摘要
为了掌握下邻近层的瓦斯沿底板涌出本层的规律,探讨了开采对工作面底板的影响,认为随着工作面推进和采空区的形成,采场周围的应力发生重新分布,造成在周围煤体一定范围内出现应力增高区和应力降低区。在支承压力作用下,煤体底板煤岩层将发生不同程度的移动,产生剪切变形而发生剪切破坏,产生离层裂隙及垂直裂隙,使下邻近层的瓦斯涌入到开采层。对底板破坏范围进行了计算,给出了底板破坏的极限深度公式,据此在工程实践中布置了底板低位钻孔进行瓦斯抽放,取得了非常好的抽放效果。
In order to master the laws of gas emission through floors from lower adjacent seam,discussed the effect of working face mining on floor,and considered face advance and forming process of the mined-out area made redistribution of stress distribution around mining stope,and caused the stress increasing zone and the stress decreasing zone appeared in a certain range of coal body.Floor rock may shift differently in abutment pressure,undergo shear deformation and damage in shear,produce cracking of separated strata and vertical fracture,and cause gas pour into mining layer.The destroy range of floor was calculated and limit depth formula of floor damage was given.Hereby,low drilling in floor was arranged for gas extraction in engineering practice and a good effect was realized.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第3期417-419,共3页
Journal of China Coal Society
基金
黑龙江省自然科学基金资助项目(E200610)
黑龙江省教育厅学术青年骨干资助计划资助项目(1153G035)
关键词
工作面底板
破裂规律
瓦斯抽放
裂隙
解放层
working face floor
breaking law
gas extraction
fracture
liberated seam
