中国铁道科学2011，Vol.32Issue(6)：55-62,8.
高地应力软弱围岩铁路隧道的衬砌压力
Lining Pressure of Railway Tunnel in High Geostress and Soft Surrounding Rock
摘要
Abstract
With Guanjiao tunnel as engineering background, the model for calculating the release ratio of excavation stress was adopted to study the lining pressure of railway tunnel under the geological conditions of high geostress and soft surrounding rock. Based on the in-situ measured geostress and construction monitoring displacement, the displacement around the tunnel unable to be monitored and the displacement before tunnel face were calculated according to the space effect in the excavation by benching tunneling method. Then, the final displacement of tunnel surrounding rock was forecasted by the improved BP artificial neural network model. The tunnel lining pressure and stress release rules were obtained by using the model for calculating the release ratio of excavation stress. The rules obtained by the above methods are generally consistent with the characteristic curves of classic surrounding rock and basically correspond with engineering experience and the state of site construction. The correctness and rationality of the above method under the geological conditions of high geostress and soft surrounding rock are validated by 3D numerical simulation using FLAC3D software. Both the calculation and simulation results indicate that the lining pressure at DyK307+900 is greater and the stress of the tunnel structure is in an unfavorable state because of the high geostress, soft surrounding rock and insufficient primary lining effect.关键词
高地应力/软弱围岩/位移/应力释放率/衬砌压力Key words
High geostress/Soft surrounding rock/Displacement/Release ratio of stress/Lining pressure分类
交通工程引用本文复制引用
陈志敏,赵德安,李国良,余云燕..高地应力软弱围岩铁路隧道的衬砌压力[J].中国铁道科学,2011,32(6):55-62,8.基金项目
铁道部科技研究开发计划项目(2008G030-A,2009G005-D) （2008G030-A,2009G005-D）
