树脂锚固剂外包装材料破坏特征对锚杆锚固性能影响研究

Influence of broken state of anchoring agent plastic on anchoring performance of bolt

树脂锚固剂外包装常用聚酯材料,具有自身不易溶解、与锚固剂主成分不发生化学反应的特性。针对锚杆搅拌锚固剂外包装碎片掺杂于锚固段中是否影响其锚固性能问题,采用理论分析、数值模拟及实验室实验相结合的方法,分析锚杆不同端部破碎不同外包装材料后碎片在锚固环区域分布特征及锚固性能。研究结果表明:树脂锚固剂外包装材料类型对破碎效果影响较大,相较于聚酯材料,铝塑膜材料破碎状态更好,破碎量增加16%;楔形尖端锚杆相较于倾斜尖端锚杆和普通锚杆,提升了对于外包装的破碎能力,楔形锚杆破碎能力相较于倾斜尖端锚杆和普通锚杆增加26%和63%;拉拔试验对比分析发现,楔形尖端搅拌铝塑膜外包装锚固剂时,锚固系统的锚固质量及抵抗破坏的能力得到明显增强,相比常规锚固试件拉拔力峰值的平均值提升约14%。研究成果对巷道支护时锚固剂选择及提高锚固性能具有一定的理论和工程应用价值。

The outer packaging of resin anchorants is usually made of polyester material,which exhibits the characteristics of insolubility and no chemical reaction with the main components of the anchoring agent.In order to investigate whether the inclusion of fragments,which are obtained from the outer pac⁃kaging of anchor rods mixed within the anchoring section,affects its anchoring performance,theoretical analysis,numerical simulation,and laboratory experiments are adopted to analyze the distribution cha⁃racteristics of fragmented outer packaging materials in the anchoring ring area and its impact on anchoring performance for anchor rods with different end fractures.The research findings indicate that the type of outer packaging material for resin anchoring agents has a significant impact on the fragmentation effect.Aluminum⁃plastic film material exhibits better fragmentation performance than polyester material,with an increase in fragmentation of 16%.Wedge⁃shaped anchor rods have greater capabilities for fragmenta⁃tion of the outer packaging than inclined⁃tip anchor rods and conventional anchor rods,with 26%and 63%increase in fragmentation ability,respectively.Comparative analysis of tensile tests reveal that when the anchoring quality and resistance to damage of the anchoring system are significantly enhanced by a wedge⁃shaped mixing aluminum⁃plastic film outer packaging for anchoring agents,with an average in⁃crease of about 14%in the peak pulling force compared to conventional anchoring test pieces.The results can apply to select anchorage agent and improve anchorage performance theoretically and engineeringly.