单双压头动静组合载荷破岩数值试验研究

摘要

Numerical crushing experiment of brittle rock(granite)by different load patterns under single -cutter head and dual -cutter head has been done with the rock failure process analysis software -RFPA2D . Acoustic emission activities are used to measure the rock crushing effect.Results show that (1)If the static load is too small or the stress wave amplitude is smaller than rock strength,the rock crushing effect is very poor.(2) No matter it is single -cutter head or dual -cutter head,coupled static and dynamic loads can raise the rock crushing effect substantially.In addition,the acoustic emission energy under single cutter head is more than dual-cutter head.(3)The head space has an effect on the rock crushing effect of rock crushing by combined dynamic and static loads under dual -cutter head.%应用岩石破裂过程分析软件 RFPA2D ，以脆性岩石花岗岩为研究对象，进行了对单压头和双压头在不同加载模式下的破碎数值试验，采用声发射活动作为衡量标准表征破岩效果。结果表明：所加静载较小或动载荷应力波幅值小于岩石强度时破岩效果差；动静组合载荷加载条件下单压头和双压头均能大幅提高岩石破碎效果，且单压头破岩声发射能量大于双压头；双压头动静组合载荷破岩时压头间距对破岩效果有影响。