采矿与安全工程学报2025，Vol.42Issue(5)：1064-1075,12.DOI:10.13545/j.cnki.jmse.2024.0225
浅埋临空下工作面开采强矿压显现诱因及支护载荷研究
Study on strong mining pressure manifestation cause and support load of shallow-buried working face under goaf
摘要
Abstract
Similar experiments were performed to simulate the movement characteristics of overburden during the mining of the 31114 working face.Moreover,based on the key stratum"voussoir beam"structure theory,this study also analyzed causes of strong mining pressure manifestation,delineated are-as with strong mining pressure manifestation,and calculated the reasonable support load of hydraulic support.It was found that the key stratum in the main roof and the interlayer key stratum in the overbur-den above the working face undergo periodic fracturing and caving,resulting in large and small periodic weightings.When the working face advances by 80 cm and 152 cm,the subsidence displacements of un-coded points on measuring lines 8 and 11 in the overburden near the open-off cut and the working face increase abruptly,and the subsidence displacement curve of uncoded points on the measuring line near the open-off cut is of a greater slope.In the meantime,the mining pressure manifestation is particularly intense,and the bearing stress of hydraulic support surges to a peak value of 4.35 MPa.The step dis-tances of large and small periodic weightings during mining beneath solid coal of the working face are approximately 30 cm and 15 cm,respectively,both being slightly greater than those during mining be-neath the overlying goaf(25 cm and 12 cm).In the case of large periodic weighting,which is relatively moderate,the bearing stress of hydraulic support is 3.65 MPa.Besides,a mechanical model and an in-stability criterion about the"voussoir beam group"structure formed by critical rock blocks resulting from key stratum breakage in the overburden were established.It is identified that the"voussoir beam"struc-ture resulting from key stratum breakage in the main roof experiences rotational deformation instability,while that resulting from interlayer key stratum breakage in the overburden undergoes either shear-slip in-stability or rotational deformation instability.As the equivalent mining thickness increases,the"voussoir beam group"structure resulting from key stratum breakage becomes unstable synchronously,and the growing caving distance of the overburden induces overall step-like subsidence and intense mine pressure manifestation.In addition,the areas extending 60 cm before and 12 cm after the working face passes through the overlying goaf are determined to be areas with intense mine pressure manifestation.The cal-culation reveals that when the support load of hydraulic support is not less than 17,319.58 kN,the"voussoir beam group"structure resulting from key stratum breakage lags behind the working face insta-bility and collapse.In this case,intense mining pressure manifestation occurs in the goaf,which effec-tively alleviates pressure on the working face.This study offers an important theoretical reference for controlling strong mining pressure manifestation in shallow-buried closely spaced coal seam mining.关键词
浅埋近距离煤层/强矿压显现/"砌体梁"结构/失稳判据/支护载荷Key words
shallow-buried closely spaced coal seams/strong mining pressure manifestation/"voussoir beam"structure/instability criterion/support load分类
矿业与冶金引用本文复制引用
汪北方,蒋嘉祺,张学朋,张晶..浅埋临空下工作面开采强矿压显现诱因及支护载荷研究[J].采矿与安全工程学报,2025,42(5):1064-1075,12.基金项目
国家自然科学基金项目(52374092) （52374092）
鄂尔多斯市青年科技人才支持项目(RC20250114) （RC20250114）
辽宁省"兴辽英才计划"青年拔尖人才计划项目(XLYC2403101) （XLYC2403101）
辽宁省教育厅基本科研项目(LJ212410147086) （LJ212410147086）
煤炭开采水资源保护与利用全国重点实验室开放基金项目(WPUKFJJ2022-03) （WPUKFJJ2022-03）
山东科技大学山东省矿山灾害预防控制重点实验室开放课题基金项目(SMDPC202303) （SMDPC202303）
