急斜煤层浅转深综放开采煤岩动力灾害诱发机理

1.西安科技大学 能源学院,陕西 西安 710054; 2.教育部 西部矿井开采及灾害防治重点实验室,陕西 西安 710054; 3.劳伦森大学 Bharti工程学院,安大略 萨德伯里 P3E 2C6; 4.神华新疆能源有限责任公司,新疆 乌鲁木齐 830027

急倾斜煤层; 浅转深开采; 应力差异系数; 空间层位; 循环动力冲击

Mechanism of dynamic hazards due to coal and rock mass instability in extremely steep coal seams with the deepening mining
LAI Xing-ping1,2,SUN Huan1,2,3,CAI Ming3,CHEN Jian-qiang4,CHANG Bo4

(1.College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Key Laboratory of Western Mine Exploration and Hazard Prevention,Ministry of Education,Xi'an 710054,China; 3.College of Bharti Engineering,Laurentian University,Sudbury P3E 2C6,Canada; 4.Shenhua Xinjiang Energy Co.,Ltd.,Urumqi 830027,China)

extremely steep coal seams; deepening mining; in-situ stresses discrimination coefficient; space and horizontal section; cyclical dynamic shock

DOI: 10.13800/j.cnki.xakjdxxb.2017.0301

备注

中国煤炭资源深部开采已成为常态。依托急倾斜煤层开采为工程背景,构建考虑水平分段综放开采影响的浅转深开采组合梁模型,引入应力差异系数(α)表征浅转深开采煤岩体应力状态特征,分析地表大尺度裂隙与工作面相对空间层位关系,揭示急倾斜煤层浅转深开采煤岩体动力灾害诱发机理,对指导急倾斜煤层深部开采具有重要意义。研究表明:通过全景智能钻孔图像信息辨识揭示了急倾斜煤岩层纹层角与倾斜层理方向基本一致,说明煤岩层处于强压缩构造状态; 浅转深开采应力差异系数呈非线性增长,确定临界开采α为0.4; 急倾斜煤层浅转深开采动力灾害诱发实质为水平分段多阶段重复扰动下覆层结构失稳产生循环性动力冲击。

Deep coal mining has become a common practice with shallow coal resources depletion in China.The combination beam model is built according to the condition of horizonal section top coal caving(HSTCC).In-situ stresses discrimination coefficient(α)is quantitatively used to describe the stress condition with the deepening coal and rock masses.Relation modelof relative space and horizontal sectionis built with position of ground surface fractures and workplaces.Mechanism of dynamic hazards due to coal and rock mass instability can be revealed,which is of significant guidance for the deep mining in extremely steep coal seams.Results show that micro-stratification angle is approximately equal to the inclined bedding by analyzing panorama images using intelligent recognition function of borehole TV,which indicates that coal and rock seams are in the condition of strong tectonic compression.In-situ stresses discrimination coefficient(α)shows non-linear increase with the mining depth,which is about 0.4 on the condition of critical mining.The dynamic hazards are triggered by cyclical shock of overlying strata structure instability under the circumstance of the multi-level mining disturbance.