基于有限变形理论的大采高综放煤壁塑性区宽度研究

Study on Width of Plastic Zone in Fully-mechanized Caving Mining with Large Height Based on Finite Deformation Theory

针对大采高综放面煤壁片帮控制难题,结合顶板岩梁弹塑性有限变形认识基础,综合现场调研、相似模拟、力学推导及算例分析等方法,得出顶板弹塑性有限变形约束条件下煤体垂直应力表达式,并采用直接配点法对煤壁前方塑性区宽度进行描绘。

Rib spalling in top-coal caving face with large mining height is a serious problem. Based on understanding of finite deformation theory,the method of site investigation,similarity simulation,mechanical derivation, and example analysis were used,the vertical stress under the given deformation constraints of elastic-plastic cantilever beam in front of the rib was obtained,and then the width of plastic zone was draw by the direct collocation method.