采矿与岩层控制工程学报2024，Vol.6Issue(6)：126-140,15.DOI:10.13532/j.jmsce.cn10-1638/td.2024-1155
深部高瓦斯强动压巷道切顶卸压机制及技术研究
Study on mechanism and technology of roof cutting and pressure relief in deep roadway with strong dynamic pressure and high gas
摘要
Abstract
Deep gob-side roadways are subjected to the dual challenges of strong dynamic pressure and high gas content.To address the severe deformation of deep gob-side roadways,the 13131 roadway was used as a case study.Theoretical analysis,numerical simulation,and field testing were employed to study the movement characteristics of overlying strata on the gob side,the deformation mechanism of the surrounding rock,and the technical parameters for roof cutting and pressure relief.The results show that 6.0 m siltstone layer acts as a sub-key layer within the overlying strata.The fracture of arc-shaped triangular blocks triggers the collective movement of thick and hard strata,resulting in increased overburden load,an expanded influence range of side abutment pressure,and severe deformation of the gob-side roadway.The effectiveness of roof cutting and pressure relief depends heavily on the roof cutting height and angle.Effective reduction of roadway deformation is achieved only when the roof cutting height reaches the top of the key stratum;beyond this height,the improvement becomes negligible.At a roof cutting angle of 0°,the transmitted side abutment pressure is minimal.As the roof cutting angle of from 0° to 10°,the deformation of the gob-side roadway shows a slight increase.However,when the angle increases from 10° to 20°,the deformation increases significantly.Based on the key technical parameters of roof cutting and the spatial distribution of gas drainage boreholes,a blasting roof cutting scheme was proposed.This scheme incorporates an advanced safety distance,a protective distance for drainage boreholes,differentiated sealing lengths,and gas monitoring with safety assurance.Field tests demonstrated that this approach effectively controlled roadway deformation while maintaining gas drainage efficiency in roof boreholes.关键词
深部巷道/围岩控制/覆岩运动/切顶卸压/瓦斯抽采Key words
deep roadway/surrounding rock control/overburden movement/roof cutting and pressure relief/gas drainage分类
矿业与冶金引用本文复制引用
肖同强,任勇辉,神文龙,贾义雪,许磊,刘发义,代晓亮..深部高瓦斯强动压巷道切顶卸压机制及技术研究[J].采矿与岩层控制工程学报,2024,6(6):126-140,15.基金项目
国家自然科学基金资助项目(52274077) （52274077）
河南省自然科学基金资助项目(242300421072) （242300421072）
深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放基金资助项目(SJF2213) （SJF2213）
