锚杆及钢带协同作用下的岩块力学特性试验研究

Experimental study on mechanical properties of rock block under collaborative action of anchor rod and steel strip

为研究钢带及锚杆对锚固体的作用机理,利用RMT-150C岩石力学试验加载系统,进行了端锚与全锚加钢带和不加钢带试件的单轴加载对比试验,比较了锚固方式和支护密度对试件的锚固效果。研究结果表明,全锚锚杆在提高试件强度方面比端锚锚杆效果更强。安装钢带的试件的峰值强度总体较未加装钢带的试件得到较大提升,但随着锚杆数量的增多,这种提升效果逐渐减弱;此外,钢带对全锚试件的提升效果优于端锚试件。安装钢带的试件在抗压强度和侧向抗拉强度方面均有所提升。锚杆的支护密度应与试件大小相适应,过密的支护密度同样会弱化试件强度。

In order to study the action mechanism of steel band and anchor rod on anchor mass,uniaxial loading comparison test of end anchor and full anchor with steel strip and without steel strip was carried out by using RMT-150C rock mechanics test loading system,and the anchoring effect of anchoring method and supporting density on the specimens was compared.The results show that the full anchor bolt has a stronger effect than the end anchor bolt in improving the strength of the specimens.The peak strength of the specimens installed with steel strips is generally higher than that of the specimens without steel strips,but with the increase of the number of bolts,this effect is gradually weakened.In addition,the lifting effect of steel strip on the whole anchor specimen is better than that of the end anchor specimen.The installation of steel strip specimens has improved both compressive strength and lateral tensile strength.The supporting density of anchor rods should be suitable for the size of the specimen,and an overly dense supporting density will also weaken the strength of the specimen.