| 煤层预裂爆破准静态应力场特性分析 |
| |
| 引用本文： | 肖力,王志亮.煤层预裂爆破准静态应力场特性分析[J].煤炭科学技术,2011,39(3):40-43. |
| |
| 作者姓名： | 肖力 王志亮 |
| |
| 作者单位： | 1. 煤炭信息研究院煤炭工业出版社,北京,100029
2. 华北科技学院培训处,北京,101601 |
| |
| 摘 要： | 为了分析预裂爆破后煤体内准静态应力场的分布规律,基于弹性力学叠加理论、圆孔应力集中和厚壁筒原理,对爆腔周围煤体的径向应力、切向应力和剪应力分布特性进行分析。结果表明:在爆腔壁上,径向应力和剪应力为定值,切向应力与位置有关,裂隙扩展首先沿水平方向开始;在煤体内,切向应力在方位角θ=0方向上始终为拉应力,在距爆腔中心的距离r=槡10a(a为爆腔半径)存在最小值;在θ=π/4和θ=π/2方向上,切向应力变化趋势相同,均由压应力逐渐变为拉应力;剪应力只发生在θ=π/4方向上,在爆腔孔壁处,其值为0;在r=槡3a处,剪应力达到最大值-4σ2/3(σ2为围岩水平应力),随后逐步趋于减小;在无穷远处,剪应力变为围岩的水平应力。预裂爆破后煤体内的应力分布特性,可为优化煤层瓦斯抽放设计提供理论参考依据。
|
| 关 键 词： | 预裂爆破 准静态应力场 分布特性 爆腔 裂隙扩展 瓦斯抽放 |
Analysis on Para-Static Stress Field Features of Pre-Cracking Blasting in Seam |
| |
| XIAO Li,WANG Zhi-liang.Analysis on Para-Static Stress Field Features of Pre-Cracking Blasting in Seam[J].Coal Science and Technology,2011,39(3):40-43. |
| |
| Authors: | XIAO Li WANG Zhi-liang |
| |
| Affiliation: | XIAO Li1,WANG Zhi-liang2(1.Coal Industrial Publishing House,China Coal Information Institute,Beijing 100029,China,2.Training Division,North China Institute of Science and Technology,Beijing 101601,China) |
| |
| Abstract: | In order to analyze the distribution law of the para-static stress field in the seam after the pre-cracking blasting,based on the elasticity mechanics superposition theory,the borehole stress concentration and thick wall barrel principle,the paper had an analysis on the radial stress,tangential stress and shear stress distribution features of the surrounding coal mass along the blasting chamber.The results showed that the radial stress and shear stress in the blasting chamber wall would be a fixed value,the... |
| |
| Keywords: | pre-cracking blasting para-static stress field distribution features blasting chamber fractured expansion gas drainage |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
