摘要
基于声发射(Aoustic Eission,AE)的物理相似模拟实验,对采空区覆岩局部化损伤、变形及演化特征进行了分析.在不同的开采扰动下,采空区围岩介质受扰动剧烈程度不同,其初始损伤与破裂AE密集程度也不同,其特征参数大事件、总事件和能率随时间-空间演化呈波动趋势,并存在一定的统计关系;同时定义了损伤程度百分比,并将其分为4个阶段进行了分析,尤其是在Stage-4阶段,损伤程度百分比最大值达到83.3%,表明围岩损伤剧烈.
In terms of the principle of the AE - based rock-mass damage, the localized damage or deformation characteristics was analyzed to the overburden rocks in mined out area under. The results show that the initial damage degree of media is obviously different in various mining rate and disturbance ranges. The characteristics parameters, large events, total events and energy rates are obviously variable and abide to common statistical relationship between the temporal and spatial variation. Consequently, the quantitative parameter for damage degree characterization, was proposed. Especially, at the Stage -4 mining, the maximal value reaches to 83.3 %, it indicates that the surrounding rocks damage seriously.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2008年第4期382-386,共5页
Journal of China Coal Society
基金
国家自然科学基金资助项目(10402033,10772144)
陕西省重点实验室基金资助项目(04JS19)
关键词
采空区
局部化损伤与变形
声发射
mined-out-area
localized damage and deformation
acoustic emission （AE）
