摘要
采用理论分析和数值模拟研究了不同倾角煤层开采的空间结构特征,通过计算煤层倾角分别为0°、30°、45°和60°时垮落带、裂隙带最大高度,得出不同倾角煤层开采的围岩破坏和裂隙发育状况。结果表明:随煤层倾角增大,矿压显现特征明显位置靠近煤层倾向方向的上部,非对称"壳体结构"的整体破碎范围变小、局部破碎程度加剧,破坏形态由单一的倾斜砌体结构破坏演变为伴有反倾斜砌体结构的综合破坏,垮落带和裂隙带的范围变小,最大高度降低;数值模拟和理论分析对应模型的"两带"最大高度偏差率为1.5%～7.6%。
A theoretical analysis and numerical simulation were applied to study the space structure features of the mining in different in- clined seams.With the calculation on the max heights of the falling zone and crack zone during the mining in seam with different inclina- tions of 0°, 30°, 45° and 60°, the surrounding rock failure and crack development status of the mining in dif/brent inclined seams were ob- tained.The results showed that with the seam inclination increased, the obvious location of the mine pressure behaviors would be close to the top of the seam inclination direction, the integrated broken scope of the asymmetric ＂shell structure＂ would be reduced and the broken degree in some area would be more serious.The failure formation was evolved from a failure of a single inclined liner structure to a compre- hensive failure of reversed inclined liner structure, the scopes of the failing zone and the crack zone were reduced and the max height was reduced.The max height error of the numerical simulation and the theoretical analysis corresponding to ＂the two zones＂ of the model was 1.5%-7.6%.
出处
《煤炭科学技术》
CAS
北大核心
2013年第3期51-54,共4页
Coal Science and Technology
关键词
煤层倾角
采动裂隙
垮落带高度
裂隙带高度
壳体结构
砌体结构
seam inclination
mining cracks
height of falling zone height
crack zone height
shell structure
lining structure
