摘要
在工作面上位岩层移动实测、模拟实验及工作面矿压观测的基础上,对大采高综采工作面上覆岩体破断位置及其平衡结构进行了研究.结果表明:大采高综采工作面基本顶断裂的位置在工作面前方、上覆岩层存在着比分层开采层位更高但和放顶煤开采相似的平衡结构,结构的活动是一个逐渐变化的过程,在这一过程中,平衡结构与其下的直接顶相互作用,这种作用方式与直接顶的多次损伤有关;传递到支架的载荷主要取决于支架上方直接顶的岩性和损伤的程度.平衡岩梁的变形对支架产生的影响受直接顶的岩性和其损伤后的强度的影响是明显的.
Based on the site measure data of upper rock layer and the showing characteristics of ground pressure (around in) large cutting height workface, the broking position and balance structure of the main roof were studied.The results indicate that the broking position of the main roof is in front of the coal face, there is a balance structure of upper rock layer in higher level compared with the layered extraction.The activity of the structure is a grade process, in which the balance structure and the immediate roof interact, and the activity way relates to the multi-damage of the immediate roof.The given deformation pressure on support is relevant to integral mechanical properties and the damage feature of the immediate roof. It is remarkable that the residual strength of damaged immediate rock influence on the load of support influenced by balance rock layer.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2004年第2期137-141,共5页
Journal of China Coal Society
关键词
大采高开采
平衡结构
力学模型
损伤
large cutting height workface
balance structure
mechanical model
damage feature
