that the diameters and surface conditions of longitudinal and transverse steel bars affected bearing and boundary friction mechanism.2.The pullout tests of steel-grid reinforcement with initial bend were carried out to investigate the effect of initial bend induced by overburden pressure or rolling compaction. It was found that the about 5 cm initial bend made 10% increase of the pullout resistance comparing with that of steel-grid reinforcement without initial bend.3.The authors applied hybrid slope stability analysis for a real cut slope, and examined the applicability of this design method. The authors also proposed a reasonable design method of real cut slope reinforced by rootpiles as a example.