摘要
本文结合南昆铁路家竹箐隧道的工程实践,从理论上分析了挤压性围岩产生支护大变形的机理及特征,并提出了在设计阶段预测大变形的“应力比临界值法”。
Based upon the project practice of Jiazuqing tunnel, this paper analyses the mechanism and characters of the serious deformation of surrounding rock due to ground squeezing, provides a critical value of stress rate for the design.
