深部巷(隧)道围岩的劈裂岩爆试验研究  

Experimental Research on Splitting Rock Burst of Surrounding Rocks in Deep Roadways(Tunnels)

作　　者：张晓君[1,2] 

机构地区：[1]山东理工大学资源与环境工程学院,山东淄博255049 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2011年第1期66-71,共6页Journal of Mining & Safety Engineering

基　　金：山东省自然科学基金项目(Y2008F51)

摘　　要：围岩浅部发生的爆裂松脱、片状剥落、有声响、岩片弹射等岩爆现象,多属于劈裂破坏机制.针对硬脆完整围岩浅部的劈裂岩爆现象,采用辉长岩试样,进行真三轴加卸载试验,真实模拟实际围岩的应力演化并且实现了小主应力方向的单面卸载.为便于对比分析,同时进行了双轴压缩试验,最后根据试验结果分析了卸荷劈裂岩爆机理.两种试验方法均得到了不同程度的劈裂岩爆现象,但卸荷岩样发生劈裂岩爆所需的大主应力比双轴压缩试验下的要小很多;两者的劈裂岩爆范围不同,卸荷劈裂岩爆均产生在卸荷面附近区域,这与实际的岩爆情况一致;中间主应力对围岩发生劈裂及劈裂程度起重要作用;研究结果为分析劈裂岩爆发生条件和劈裂岩爆机理以及工程预测预报提供依据.Rock burst occurs in shallow part of surrounding rock such as loose,flake off,sound,rock-chip ejection,so it mainly belongs to splitting failure.For the splitting rock burst problem of integrated hard and brittle surrounding rocks,loading and unloading tests of true triaxial compression to simulate the actual stress evolution of surrounding rock and unload one-sided principal stress are conducted using the mineral of gabbro.In order to facilitate comparative analysis,the biaxial compression tests were carried out at the same time.Finally,the mechanism of splitting rock burst is analyzed based on the test results.Although the phenomena of splitting rock burst are gained by two kinds of test methods,the maximum principal stress needed for unloading splitting rock burst is much smaller than that of biaxial compression test;the scope of the two kinds of splitting rock burst is different and unloading splitting rock burst occurs near the unloading surface which is in accord with the actual situation of rock burst;intermediate principal stress plays an important role in splitting rock burst.The research findings provide a basis for analyzing the condition and mechanism of splitting rock burst.

关 键 词：岩体力学 围岩 劈裂岩爆 辉长岩 卸荷回弹 巷道 

分 类 号：TD315[矿业工程—矿井建设]