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我国煤矿矿震特征、诱发灾害及防治技术研究

Research on characteristics, induced disasters, and prevention technology of mining-induced seismicity in China

  • 摘要: 针对我国煤炭开发西移进程中矿震问题日益凸显的现状, 分析了我国煤矿矿震的分布规律、类型特征与发生机理, 剖析了鄂尔多斯盆地硬厚顶板主导型长壁工作面矿震的形成机制, 反演了鄂尔多斯典型矿井矿震弹性波衰减系数, 提出了融合垂直井分层压裂与水平井精准压裂的地面压裂协同防治关键技术, 并开展了工程实践与验证。结果表明, 我国矿震在空间分布上具有显著的集聚性, 且矿震频次与区域煤炭产量基本正相关, 矿震高发区均为煤炭开采活动密集区域, 煤矿开采活动是诱发矿震的主要原因; 从煤矿开采方法与工艺角度, 将矿震划分为短壁工作面开采诱发矿震和长壁工作面开采诱发矿震两类, 前者由采空区煤柱失稳引发, 后者主要因硬厚顶板未及时破断导致; 鄂尔多斯地区深部长壁工作面矿震以顶板运动型为主, 构建了顶板承载结构模型, 推导了顶板断裂产生的能量计算公式, 阐述了硬厚顶板破断与岩层抗拉强度、顶板断裂与岩层厚度以及岩层厚度与能量释放的关系, 获得了鄂尔多斯典型矿井矿震弹性波衰减系数α, 均值为0.001, 揭示了硬厚顶板主导型长壁工作面矿震发生机理; 构建了涵盖井型优化、布置方式、层位识别的技术体系, 工程实践验证了地面压裂可以实现人工预裂弱化顶板, 显著降低矿震频次与能量释放, 提升工作面安全推进效率。为我国西部硬厚顶板矿区矿震及冲击地压的安全高效防控提供理论支撑与工程范式。

     

    Abstract: In view of the increasingly prominent risk of mining-induced seismicity during the westward shift of coal mining development in China, this paper systematically analyzes the distribution patterns, typological characteristics, and occurrence mechanisms of mining-induced seismicity in Chinese coal mines. Besides, the formation mechanism of mining-induced seismicity in long-wall working face dominated by hard-thick roof is examined, and the elastic wave attenuation coefficients of mining-induced seismicity for typical mines in the Ordos Basin is inverted. Finally, a key integrated technology for coordinated prevention and control via surface fracturing, which combines vertical well layered fracturing with horizontal well precision fracturing, is proposed and then validated through engineering practice. The results indicate that mining-induced seismicity in China exhibits significant spatial clustering, and the frequency of mining-induced seismicity is generally positively correlated with regional coal production. Furthermore, high-incidence areas correspond to regions of intensive coal mining activities, confirming that mining operations are the primary trigger. Additionally, based on mining methods and techniques, mining-induced seismicity can be categorized into two types: that induced by shortwall mining and that induced by longwall mining. The former is primarily triggered by the instability of coal pillars in goafs, while the latter mainly results from the delayed fracture of hard-thick roofs. In the deep long-wall working faces of the Ordos region, mining-induced seismicity is predominantly of the roof movement type. A roof load-bearing structure model was constructed, and a formula for calculating the energy released during roof fracture was derived. Consequently, the relationships among hard-thick roof fracture and rock tensile strength, roof fracture and stratum thickness, as well as stratum thickness and energy release were systematically elaborated. Notably, the average elastic wave attenuation coefficient (α) for typical Ordos mines was determined to be 0.001, elucidating the mechanism behind mining-induced seismicity in long-wall working face dominated by hard-thick roof. A technical framework encompassing well-type optimization, layout design, and horizon identification was established. Engineering practice demonstrated that surface fracturing can achieve artificial pre-fracturing to weaken the roof, markedly reducing both the frequency and energy release of mining-induced seismicity and thereby enhancing the safe advance efficiency of working faces. Overall, this study provides theoretical support and an engineering paradigm for the safe and efficient prevention and control of mining-induced seismicity and rockburst in hard-thick roof mining areas of Western China.

     

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