Visco-Elasto-Plastic Back Analysis on Yunling Tunnel in Weak Rock
-
摘要: 软弱隧道围岩在工程实际和试验研究中都表现出较强的流变性质, 容易造成围岩的过大变形而导致失稳.按新奥法施工原则对云岭隧道左洞进口段的软弱围岩段开挖过程进行监测, 分析初期围岩位移收敛值以及二次支护和衬砌的压力变化情况, 通过黏弹性有限元反分析理论, 建立基于黏弹塑性的反分析体系, 对围岩参数进行反演和优化.通过采用ANSYS有限元程序模拟开挖过程, 并将现场实际量测值与计算数据进行比较, 为隧道支护设计和施工的安全可靠性提供科学依据和技术指导.Abstract: Weak rock tunnel in the engineering practice and experiment research have shown strong, easy to cause the rheological properties of rock deformation caused by excessive instability. We established anti-analysis system based on viscoelastic finite element method theory by monitoring the weak surrounding rock excavation process of Yunling left cave entrance according to the New Austria Tunneling Method and analyzing the initial value of surrounding rock displacement convergence and secondary support and lining of the pressure changes. By using ANSYS finite element program, the excavation process was simulated, and the actual field measured values were compared with the calculated data. The study provides a scientific basis and technical guidance for support design and construction of tunnel with safety and reliability.
-
Key words:
- weak rock /
- continuous monitoring /
- FEM simulation /
- back analysis
-
图 1 平面测点与量测元件的布置
○拱顶下沉点；▎混凝土、钢结构应变计；A，B，C收敛基线端点
Fig. 1. Distribution of measuring points
图 2 初期支护位移曲线(a)和应力曲线(b)
Fig. 2. Displacement-time curve (a) and Stress-time curve (b) of initial lining
图 3 钢拱架支撑(a)和二次衬砌(b)应力曲线
Fig. 3. Stress-time curve of steel bow member (a) and secondary lining (b)
图 5 初期支护轴力(a)和弯矩(b)
Fig. 5. Diagram of initial lining axial force (a) and bending moment (b)
图 6 初期支护阶段围岩位移云图(a)和初期支护阶段围岩等效应力云图(b)
Fig. 6. Displacement nephogram of surrounding rock (a) and equivalent stress nephogram of surrounding (b) during initial supporting stage
图 7 各测线相对计算位移与实测位移
Fig. 7. Relative calculated and measured displacement along every measured line
表 1 反演结果与实测值
Table 1. Results of optimum design and inversion
反演参数 σi(MPa) λ E2(GPa) μ2(Pa·s) E1(GPa) 参数范围 10~20 0.5~2.0 2.5~4 1.0e15~1.0e17 - 真实值 15.0 1.3 3.5 1.0e16 - 反演值 15.8 1.36 3.4 1.1e16 3.6 误差 5.3% 4.6% 2.9% 10% - 相关系数 0.960 7 
下载: 导出CSV
表 2 位移实测值与计算值对比(mm)
Table 2. Comparison between calculating results and monitoring data of displacement
量测项目 拱顶下沉 A-B基线 A-C基线 B-C基线 实测值 5.73 4.67 3.87 6.07 计算值 8.91 4.52 5.83 7.47
下载: 导出CSV
-
Dai, G.F., Ying, S., Xia, C.C., et al., 2004. The monitor measuring of highway tunnel in natm. Journal of Chongqing University (Natural Science Editon), 27(2): 132-135, 166 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-FIVE200402033.htm Huang, H.W., 2001. Development and prospect of urban tunnel and underground construction. Underground Space, 21(4): 311-317 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-BASE200104010.htm Lee, K.M., Rowe, R.K., 1991. An analysis of three-dimensional ground movements: the Thunder Bay tunnel. Canadian Geotechnical. Tournal, 28(1): 25-41. doi: 10.1139/t91-004 Li, Y.S., Li, X.P., Dai, Y.F., et al., 2007. Mechanical property testing and numerical calculating on surrounding rock mass and support system of tunnel. Rock and Soil Mechanics, 28(7): 1348-1352, 1358 (in Chinese with English abstract). http://www.researchgate.net/publication/291665713_Mechanical_property_testing_and_numerical_calculating_on_surrounding_rock_mass_and_support_system_of_tunnel Liu, B.G., Qiao, C.S., 2004. Back analysis of visco-plastic model parameters of rock mass. Engineering Mechanics, 21(4): 118-122 (in Chinese with English abstract). http://d.wanfangdata.com.cn/Periodical_gclx200404021.aspx Peck, R.B., 1969. Deep excavations and tunneling in soft ground. Proc 7th International Conference on Soil Mech and Foundation Engineering, Mexico. Qiu, D.H., Chen, J.P., Xiao, Y.H., et al., 2009. Study of rockburst prediction of separated tunnel excavated asynchronoushy. Rock and Soil Mechanics, 30(2): 515-520 (in Chinese with English abstract). http://www.researchgate.net/publication/289780204_Study_of_rockburst_prediction_of_separated_tunnel_excavated_asynchronoushy Soliman, E., Duddeck, H., Ahrens, H., 1993. Two and three dimensional analysis of closely spaced double-tube tunnels. Tunnelling and Underground Space Technology, 8(1): 13-18. doi: 10.1016/0886-7798(93)90130-N Wang, J., Cao, P., Lin, H., 2009. Numerical analysis of slope reinforcement with effect of bias tunnel. Journal of Highway and Transportation Research and Development, 26(9): 102-106 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-GLJK200909020.htm Wang, X.Q., Yang, L.D., Gao, W.H., 2005. Dynamic monitoring and fem simulation analysis of an expressway tunnel with unsymmetrical loadings. Chinese Journal of Rock Mechanics and Engineering, 24(2): 284-289 (in Chinese with English abstract). Wu, G.P., Wang, R.F., 2000. Ressearch of back analysis on underground structures. Journal of Hehai University (Natural Sciences), 28(1): 76-80 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-HHDX200001015.htm Yang, J.H., Chen, J.Q., He, G., et al., 2005, Research on monitoring and measuring of sandy clay tunnel construction under complex conditions. Chinese Journal of Rock Mechanics and Engineering, 24(24): 4588-4593 (in Chinese with English abstract). http://www.researchgate.net/publication/287721463_Research_on_monitoring_and_measuring_of_sandy_clay_tunnel_construction_under_complex_conditions 代高飞, 应松, 夏才初, 等, 2004. 高速公路隧道新奥法施工监控量测. 重庆大学学报(自然科学版), 27(2): 132-135, 166. https://www.cnki.com.cn/Article/CJFDTOTAL-FIVE200402033.htm 黄宏伟, 2001. 城市隧道与地下工程的发展与展望. 地下空间, 21(4): 311-317. doi: 10.3969/j.issn.1673-0836.2001.04.011 李元松, 李新平, 代冀飞, 等, 2007. 隧道围岩与衬砌受力特性测试与数值分析. 岩土力学, 28(7): 1348-1352, 1358. doi: 10.3969/j.issn.1000-7598.2007.07.012 刘保国, 乔春生, 2004. 岩体粘塑性模型参数的反分析. 工程力学, 21(4): 118-122. doi: 10.3969/j.issn.1000-4750.2004.04.021 邱道宏, 陈剑平, 肖云华, 等, 2009. 分离式隧道非同步开挖岩爆预测研究. 岩土力学, 30(2): 515-520. doi: 10.3969/j.issn.1000-7598.2009.02.040 王军, 曹平, 林杭, 2009. 受偏压隧道影响边坡加固的数值分析. 公路交通科技, 26(9): 102-106. doi: 10.3969/j.issn.1002-0268.2009.09.020 王祥秋, 杨林德, 高文化, 2005. 高速公路偏压隧道施工动态监测与有限元仿真模拟. 岩石力学与工程学报, 24(2): 284-289. doi: 10.3321/j.issn:1000-6915.2005.02.017 吴国平, 王润富, 2000. 地下工程反分析的研究. 河海大学学报(自然科学版), 28(1): 76-80. doi: 10.3321/j.issn:1000-1980.2000.01.016 杨金虎, 陈家清, 何刚, 等, 2005. 复杂环境条件下砂质粘土隧洞施工监控量测研究. 岩石力学与工程学报, 24(24): 4588-4593. doi: 10.3321/j.issn:1000-6915.2005.24.031 -
点击查看大图
计量
- 文章访问数: 3189
- HTML全文浏览量: 609
- PDF下载量: 51
- 被引次数: 0
