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首先介绍了块体理论的基本原理和裂隙岩体结构面随机统计分析方法,并对遗传算法提出了改进措施。进而结合3座隧道围岩的裂隙结构面特征参数值统计,运用关键块体理论和赤平投影解析法,模拟和分析了3组典型节理结构面下隧道在不同走向时关键块体的位置、大小及稳定性发生的变化,并与实际调查情况进行了对比分析,最后运用改进的遗传算法编程,推算出节理结构面在特征区间内隧道轴线的最优走向。研究结果表明,借助关键块体理论及改进的遗传算法进行隧道轴线走向的优化是经济可行的。
Firstly, the basic principle of block theory and the stochastic statistical analysis method of structural plane of fractured rock mass are introduced, and the improvement measures are given for the genetic algorithm. Based on the statistics of the characteristic parameters of the fractured face of the surrounding rock of the three tunnels, the key block theory and stereographic projection method were used to simulate and analyze the location, size and location of the key blocks in the three groups of typical joints And the changes of the stability, and compared with the actual investigation. Finally, using the improved genetic algorithm programming, the optimal direction of the tunnel axis in the feature interval of the joint structure plane is deduced. The results show that it is economically feasible to optimize the tunnel axis direction by means of the key block theory and the improved genetic algorithm.