摘要
针对因房式采空区煤柱留设情况复杂,煤柱底板应力传递相互叠加,周期来压异常,霍洛湾煤矿3-1煤层过上覆2-2煤层房式采空区强矿压及动压现象的问题,应用理论分析、数值计算、相似材料模拟等方法,建立了2-2煤层房式采空区复合煤柱底板传递规律模型,探讨了出煤柱时顶板覆岩结构,揭示了煤柱影响条件下3-1工作面"高应力-煤柱-覆岩运动"联合作用动压机理。研究结果表明:2-2煤层房式采空区大煤柱下的水平与垂直应力较高,达9.7～15.3 MPa;垂直应力影响深度为42～58 m,水平应力影响深度为10～23 m,剪应力波及范围25～50 m;当3-1煤层工作面在20 m或50 m宽煤柱下开采时,超前支承应力较大,应力集中系数高达4.44～5.00; 3-1煤层工作面出大煤柱时的动压现象是由上下煤层应力叠加、煤柱上方倒梯形岩柱失稳与顶板垮裂运动联合作用的结果,可指导霍洛湾矿3-1煤层安全开采。
According to the complicated condition of the coal pillars left in the room and pillar mining goaf,such as the stress transmission of the coal pillar floor was overlapped,the periodic weighting was abnormal as well as the strong mine rock pressure and dynamic pressure phenomenon when No. 3-1 seam in Huoluowan Mine was passed thought the overburden room and pillar mining goaf in No. 2-2 seam,a theoretical analysis,numerical calculation,similar material simulation and other methods were applied to establish a model of the floor stress transmission law for the complex coal pillar in the room and pillar mining goaf of No. 2-2 seam. The paper had a discussion on the roof overburden structure when the coal pillar was passed and the combined action dynamic pressure mechanism of the " high stress-coal pillar-overburden rock movement" in No. 3-1 coal mining face under the influence condition of the coal pillars was reveal. The study results showed that under the large coal pillars in the room and pillar mining goaf in No. 2-2 seam,the horizontal and vertical stresses were high and could research 9.7 ~ 15.3 MPa. The influence depth of the vertical stress was 42 ~ 58 m,the influence depth of the horizontal stress was 10 ~ 23 m and the shear stress affected scope was 25 ~ 50 m. When No. 3-1 coal mining face was mining under the coal pillars with a wide of 20 m or 50 m,the advance support stress would be high and the stress concentration coefficient would be 4.44 ~ 5.00.When the coal mining face in No. 3-1 seam passed through the above large coal pillars,the dynamic pressure phenomenon would be the stress superposition from the upper seam to the lower seam. The inverted trapezoid rock pillar instability above the coal pillar and the roof collapsed movement combined effect results could guide the safety mining of No. 3-1 seam in Huoluowan Mine.
作者
霍丙杰
范张磊
谢伟
段志华
路洋波
荆雪冬
HUO Bingjie;FAN Zhanglei;XIE Wei;DUAN Zhihua;LU Yangbo;JING Xuedong(School of Mining, Liaoning Technical University, Fuxin 123000, China;Shendong Tianlong Group Company Limited, Ordos 017000,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2019年第1期179-186,共8页
Coal Science and Technology
基金
国家自然科学基金资助项目(51504127)
关键词
浅埋煤层
房式采空区
应力场
超前支承应力
覆岩结构
shallow depth seam
goaf of room and pillar mining
stress environment
advanced support pressure
overburden structure
