为有效评估巷(隧)道围岩在掘进过程中的整体稳定性,在圆形巷道经典弹塑性模型基础上,引用边坡失稳判定方法,建立圆形巷道顶底部岩体的滑动失稳破坏模型,编制一个能够对该模型进行自动快速反演分析的计算程序.自动反演分析结果表明:(1)为准确判断巷道顶底部岩体的稳定性及滑动位置,不能对推导出的巷道失稳破坏模型公式进行简化计算;(2)圆形巷道的整体稳定性将随计算厚度的增加、侧压力系数的增大以及竖向应力的减小而逐渐增大;(3)建立的滑动失稳破坏模型不仅能够定量和定性分析巷道岩体的整体稳定性,而且还能确定巷道周边岩体潜在或真正的滑动面位置.%In order to effectively assess the overall stability of surrounding rock of roadway in the excavation process,a determination method of slope instability was proposed based on the classic elastoplastic model of circular roadway.A damage analysis model caused by sliding and unstable failure of surrounding rock in the top/bottom of circular roadway was established and a calculation program which could inversion analysis the model automatically and quickly was developed.Automatic inversion results show that:(1) in order to accurately determine the slide position and the stability of surrounding rock in the top/bottom of circular roadway,the formula of unstable failure model that had been deduced could not be simplify calculated;(2) the overall stability of roadway would gradually increase with increasing calculation thickness,increasing lateral pressure coefficient and reducing vertical stress;(3) the damage analysis model established not only could quantitative and qualitative analysis of the overall stability of surrounding rock,but also could point out the potential or real slide position of surrounding rock in roadway.
展开▼
