1. College of Civil Engineering, Chongqing University, Chongqing 400045, China;
2. Key Laboratory of New Technology for Construction of China in Mountainous Area, Chongqing University, Chongqing 400030, China;
3. Changjiang Institute of Survey Planning Design and Research, Changjiang Water Resources Commission, Wuhan Hubei 430072, China
Deformation Behavior of Topographic Unsymmetrical Loaded Tunnels and Their Pre-reinforcements after Excavation
YANG Chao1, ZHANG Yong-xing1,2, HUANG Da1,2, ZHU Qian3
1. College of Civil Engineering, Chongqing University, Chongqing 400045, China;
2. Key Laboratory of New Technology for Construction of China in Mountainous Area, Chongqing University, Chongqing 400030, China;
3. Changjiang Institute of Survey Planning Design and Research, Changjiang Water Resources Commission, Wuhan Hubei 430072, China
摘要This study used FLAC to simulate the excavation of unsymmetrical loaded tunnels with various transversal gradients, surrounding rock grades, and thicknesses of side covering soil by considering all factors that affect these unsymmetrical loaded tunnels. The deformation behavior and displacements of key points were analyzed. The effects of unsymmetrical loading are negligible when the thickness of the side covering soil exceeds 21 m, and pre-reinforcement is needed prior to excavation when the thickness of the side covering soil is less than 15 m. These data were used in simulating tunnel pre-reinforcement in different conditions. Results indicate that in the condition of surrounding rocks V, a main problem is insufficient counter pressure in the shallow buried side when the thickness of the side covering soil is less than 7 m. By contrast, overpressure in the deep buried side needs to be addressed when the thickness of the side covering soil is more than 7 m. These findings were verified in actual practice. The conclusions of this study can be used as references to design and construct similar engineering projects.
Abstract：This study used FLAC to simulate the excavation of unsymmetrical loaded tunnels with various transversal gradients, surrounding rock grades, and thicknesses of side covering soil by considering all factors that affect these unsymmetrical loaded tunnels. The deformation behavior and displacements of key points were analyzed. The effects of unsymmetrical loading are negligible when the thickness of the side covering soil exceeds 21 m, and pre-reinforcement is needed prior to excavation when the thickness of the side covering soil is less than 15 m. These data were used in simulating tunnel pre-reinforcement in different conditions. Results indicate that in the condition of surrounding rocks V, a main problem is insufficient counter pressure in the shallow buried side when the thickness of the side covering soil is less than 7 m. By contrast, overpressure in the deep buried side needs to be addressed when the thickness of the side covering soil is more than 7 m. These findings were verified in actual practice. The conclusions of this study can be used as references to design and construct similar engineering projects.
基金资助:Supported by the National Natural Science Foundation of China (No.41172243);the China Postdoctoral Science Foundation (No.201003315);and the Program for Changjiang Scholars and Innovative Research Team in University (No.IRT1045)
通讯作者:
YANG Chao, vanni1010@yahoo.com.cn
E-mail: vanni1010@yahoo.com.cn
引用本文:
杨超, 张永兴, 黄达, 朱倩. 地形偏压隧道开挖变形特征及预加固措施研究[J]. Journal of Highway and Transportation Research and Development, 2013, 7(3): 69-75.
YANG Chao, ZHANG Yong-xing, HUANG Da, ZHU Qian. Deformation Behavior of Topographic Unsymmetrical Loaded Tunnels and Their Pre-reinforcements after Excavation. Journal of Highway and Transportation Research and Development, 2013, 7(3): 69-75.
[1] ZHU Wei-shen, LI Shu-cai,BAI Shi-wei,et a1. Some Developments of Principles for Construction Process Mechanics and Some Case History Studies[J]. Chinese Journal of Rock Mechanics and Engineering,2003,22(10):1586-1591. (in Chinese)
[2] LI Xiao-hong. NATM and In-sit-monitoring Technology of Tunnelling[M]. Beijing:China Science and Technology Press,2002. (in Chinese)
[3] YAO Yong,HE Chuan,XIE Zhuo-xiong. Study on Mechanical Behavior and Reinforcing Measures of Middle Rock Wall of Parallel Tunnel with Small Clear Space[J].Rock and Soil Mechanics,2007,28(9):1883-1888. (in Chinese)
[4] LI Ning,ZHANG Ping,YAN Jian-wen. Numerical Modeling of Grouting in Geoengineering[J]. Chinese Journal of Rook Mechanics and Engineering,2002,21(3):326-330. (in Chinese)
[5] SUN Yu-guo,HE Rong-kang,BAI Ji-cheng. Pre-consolidation Measure and Construction Method for Tunnel Portals under Complex Geological Condition[J]. World Tunnel,2000(3):13-18. (in Chinese)
[6] WANG Xiang-qiu,YANG Lin-de,GAO Wen-hua. Dynamic Monitoring and FEM Simulation Analysis of an Express-way Tunnel with Unsymmetrical Loadings[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(1):284-289. (in Chinese)
[7] AN Peng-cheng, CHEN Jian-ping, QIU Dao-hong. In-situ Monitoring and Stability Analysis of Surrounding Rock of Joint Arch Tunnels in Partial Pressure[J]. Journal of Jilin University:Earth Science Edition, 2008, 38(2):285-289. (in Chinese)
[8] DUAN Hai-peng,XU Gan-cheng,LIU Bao-guo. Analysis of Deformation of Surrounding Rock and Stress Characteristics of Supporting Structure of Fuxi Twin Tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(S2):3763-3768. (in Chinese)
[9] LIU Wen-bin,LIU Bao-guo,WANG Wei-feng. Pipe Shield Effect Analysis of Double-arched Tunnel under Unsymmetrical Pressures[J]. Chinese Journal of Rook Mechanics and Engineering,2007,26(S3):3704-3710.
[10] ZHAO Le-zhi,LIU Xiao-feng,QIAO Ning. Numerical Analysis on the Design of Unsymmetrically Loaded Tunnel[J]. Building Structure,2010,40(S1):409-411. (in Chinese)
[11] LAI Hong-peng,XIE Yong-li,YANG Xiao-hua. Treatment Effect Analysis of Shallow-buried Crushed Surrounding Rocks under Unsymmetrical Pressure Reinforced with Surface Pregrouting Technology in Highway Tunnel[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(11):2309-2315. (in Chinese)
[12] LIU Xiao-jun,ZHANG Yong-xing. Analysis of Unsymmetrically Loaded Tunnel according to Topographic Factors and Classification of the Surrounding Rocks[J]. Journal of Xi'an University of Architecture & Technology:Natural Science Edition,2010,42(2):205-209. (in Chinese)
[13] JTG D70-2004,Code for Design of Road Tunnel[S]. (in Chinese)
[14] XU Zheng-qi,LI Hai-bo. Technique Applied in the Short Clear-distance Tunnel Constructed by Shallow Foundation and Eccentric Compression[J]. Anhui Architecture,2007,(1):26-27. (in Chinese)
[15] ZHAI Zhen-long. Accessorial Construction Techniques of Large Section Soft Rock Shallow-buried Tunnel under Unsymmetrical Pressure[J]. Highway & Automotive Applications,2008, (9):134-136. (in Chinese)
[1]
谭仪忠, 刘元雪, 蔡守军, 王培勇, 陈愈龙. 浅埋隧道单侧扩建优化施工方案探讨[J]. Journal of Highway and Transportation Research and Development, 2019, 13(2): 45-55.
[2]
杨相如. 海底隧道衬砌混凝土高温后性能试验研究[J]. Journal of Highway and Transportation Research and Development, 2018, 12(3): 53-59.
[3]
肖大海, 谢全敏, 杨文东. 基于多变量的集成预测模型在隧道拱顶沉降变形预测中的应用[J]. Journal of Highway and Transportation Research and Development, 2018, 12(3): 46-52.
[4]
罗福君, 周晓军, 王媛, 张福麟. 框架型棚洞承受落石冲击力的模型试验研究[J]. Journal of Highway and Transportation Research and Development, 2018, 12(2): 59-66.
[5]
何忠明, 唐昊龙, 邓喜. 降雨工况下渗透力对粗粒土高路堤边坡稳定性的影响[J]. Journal of Highway and Transportation Research and Development, 2018, 12(1): 44-52.
[6]
肖旺, 郭全元, 苏永华. 考虑峰后特性的隧道围岩锚固力学效应[J]. Journal of Highway and Transportation Research and Development, 2017, 11(1): 49-58.
[7]
史晓花, 杜志刚, 周立平, 李平凡. 公路隧道中部视错觉减速标线优化研究[J]. Journal of Highway and Transportation Research and Development, 2016, 10(4): 63-70.
[8]
石钰锋, 罗青, 赵秀绍, 皮圣. 浅覆大跨度小净距隧道中岩墙及初支力学特性研究[J]. Journal of Highway and Transportation Research and Development, 2016, 10(3): 51-59.
[9]
胡俊, 王平. 含EPS颗粒夹层的隧道结构抗爆性能有限元分析[J]. Journal of Highway and Transportation Research and Development, 2016, 10(2): 53-58.
[10]
杨和平, 刘雄, 肖杰. 土工格栅反包加筋支护膨胀土堑坡的工作机理[J]. Journal of Highway and Transportation Research and Development, 2016, 10(1): 1-9.
[11]
邵良杉, 徐波. 基于因子分析与Fisher判别分析法的隧洞围岩分类研究[J]. Journal of Highway and Transportation Research and Development, 2015, 9(4): 50-57.
[12]
王如意, 闫倩倩, 田波, 谢晋德. 含湿量和纤维对隧道二衬混凝土高温性能的影响[J]. Journal of Highway and Transportation Research and Development, 2015, 9(3): 63-68.
[13]
汪波, 王杰, 吴德兴, 徐建强, 赵玉东. 让压支护技术在软岩大变形隧道中的应用探讨[J]. Journal of Highway and Transportation Research and Development, 2015, 9(3): 69-77.
[14]
宋克志, 李福献, 朱雷敏, 王梦恕. 隧道二衬结构受力影响因素的敏感性分析[J]. Journal of Highway and Transportation Research and Development, 2014, 8(4): 69-75.
[15]
石钰锋, 林辉, 阳军生, 徐长节. 软弱地层浅埋隧道加固范围及强度参数的研究[J]. Journal of Highway and Transportation Research and Development, 2014, 8(4): 76-81.
2013, Vol. 7 
