Research on layout and pressure relief control of roadway with residual coal pillar mining face
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摘要: 针对历史遗留保护煤柱和边角煤等遗煤资源复采时，应力环境复杂、围岩条件恶劣，回采巷道受地压影响显著、布置困难、安全性差等难题，以山西潞安王庄煤矿52采区残留煤柱工作面回收为研究背景，基于残采工作面周围采空区分布形态差异，将残采工作面边界分为规则采空区边界、混合采空区组合边界和不规则采空区边界等3类。采用数值模拟方法揭示了残采工作面应力分布特征：①对于规则采空区边界，应力呈对称马鞍形分布；②对于混合采空区组合边界，区段煤柱边缘应力卸载，应力向混合采空区组合边界中部转移，导致该区域应力集中程度高，影响范围扩大；③对于不规则采空区边界，采空区拐角区域叠加应力使得煤体破坏，集中应力向拐角深部区域转移，该区域垂直于残采工作面走向方向上，应力集中系数2.2，平行于残采工作面走向方向上，拐角两侧均存在应力集中区，应力集中系数均为2.0。在此基础上，提出了残采工作面巷道布置原则：巷道必须避开采空区边界的应力叠加区和采空区拐角的拉剪破坏区，确定了残采工作面巷道布置方式，得到了5个典型的煤柱宽度：d1=5 m，d2=20 m，d3=30 m，d4=20 m和d5=5 m；据此，将残采工作面巷道分成3个区段：原岩应力掘巷、沿空掘巷和高应力掘巷，建立了残采工作面巷道“3-5-3”分区控制体系，并重点针对高应力掘巷开发了钻孔卸压技术，设计了巷道围岩分区控制参数，开展了工业性试验。监测数据表明回采巷道能够满足残采工作面回收要求。Abstract: During the extraction of historical coal pillars and corner coal,there are some difficulties associated with the complex stress environment,severe surrounding rock condition,mining roadway significantly affected by the ground pressure,difficult layout and poor safety. Based on the background of the residual coal pillar mining face at the 52 mining area in Wangzhuang coal mine of Shanxi Lu'an group,the boundary of the residual mining face was divided into three categories as a regular gob boundary,a mixed gob boundary and an irregular gob boundary according to the distribution pattern of the mined area around the residual mining face. The stress distribution characteristics of the residual mining surface were revealed with the numerical simulation method as follows:①for the regular goaf boundary,the stress is symmetrically saddle-shaped; ②for the mixed gob boundary,the section coal pillar edge stress is unloaded,and the stress is transferred to the middle of the combined boundary of the mixed gob area leading to a high degree of stress concentration in the area and an increase in the scope of influence; ③for the irregular goaf area boundary,the coal is destroyed by the superposed stress in the corner area of the goaf area,and the concentrated stress is transferred to the deep corner area. The stress concentration factor with both sides of corner area perpendicular to the strike direction of the residual face is 2.2,and the two stress concentration factors with corner area parallel to the strike direction of the residual mining face are both 2.0. On the basis of the above observations,the layout principle of the roadway in the residual mining face was proposed that the roadway layout should avoid the stress superimposed zone at the boundary of the mining area and the tensile-shear failure area at the corner of the mining zone. The layout of the roadway in the mining face was determined with five typical coal pillar width,i.e., d1=5 m, d2=20 m, d3=30 m, d4=20 m,and d5=5 m. Therefore,the roadway of the residual mining face was divided into three sections:original rock stress driving,gob side driving and high stress driving,the "3-5-3" zoning control system for the roadway in the residual mining face was established,the drilling pressure relief technology focused on the high-stress roadway was developed,the control parameters of the surrounding rock of the roadway was designed,and the industrial test was carried out. The monitoring data showed that the mining roadway can meet the requirements for the recovery of the residual mining face,which might provide a reference for the layout and control of the roadway in Lu'an and other mining areas.
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期刊类型引用(19)
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