In order to study the water-inrush disaster law of collapse column under the influence of interstitial material activation, a return air roadway of Shenhua Group was taken as the research object. The strength reduction and permeability mutation caused by rock destruction inside and outside collapse column and activation and loss of fillings were considered. FLAC3D simulation was used to study the characteristics of displacement, permeability coefficient, pore water pressure and water inflow of collapse column and surrounding rock in the process of roadway excavation. On this basis, the influence of fillings packed height of collapse column on water inrush was analyzed. The results show that: with the increase of the distance between roadway and collapse column fillings layer, the width and depth of the activated loss of collapse column fillings in the roadway floor will be larger and larger, resulting in the rock displacement between collapse column water-conducting layer and roadway bottom is increasing and the overall slip trend appears. Finally, when the roadway driving face exceeds 1 m of the collapse column central axis, the high-pressure water of the collapse column injects water into the roadway through the activation and loss channel of fillings. And the water inrush has the characteristics of large volume, suddenness and hysteresis. The larger the fillings packed height of collapse column is, the later the water inrush time node of collapse column relative to roadway excavation surface is. However, when the fillings packed height of collapse column reaches 22 m, water inrush will not occur in the collapse column.

Hydraulic fracturing roof pressure relief and coal pillar grouting are important means for stability control of surrounding rock in small coal pillar goaf excavation. Based on this, the FLAC numerical calculation model was established in the background of gob-side excavation of the return air roadway in Sanyuan Coal Mine, and the deformation law of the 4306 return air roadway was compared and analyzed under the three conditions of roof cutting and coal pillar grouting, no roof cutting and coal pillar grouting, no roof cutting and no coal pillar grouting with 5 m small coal pillars. The results show that: Compared with the scheme without top cutting and no grouting, the maximum movement of roof and floor, the maximum horizontal displacement of pillar wall and the maximum horizontal displacement of solid wall under the scheme of roof cutting and coal pillar grouting, no roof cutting and coal pillar grouting, no coal pillar grouting and roof cutting in 4306 return air roadway are reduced by 67%～83%, 17%～83% and 16%～17%, respectively. Roof cutting grouting can effectively ensure the stability of 4306 return air roadway, and the failure depths of the plastic zone of roadway roof, floor and solid wall are 3.0 m, 1.0 m and 3.0 m, respectively.

煤矿开采技术的进步降低了作业人员的劳动强度,提高了煤炭开采效率与质量,但煤矿安全事故仍时有发生,对作业人员的生命安全造成威胁.对多种煤矿开采技术进行了分析,并提出了煤矿安全生产管理策略,可供相关人员参考.

针对某煤层大断面巷道支护技术应用不当,造成部分巷道变形破坏等严重问题,通过数值模拟分析的方法建立起大断面数值模型,分析了顶板沉降、锚杆受力等多个关键因素,对相关支护方案参数进行了优化设计.优化后的支护方案使得围岩变形和大断面巷道应力场数值分布都有较大的提升,提高了巷道围岩的稳定性.