弹性模量对综放开采高韧性顶煤冒放性影响研究

Study on the Influence of Elastic Module to Fully-mechanized Caving the High-tenacity Top Coal

高韧性煤的弹性模量小、抗拉强度大,冒放性较差。通过理论分析,获得了高韧性煤层煤体在破坏前的挠度与弹性模量成反比,并得出顶煤挠度较大,顶板不能很好把支承压力传递给顶煤的结论。同时,通过数值模拟计算,表明了顶煤的弹性模量对其悬顶长度和应力有很大影响,高韧性顶煤悬顶长度大,应力小,不利于顶煤体的破坏。

The elastic modulus of high-tenacity coal is little and its strength of tensile is great, and collapse is very weak. Through the theoretic analysis, it achieved that the deflection was in inverse relationship to elastic modulus before the high-tenacity coal body being broken, and that the roof couldnt primly transmit purporting pressure to the top coal when the deflection was great. At the same time, through the numerical stimulation, it indicated the elastic modulus of the top coal played much influence on its length and stress. Length of high-tenacity coal is great; stress is little, which is not in favor of breaking the top coal.