CAJ | 학술논문

为提高保护层开采的有效性、安全性和经济性,通过引入理想弹脆塑性模型和内切圆准则,采用FLAC3D技术,在德鲁克-普拉格塑性流动格式基础上建立采动煤岩体弹脆塑性损伤本构模型的数值格式.利用VC++2005开发环境将本构模型编写成可供FLAC3D软件调用的自定义模型,并通过试件单轴和三轴压缩数值试验的对比,验证模型用于研究采动煤岩体脆性应变软化特征的正确性和合理性.将所建立模型用于阳泉新景矿超远距离保护层开采的数值模拟得出:位于保护层上部125 m的超远距离被保护煤层处于裂隙带上边缘,被保护层卸压瓦斯取得良好效果,能利用保护层开采及被保护层卸压瓦斯抽采消除被保护层的突出危险.计算结果与物理相似模拟结果基本吻合,表明所建立的采动煤岩体弹脆塑性损伤本构模型可用于保护层开采及被保护层卸压瓦斯抽采效果的预评价.模拟结果可为保护层开采及被保护层卸压瓦斯抽采设计提供合理建议.
위제고보호층개채적유효성、안전성화경제성,통과인입이상탄취소성모형화내절원준칙,채용FLAC3D기술,재덕로극-보랍격소성류동격식기출상건립채동매암체탄취소성손상본구모형적수치격식.이용VC++2005개발배경장본구모형편사성가공FLAC3D연건조용적자정의모형,병통과시건단축화삼축압축수치시험적대비,험증모형용우연구채동매암체취성응변연화특정적정학성화합이성.장소건립모형용우양천신경광초원거리보호층개채적수치모의득출:위우보호층상부125 m적초원거리피보호매층처우렬극대상변연,피보호층사압와사취득량호효과,능이용보호층개채급피보호층사압와사추채소제피보호층적돌출위험.계산결과여물리상사모의결과기본문합,표명소건립적채동매암체탄취소성손상본구모형가용우보호층개채급피보호층사압와사추채효과적예평개.모의결과가위보호층개채급피보호층사압와사추채설계제공합리건의.
The exploitation of the protective layer and pressure-relief gas drainage is an effective primary method to eliminate coal and gas outburst and it is widely used in many mineral fields. In order to improve the effectiveness,safety and economy of the protective layer mining,a set of numerical equations of elasto-brittle- plastic constitutive model of coal rock mass damage due to mining are set up based on the plastic flow format of Drucker-Prager constitutive model in fast Lagrangian analysis of Continua in 3-dimension continua(FLAC3D). And the model is modified by using the inscribed circle criterion and the ideal brittle-plastic model. The model is developed into DLL file in VC++2005 programming environment for FLAC3D;and the correctness and rationality of this model used to study the brittle strain-softening characteristics of coal rock mass due to mining are validated by comparing with uniaxial and triaxial compression numerical tests. This model is used to simulate the super-remote protected seams exploitation of Xinjing coal mine in Yangquan coal field. The results show that the protected layer lies in the top edge of fractured zone 125 m away from the protected layer;and the relieved gas in the super-remote protected layers could be better drained utilizing the mining influence of the protective layer. And the conclusions agree with that of the similar experiment,which indicates that the elasto-brittle-plastic constitutive model of coal rock mass damage due to mining could be used to preliminary evaluation of protective layer mining and relief-pressure gas drainage. Simulation results may bring forward reasonable suggestions for the design of protective layer mining and relief-pressure gas drainage.