摘要
以准东煤田大井二号煤矿BM煤层的分层开采为例,利用FLAC^(3D)数值模拟得到采动后上覆岩层的体积应变增量切片。分析结果表明:受煤层采动影响,覆岩移动破坏区域由采空区向深部延伸,大致呈鞍形分布。覆岩裂隙发育速度随各分层开采逐渐减缓,裂隙发育高度与已采煤层厚度成幂函数关系。
Provide a case study of slice mining of BM coal seam in Zhundong coalfield No.2 colliery which have applied FLAC3D to do the numerical simulation about overburden strata movement. As a result, the volumetric strain increment of numerical model in the period after slice mining is got successfully. The analysis of numerical simulation presents the destructive and transformative strata influenced by mining extends from goaf to deeper interior forming a saddle-backed distribution. The development rate of strata fissure gradually decrease with depositing of each layer, there is a power function relationship between the height of fracture development and the coal seam thickness being exploited.
出处
《煤炭技术》
CAS
北大核心
2016年第8期49-51,共3页
Coal Technology
基金
2014年国家大学生创新训练项目(201410290059)
国家重点基础研究发展计划(973计划)项目(2015CB251600)
国家自然科学基金(51474206)
关键词
巨厚煤层开采
分层开采
覆岩移动
ultra-thick seam mining
slicing
overburden strata movement
