【摘要】 结合沈大高速公路改扩建工程金州单洞四车道公路隧道施工现场监测,对大跨度隧道开挖岩体变形的规律进行了探讨,揭示了大跨度隧道开挖后围岩失稳的原因,强调进行现场稳定性监测的必要性,阐明了锚喷网支护对于改善围岩受力状况、提高围岩自身承载力的本质,指出在大跨度公路隧道施工中必须坚持监控量测与主动控制的原则,以确保隧道施工的安全和质量.更多还原

【Abstract】 According to the measurement during excavation of Jinzhou tunnel with four lanes in one cave which lies on the rebuilt highway from Shenyang to Dalian,this paper analyzes the rock deformation rule,discusses the reason of instability after a highway tunnel was excavated,emphasizes the necessity of the construction stability monitor and active control.The importance of support is Fresented with bolts and shotcrete to improve and enhance the carrying capability of the rock.It is necessary to insist on the rule of measurement and active control to ensure the safety and quality of tunnel construction.更多还原