层理位置对近水平软硬互层隧道变形的影响
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摘要
江习高速四面山隧道软硬互层围岩为近水平岩层,弹性模量比值为1∶5,黏聚力比值为1∶4,层理效应明显,且层理与隧道相对位置不一,对隧道开挖影响也不同。以砂泥互层V级围岩隧道施工段为工程依托,采用接触分析方法,研究层理与隧道相对位置关系对隧道变形影响,并进行变形预测,得出以下结论:(1)隧道开挖后,其拱顶沉降相对水平收敛变化更大,层理层间滑移相对层间剥离变化更明显。(2)隧道拱顶沉降受隧道上方层理影响最大,水平收敛受穿隧道层理影响最大,底鼓受隧道下方层理影响最大。(3)对于层理本身,隧道开挖对断面以上位置的层理影响更大,对其下方层理影响较小,层理位于隧道上方层理滑移最大,层理穿越隧道断面时层间剥离量最大。研究成果可在类似隧道提出针对性施工工艺设计建议并推广应用。
Some sections in Simianshan Tunnel,Jiangxi highway,are surrounded by of soft-hard interbed rock.The elastic modulus ratio of soft and hard rock is 1∶ 5,cohesive force ratio is 1∶ 4. The bedding effect of the rock mass is remarkable,different relative positions between the bedding and tunnel result in different influence on the tunnel excavation. Making use of contact analysis method,the relationship between bedding and its relative location with tunnel is studied,and the tunnel deformation is predicted. The results show that:(1)After the tunnel excavation,the vault sink value is larger than the level convergence of the surrounding rock. At the same time,the change of the bedding sliding is more obvious than stripping.(2)The vault sink is the largest when the bedding is above the tunnel,while the level convergence is the largest when the bedding is cross the tunnel and the tunnel floor heave is the largest when the bedding is under the tunnel.(3)For bedding itself,it has the largest effect on the above bedding deformation when the tunnel excavated,while it is smaller when the bedding is under the tunnel. Interlayer sliding is the largest when the bedding is above the tunnel,and the stripping is the largest when the bedding cross the tunnel. Research results provide a good model for the similar tunnel construction and put forward construction design suggestions.
Some sections in Simianshan Tunnel,Jiangxi highway,are surrounded by of soft-hard interbed rock.The elastic modulus ratio of soft and hard rock is 1∶ 5,cohesive force ratio is 1∶ 4. The bedding effect of the rock mass is remarkable,different relative positions between the bedding and tunnel result in different influence on the tunnel excavation. Making use of contact analysis method,the relationship between bedding and its relative location with tunnel is studied,and the tunnel deformation is predicted. The results show that:(1)After the tunnel excavation,the vault sink value is larger than the level convergence of the surrounding rock. At the same time,the change of the bedding sliding is more obvious than stripping.(2)The vault sink is the largest when the bedding is above the tunnel,while the level convergence is the largest when the bedding is cross the tunnel and the tunnel floor heave is the largest when the bedding is under the tunnel.(3)For bedding itself,it has the largest effect on the above bedding deformation when the tunnel excavated,while it is smaller when the bedding is under the tunnel. Interlayer sliding is the largest when the bedding is above the tunnel,and the stripping is the largest when the bedding cross the tunnel. Research results provide a good model for the similar tunnel construction and put forward construction design suggestions.
引文
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5光新军,陈曾伟,刘修善,等.三向应力状态下层理性泥页岩地层井壁稳定性研究.科学技术与工程,2015;15(5):54-57Guang Xinjun,Chen Zengwei,Liu Xiushan,et al.Well stability study for laminated mud shale formations in three-stress state.Science Technology and Engineering,2015;15(5):54-57
6 Zhao C,Lavasan A A,Barciaga T,et al.Model validation and calibration via back analysis for mechanized tunnel simulations-the Western Scheldt Tunnel case.Computers&Geotechnics,2015;69(7):601-614
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8王祥秋,杨林德,高文华.含软弱夹层层状围岩地下洞室平面非线性有限元分析.岩土工程学报,2002;24(6):729-732Wang Xiangqiu,Yang Linde,Gao Wenhua.2-D nonlinear FEM analysis for underground openings located in the layered rock mass with softening joints.Chinese Journal of Geotechnical Engineering,2002;24(6):729-732
9李炎延,郑颖人,康楠.隧洞稳定性影响因素的敏感性分析.地下空间与工程学报,2015;11(2):491-498Li Yanyan,Zheng Yingren,Kang Nan.Sensitivity analysis on influencing factors of tunnel stability.Chinese Journal of Underground Space and Engineering,2015;11(2):491-498
10王启耀,杨林德,赵法锁.陡倾角层状岩体中地下洞室围岩的变形.长安大学学报(自然科学版),2006;26(5):69-73Wang Qiyao,Yang Linde,Zhao Fasuo.Deformation of huge underground opening excavated in layered rock mass with steep deep angle.Journal of Chang'an University(Natural Science),2006;26(5):69-73
11单仁亮,杨昊,王述红,等.节理化岩质边坡开挖稳定性分析及支护方案设计.地下空间与工程学报,2015;11(4):1016-1022Shan Renliang,Yang Hao,Wang Shuhong,et al.Stability analysis on jointed rock slope excavation and design of strengthening scheme.Chinese Journal of Underground Space and Engineering,2015;11(4):1016-1022
12闫月龙,徐涛,任思玉,等.节理产状对岩石单轴抗压强度的影响研究.地下空间与工程学报,2016;(4):897-903Yan Yuelong,Xu Tao,Ren Siyu,et al.Study on the influence of joints occurrence on uniaxial compressive strength of rock.Chinese Journal of Underground Space and Engineering,2016;(4):897-903
13梁正召,唐春安,李厚祥,等.单轴压缩下横观各向同性岩石破裂过程的数值模拟.岩土力学,2005;26(1):57-62Liang Zhengzhao,Tang Chun'an,Li Houxiang,et al.A numerical study on failure process of transversely isotropic rock subjected to uniaxial compression.Rock and Soil Mechanics,2005;26(1):57-62
14杜文.双线铁路隧道平缓砂泥岩互层围岩变形机理分析.现代隧道技术,2012;49(4):22-25Du Wen.Analysis of the surrounding rock deformation mechanism of a gently inclined sand and mudstone interbed in a double-track railway tunnel.Modern Tunnelling Technology,2012;49(4):22-25
15杨斌,方勇,王小敏.近水平软硬互层围岩公路隧道初期支护内力分析.重庆交通大学学报(自然科学版),2013;32(2):229-233,343Yang Bin,Fang Yong,Wang Xiaomin.Force analysis on highway tunnel's primary support in approximate horizontal inter-bedded strata of soft and hard rock.Journal of Chongqing Jiaotong University(Natural Science),2013;32(2):229-233,343
16李妍.基于ANSYS软件的接触问题分析及在工程中的应用.长春:吉林大学,2004Li Yan.The contact element analysis and application in engineering based on the ANSYS software.Changchun:Jilin University,2004
2孙广忠.岩体结构力学.北京:科学出版社,1988Sun Guangzhong.Structural mechanics of rock mass.Beijing:Science Press,1988
3周建昆,吴坚.岩石公路隧道塌方风险事故树分析.地下空间与工程学报,2008;4(6):991-998Zhou Jiankun,Wu Jian.Fault tree analysis of the collapse risk in rock highway tunnel.Chinese Journal of Underground Space and Engineering,2008;4(6):991-998
4周海亮,王丛泉.水平互层围岩隧道施工技术.全国地下、水下工程技术交流会.北京:施工技术编辑部,2013:136-139Zhou Hailiang,Wang Congquan.Construction technology of horizontal surrounding rock tunnel.The National Underground and Underwater Engineering Technology Exchange Meeting.Beijing:Construction Technology Press,2013:136-139
5光新军,陈曾伟,刘修善,等.三向应力状态下层理性泥页岩地层井壁稳定性研究.科学技术与工程,2015;15(5):54-57Guang Xinjun,Chen Zengwei,Liu Xiushan,et al.Well stability study for laminated mud shale formations in three-stress state.Science Technology and Engineering,2015;15(5):54-57
6 Zhao C,Lavasan A A,Barciaga T,et al.Model validation and calibration via back analysis for mechanized tunnel simulations-the Western Scheldt Tunnel case.Computers&Geotechnics,2015;69(7):601-614
7赵文忠,黄生文,刘丹.大跨径隧道围岩的快速分级与稳定性分析.地下空间与工程学报,2015;11(2):1-4Zhao Wenzhong,Huang Shengwen,Liu Dan.Rapid classification and stability analysis of surrounding rock in large-span tunnel.Chinese Journal of Underground Space and Engineering,2015;11(2):1-4
8王祥秋,杨林德,高文华.含软弱夹层层状围岩地下洞室平面非线性有限元分析.岩土工程学报,2002;24(6):729-732Wang Xiangqiu,Yang Linde,Gao Wenhua.2-D nonlinear FEM analysis for underground openings located in the layered rock mass with softening joints.Chinese Journal of Geotechnical Engineering,2002;24(6):729-732
9李炎延,郑颖人,康楠.隧洞稳定性影响因素的敏感性分析.地下空间与工程学报,2015;11(2):491-498Li Yanyan,Zheng Yingren,Kang Nan.Sensitivity analysis on influencing factors of tunnel stability.Chinese Journal of Underground Space and Engineering,2015;11(2):491-498
10王启耀,杨林德,赵法锁.陡倾角层状岩体中地下洞室围岩的变形.长安大学学报(自然科学版),2006;26(5):69-73Wang Qiyao,Yang Linde,Zhao Fasuo.Deformation of huge underground opening excavated in layered rock mass with steep deep angle.Journal of Chang'an University(Natural Science),2006;26(5):69-73
11单仁亮,杨昊,王述红,等.节理化岩质边坡开挖稳定性分析及支护方案设计.地下空间与工程学报,2015;11(4):1016-1022Shan Renliang,Yang Hao,Wang Shuhong,et al.Stability analysis on jointed rock slope excavation and design of strengthening scheme.Chinese Journal of Underground Space and Engineering,2015;11(4):1016-1022
12闫月龙,徐涛,任思玉,等.节理产状对岩石单轴抗压强度的影响研究.地下空间与工程学报,2016;(4):897-903Yan Yuelong,Xu Tao,Ren Siyu,et al.Study on the influence of joints occurrence on uniaxial compressive strength of rock.Chinese Journal of Underground Space and Engineering,2016;(4):897-903
13梁正召,唐春安,李厚祥,等.单轴压缩下横观各向同性岩石破裂过程的数值模拟.岩土力学,2005;26(1):57-62Liang Zhengzhao,Tang Chun'an,Li Houxiang,et al.A numerical study on failure process of transversely isotropic rock subjected to uniaxial compression.Rock and Soil Mechanics,2005;26(1):57-62
14杜文.双线铁路隧道平缓砂泥岩互层围岩变形机理分析.现代隧道技术,2012;49(4):22-25Du Wen.Analysis of the surrounding rock deformation mechanism of a gently inclined sand and mudstone interbed in a double-track railway tunnel.Modern Tunnelling Technology,2012;49(4):22-25
15杨斌,方勇,王小敏.近水平软硬互层围岩公路隧道初期支护内力分析.重庆交通大学学报(自然科学版),2013;32(2):229-233,343Yang Bin,Fang Yong,Wang Xiaomin.Force analysis on highway tunnel's primary support in approximate horizontal inter-bedded strata of soft and hard rock.Journal of Chongqing Jiaotong University(Natural Science),2013;32(2):229-233,343
16李妍.基于ANSYS软件的接触问题分析及在工程中的应用.长春:吉林大学,2004Li Yan.The contact element analysis and application in engineering based on the ANSYS software.Changchun:Jilin University,2004