高地温环境树脂锚固剂性能劣化规律微观机理研究

Study on the microscopic mechanism of performance degradation law of resin anchoring agent in high ground temperature environment

  • 摘要: 煤炭深部开采中,高地温环境导致锚固支护结构失稳,严重威胁煤矿安全高效开采,而树脂锚固剂性能对此影响显著。为此,深入研究高地温环境下树脂锚固剂的性能变化规律。首先,通过室内试验模拟不同地温环境,测试树脂锚固剂的胶凝时间、粘度、抗压强度及拉拔力,结合数字散斑技术(DIC)与扫描电子显微镜分析,发现随温度升高,锚固剂胶凝时间缩短、粘度增大,单轴抗压强度及拉拔力显著下降,力学性能劣化明显。其次,采用分子动力学模拟,分析温度对树脂锚固剂自身强度及围岩-锚固剂界面性能的影响,揭示出温度升高会使树脂自由体积增大,303.15 K(30℃)至363.15 K(90℃)条件下自由体积分数由38.3%升至40%,高分子链段均方位移增加,扩散能力增强,且界面相互作用能降低,进而削弱黏结强度。最后,针对性提出“材料改性+锚固界面强化+工艺适配”协同控制策略,以提升高地温环境下树脂锚固支护强度,为深部矿山安全高效生产提供技术支撑。

     

    Abstract: In deep coal mining, the high ground temperature environment causes instability of the anchoring support structure, which seriously threatens the safe and efficient mining of coal mines, and the performance of resin anchoring agents exerts a significant influence on this issue. Therefore, an in-depth study was conducted on the performance evolution of resin anchoring agents in a high ground temperature environment. First, laboratory tests were carried out to simulate different ground temperature conditions, and the gelling time, viscosity, compressive strength and pull-out force of resin anchoring agents were measured. Combined with digital image correlation (DIC) technology and scanning electron microscopy analysis, it is found that with the increase of temperature, the gelling time of anchoring agents is shortened, the viscosity is increased, and the uniaxial compressive strength and pull-out force decrease significantly, indicating an obvious deterioration of mechanical properties. Second, molecular dynamics simulation was adopted to analyze the effect of temperature on the intrinsic strength of resin anchoring agents and the performance of the surrounding rock-anchoring agent interface. The results reveal that increasing temperature enlarges the free volume of the resin: the free volume fraction rises from 38.3% to 40% under the conditions of 303.15 K (30℃) to 363.15 K (90℃). Meanwhile, the mean square displacement of resin chain end increases, the diffusion capacity is enhanced, and the interfacial interaction energy is reduced, thereby weakening the bonding strength. Finally, a synergistic control strategy incorporating material modification, anchoring interface strengthening, and construction process adaptation is specifically proposed to enhance the resin anchoring support strength in high geothermal environments, thereby providing technical support for the safe and efficient mining of deep coal mines.

     

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