基于改进变权物元可拓模型的围岩稳定性评价

Evaluation of Surrounding Rock Stability Based on Improved Matter-element Extension Model with Variable Weight

为克服现有一些围岩稳定性评价方法的局限性和不足之处,建立一个基于改进变权物元可拓评价模型。该模型对最大隶属度原则进行了改进,首先用贴近度代替关联度,然后用等级变量特征值对指标进行等级评定,并采用变权理论确定指标权重,最后对指标进行敏感性分析。结果表明:样本1、样本2、样本3、样本5属于Ⅱ级(较稳定),样本4属于Ⅰ级(稳定);通过与既有方法比较分析,证明该评价方法与实际情况具有较强的贴近度;单轴抗压强度和地下水渗水量是影响该围岩稳定性综合评价结果的敏感性指标。

In order to overcome the limitations and deficiencies of the existing surrounding rock stability evaluation methods, an evaluation model based on improved variable weight matter-element extension, was built. The maximum membership degree principle was improved, with progress instead of correlation, replacing rank variable characteristic value to grade assessment, and it used variable weights theory to de- termine the index weight, and analyzed the sensitivity finally. Through theoretical analysis and calcula- tion, the results show that sample 1, sample 2, sample 3 and sample 5 belong to level II （relatively sta- ble）, sample 4 belongs to level I （stable）. Compared with those evaluation results given by other meth- ods, the evaluation result given by this method is more consistent with actual situation. The analysis results show that single shaft compressive strength and groundwater percolating capacities are indicators affecting evaluation result of surrounding rock stability.