基于矿−热共采的深部高温岩层地下巷道硐室建造技术思考

Thoughts on roadway and chamber construction technology in deep rock for mineral–geothermal co-mining

  • 摘要: 我国矿产开采逐渐向深部发展,深部矿产和地热能共采是保障深部资源持续利用的重要手段。深部巷道硐室的建造面临诸多新的挑战与技术难题,高温、高地应力是深部岩层的两大特点。矿−热共采模式的发展需首要寻找到应对这两大难题的技术方案。在分析深部高温岩层巷道硐室建造的战略地位及意义的基础之上,针对深部巷道硐室建造中面临的热害问题、围岩稳定性控制问题总结介绍了现有的技术手段,说明了其在矿−热共采模式下深部巷道硐室建造中面临的不足之处,给出了未来的发展方向。矿−热共采模式下深部巷道硐室的建造应着重解决高温、高压下岩石基本物理力学特性不清晰、围岩稳定性控制技术落后的问题,形成地质精细勘察−优选围岩降温及稳定性控制技术−巷道硐室全寿命风险监控的技术体系。

     

    Abstract: With the depletion of shallow mineral resources, China’s mineral mining is gradually developing into deep rock mining, which will become an important source of mineral resources in China. The mineral geothermal co-mining technology can reduce the heat disaster and utilize the geothermal resources simultaneously, thus being a deep mining technology with wide applications in the future. The co-mining of deep mineral and geothermal energies is an important means to ensure the sustainable utilization of deep resources. However, the construction of deep roadways and chambers faces many new challenges and technical issues. High temperature and stress are the two major characteristics of deep rock, causing completely different mechanical characteristics of deep strata to those of ordinary strata. Technical solutions are required to resolve these two problems in the development of mineral–geothermal co-mining. This study analyzed the strategic position and significance of roadway and chamber construction in deep high-temperature strata and introduced the basic theory of roadway and chamber construction technology in a deep high-temperature environment. Current research is insufficient for application in practical engineering; thus, in the future, diagenetic rock characteristics of rocks under high temperatures should be studied, and the stress–strain characteristics of deep strata under multifield coupling should be described. Targeting the problems of heat disaster and surrounding rock stability control in the construction of deep roadways and chambers, this study summarized and introduced the existing techniques and analyzed the shortcomings in the construction of deep roadways and chambers with co-mining. The traditional deep roadway and chamber construction technology does not fully utilize the resources and fails to provide enough safety guarantees. The construction of deep roadways and chambers should understand the obscure fundamental, physical, and mechanical properties of rock under high temperature and stress and deal with the backward control technology of surrounding rock stability. In addition, new technologies and materials should be used to improve the utilization rate of geothermal energy and achieve carbon neutralization. Finally, establishing a technical system for fine geological survey, optimization of surrounding rock cooling and stability control technology, and roadway and chamber risk monitoring is discussed in this paper.

     

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