岩石力学与工程学报
巖石力學與工程學報
암석역학여공정학보
CHINESE JOURNAL OF ROCK MECHANICS AND ENGINEERING
2014年
9期
1863-1872
,共10页
采矿工程%特厚煤层%巷道强矿压%双向压力%应力转移%水压致裂
採礦工程%特厚煤層%巷道彊礦壓%雙嚮壓力%應力轉移%水壓緻裂
채광공정%특후매층%항도강광압%쌍향압력%응력전이%수압치렬
mining engineering%extra-thick coal seam%roadway strong pressure%two-dimensional pressure%stress transfer%hydraulic fracturing
为保证大同矿区特厚煤层开采过程中临空巷道超前支护段的稳定性与可用性，采用理论分析与现场实测相结合的方法，得到巷道超前支护段的强矿压显现机制。研究表明：侏罗系煤层采空区区段煤柱应力集中影响区深度仅50～70 m，不足以影响石炭系工作面回采巷道的强矿压显现；石炭系工作面临空巷超前支护段的强矿压显现，主要受工作面采动超前支承压力及相邻工作面采空区悬顶的双向高支承压力的影响，且当工作面过上覆煤层采空区边界煤柱后，侏罗系煤层顶板大结构被重新激活，再次运动失稳，加剧了临空巷道的强矿压显现。提出并实施巷道顶板水压致裂有效控制技术，对同忻矿8105工作面5105临空巷实施定向高压水力致裂，实现巷道围岩高应力的转移，大大降低了临空巷超前支护段的强矿压显现强度，取得良好的临空巷卸压效果，保证了特厚煤层综放工作面的正常生产。
為保證大同礦區特厚煤層開採過程中臨空巷道超前支護段的穩定性與可用性，採用理論分析與現場實測相結閤的方法，得到巷道超前支護段的彊礦壓顯現機製。研究錶明：侏囉繫煤層採空區區段煤柱應力集中影響區深度僅50～70 m，不足以影響石炭繫工作麵迴採巷道的彊礦壓顯現；石炭繫工作麵臨空巷超前支護段的彊礦壓顯現，主要受工作麵採動超前支承壓力及相鄰工作麵採空區懸頂的雙嚮高支承壓力的影響，且噹工作麵過上覆煤層採空區邊界煤柱後，侏囉繫煤層頂闆大結構被重新激活，再次運動失穩，加劇瞭臨空巷道的彊礦壓顯現。提齣併實施巷道頂闆水壓緻裂有效控製技術，對同忻礦8105工作麵5105臨空巷實施定嚮高壓水力緻裂，實現巷道圍巖高應力的轉移，大大降低瞭臨空巷超前支護段的彊礦壓顯現彊度，取得良好的臨空巷卸壓效果，保證瞭特厚煤層綜放工作麵的正常生產。
위보증대동광구특후매층개채과정중림공항도초전지호단적은정성여가용성，채용이론분석여현장실측상결합적방법，득도항도초전지호단적강광압현현궤제。연구표명：주라계매층채공구구단매주응력집중영향구심도부50～70 m，불족이영향석탄계공작면회채항도적강광압현현；석탄계공작면림공항초전지호단적강광압현현，주요수공작면채동초전지승압력급상린공작면채공구현정적쌍향고지승압력적영향，차당공작면과상복매층채공구변계매주후，주라계매층정판대결구피중신격활，재차운동실은，가극료림공항도적강광압현현。제출병실시항도정판수압치렬유효공제기술，대동흔광8105공작면5105림공항실시정향고압수력치렬，실현항도위암고응력적전이，대대강저료림공항초전지호단적강광압현현강도，취득량호적림공항사압효과，보증료특후매층종방공작면적정상생산。
To ensure the stability and working of the advance supported roadway on gob side at the extra-thick seam zone during the mining process in Datong mine,a combined method of theoretical analysis and field measurement was used to obtain the pressure behavior of the forepoling segment of the roadway. The results of the research showed that the depths affected by the stress concentration zone of the coal pillar at mined-out section of Jurassic period were only 50-70 m,not deep enough to affect the occurrence of the strata pressure at the working face of the advance supported roadway in Carboniferous period. The occurrence of the strong strata pressure at the advance supported roadway in Carboniferous period was mainly affected by the abutment pressure due to mining and the high bearing pressure of overhang roof on two sides of the adjacent mined-out area. When the working front passed the boundary pillar of the mined-out area of the overlying coal,the big seam roof structure in Jurassic period was reactivated and tended to be unstable again,which speeded up the occurrence of the strong strata pressure of the roadway approaching the mined-out area. An effective control technology with the orientated high-pressure hydraulic fracturing of roadway roof was proposed and applied to the working front 8105 in the roadway 5105 approaching the mined-out area in Tongxin mine. The technology achieved the high stress transfer in the surrounding rock of roadway and greatly reduced the strong strata pressure of advance supported roadway approaching mined-out area.
