矿业安全与环保
礦業安全與環保
광업안전여배보
MINING SAFETY & ENVIRONMENTAL PROTECTION
2015年
1期
9-12
,共4页
塑性煤%脆性煤%破坏%声发射%演化特征
塑性煤%脆性煤%破壞%聲髮射%縯化特徵
소성매%취성매%파배%성발사%연화특정
plastic coal%brittle coal%failure%acoustic emission%evolution characteristics
在单轴压缩条件下，进行了塑性煤与脆性煤试件破坏过程声发射监测试验，研究两类煤破坏过程的声发射演化特征。试验结果表明：煤体破坏失稳过程中的声发射与煤体中的裂纹萌生、扩展、贯通等活动相对应，煤体的声发射演化特征与其破坏特征密切相关。塑性煤破坏过程的声发射事件率呈现“上升—峰值—下降”的演化规律；声发射事件率出现急速增大之后的稳步下降是煤体主破裂面即将贯通、煤体破坏失稳的前兆。脆性煤破坏过程的声发射事件率呈现“上升—峰值”的演化规律，声发射“下降”段不明显。研究结果可为煤体稳定性监测的声发射参数演化的解译、灾变判识准则的建立提供理论基础。
在單軸壓縮條件下，進行瞭塑性煤與脆性煤試件破壞過程聲髮射鑑測試驗，研究兩類煤破壞過程的聲髮射縯化特徵。試驗結果錶明：煤體破壞失穩過程中的聲髮射與煤體中的裂紋萌生、擴展、貫通等活動相對應，煤體的聲髮射縯化特徵與其破壞特徵密切相關。塑性煤破壞過程的聲髮射事件率呈現“上升—峰值—下降”的縯化規律；聲髮射事件率齣現急速增大之後的穩步下降是煤體主破裂麵即將貫通、煤體破壞失穩的前兆。脆性煤破壞過程的聲髮射事件率呈現“上升—峰值”的縯化規律，聲髮射“下降”段不明顯。研究結果可為煤體穩定性鑑測的聲髮射參數縯化的解譯、災變判識準則的建立提供理論基礎。
재단축압축조건하，진행료소성매여취성매시건파배과정성발사감측시험，연구량류매파배과정적성발사연화특정。시험결과표명：매체파배실은과정중적성발사여매체중적렬문맹생、확전、관통등활동상대응，매체적성발사연화특정여기파배특정밀절상관。소성매파배과정적성발사사건솔정현“상승—봉치—하강”적연화규률；성발사사건솔출현급속증대지후적은보하강시매체주파렬면즉장관통、매체파배실은적전조。취성매파배과정적성발사사건솔정현“상승—봉치”적연화규률，성발사“하강”단불명현。연구결과가위매체은정성감측적성발사삼수연화적해역、재변판식준칙적건립제공이론기출。
Under the condition of uniaxial compression, monitoring test of acoustic emission was carried out in the failure process of both plastic and brittle coal specimen and study was made on the evolution characteristics of acoustic emission in their failure process. The test results showed that the acoustic emission in the failure and destabilizing process of coal corresponded with the process of crack initiation,extension and interconnection in the coal,and the evolution characteristics of acoustic emission of coal were closely related to its failure characteristics. The acoustic emission event rate in the failure process of the plastic coal presented an evolution regularity of “up-peak-down”;the steady decrease of the acoustic emission event rate after its rapid increase was the precursor of the main fracture surface connection and the failure and destabilization of coal. The acoustic emission event rate of the brittle coal presented an evolution regularity of “up-peak” and the “down” stage of acoustic emission was not obvious. The study results can provide a theoretical basis for the explanations of the acoustic emission parameter evolution in coal stability monitoring and the establishment of identification criteria for catastrophe.
