高速公路隧道开挖围岩变形测试分析

DEFORMATION TEST ANALYSIS OF SURROUNDING ROCK OF NEW AUSTRIAN TUNNELING TUNNEL ON EXPRESSWAY

随着高速公路网的不断完善,山区修建高速公路时有发生。考虑山区复杂地质条件,探索山区公路隧道围岩的变形特性,达到评估其围岩整体稳定性目的,一直是工程界面临的主要课题之一。基于此考虑,依托某高速公路隧道工程为背景,采用现场测试方法,对隧道开挖面洞口围岩收敛和拱顶位移测试数据进行分析,并在此基础上对累积20年围岩变形规律进行预测。结果表明,公路隧道拱顶位移和围岩收敛随时间变化均呈快速、缓慢和稳定增长状态,其中拱顶位移控制在5mm以内,围岩收敛控制在2.5mm以内;围岩变形在建设期基本完成,建设期测试累积变形约占20年预测累积变形的90%以上。隧道围岩变形相对较小,验证其整体稳定性较高,研究成果能够为类似工程实践提供参考。

With the continuous improvement of the highway network, the mountain construction of the highway has occurred. Considering the complex geological conditions in mountainous areas and ex- ploring the deformation characteristics of surrounding rock of mountainous highway tunnels, it is one of the main problems facing the engineering community to evaluate the stability of the surrounding rock. Based on this consideration, based on the background of a highway tunnel project, the field test method is used to analyze the convergence of the surrounding rock and the arch displacement test data of the ex- cavation face tunnel. On this basis, prediction. The results show that the displacement of the dome and the convergence of the surrounding rock are rapid, slow and steady, and the displacement of the vault is controlled within 5mm, and the convergence of the surrounding rock is controlled within 2. 5mm. The deformation of the surrounding rock is basically completed, the construction period of cumulative cumu- lative deformation of about 20 years predicted cumulative deformation of more than 90%. The deforma- tion of the surrounding rock is relatively small, and its overall stability is verified. The research results can provide reference data for similar engineering practice.