回采巷道锚杆支护效果评判的改进突变级数法

为综合确定多种因素影响下回采巷道的锚杆支护效果,提出评判回采巷道锚杆支护效果的改进突变级数法。首先,多层次分解影响巷道锚杆支护效果的因素,根据离差最大化法改进突变级数法中的指标重要性排序问题;然后,构建基于改进突变级数法的锚杆支护效果评判模型,计算得出巷道锚杆支护效果评判级数;最后,对20个样本进行巷道锚杆支护效果评判及实例验证,确定模型的可行性和可靠性。结果表明:样本数据的模型检验预测结果与现场巷道锚杆支护稳定性结果一致;改进支护方案后,巷道稳定性由第Ⅲ级变为第Ⅱ级,与现场监测位移结果相符,可验证改进突变级数法的合理性和可靠性。

Improved catastrophe progression method for evaluating supporting effect of bolts in mining roadway

In order to determine comprehensively bolt support effect of mining roadway under influence of various factors,an improved catastrophe progression method was proposed to evaluate supporting effect of bolts in mining roadway. Firstly,based on multi-layer decomposition of factors affecting roadway bolt support effect,index importance ranking problem in catastrophe progression method was improved by dispersion maximization method. Then,evaluation model of bolt support effect based on improved mutation progression method was constructed,and evaluation series of roadway bolt support effect was calculated.Finally,feasibility and reliability of model were confirmed by evaluating effect of roadway bolt support on 20 samples and verifying by numerical simulation. The results show that improved catastrophe progression method considers relative importance of each index. Evaluation results are accurate,which provides a new method for evaluation of bolt support effect.