公路隧道概率极限状态设计方法

Probabilistic Limit State Design Method of Highway Tunnel

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 structure design method, applying the reliability theory into highway tunnel design is the developing trend today. The present development situation of reliability theory in highway tunnel was introduced. It is pointed out that there is few research on the statistical characterization about load of different spans and resistance factor of surrounding rock in research of highway tunnel reliability, which makes the probabilistic limit state design difficult in highway tunnel. In view of this, the reliability analysis method of highway tunnel was emphatically analyzed, and the thought to achieve the probabilistie limit state design was proposed. The uncertain problems in tunnel engineering, including the uncertainties of geotechnical constitutive relation and parameters, surrounding rock in space, calculation model and method, were discussed. It is necessary to enhance the research on the uncertain problems in the highway tunnel.