基于模糊聚类方法的煤巷围岩稳定性分类研究

Study on stability classification of surrounding rock of coal gateway based on fuzzy clustering method

针对赵庄矿大断面煤巷围岩稳定性展开研究,采用模糊聚类法对赵庄矿3个盘区的15条巷道进行分类。选取巷道顶板强度σ_(c1)、巷道两帮围岩强度σ_(c2)、巷道底板围岩强度σ_(c3)、巷道埋深H、顶高比N、煤柱宽度X、最大水平主应力σ_h作为围岩稳定性分类的指标。根据现场调研数据获得判别矩阵,计算得到分类指标的权值分别为0.13、0.05、0.05、0.07、0.21、0.17、0.21。采用模糊聚类法分析,将选取煤巷分为6类最为合理,同类别煤巷围岩具有相似的稳定性,可采取相同或相似的支护手段来维护巷道。现场试验表明,模糊聚类方法对巷道的分类结果可有效指导煤巷围岩支护参数设计,保持巷道围岩变形量在可控范围内。

Aiming at the stability of surrounding rock of large section coal roadway in Zhaozhuang mine,the fuzzy clustering method is used to classify 15 roadways in 3 panels in Zhaozhuang Mine. Through the statistical analysis of the classification indicators,the strength of the roof,σ_(c1),the strength of ribs,σ_(c2),the strength of floor,σ_(c3),the depth of the roadway,H,the ratio of Roadway height and mining height,N,pillar width,X,the maximum horizontal principal stress σhwere selected as an indicator of rock stability classification. According to the field investigation data,the discernibility matrix is obtained,and the weight of the classification index calculated is respectively 0. 13,0. 05,0. 05,0. 07,0. 21,0. 17,0. 21. Using fuzzy clustering method to calculate and analyze,it is most reasonable to divide the selected coal roadway into six categories,and the surrounding rock of each category has similar stability. The same or similar support means can be adopted to maintain the same category roadway. Field tests show that the fuzzy clustering results of the classification of roadway can effectively guide the design of surrounding rock support parameters of the roadway to keep the surrounding rock deformation within the controllable range.