摘要
就工作面宽度与关键层位置判别的关系以及基于薄板模型的关键层判别方法存在的局限性进行了研究。结果表明:一般情况下,各硬岩层的破断顺序是由各硬岩层步距准数所决定的,与工作面宽度无关,因此无论是采用梁模型还是薄板模型对关键层位置的判别结果没有影响;上覆硬岩层几何尺寸并不一定能符合薄板的定义,而且基于薄板模型的关键层判别方法需要工作面宽度才能进行计算,如果工作面宽度小于上覆硬岩层的步距准数,硬岩层将稳定不破断,就无法得到硬岩层的破断距,也就无法通过比较硬岩层破断顺序来确定关键层位置。
The limitations of key stratum distinguishing method based on the thin slab theory and the relationship be- tween the width of working face and the key stratum distinguish were analyzed. The result shows that the breaking or- der of hard strata is decided by the span criterion of hard strata and it is not relate to the width of working face in gen- eral case. So using the thin slab model or clamped-clamped beam model has no effect to the distinguishing results of the key stratum. The geometry size of hard strata is not always accord with the definition of the thin slab model. And the key stratum distinguishing method based on the thin slab theory should consider the width of working face. If the width of working face is less than the span criterion of the overlying hard strata, hard strata will not break, the interval of roofing breaking of hard strata can not be obtained, the position of key stratum can not be determined by comparing the interval of roofing breaking of hard strata.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第2期194-197,共4页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)基金资助项目(2007CB209400)
教育部"新世纪优秀人才支持计划"资助项目(NCET-05-0478)
国家自然科学基金重点资助项目(50834005)
国家自然科学基金资助项目(50974116)
关键词
薄板模型
关键层
判别方法
工作面宽度
梁模型
thin slab model
key stratum
distinguishing method
the width of working face
clamped-clamped beam model
