考虑流-固耦合的隧道开挖数值模拟
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摘要
根据隧道工程施工实际情况和地下水渗流的基本规律,以及弹塑性力学理论,建立了在应力场和渗流场耦合作用下隧道开挖数学模型,借助Comsol模拟了隧道开挖过程中围岩应力场及渗流场的变化规律。研究结果表明:在原岩开挖时,隧道围岩变形及地面沉降大,不利于周围建筑的安全,隧道内积水,施工无法进行;进行灌浆处理后,围岩变形小,地面沉降得到控制,有利于施工及周围建筑的安全。
According to the execution situation of the tunnel project,the theory of elastoplastic mechanics and the seepage law of groundwater are taken into account;a mathematical model considering seepage-stress coupling of the tunnel is established;seepage and the stress field around the tunnel in different working states are simulated by applying Comsol.The results indicate that during the process of excavation without any measures,deformation of the soil around the tunnel occurs;the deformation of the rock and the settlement of the ground are large;the buildings nearby are in danger and the groundwater infiltrates into the tunnel;the project can't be conducted;after grouting,the deformation of the rock around the tunnel is reduced and the settlement of the ground is controlled;then the buildings nearby are safe and the tunnel excavation can be processed safely.
According to the execution situation of the tunnel project,the theory of elastoplastic mechanics and the seepage law of groundwater are taken into account;a mathematical model considering seepage-stress coupling of the tunnel is established;seepage and the stress field around the tunnel in different working states are simulated by applying Comsol.The results indicate that during the process of excavation without any measures,deformation of the soil around the tunnel occurs;the deformation of the rock and the settlement of the ground are large;the buildings nearby are in danger and the groundwater infiltrates into the tunnel;the project can't be conducted;after grouting,the deformation of the rock around the tunnel is reduced and the settlement of the ground is controlled;then the buildings nearby are safe and the tunnel excavation can be processed safely.
引文
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[14]唐杰军,凌同华.山区公路分离式隧道围岩流固耦合数值分析[J].矿业研究与开发,2009,29(6):24-26.TANG Jie-jun,LING Tong-hua.Numerical simulation on surrounding rock of separated highway tunnels based on fluid-solid interaction[J].Mining Research and Development,2009,29(6):24-26.
[15]GU C S,SU H Z,ZHOU H.Study of coupling model of seepage field and stress-field for rolled control concrete dam[J].Applied Mathematics and Mechanics(English Edition),2005,26(3):355-363.
[16]薛强,梁冰,马士进.边坡失稳系统的固流耦合模型[J].山东科技大学学报(自然科学版),2001,20(2):87-89.XUE Qiang,LIANG Bing,MA Shi-jin.Solid-fluid coupling model of the system of slope failure[J].Journal of Shandong University of Science and Technology(Natural Science),2001,20(2):87-89.
[17]SMINTH I M,GRIFFITHS D V.有限元方法编程(第3版)[M].王菘,周坚鑫,王来,等译.北京:电子工业出版社,2003.
[2]苑莲菊,李振全,武胜忠,等.工程渗流力学及应用[M].北京:中国建材工业出版社,2001.
[3]李廷春,李术才,陈卫忠,等.考虑水的耦合与否在隧道稳定计算中造成的结果差异对比[J].岩石力学与工程学报,2003,22(增刊1):2159-2163.LI Ting-chun,LI Shu-cai,CHEN Wei-zhong,et al.Comparison of computing results with and without water coupled in simulation on subsea tunnel stability[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(Supp.1):2159-2163.
[4]李廷春,李术才,陈卫忠,等.厦门海底隧道的流固耦合分析[J].岩土工程学报,2004,26(3):397-401.LI Ting-chun,LI Shu-cai,CHEN Wei-zhong,et al.Coupled fluid-mechanical analysis of Xiamen subsea tunnel[J].Chinese Journal of Geotechnical Engineering,2004,26(3):397-401.
[5]陈卫忠,于洪丹,郭小红,等.厦门海底隧道海域风化槽段围岩稳定性研究[J].岩石力学与工程学报,2008,27(5):873-884.CHEN Wei-zhong,YU Hong-dan,GUO Xiao-hong,et al.Study of stabilities of surrounding rocks through weathered slot in Xiamen subsea tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(5):873-884.
[6]彭海阔,孟光,丁麒,等.在地震激励下动水压力对沉管隧道的影响[J].上海交通大学学报,2008,42(6):1027-1031.PENG Hai-kuo,MENG Guang,DING Qi,et al.The influence of hydrodynamic pressure on immersed tunnel under earthquake excitation[J].Journal of Shanghai Jiaotong University,2008,42(6):1027-1031.
[7]严绍洋,李亮辉,高燕希,等.公路隧道开挖渗流场的有限差分法分析[J].中外公路,2007,27(6):120-123.
[8]赵建宇.清水隧道围岩稳定性流固耦合研究[J].岩土工程技术,2007,21(5):257-263.ZHAO Jian-yu.Fluid-solid coupling analysis of Qingshui railway tunnel[J].Geotechnical Engineering Technique,2007,21(5):257-263.
[9]裴桂红,吴军,刘建军,等.深基坑开挖过程中渗流一应力祸合数值模拟[J].岩石力学与工程学报,2004,23(增刊2):4975-4978.PEI Gui-hong,WU Jun,LIU Jian-jun,et al.Numerical modeling of seepage-stress coupling of deep foundation pit excavation[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(Supp.2):4975-4978.
[10]刘继国,朱光仪,郭小红,等.厦门海底隧道建设中涌水量流固耦合数值模拟[J].现代隧道技术,2006,43(2):34-37.LIU Ji-guo,ZHU Guang-yi,GUO Xiao-hong,et al.Coupled fluid-mechanical numerical simulation on water inflow capacity in Xiamen subsea tunnel during construction[J].Modern Tunnelling Technology,2006,43(2):34-37.
[11]漆泰岳,高波,马亮.富水软土地层地铁开挖地表沉降离心模型试验[J].西南交通大学学报,2006,41(2):184-189.QI Tai-yue,GAO Bo,MA Liang.Centrifugal model test for ground surface subsidence caused by metro tunneling in saturated soft clay strata[J].Journal of Southwest Jiaotong University,2006,41(2):184-189.
[12]吉小明.隧道工程中水力耦合问题的探讨[J].地下空间与工程学报,2006,2(1):149-154.JI Xiao-ming.Discussion on the research of coupled solid and fluid flow in tunnel engineering[J].Chinese Journal of Underground Space and Engineering,2006,2(1):149-154.
[13]吉小明.隧道开挖的围岩损伤扰动带分析[J].岩石力学与工程学报,2005,24(10):1697-1702.JI Xiao-ming.Study of mechanical and hydraulic behavior of tunnel surrounding rock masses in excavation-disturbed zone[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(10):1697-1702.
[14]唐杰军,凌同华.山区公路分离式隧道围岩流固耦合数值分析[J].矿业研究与开发,2009,29(6):24-26.TANG Jie-jun,LING Tong-hua.Numerical simulation on surrounding rock of separated highway tunnels based on fluid-solid interaction[J].Mining Research and Development,2009,29(6):24-26.
[15]GU C S,SU H Z,ZHOU H.Study of coupling model of seepage field and stress-field for rolled control concrete dam[J].Applied Mathematics and Mechanics(English Edition),2005,26(3):355-363.
[16]薛强,梁冰,马士进.边坡失稳系统的固流耦合模型[J].山东科技大学学报(自然科学版),2001,20(2):87-89.XUE Qiang,LIANG Bing,MA Shi-jin.Solid-fluid coupling model of the system of slope failure[J].Journal of Shandong University of Science and Technology(Natural Science),2001,20(2):87-89.
[17]SMINTH I M,GRIFFITHS D V.有限元方法编程(第3版)[M].王菘,周坚鑫,王来,等译.北京:电子工业出版社,2003.
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