摘要
承压水上带压开采对于保护水资源和提高矿井采收率具有重要意义,工作面回采过程中底板破坏特征和裂隙演化规律是保证安全回采的前提。以山西某矿为试验矿井,采用分段注水、钻孔电视探测、微震技术对底板破坏深度进行研究,对工作面底板破坏裂隙演化进行数字化分析,并对采动底板破坏特征进行模拟研究,研究结果表明:缓倾斜中厚煤层底板破坏深度为31.6~34.4 m;工作面回采前裂隙发育程度低,回采后裂隙数量呈上升—下降—持平的形态分布;工作面回采前底板裂隙宽度以小于5 mm为主,采动后裂隙宽度以11~25 mm为主;随着工作面的推进,底板破坏并产生裂隙,继而裂隙宽度增加,并产生横向裂隙,底板近煤壁区域裂隙贯通,裂隙发育程度较高;底板垂直应力曲线呈“勺子”型分布且形成较大范围的塑性破坏区,是工作面开采易突水区域。
The pressure mining on pressurized water is of great significance to protecting water resources and improving mine recovery.The failure characteristics of bottom plate and crack evolution rules during the recovery of working surface are the premise for safe recovery.A mine in Shanxi Province as a test mine,The damage depth was studied by segmented water injection,drilling TV detection and micro shock technology,Digital analysis of the fracture evolution of the bottom plate,The damage characteristics of the bottom plate are simulated,The results show that the damage depth of slowly sloping medium thick coal bottom slab is 31.6-34.4 m;Low fracture development degree before working surface recovery,The number of cracks after recovery rose-down-flat morphological distribution;The crack width of the working surface recovery is mainly less than 5 mm,The crack width after mining is mainly 11-25 mm;As the working surface advances,The bottom plate destroys and creates cracks,Then the crack width increases,And produce the transverse cracks,Through the crack of the bottom plate near the coal wall area,Crack development degree is high;The vertical stress curve of the bottom plate is“spoon”and forms a large range of plastic damage area,It is the working surface mining water penetration area.
作者
郎君
LANG Jun(Department of Mining Engineering,Lüliang University,Lüliang 033000,China)
出处
《中国测试》
CAS
北大核心
2022年第9期46-52,共7页
China Measurement & Test
基金
山西省高等学校科技创新项目(2019L0954)。
关键词
矿业工程
底板破坏
裂隙演化
中厚煤层
mining engineering
floor failure
fracture evolution
medium thick coal seam
