摘要
通过相似材料模拟试验、力学分析、现场研究,指出坚硬顶板二次断裂是客观存在的,二次断裂位置决定了顶板与支护的稳定性。研究表明,二次断裂主要发生在煤壁处和切顶线处、也可能在煤壁前方,其决定于顶板厚度与悬顶距、支护阻力及煤体残余强度,通过改变支护阻力可以实现二次断裂位置的控制。
Similar material Simulation test, mechanical analysis and field study demonstrate the exsitence of the second fracturing of the hardroof. Its position depends on the stability of the roof and supports. Study shows that the second fracturing mainly happens right at the coal-face and roofcaving line, also may happen in the front of the working face, It depends on the thickness of the roof, the span of the roof cantilever,the resistance of the supports and the residual strength of the coal seam. The fracturing can be Controlled by changing the support resistance
出处
《山东矿业学院学报》
CAS
1990年第2期133-138,共6页
Journal of Shandong University of Science and Technology(Natural Science)
关键词
采场
顶板
断裂
采场支护
Hard roof
fracturing
working face supports
Control
simulation test
coal face
