摘要
为了深入了解高应力区岩爆机理、围岩失稳特征与应力场的变化关系,以黑石岭隧道岩爆为研究背景,运用强度准则理论分析、物理实验和三维应力场数值模拟的方法进行综合研究。研究发现,脆硬性岩体开挖卸荷后应力场σ_1、σ_3的变化态势对岩体破坏特征有直接影响,围岩σ_3值的增长抑制岩石的径向位移,造就应力场环向梯度的偏大,加上岩体聚集的较高的弹性应变能,是诱发岩爆的主要原因。掌握岩体岩性及破坏过程中应力-应变关系,研究分析开挖卸荷应力场的变化趋势,是预测判别岩爆及其发生位置的重要方法。
The background of this paper is the rock burst in Heishiling Tunnel. Rock burst mechanism, relationship between the characteristics of surrounding rock instability and in-situ stress field was investigated using theoretical analysis on strength, physical experiment and numerical simulation on 3D stress field. Some study results demonstrate that σ1, σ3 has direct impact on rock failure characteristics after excavation of britle rock. The increase of σ3 inhibits the radial displacement in surrounding rock, and causes larger stress field gradient in circumferential directions. Moreover, relatively high elastic strain energy exists in the rock. All of these are the main causes that induce the rock burst. Therefore, it is of importance for predicting rock burst and distinguishing occurrence positions based on the stress-strain relationship in rock failure process and stress field variation trend after excavation.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2010年第4期613-616,共4页
Journal of Liaoning Technical University (Natural Science)
基金
国家高技术研究发展计划(863)基金资助项目(2009AA11Z105)
关键词
岩爆机理
失稳特征
应力-应变
变化趋势
rock burst mechanism： instability characteristics
stress-strain
variation trend
作者简介
高永涛（1962-），男，山东乳山人，教授，博士生导师，主要从事岩土工程加固理论与稳定性分析、地压控制理论与技术方面的研究。
