摘要
在总结现场试验效果的基础上,应用断裂力学理论分析了急倾斜煤层巷道放顶煤顶煤破断裂纹的扩展和破碎机理。通过建立力学模型,探讨了急倾斜煤层放顶煤开采的影响因素,并得出了较为理想的开采条件是:煤层倾角为70°左右、厚度大于临界厚度且裂纹发育。该结论对推广这一采煤方法具有较大的现实意义。
On the basis of summarizing testing effects, the extension of crack and the breaking mechanism of top coal caving in steep seam have been analyzed by applying fracture mechanics theory. The factors influencing on the mining method have been discussed by constructing fracture mechanics models. The ideal mining conditions are the coal seal has an angle of 70.5°, the thickness exceeds threshold and developed crack has been obtained. The conclusion could be of practical significance in generalizing the mining method.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2002年第A02期2309-2313,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金(50174056)
关键词
断裂力学
急倾斜煤层
巷道放顶煤
顶煤破碎
裂隙扩展
板裂结构
fracture mechanics
steep coal seam
roadway sub-level caving
top coal break
extension of crack
layer-cracked structure
