“三高”环境下煤矿锚杆腐蚀机理研究与支护优化

Corrosion mechanism and support optimization of coal mine bolt under “three heights” environment

  • 摘要: 我国深部巷道围岩长期处于高地应力、高地温、高盐水的“三高”腐蚀环境中,造成支护锚杆在短期内发生严重腐蚀,导致支护强度大幅下降,矿井采掘安全系数显著降低。研究发现锚杆的腐蚀破坏为应力腐蚀与电化学反应的综合效果,故提出从生产施工技术和材料优化防护两方面入手,对矿井锚杆锚索进行防腐蚀治理。主要包括,矿井疏放水、锚杆锚索全长锚固、巷道表层封闭、开发耐蚀性材料、优化加工工艺、防腐蚀表面处理等,并给出了腐蚀环境下的锚杆锚索支护设计原则和流程。该研究成果可为同类矿井的锚杆支护提供一定借鉴意义,带来良好的经济效益和社会效益。

     

    Abstract: The surrounding rock of the deep roadway in China is in the “three high” corrosion environment of high ground stress, high ground temperature and high salt water for a long time, resulting in serious corrosion of the supporting bolt in a short period of time, leading to a large decrease in the support strength and a significant decrease in the safety factor of mining.It is found that the corrosion failure of bolt is a comprehensive effect of stress corrosion and electrochemical reaction, so it is proposed to prevent corrosion treatment of mine bolt cable from two aspects of production and construction technology and material optimization and protection, including: mine drainage water, bolt anchor cable full-length anchorage, roadway surface closure, development of corrosion-resistant materials, optimization of processing technology, anti-corrosion surface treatment, etc.The design principle and flow of bolt anchor cable support under corrosive environment is given.

     

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