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针对高陡边坡的稳定性问题,以黄河玛尔挡水电站导流洞进口边坡中的随机块体为例,基于统计原理,采用三维极限平衡法对边坡岩体中的随机块体进行搜索,并对块体高度进行敏感性分析,得到块体在天然、暴雨和地震三种工况下的安全稳定系数,并对危险块体进行预应力锚索加固模拟,得到所需施加的锚固力。计算结果给出了导流洞进口边坡中可能存在块体的特征、规模及稳定性,以此提出危险块体加固建议,对实际工程的加固设计具有较大的参考价值。
Aiming at the stability of the steep slopes, taking the random block in the inlet slope of the diversion tunnel of the Yellow River Malbazid Hydropower Station as an example, based on the statistical principle, the random block in the slope rock mass is subjected to three-dimensional limit equilibrium method Search and analyze the sensitivity of the block height to get the safety and stability coefficients of the block in three conditions of natural, rainstorm and earthquake, and carry out the prestressed anchorage reinforcement simulation of the dangerous block to obtain the required anchorage force. The calculation results give the characteristics, scale and stability of the blocks that may exist in the inlet slope of the diversion tunnel. Based on this, the suggestions for strengthening the dangerous blocks are given, which is of great reference value to the reinforcement design of the actual project.