Test study on the top cracking process of large coal sample

被引：0
|
作者：
Jin, ZM [1 ]
Wei, JP [1 ]
Song, XM [1 ]
Xue, YD [1 ]
Niu, YH [1 ]
机构：
[1] Taiyuan Univ Sci & Engn, Taiyuan, Peoples R China
来源：
MINING SCIENCE AND TECHNOLOGY 99 | 1999年
关键词：
D O I：
暂无
中图分类号：
TD [矿业工程];
学科分类号：
0819 ;
摘要：
In this paper, the pressing crack effect of the top coal under the abutment pressure in Xhizhouyao Mine is simulated. The characteristics of strength and deformation of top coal are analyzed. It is found out there are six evolution stages during the process of pressing crack of top coal, that are crack compressing, density increasing, expanding, hardening, failure, softening. The changing regularities of pressing crack and lump diameter are given by method of the fractal dimension. According to the damage mechanics theory, the constitutive equations of the top coal pressing crack is obtained. This paper provides scientific foundations for the technical parameter selection and numeral analysis of the lonwall top-coal caving technology.
引用
收藏
页码：405 / 408
页数：4
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