大直径玻璃钢锚杆工作面帮支护性能试验研究

Experimental study on panel side supporting performance of large diameter FRP bolts

为解决瓦斯矿井采煤机截齿与钢质锚杆摩擦产生火花的问题,作者致力于用玻璃钢(FRP)锚杆代替钢制锚杆对巷道工作面帮进行支护,为此开展不同锚固方式条件下FRP锚杆力学性能试验研究;基于厚壁理论建立锚杆锚固力测试模拟模型,并进行实验室及现场应用试验。结果表明:27 mm的大直径FRP锚杆杆体抗拉力为278. 31 k N、抗剪切力为147. 94 kN,全锚固时杆体抗剪切力为282. 25 kN,满足矿井支护要求;实验室和现场试验拉拔力分别比螺纹钢锚杆高63%和31%,耗能值高24%;工作面帮采用FRP锚杆全锚支护,在锚杆间排距加大的条件下,支护效果仍优于原螺纹钢锚杆支护方案,可实现巷道安全支护。

To solve the problem that the friction between the shearer picks and the steel bolts in the gaseous mine production is easy to generate sparks,the paper was aimed at replacing steel bolts with FRP bolts to support the panel side.The mechanical properties of FRP bolts with different anchoring modes were studied.A simulation model was built for bolts anchorage force test based on thick walled cylinder theory,and laboratory and field tests were carried out.The results show that the 27 mm diameter FRP bolts rod tensile strength is 278.31 kN and the shear strength is 147.94 kN,when it is fully anchored,the shear strength of FRP bolts is 282.25 kN,which can meet the basic requirements of the panel side of roadway support,that the values of pulling force of FRP bolts in laboratory and field tests are 63%and 31%more than those of rebar bolts respectively,and the energy consumption of FRP bolts is 24%higher than that of the rebar bolts,and that when panel side is supported with FRP bolts,even the bolts spacing and row spacing are increased,the supporting effect is still better than that of the steel bolts support scheme.