多水平老旧密闭墙加固与有害气体防治技术研究

Research on multi-level reinforcement of old airtight walls and harmful gas prevention technology

针对四老沟矿通风系统由压入式改为抽出式后面临的多水平老旧密闭墙内有害气体外溢问题,根据四老沟矿多水平密闭墙结构特点,采用数值模拟方法研究了抽出式通风条件下不同厚度密闭墙内有害气体外溢浓度变化规律,提出了模拟分析—远端封闭—充填治理—围岩漏风通道封堵的老旧密闭墙全方位治理关键技术。实践表明,通过治理增强了密闭墙在矿压时空作用下的结构稳定性和密封性,防止了通风方法改变后多水平密闭墙内有害气体外溢事故的发生,保障了矿井的安全生产,可为今后类似条件下的老旧密闭墙治理提供参考。

Aiming at the problem of harmful gas spilling in the multi-level old enclosed wall after the ventilation system of Silaogou Mine was changed from the press-in type to the extraction type,based on the structural characteristics of the multi-level enclosed wall in Silaogou Mine,numerical simulation methods were used to study the extraction type.Under the condition of ventilation,the harmful gas spillover concentration changes in the enclosed walls of different thicknesses,and the key technology for comprehensive treatment of the old enclosed walls of simulation analysis-remote sealing-filling treatment-wall rock leakage channel plugging was proposed.Practice had shown that through treatment,the structural stability and tightness of the enclosed wall under the action of mineral pressure and time and space had been enhanced,and the occurrence of harmful gas spillage accidents in the multi-level enclosed wall after the ventilation method had been changed was prevented,and the safe production of the mine was guaranteed.In the future,it would provide a reference for the treatment of old closed walls under similar conditions.