摘要
煤层的冲击矿压危险性与煤岩体的结构特征关系非常密切.研究顶板-煤体-底板所构成的组合煤岩体试样变形破裂规律及冲击倾向性对于预测冲击矿压具有非常重要的实践意义.通过对组合煤岩的试验研究,得到组合煤岩试样中顶板强度越大,强度越强;组合煤岩试样的弹性模量随着煤样百分比的增加而减小.组合煤岩试样的冲击能指数随着顶板与煤样高度比值的增加而增加;冲击能指数随着煤样百分比的增加而降低;弹性能指数随着煤样百分比的增加而呈现增加的趋势.组合煤岩试样中顶板岩样厚度越厚,冲击倾向性相应就越强;组合煤岩试样中煤层厚度越大,则其弹性能指数就越大.
The coal rock burst is closely related with the structure of coal rock strata, it is necessary to research into the burst failure and rock burst tendency of combined sample which is made up of roof, coal and floor. The experimental results show that the larger the roof strength is, the stronger the sample is. With the increase of the coal percentage, its elastic modulus decreases. The index of burst energy of the combined sample increases with the increase of height ratio of roof to coal; and it decreases while the ration of coal and overall sample increases. Its elastic energy index increases with the increase of percentage of coal. The thicker the combined sample is, the stronger the rock burst tendency is. Meanwhile the thicker the coal in the combined sample is, the greater the elastic energy index is.
出处
《采矿与安全工程学报》
EI
北大核心
2006年第1期43-46,共4页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(50474068
50490273
50074030)
国家重点基础研究"973"项目(2005CB221504)
教育部博士点基金项目(20030290017)
关键词
冲击矿压
组合煤岩样
冲击倾向性
冲击能指数
弹性能指数
rock burst
coal-rock combinations sample
rock burst tendency
burst energy in- dex
elastic energy index
