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为了探讨边坡锚固及锚杆荷载传递机理,利用双弹簧单元,通过FLAC3D建立数值计算模型,分析锚杆长度变化对边坡安全系数和滑动面的影响以及锚杆的力学响应。表明:①锚杆加固边坡时,存在一有效锚固长度;随着锚杆长度的增加,边坡潜在滑动面逐渐往坡内移动,破坏模式由浅层滑动变为深层滑动;当锚杆长度达到有效锚固长度时,边坡的滑动面位置发生突变;②各层锚杆轴力沿杆体不均匀分布;当边坡岩土体受到外界扰动而劣化时,边坡下部锚杆轴力值最大;因此,对于永久性锚杆支护边坡,应适当加长底层锚杆长度。
In order to discuss the mechanism of slope anchorage and bolt load transfer, a double-spring unit was used to establish a numerical model by FLAC3D. The influence of bolt length on slope safety coefficient and sliding surface and the mechanical response of bolt were analyzed. The results show that: (1) There is an effective anchorage length for anchor slope reinforcement; as the length of anchor increases, the potential slip surface of slope gradually moves into the slope, and the failure mode changes from shallow slide to deep slide. When the anchor length When the effective anchorage length is reached, the position of sliding surface of the slope changes abruptly. (2) The axial force of rock bolts in each layer is unevenly distributed along the shaft. When the slope rock and soil body is disturbed by the outside world and deteriorated, ; Therefore, for the permanent rock bolt supporting slope, the length of the bottom rock bolt should be lengthened properly.