| 瓦斯煤层裸露面蠕变失稳的时间预测研究 |
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| 引用本文： | 鲜学福,李晓红,姜德义,姜永东.瓦斯煤层裸露面蠕变失稳的时间预测研究[J].岩土力学,2005,26(6):841-844. |
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| 作者姓名： | 鲜学福 李晓红 姜德义 姜永东 |
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| 作者单位： | 重庆大学,西南资源开发及环境灾害控制工程教育部重点实验室,重庆,400030 |
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| 基金项目： | 国家自然科学基金重点资助项目(50334060)，重庆市院士基金资助项目(6592) |
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| 摘 要： | 通过对煤体蠕变特性的分析,提出采用五元粘弹塑流变模型能很好地描述煤体的蠕变特征。在考虑煤层瓦斯的作用下,得到了含瓦斯的煤蠕变状态方程。由于揭开的煤层裸露面由原来的三向受力变为二向受力,在合适的条件下煤体会产生蠕变。而煤体在双向受压时,裸露面方向的应变为拉应变,当裸露面方向的煤体的拉应变大于煤体破坏时的拉应变时,煤体将产生蠕变失稳。从而可以预测煤体蠕变失稳的时间。研究成果可以解释揭煤工程岩体失稳。
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| 关 键 词： | 煤层裸露面 蠕变模型 蠕变失稳时间 |
| 文章编号： | 1000-7598-(2005)06-0841-04 |
| 收稿时间： | 2005-03-08 |
| 修稿时间： | 2005年3月8日 |
Research on prediction of creep collapsing time for uncovering gas coal plane |
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| XIAN Xue-fu,LI Xiao-hong,JIANG De-yi,JIANG Yong-dong.Research on prediction of creep collapsing time for uncovering gas coal plane[J].Rock and Soil Mechanics,2005,26(6):841-844. |
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| Authors: | XIAN Xue-fu LI Xiao-hong JIANG De-yi JIANG Yong-dong |
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| Institution: | Key Laboratory for the Exploitation of Southwestern Resources & the Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400030, China |
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| Abstract: | Through the analysis of coal creeping feature, the paper proved that quintic rheological model with adhesiveness, elasticity and plasticity functions well in describing the creeping. On consideration of the power of coal gas, it was figured out the state law of the creeping of coal with gas. It is found that creeping occurs to coal in certain situation because the stress on uncovering coal plane has changed from three-dimensional stress to dichroic. If coal is two-way stressed, the strain on the direction of uncovering plane is tension strain; and this tension strain of the coal on the uncovering plane excesses that level of coal breaking up, the creep collapsing happens. With this method, it can be predicted the time of creep collapsing on uncovering coal plane. The method can also explain the mechanics of rock collapsing in engineering by this way. |
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| Keywords: | uncovering coal plane creeping model creep collapsing time |
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