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针对资源整合矿井改扩建过程中面临大巷穿采空区时的围岩控制难题,提出在采空区顶板采用强力锚网喷支护系统和在采空区内采用钢筋混凝土-钢梁组合框架系统进行围岩控制与空间构建,并阐明裂隙发育区锚杆(索)控制与钢筋混凝土立柱减跨支撑的联合支护机理。研发的钢筋混凝土-钢梁组合框架系统是以H型钢筋混凝土立柱与纵梁以及顶板横钢梁组成的空间框架结构为主体,辅以经纬网、水泥板、缓冲材料、砖墙以及混凝土喷层等形成,具有立柱强支撑、顶板抗冲击、巷道隔绝空间构建等功能,并采用力学方法计算了立柱支撑前后顶板梁弯矩变化、立柱支撑能力以及立柱所受弯矩与支撑能力的关系。结合现场地质生产条件与工程经验,确定了大巷过采空区时锚网喷与组合框架联合支护方案与工艺流程以及相应安全技术措施,实践效果良好。
Aiming at the problem of surrounding rock control in the process of rebuilding and extending the resource integrated mine, it is proposed to adopt the strong anchor-net-spray supporting system in the roof of the goaf and the reinforced concrete-steel beam composite frame in the goaf The system conducts the surrounding rock control and space construction, and clarifies the joint support mechanism of bolt (cable) control and reinforced concrete column span support in the crack development area. R & D reinforced concrete - steel beam composite frame system is based on H-shaped reinforced concrete columns and vertical beams and roof beams consisting of horizontal steel frame structure as the main body, supplemented by the latitude and longitude network, cement board, cushioning materials, brick walls and concrete spray layer Etc., and has the functions of strong column support, roof impact resistance and isolation of roadway. The bending moment variation of the roof beam before and after the column support, the support capacity of the column and the bending moment and support capacity of the column are calculated by mechanics method. Combined with the on-site geologic production conditions and engineering experience, the scheme of joint support with anchor net spray and composite frame and the technical process and corresponding safety technical measures are determined when the gob area passes through the gob and the practical effect is good.