框架锚杆加固黄土边坡模型试验研究

Model Test Study on Reinforcement of Loess Slope with Frame Anchor

框架锚杆支护对提高边坡稳定性和减小边坡变形的作用效果显著.参照某实际工程,通过室内模型试验,研究了不同锚固角和不同压实度对锚杆锚固作用的影响;对未加固的、腰梁锚固和框架锚杆锚固的黄土边坡进行试验,对比分析不同坡顶荷载作用下坡体的位移及边坡的极限承载力变化规律.结果表明:锚杆的抗拔力随布锚角度的增加,呈现出先增大后减小的趋势,当锚杆俯斜40°布置时,抗拔力达到最大,即40°是最优锚固角;单根腰梁情况下,腰梁处于坡高1/2时承载力最大且侧向位移最小;全坡框架锚杆支护承载力最大,其在减小沉降和限制侧向位移的效果更为显著.

The effect of frame bolt support on improving slope stability and reducing slope deformation is remarkable, in this paper, the influence of different anchoring angle and different compaction on anchoring action of anchor rod is studied through indoor model test with reference to a practical project. The loess slope, which is unreinforced, bolted by waist beam and anchored by frame bolt, is tested, and the displacement and ultimate bearing capacity of slope under different top loads are compared and analyzed. The results show that the pull-out force of the bolt increases first and then decreases with the increase of the anchor angle. When the anchor is inclined to 40°, the anti-pulling force reaches the maximum, that is, 40° is the optimal anchoring angle. In the case of a single waist beam, the bearing capacity is the largest and the lateral displacement is the smallest when the waist beam is at 1/2 of the slope height, and the bearing capacity of the whole slope frame bolting is the largest, which is more effective in reducing the settlement and limiting the lateral displacement.