广梧高速公路隧道二衬合理支护时机确定方法  

The Method Used to Determine Reasonable Support Time of the Guang-Wu Highway

作　　者：夏才初[1,2] 卞跃威[1,2] 彭裕闻[1,2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《西部交通科技》2009年第12期1-5,共5页Western China Communications Science & Technology

摘　　要：文章以广梧高速公路为工程背景,介绍采用以隧道拱顶下沉及周边收敛的收敛速率作为判定标准的经验法,来确定隧道围岩的二衬合理支护时机。通过现场实际监测结果分析,确定了Ⅱ、Ⅲ、Ⅳ、Ⅴ级围岩相应的收敛趋于稳定时的掌子面推进时间与距离,为这四种级别围岩的二衬合理支护时机的确定提供依据。Based on the Guang-Wu highway construction background, we analyzed how the experience method, which used tunnel sinking and surrounding convergence rate as criterion, determined the supporting time for tunnel wall rock.By using the monitoring data collected from the field, the article concludes the timedistance when/where Ⅱ, Ⅲ, Ⅳ, Ⅴ grade wall rock＇s convergence tends to be stable,which also provides the basis for reasonable supporting time for these four grades wall rock.

关 键 词：隧道工程 合理支护时机 经验法 拱顶下沉 周边收敛 收敛速率 

分 类 号：U455[建筑科学—桥梁与隧道工程]