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通过FLAC3D建立边坡土钉加固模型,利用强度折减法分析边坡稳定性,研究土钉长度单调变化的布置形式对边坡安全系数及滑动面位置的影响,并建立滑动面和土钉位置的描述方程,得到:(1)当土钉的长度递减时,若土钉长度未穿过滑动面,改变土钉初始长度和变化幅度,边坡安全系数变化不大;(2)土钉加固土体的作用范围为滑动面附近一定范围,当土钉未穿过滑动面且沿其打入方向距离滑动面大于该范围时,加固效果不明显,土钉加固边坡能提高边坡安全系数,但需保证土钉端部与滑动面的距离控制在一定范围;(3)当土钉布置形式为长度递增型时,边坡安全系数显著提高,增加土钉布置在边坡下部的长度,可有效地提高边坡的安全系数,下部土钉的长度对边坡安全系数影响较大。
The slope soil nailing model was established by FLAC3D, the slope stability was analyzed by the strength reduction method, the influence of the monotonous variation of soil nail length on the safety factor of the slope and the position of the sliding surface was studied, and the location of the sliding surface and soil nail was established Describing the equation, we get: (1) When the length of soil nail decreases, if the length of soil nail does not pass through the sliding surface and change the initial length and change range of soil nail, the safety factor of slope has little change; (2) Soil nailing soil The scope of the body is a certain range near the sliding surface. When the soil nail does not pass through the sliding surface and the sliding surface is larger than this range along the driving direction, the reinforcement effect is not obvious. The soil nailing slope can increase the safety factor of the slope, However, it is necessary to ensure that the distance between the end of the soil nail and the sliding surface is controlled within a certain range. (3) When the length of the soil nail is increased, the safety factor of the slope is significantly increased, and the length of the soil nail arranged at the lower part of the slope is increased The safety factor of the slope is effectively increased. The length of the lower soil nail has a great influence on the safety factor of the slope.