TIME-VARIATION STRUCTURE MODEL OF COAL BUMP INITIATION
At the present, coal bump research aims mostly at coal adjoining the laneway free surface but neglects the dynamic condition of laneway deep coal. It is based on the traditional static or dynamic theory in modelling with invariable boundaries systems. Actually, the stress state surrounding deep coal is dynamically changed with the excavation of working face or laneway, which may result in coal bump. This topic is rarely studied now. According to the representative characteristics of coal bump, the time-variation structure mechanics theory is applied to clarify the initiation mechanism of coal bump. Inherent parameters of coal self-sustaining bearing structures, such as load conditions, physics characteristics and boundaries, etc., are time-varying. The time-varying structure model is established and it can be further simplified to a mechanics model. The time-varying mechanics model indicates that the mass-decreased-with-timc coal structure can give negative damping which can cause dynamic instability and lead to coal bump. By using the finite element analysis in the software ANSYS, coal bump occurrence can be well simulated when coal is softened by decreasing its elastic modulus E and poisson ratio μ. The results can be helpful in explaining the mechanism of coal bump.
coal bump time-varying structure negative damping model
BIN WANG XI-BING LI ZHI-GUO LI
School of Resource and Engineering.Central South University Changsha 410083, P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
1297-1304
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）