深部硬岩靶向精准诱变改性非爆机械连续开采理论与技术

Theory and technologies for targeted precision-induced modification in non-explosive mechanized continuous mining of deep hard rock

  • 摘要: 本文聚焦深部硬岩矿体开采面临的三大难题:矿岩特性原位感知困难、深部硬岩矿体精准改性机理不清、非爆机械连续破岩技术欠缺,开展深部硬岩靶向精准诱变改性非爆机械连续开采理论与技术研究,提出“深部硬岩靶向精准诱变改性”理论构想,构建硬岩矿体“表征–改性–开采”协同方法体系. 开发深部矿岩力学特性原位智能感知与结构面识别方法,实现矿岩特性的实时精准表征;探究深部硬岩矿体原位诱变改性机理,揭示高应力与高储能的双重作用机制,提出将潜在岩爆风险致灾能转化为促进硬岩破碎致裂能的诱变调控方法;建立机械化破碎与智能调控技术体系,集成智能感知、实时反馈与自适应控制功能,实现深部硬岩的高效智能连续破碎. 系统梳理了深部硬岩矿体非爆机械连续开采理论、技术及装备的发展方向,为深部硬岩矿体开采技术变革与升级提供有益参考.

     

    Abstract: This study focuses on addressing three major challenges encountered in the mining of deep hard rock ore bodies: difficulty in real-time in situ perception of ore-rock characteristics, unclear mechanism of precision-induced modification of deep hard rock ore bodies, and lack of non-explosive mechanized continuous rock-breaking technologies. To systematically resolve these issues, comprehensive theoretical and technical investigations are conducted with respect to targeted precision-induced modification for non-explosive mechanized continuous mining in deep hard rock. An innovative theoretical concept of “targeted precision-induced modification of deep hard rock” is proposed, and a synergistic methodological system integrating “characterization–modification–mining” is established for hard rock ore bodies. An in situ intelligent sensing method for mechanical properties and structural surface identification of deep rock is developed, achieving real-time and accurate characterization of ore-rock properties. This method utilizes multi-physical sensor arrays, including torque, thrust, rotational speed, specific energy, borehole imaging, and acoustic emission parameters, combined with deep-learning inversion algorithms to dynamically interpret rock strength, integrity, and structural plane occurrence. Furthermore, computer vision and deep neural networks are employed for intelligent recognition of structural planes from borehole panoramic images and face digital images, enabling three-dimensional reconstruction and achieving a paradigm shift from “single-parameter measurement” to “multi-source information perception” of ore-rock characteristics. The in situ induced modification mechanism of deep hard rock ore bodies is thoroughly examined, revealing the dual mechanism of high stress and high energy storage. A mutation regulation method is proposed to transform the disaster-causing energy of potential rockbursts into fracturing energy, which promotes hard rock fragmentation. This is achieved via a synergistic induction modification technology that combines high-stress/high-energy induction control with array-based pulsed hydraulic fracturing. Targeted fracturing of deep ore rock is achieved by dynamically guiding the distribution of high-stress fields and high-energy storage and coupling it with modification media such as high-pressure pulsed water. This approach significantly improves the cuttability of ore rock while converting rockburst energy into controlled rock fracturing energy. This effectively suppresses the occurrence of dynamic disasters, such as rockbursts, and realizes the transformation of deep high-stress/high-energy rock mass from sudden “disaster-causing” to gradual “fracturing” mechanical behavior. A mechanized crushing and intelligent control technology system is established, integrating intelligent sensing, real-time feedback, and adaptive control functions to achieve efficient and intelligent continuous fragmentation of deep hard rock. Innovative designs include a mechanical tool concept integrating rotary cutting, rolling, and impact functions, and the development of new continuous rock-breaking cutterheads for high-stress conditions. Research on intelligent control technology for non-explosive mechanical mining of deep hard rock ore bodies has provided key technologies such as ore-rock characteristic perception while mining and fine control of rock-breaking parameters. A non-explosive mechanical continuous mining environment monitoring and self-organizing interactive feedback system is constructed. This system incorporates a new deep hard rock non-explosive continuous mining mode centered on “our-process synergy” comprising in situ ore-rock characterization, in situ hard rock modification, original-state rock-breaking interaction, and in situ environmental monitoring. Additionally, this study systematically outlines the development directions of theory, technology, and equipment for the non-explosive mechanized continuous mining of deep hard rock ore bodies, providing a useful reference for the transformation and upgrading of mining technologies for deep hard rock ore bodies. The research outcomes offer systematic theoretical and technical support for achieving safe, efficient, green, and intelligent mining of deep hard rock resources. This consequently promotes the historic transition from “drill-and-blast mining” to “non-explosive continuous mining” in deep hard rock ore bodies.

     

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