盘道岭隧洞围岩位移变形监测与分析

摘要

The defective and dangerous tunnels have become increasingly prominent such as lining structure deformation,cracks and so on at Pand-aoling. The research selected monitoring sections in focus dangerous tunnel section,built deformation monitoring system and monitored the rock crawling deformation of the tunnel by buried Multipoint Displacement Meter. The displacement surrounding rock,temperature and strain lining structure with correlation time of Pandaoling tunnel show that the overall negative correlation between strain of lining structure and displacement of surrounding rock in monitoring period,but the correlation is lower,with temperature have positive correlation,and the correlation over the high. It's indicating that the short-term monitoring of strain lining structure dominated mainly by the impact of the temperature effect. Therefore,it should strengthen the long-term monitoring of the different parts and depth of the tunnel rock creep deformation characteristics and predict the creep of rock lining structural stability conditions and trends.%盘道岭隧洞衬砌结构变形、裂缝等病害问题日益突出，在重点病险洞段选取监测断面，构建变形监测系统，埋设多点位移计、应变计，进行隧洞围岩蠕动变形及衬砌结构应变监测。隧洞围岩位移、温度与衬砌结构应变随时间的相关关系表明，监测期内衬砌结构应变与围岩位移整体呈负相关、但相关性较弱，与温度呈正相关且相关性较强，说明监测短期内衬砌结构应变主要受温度效应影响。盘道岭隧洞围岩存在的蠕变变形是一个较为缓慢的过程，且多点位移计部分测点位移量与衬砌结构应变变化表现出一定相关性，围岩蠕动变形势必导致衬砌结构病害不断加剧。因此，应加强不同部位、深度隧洞围岩蠕动变形的长期监测，预判围岩蠕变对衬砌结构稳定状况的影响及发展趋势。