摘要
在软弱围岩中,作为主要承载结构和最后一道防水线的二次衬砌的支护时间至关重要[1]。若支护时间过早,衬砌因围岩蠕变的影响将产生较大的变形和所承受的荷载较大,从而出现破坏现象;若支护时间过晚,围岩因蠕变的影响产生较大的位移而失稳,从而引发跨塌等工程事故。因此,对蠕变围岩隧道的二次衬砌支护时间的研究具有重要的工程意义。文章应用蠕变损伤理论,从应变的角度得出二次衬砌合理的的支护时间,对隧道工程的设计、施工具有一定的指导意义。
In the soft adjacent rock, the support time of quadric liner as the main loading structure and the last water-proof line is very important. If the support time is quite early, a large deformation would appear for the liner and there will be a large load. So, the liner construction would be broken easily. If the support time is very late, for the adjacent rock a large displacement would arise because of the influence of creeping. And destabilization appears and collapsing initiates for the adjacent rock. Therefore, the research on the quadric liner time for creeping adjacent rock tunnel has great significance for the engineering. In this paper, applying the creeping impairment theory, the reasonable support time is gained, which has guiding significance for designing and construction.
出处
《地下空间与工程学报》
CSCD
2006年第5期805-808,共4页
Chinese Journal of Underground Space and Engineering
关键词
隧道工程
围岩
蠕变
二次衬砌
支护时间
tunneling
adjacent rock
creeping
quadric liner
support time
