某矿双回撤通道末采阶段围岩力学特征与支护优化  

Mechanical Characteristics and Support Optimization of Surrounding Rock in the Last Mining Stage of Double Withdrawal Channel in a Mine

作　　者：鲁蒙[1] LU Meng(Guizhou Branch of Shijiazhuang Design and Research Institute of Coal Industry)

机构地区：[1]煤炭工业石家庄设计研究院贵州分院

出　　处：《现代矿业》2023年第5期100-103,共4页Modern Mining

摘　　要：为了更好地控制由回采扰动引起的回撤通道围岩变形问题,采用理论分析、数值模拟以及现场监测与验证相结合的方法,对回撤通道围岩变形机理进行理论分析,采用FLAC3D 6.0数值模拟软件,模拟双回撤通道在受到回采工作面推进扰动过程中围岩载荷运移现象,以及支护参数优化后的支护效果,最后在现场对优化后的支护进行支护验证。结果表明,工作面回采对回撤通道围岩变形影响很大,工作面的推进会引起回撤通道整体围岩应力增高,应力集中范围扩大以及回撤通道顶板应力降低,并在回撤通道与回采工作面之间煤体上应力集中现象最明显。支护参数优化后,回撤通道顶底板几乎没有发生塑性变形,两帮发生的变形量较小。现场数据表明,回撤通道顶底板和两帮移近量比优化前分别减少了18%和78%。In order to better control the surrounding rock deformation of the withdrawal channel caused by mining disturbance,theoretical analysis,numerical simulation,field monitoring and verification were used to analyze the deformation mechanism of the surrounding rock of the withdrawal channel.FLAC3D 6.0 numerical simulation software was used to simulate the load migration of surrounding rock in the process of the double withdrawal channel being disturbed by the advancing of the mining face.And the sup⁃porting effect after the optimization of supporting parameters.Finally,correlation of the support optimization is verified on site.The results show that the working face mining has a great influence on the deformation of the surrounding rock in the withdrawal channel.The advancing of the working face will lead to the increase of the stress in the whole surrounding rock of the withdrawal channel,the expansion of the stress concentra⁃tion range and the reduction of the stress in the roof of the withdrawal channel,and the stress concentration on the coal body between the withdrawal channel and the working face is the most obvious.After the optimi⁃zation of support parameters,plastic deformation almost does not occur in the top and bottom of the with⁃drawal channel,and the deformation of the two sides is small.Field data show that the proximity of the top and bottom plates and two sides of the withdrawal channel are reduced by 18%and 78%respectively.

关 键 词：回撤通道 围岩力学特征 支护优化 数值模拟 

分 类 号：TD353[矿业工程—矿井建设] TD322