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基于主动支护方式的思想,从提高弱面本身抗剪性能的观点出发,对顺层岩质边坡采用了弱面注浆加固的治理方法。通过对比试验,分析了岩块试样在注浆前后抗剪性能的变化,结果表明注浆后,弱面峰值前平均剪切刚度Kss和粘结力c有较大的提高,而摩擦角的提高幅度较小。针对边坡坡角α大于弱面倾角β的情况,在假设不稳定岩体沿弱面滑动的基础上,推导了滑坡的临界长度,从而确定有效注浆范围。最后,由FLAC3D数值模拟,分析注浆前后整个边坡应力场的变化,说明注浆加固能够使应力在边坡岩体中得到均化,避免应力集中现象的发生。
Based on the idea of active support mode, from the viewpoint of improving the shear resistance of weak face itself, a weak face grouting reinforcement method is adopted for the bedding rock slope. The results show that the average front shear strength Kss and the cohesion c of the weak face increase significantly after grouting, while the friction angle The improvement is smaller. Aiming at the condition that the slope angle α is greater than the weak slope β, the critical length of the landslide is deduced on the assumption that the unstable rock slides along the weak plane, so as to determine the effective grouting range. Finally, the FLAC3D numerical simulation is used to analyze the stress field changes of the whole slope before and after grouting, which shows that the grouting reinforcement can make the stress be homogenized in the slope rock mass and avoid the stress concentration.