基于理论计算和工程类比的大断面煤巷支护设计

Support Design of Big Sectional Coal Roadway Based on Theoretical Calculations and Engineering Analogy

针对煤矿大断面回采巷道的薄层状顶、底板条件和受构造及采动影响较大的情况,分别采用悬吊理论、自然平衡拱理论、组合梁理论、加固拱理论分析计算,采用工程类比法分析,明确了支护重点为巷道顶板,并得出了巷道锚杆支护参数。对支护参数的对比分析和应用实践表明,组合梁理论对巷道支护设计的指导性较差,采用其他3种支护理论和工程类比相结合的方法可以较好地指导大断面煤巷的支护设计。

For big sectional coal mine roadway with lamellar roof and floor conditions, and at the same r time under the influence of geological structure and mining, suspension theory, natural balance arch theory, composite beam theory, reinforced arch theory was respectively used for analysis and calculation, and engineering analogy method was used for analysis, all of these methods cleared the support focus of roadway roof and obtained roadway bolting parameters. Comparative analysis showed that composite beam theory lead a poor guidance, the other three theories and engineering analogy together can get better guidance for supporting design of big sectional coal roadway.