摘要
对粉砂岩试样进行了保持轴向变形不变的卸围压试验,在对岩样的破坏分析基础上,将岩石卸荷破坏与岩爆特征联系起来.研究表明,随着卸荷初始围压值的增加,卸荷破坏状态逐渐从中等岩爆过渡到强烈以上岩爆;三轴应力状态下的岩体如果某一方向的应力突然降低,造成其在较低应力状态下破坏,那么原岩储存的弹性应变能将对外释放,进而可能引起岩爆;通过调整施工速度可以减缓或降低岩爆的发生.
Unloading confining pressure tests with fixed displacement for siltsand are conducted. Based on the analysis of failure feature, the relationship between rock failure under unloading condition and rock burst is discussed. The results show that rock failure phenomena tend to change from middle rock burst to violent rock burst with the increase of confining pressure. The decrease of stress for a certain direction could possibly lead to rock failure to the rock under three-dimensional stress. Moreover, the elastic strain energy releases could result in rock burst. Rock burst can be controlled by the progress of construction.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2007年第1期110-114,共5页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(49802026)
山东省教育厅资助项目(J01E01)
关键词
地下工程
卸荷
岩爆
underground engineering
unloading condition
rock burst
