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基于深埋隧道开挖工程的高应力条件及构造应力发育特征,利用深部岩爆实验系统,模拟了两种构造应力条件下白云岩的岩爆过程:三向应力作用下板状试件瞬间卸载一个方向应力,保持其他两向应力不变或保持其中一向应力,增加另一向应力.实验获得了应力-时间、应力-应变、声发射特征及岩爆破坏规律.研究表明:本工程区内构造应力引发白云岩岩爆的可能性较大,岩爆临界深度为290m.竖向构造应力引发的岩爆表现为局部片状崩落,从卸载后发生时间看属于滞后岩爆;水平构造应力引发的岩爆强度更高,表现为块状弹射后整体破碎,属于瞬时岩爆.声发射峰值均出现在岩石裂隙发育段,而密集度最高值对应岩石破裂段.声发射峰值处的最大主应力约为岩石破裂时最大主应力的77.4%.
Based on the characteristics of high stress and tectonic stress in deep tunneling, the rockburst process of dolomite under two tectonic stresses was modeled by the deep rock burst test system. The unloading of plate specimen under three-direction stress Stress in one direction, keeping other two-way stress constant or maintaining one-way stress and increasing the other direction stress.The stress-time, stress-strain, acoustic emission characteristics and rockburst failure law were obtained.The research shows that: The probability of dolomite rock burst is more likely to be induced by stress, and the critical depth of rock burst is 290 m. The rock burst caused by vertical tectonic stress is characterized by local flaking, which belongs to lag rock burst at the time of unloading. The horizontal tectonic stress The rockburst intensity is higher, which manifests as a whole rock crushing, which belongs to the instantaneous rockburst.The peak values of acoustic emission appear in the rock fracture development zone, and the highest intensity value corresponds to the rock fracture zone.The maximum principal stress at the peak of acoustic emission is about It is 77.4% of the maximum principal stress when the rock is broken.