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实用矿山压力控制理论研究进展与突破的重点

Research progress and key breakthroughs of practical mine pressure control theory

  • 摘要: 与岩层运动有关的重大灾害在煤矿事故灾害中占主导地位, 建立并完善矿山压力控制理论是控制相关灾害的基础。在回顾矿山压力理论发展历程的基础上, 总结凝练了以上覆岩层运动为中心的“实用矿山压力控制理论”的内涵, 从理论、技术、装备方面总结了实用矿山压力控制理论的突破。在理论方面: 构建了显示覆岩运动和支承压力分布发展变化规律的采场动态结构力学模型, 确定不同采动条件下模型的动态发展规律; 建立了两个应力场理论, 揭示了内应力场实现的条件; 构建了以位态方程为核心的工作面顶板控制力学模型, 建立了工作面顶板控制(支架受力)与岩梁位态之间的关系。在装备方面: 研发了三维相似材料模拟试验台、矿压机械模拟试验台等装备, 实现了矿山岩层运动规律和支承压力分布规律反演模拟; 研制了大量程(200~300 mm)、高精度(0.01 mm)顶板动态仪等监测仪器, 形成了岩层动态成套监测装备和平台; 搭建了覆岩运动仿真模拟系统, 将力学模型以计算机的形式进行展示, 实现了矿山压力的仿真与决策。在技术方面: 提出了井下岩层动态观测技术, 实现了基本顶来压预测预报; 提出小煤柱沿空掘巷技术, 将回采巷道布置在稳定的内应力场中, 成功控制了传统大煤柱护巷诱发的冲击地压、瓦斯突出等动力灾害。最后, 凝练了该理论的思维内核, 兼具哲学战略性、功能导向性、效果实用性及风险回避性, 并指出理论应重点突破的五大前沿方向为采动条件极端化、岩层运动调控化、采动应力调控化、矿山压力利用化与无为化。

     

    Abstract: Major disasters associated with strata movement constitute a predominant share of coal mine accidents. Establishing and perfecting mine pressure control theory is fundamental to controlling these related disasters. Based on a review of the development history of mine pressure theory, this paper summarized and refined the connotation of the ‘practical mine pressure control theory’ centered on overlying strata movement. Key breakthroughs in this theory were examined from three aspects, i.e., theory, technology, and equipment. In terms of theory: A dynamic structural mechanics model of the stope which reveals the evolving patterns of overlying strata movement and abutment pressure distribution was constructed, and the dynamic development characteristics of the model under different mining conditions were determined. The ‘two stress fields theory’ was established, and the conditions for the formation of an internal stress field were clarified. In addition, a mechanical model for working face roof control, with the position equation as its core, was built, establishing the relationship between roof control (load on supports) and the position of the rock beam. In terms of equipment: Equipment such as a three-dimensional similar material simulation test platform and a mine pressure mechanical simulation test platform were developed, which enabled the back-analysis simulation of strata movement laws and abutment pressure distribution. Monitoring instruments like large-range (200–300 mm), high-precision (0.01 mm) roof dynamic monitors were developed, forming a complete set of monitoring equipment and a platform for dynamic strata behavior. Besides, a simulation system for overlying strata movement was established. This system visualizes the mechanical models through computer simulation and facilitates mine pressure simulation and decision-making. In terms of technology: The dynamic observation technology for underground strata was proposed, enabling the prediction of main roof weighting. Meanwhile, the technology of gob-side entry driving with narrow coal pillars was developed. By positioning extraction roadways within the stable internal stress field, this technology successfully controls dynamic disasters such as rock bursts and gas outbursts induced by traditional roadways protected by large coal pillars. Finally, the philosophical essence of the ‘practical mine pressure control theory’ was distilled, characterized by strategic foresight, functionality orientation, practical effectiveness, and risk aversion. Five key frontier directions for future breakthroughs were identified: extreme mining conditions, controlled strata movement, regulated mining-induced stress, utilization of mine pressure, and non-intrusive control.

     

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