锚杆拱形托板承载力试验与分析

为深入认识拱形结构对钢托板力学特性的影响,及其与不同锚杆匹配的承载适用性,基于球壳结构弹性力学与极限平衡分析构建了2种拱形托板承载力理论关系式,结合工程实践详细论述了其中5个影响参数。采用实验室加载试验研究了不同板厚、不同拱高的方形托板承载力与变形特征。结果表明:托板承载力与钢板厚度、拱高与拱底圆直径之比呈正增长关系;试验承载力较好地验证了理论计算式的适用性;此外,调向球垫尺寸与强度对托板承载与支护的充分发挥非常重要。综合以上研究与煤炭行业标准,提出常用锚杆规格与拱形托板尺寸的合理匹配表,以供矿山支护工程参考使用。

Experiment and analysis of bearing capability of arched pallet for anchor bolts

For further understanding of the influence of arched structure on steel pallet’s mechanical property, and its bearing applicability when matching with different bolts, two equations of bearing ca-pability relationship of arched pallet was established through elastic mechanics theory and limit equilib-rium method analysis of shell structure, in which the five impact parameters were discussed based on support engineering practice.Bearing capability and deformation characteristics of square pallets with different thickness and different arch height were investigated through laboratory loading test.The re-sults have shown that, the pallet bearing capability has a positive growth relationship with its steel plate thickness, proportion of arch height and the bottom circle diameter.Test of bearing capability well ver-ified the correctness of the theoretical relationship, and the size and strength of adjustable ball-pad played a very important role for full bearing capability and support effect of arched pallet.Based on the above studies and the coal industry standard, a reasonable reference table was proposed for matching ordinary anchor bolts specification and different arched pallets’ size, which would have reference value for mines’ support engineering.