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随着结构设计方法的发展,将可靠度理论应用于公路隧道工程设计是当今的发展趋势。介绍了可靠度理论在隧道工程中的现状,指出公路隧道可靠度研究中关于不同跨度的荷载、围岩抗力系数等的统计特征的研究较少,使得公路隧道概率极限状态设计存在困难。鉴于此,重点分析了公路隧道可靠度分析方法,提出了实现公路隧道概率极限状态设计的思路。探讨了隧道工程中的不确定性问题:岩土介质本构模型和参数的不确定性、围岩在空间各点上的不确定性、计算模型和计算方法的不确定性,指出有必要加强隧道工程中不确定性问题的研究。
With the development of structural design method, the application of reliability theory to highway tunnel engineering design is the trend of development today. The current status of reliability theory in tunneling is introduced. It is pointed out that there are few researches on the statistical characteristics of the load, surrounding rock resistance coefficient and so on in the study of highway tunnel reliability, which make it difficult to design the limit state of highway tunnel. In view of this, the paper mainly analyzes the reliability analysis method of highway tunnels and puts forward the idea of realizing the limit state design of highway tunnels. The problems of uncertainty in tunnel engineering are discussed: the uncertainty of constitutive model and parameters of geotechnical media, the uncertainty of surrounding rock in every point of space, the uncertainty of calculation model and calculation method, and the necessity of strengthening Research on the Uncertainty in Tunnel Engineering.