| 基于现场测试的大跨扁平连拱隧道最佳支护时机研究 |
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| 引用本文： | 吴梦军,张永兴,刘新荣,李炘形.基于现场测试的大跨扁平连拱隧道最佳支护时机研究[J].水文地质工程地质,2012,39(1):53-57. |
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| 作者姓名： | 吴梦军 张永兴 刘新荣 李炘形 |
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| 作者单位： | 1重庆大学土木工程学院，重庆400045；2招商局重庆交通科研设计院有限公司，重庆400067； 3广东省肇庆市广贺高速公路有限公司，肇庆526200 |
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| 基金项目： | 广东省交通厅科技计划资助项目(2007-21) |
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| 摘 要： | 大跨扁平连拱隧道由于其开挖跨度大和断面扁平等特点，施工过程中围岩与结构的受力、变形同四车道连拱隧道或分离式隧道存在较大的差异，相应地影响到二次衬砌的最佳支护时机。以某六车道连拱隧道为依托工程，探讨了以隧道位移释放比为基本指标的支护时机确定方法，并通过对围岩位移与不同支护时机条件下二次衬砌内力的现场测试与综合分析，依据“支护抗力最小”的原则，提出了大跨扁平连拱隧道二次衬砌最佳施作时机。
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| 关 键 词： | 最佳支护时机 大跨扁平 连拱隧道 现场测试 |
A study of the optimal supporting time of large span and flat multi-arch tunnel based on site monitoring |
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| WU Meng-jun
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ZHANG Yong-xing
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LIU Xin-rong
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LI Xin-tong.A study of the optimal supporting time of large span and flat multi-arch tunnel based on site monitoring[J].Hydrogeology and Engineering Geology,2012,39(1):53-57. |
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| Authors: | WU Meng-jun ZHANG Yong-xing LIU Xin-rong LI Xin-tong |
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| Institution: | 1 College of Civil Engineering, Chongqing University, Chongqing400045, China； 2 Chongqing Communications Research & Design Institute, Chongqing400067, China; 3 Zhaoqing Guanghe Freeway Co. Ltd of Guangdong Province, Zhaoqing526200, China |
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| Abstract: | For the large span and section flat,the stress and distortion of the construction and surrounding rock for large span and flat multi-arch tunnel is differ from two-lane multi-arch tunnel or separated tunnel,optimal supporting time of secondary lining is influenced accordingly.Use the three-lane multi-arch tunnel for the supporting engineering,discuss the method use the displacement release ratio confirm the supporting time,and through site monitoring and synthesis analysis of surrounding rock displacement and secondary lining stress in difference supporting time,according to the principia of least supporting anti-stress,put forward the optimal supporting time of large span and flat multi-arch tunnel. |
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| Keywords: | optimal supporting time large span and flat multi-arch tunnel site monitoring |
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