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中文摘要：
运用RFPA2D进行岩石试样瞬态卸掉围压数值试验研究,旨在探讨在不同地应力条件下隧道、洞室等实际工程开挖时诱发的岩爆过程和机理.首先进行单轴加载数值试验,然后进行同围压不同轴向应力下瞬时卸载围压诱发岩爆数值试验.结果表明：单轴加载时试样集中某狭窄带破坏,有少量微震事件;瞬态卸载却集中自由面附近较大面积损伤,卸载前几乎没有微震事件发生;当低轴向应力卸掉围压时,试样表现张性为主剪切为辅复合形式破坏;高轴向应力卸去围压时,试样呈现剪切为主瞬时块状塌落破坏.
英文摘要：
The numerical tests of rock specimens were simulated by using the code of RFPA2D with confining pressure transiently unloaded.The objective is to study the mechanism and process of the rockburst under different geostatic stress conditions,which is caused by transient unloading during the excavation of the actual engineering such as underground tunnels and chambers.A numerical test of uniaxial loading was carried out,and then several rockburst experiments with same confining pressure transiently unloaded were carried out under different axial stresses.The simulation results verified that ① the failure of specimens is concentrated on some narrow belt.Only a few micro-seismic events happen before total failure,whereas large area damage and cracks occur after transiently unloading.Then critical breach on the whole specimen is caused nearby the free surface during unloading test.On the contrary,micro-seismic events hardly happen before transient unloading;② the combination of primary slabby shade failure of split and secondary shearing failure is presented when confining pressure is quickly unloaded under a low axial stress.Block breakage of shearing failure takes on principally when confining pressure is moved away suddenly under high axial stress.
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