| 253 | 11 | 93 |
| 下载次数 | 被引频次 | 阅读次数 |
以实际深埋软岩引水隧洞施工为背景,在对导致大变形的围岩压力性质认识和力学行为分析的基础上,结合室内实验、数值模拟手段、施工变形监测数据和围岩—衬砌接触压力现场试验,研究了隧洞开挖后洞周位移分布特征、围岩变形和支护受力随时间发展规律。研究结论表明:(1)大主应力方向为垂直方向的高地应力环境中,隧洞软岩大变形以挤压型变形为主;(2)开挖面和二衬对约束隧洞空间位移分布具有重要作用;(3)软弱围岩变形发展和支护受力具有明显的流变特性和时间效应,及时施加二衬能有效限制流变变形的发展。在研究基础上提出了一些施工中有益于控制围岩稳定性的建议。
Abstract：Taking the construction of deeply buried diversion tunnel as the study background,the distribution characteristics of the peripheral displacement,surrounding rock deformation and time-dependant development law of supporting stress are studied in combination with the relevant lab-experiment,numerical simulation,measured data of monitoring on construction deformation and in situ test on surrounding rock-lining contact pressure based on the understanding of the property of surrounding rock pressure that causes large deformation and the analysis on the mechanical behavior concerned. The study result shows that( 1) within the environment of the high geo-stress with the major principal stress in a vertical direction,the larger deformation of soft rock is mainly the extrusion deformation;( 2) the excavating face and the secondary lining play important roles on constraining the spatial displacement distribution of tunnel;( 3) the development of soft surrounding rock deformation and the supporting stress have obvious rheological behaviors and time effects,and then placing the secondary lining can effectively restrict the development of the rheological deformation. On the basis of this study,some suggestions favorable to control the surrounding rock stability during construction are finally proposed as well.
[1]靳晓光,李晓红.高地应力区深埋隧道软弱围岩支护结构力学特性研究[J].公路交通科技,2008,25(2):102-104.
[2]关宝树.隧道力学概论[M].成都:西南交通大学出版社,1993.
[3]胡元芳,刘志强,王建宇.高地应力软岩条件下挤压变形预测及应用[J].现代隧道技术,2011,48(3):28-33.
[4]陶波,伍法权,郭啟良,等.高地应力环境下乌鞘岭深埋长隧道软弱围岩流变规律实测与数值分析研究[J].岩石力学与工程学报,2006,25(9):1828-1834.
[5]GB 50218—94,工程岩体分级标准[S].
[6]TERZAGHI K.Rock defects and loads in tunnel support[C]//Rock Tunneling with Steel Supports[S.L.]:[s.n.],1946:17-99.
[7]张志强,关宝树.软弱围岩隧道在高地应力条件下的变形规律研究[J].岩土工程学报,2000,22(6):696-700.
[8]王建宇,胡元芳,刘志强.高地应力软弱围岩隧道挤压型变形[J].现代隧道技术,2012,49(3):9-17.
[9]邵珠山,李晓照,陈福成,等.大跨软岩公路隧道围岩稳定性分析[J].地下空间与工程学报,2012,8(6):1221-1227.
[10]孙钧,潘晓明.隧道软弱围岩挤压大变形非线性[J].岩石力学与工程学报,2012,31(10):1957-1968.
[11]Giovanni Barla G.Tunnelling under Squeezing Rock Conditions[R].Department of Structural and Geotechnical Engineering,Politecnico di Torino.
[12]Evert Hoek,Paul Marinos.Predicting Tunnel Squeezing Problems in Weak Heterogeneous Rock Masses[J].Tunnels and Tunnelling International,2000.
[13]汪小敏,黄宏伟,谢雄耀.软弱围岩隧道施工三维有限元分析[J].地下空间与工程学报,2007,3(6):1114-1118.
[14]胡文清,郑颖人,钟昌云.木寨岭隧道软弱围岩段施工方法及数值分析[J].地下空间,2004,24(2):194-197.
[15]谢锋,蒋树屏,李建军.蠕变围岩隧道二衬支护时间的研究[J].地下空间与工程学报,2006,2(5):805-808.
[16]李廷春.毛羽山隧道高地应力软岩大变形施工控制技术[J].现代隧道技术,2011,48(2):59-66.
[17]BARLA G,BORGNA S.Squeezing behaviour of tunnels:a phenomenological approach[J].Gallerie,1999,58(1):39-60.
[18]LEE E H.Elastic-plastic deformation at finite strains[J].Journal of Applied Mechanics,1969,36(1):1-6.
[19]孙钧,潘晓明,王勇.隧道软弱围岩挤入型大变形预测与工程应用研究[J].河南大学学报:自然科学版,2012(9):1-13.
基本信息:
DOI：10.13928/j.cnki.wrahe.2014.02.025
中图分类号:TV554
引用信息:
[1]周泽林,陈寿根,李岩松,等.高地应力环境下引水隧洞软弱围岩稳定性分析[J].水利水电技术,2014,45(02):87-92.DOI:10.13928/j.cnki.wrahe.2014.02.025.
基金信息:
中央高校基本科研业务费专项资金资助(SWJTU11ZT33);; 教育部创新团队发展计划资助(IRT0955)