刘少伟, 贺德印, 付孟雄, 张伟光. 树脂锚固剂搅拌过程仿真及高效搅拌构件优化实验[J]. 煤炭学报, 2020, 45(9): 3073-3086. DOI: 10.13225/j.cnki.jccs.2019.0864
引用本文: 刘少伟, 贺德印, 付孟雄, 张伟光. 树脂锚固剂搅拌过程仿真及高效搅拌构件优化实验[J]. 煤炭学报, 2020, 45(9): 3073-3086. DOI: 10.13225/j.cnki.jccs.2019.0864
LIU Shaowei, HE Deyin, FU Mengxiong, ZHANG Weiguang. Numerical simulation of mixing process of resin grout and optimization experiment of high-efficiency mixing component[J]. Journal of China Coal Society, 2020, 45(9): 3073-3086. DOI: 10.13225/j.cnki.jccs.2019.0864
Citation: LIU Shaowei, HE Deyin, FU Mengxiong, ZHANG Weiguang. Numerical simulation of mixing process of resin grout and optimization experiment of high-efficiency mixing component[J]. Journal of China Coal Society, 2020, 45(9): 3073-3086. DOI: 10.13225/j.cnki.jccs.2019.0864

树脂锚固剂搅拌过程仿真及高效搅拌构件优化实验

Numerical simulation of mixing process of resin grout and optimization experiment of high-efficiency mixing component

  • 摘要: 针对树脂锚杆工程应用中普遍存在的多种锚固失效问题,着重分析了树脂锚杆锚固系统黏结失效问题及影响因素,发现树脂锚固剂搅拌效果对其发生有重要影响。为有效降低锚固系统黏结失效问题的影响,提升树脂锚固剂的搅拌质量,根据锚固剂搅拌工作过程及搅拌效果影响因素,研发了一种可以套在锚杆(索)端部的锚固剂高效搅拌构件。采用理论分析、数值模拟和实验室试验相结合的方法,分析了树脂锚固剂对锚固系统工作性能的重要作用,同时,完成了高效搅拌构件结构设计及参数优化、工作原理、搅拌成效及改善锚固质量的作用效果分析。结果表明:高效搅拌构件搅拌截齿斜角为30°时,其结构参数设计较为合理,此时对树脂锚固剂具有较好的搅拌效果。在锚杆顶端安装高效搅拌,可有效提高搅拌过程中树脂锚固剂的运动速度,改善锚固剂搅拌混合的均匀性及固化效果,锚固剂体积分布更加合理密实。在构件的搅拌作用下,锚固剂封装袋将破碎成较小碎片,可避免较大封装袋碎片对锚固质量的影响,有助于提高锚杆锚固质量。锚杆拉拔试验对比分析结果显示,通过在锚杆顶端安装高效搅拌构件,锚杆的拉拔力峰值、拉拔过程能量吸收能力,相较于仅有锚杆作用时均有较大提高,说明锚固系统的锚固质量及抵抗破坏的能力得到了明显增强。

     

    Abstract: In order to solve the commonly various anchoring failure problems of roof bolting,focusing on the analysis of the anchoring system adhesive failure of resin bolts and its affecting factors,it is found that the mixing effect of the resin grout has an important influence on its occurrence. In order to effectively reduce the impact of the anchor system failure problem and improve the mixing quality of resin anchoring agent,according to the mixing process of the resin grout and the influencing factors of the mixing effect,the high-efficiency mixing component of resin grout,that can be installed at the top of bolts or cable bolts,has been developed. The combination methods of theoretical analysis,numerical simulation and laboratory tests were used to analyze the important role of resin grout in the performance of anchoring system. At the same time,the structure design and parameter optimization of the high-efficiency mixing component were completed,and the component's working principle,the mixing effect and the effect of improving the anchoring quality were analyzed. The results show that when the tilted angle of the mixing blade of the component is 30°,the structural parameter design is reasonable,and the resin grout has a better mixing effect. The high-efficiency mixing component is installed at the top of bolts,the moving speed of resin grout,the uniformity and curing effect of resin grout are improved,and the resin grout distribution is denser. Under the mixing action of the component,the resin grout package is broken into smaller fragments,which avoid the impact of larger fragments on anchoring quality and help to improve the anchoring quality of anchor. The comparative analysis results of the bolt pull test show that after installing the component at the top of bolts,the pull force peak value of the bolts and the energy absorption capacity of the pull process are greatly improved compared with the case of only the bolts,and the anchoring system's ability to resist damage has been obviously enhanced.

     

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