煤矿开采
煤礦開採
매광개채
COAL MINING TECHNOLOGY
2015年
4期
107-110
,共4页
坚硬顶煤%顶煤弱化%深孔爆破%炮孔间距
堅硬頂煤%頂煤弱化%深孔爆破%砲孔間距
견경정매%정매약화%심공폭파%포공간거
hard top-coal%top-coal weakening%deep hole blasting%blasting hole space
为了解决千树塔煤矿11301工作面顶煤硬度大、工作面回采期间顶煤不能及时垮落和充分破碎的问题，采用理论分析和数值模拟的方法研究了深孔爆破后炮孔周围的裂隙扩展情况和裂隙圈范围。结果表明，在炮孔直径为94mm、药卷直径75mm的条件下，千树塔煤矿的顶煤经爆破后炮孔周围的裂隙圈范围约为1.5m，最终确定合理的炮孔间距为3m。以此为依据设计了11301工作面的顶煤深孔爆破方案，实践后工作面顶煤采出率得以明显提高。
為瞭解決韆樹塔煤礦11301工作麵頂煤硬度大、工作麵迴採期間頂煤不能及時垮落和充分破碎的問題，採用理論分析和數值模擬的方法研究瞭深孔爆破後砲孔週圍的裂隙擴展情況和裂隙圈範圍。結果錶明，在砲孔直徑為94mm、藥捲直徑75mm的條件下，韆樹塔煤礦的頂煤經爆破後砲孔週圍的裂隙圈範圍約為1.5m，最終確定閤理的砲孔間距為3m。以此為依據設計瞭11301工作麵的頂煤深孔爆破方案，實踐後工作麵頂煤採齣率得以明顯提高。
위료해결천수탑매광11301공작면정매경도대、공작면회채기간정매불능급시과락화충분파쇄적문제，채용이론분석화수치모의적방법연구료심공폭파후포공주위적렬극확전정황화렬극권범위。결과표명，재포공직경위94mm、약권직경75mm적조건하，천수탑매광적정매경폭파후포공주위적렬극권범위약위1.5m，최종학정합리적포공간거위3m。이차위의거설계료11301공작면적정매심공폭파방안，실천후공작면정매채출솔득이명현제고。
In order to solve the top-coal caving difficult problem which result from large top-coal strength, theoretical analysis and nu-merical simulation was applied to obtaining cracks development and cracks circle range after deep hole blasting.Results showed that crack circle range of top-coal was about 1.5m after blasting with 94mm borehole diameter and 75mm cartridge diameter, and rational borehole space was obtained to be 3m.On the basis of this, top-coal deep hole blasting project of 11301 mining face was designed.Top-coal recovery had been obviously increased after application.
