论文部分内容阅读
为揭示钻孔注水过程中煤体位移的发展和分布规律,基于COMSOL Multiphysics 4.3b2D建立煤层注水三场耦合模型,模拟不同注水压力和时间作用下钻孔周围煤体径向位移的变化规律.研究结果表明:随着注水时间的延长或注水压力的升高,煤体的位移量增大;钻孔两侧出现两个以纵向为长轴的椭圆形较大位移区,呈现“哑铃形”非均匀分布;“哑铃形”两端椭圆形的中心是位移最大的区域,随注水过程的延续最大位移带向远离钻孔方向发展,椭圆的长短轴随注水时间的延续和压力的提高逐渐变大.
In order to reveal the development and distribution of coal displacement during drilling water injection, a three-coupling model of coal seam water injection was established based on COMSOL Multiphysics 4.3b2D to simulate the variation of coal body radial displacement under different water injection pressure and time. The results show that the displacement of coal body increases with the increase of water injection time or water injection pressure. Two large oval displacements with longitudinal axis appear on both sides of the borehole, showing “dumbbell shape ”Non-uniform distribution;“ dumbbell-shaped ”at both ends of the center of the oval is the largest displacement of the region, with the water injection process continues to move away from the maximum displacement zone to the direction of the hole, the ellipse of the long and short axis with the water injection time and pressure Increase gradually larger.