跨层引水隧洞长期稳定性的数值分析
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摘要
引水隧洞在跨层的情况下,由于不同岩层之间材料特性的不同,在运营期间围岩往往会出现复杂变化,从而导致灾害的发生。文章以岩溶区内某跨层引水隧洞为例,基于流固耦合理论,通过有限元软件ABAQUS实现对该工程的有限元数值模拟,并选取主要断面完成了数值模型计算分析。通过对运营过程中隧洞围岩的应力和位移变化情况进行监测,得出该隧洞在运营过程中的稳定性变化情况并提出建议。研究结果表明:不同岩层的交界处会使得隧洞围岩应力产生不同情况的突变,一定程度上减弱了应力集中面积,但对应力最大值的影响不大;岩溶岩层内部流体与隧洞内水之间的交换利于应力消散,但渗漏现象严重;在长期通水过程中,隧洞整体呈横向扩展以及纵向收缩的趋势。
Due to the different material properties between different rock strata, complex changes of surrounding rock of hydraulic tunnels often occur during operation and lead to disaster when the tunnels are crossing rock strata.Based on a hydraulic tunnel of a water transfer project in the karst area, finite element numerical simulations of the hydraulic tunnel's main sections are established by finite element software ABAQUS in this paper,with the theory of fluid solid coupling. The changes of tunnel's sections' forces and displacements are monitored to analyze the changes of sections' stability in operation, and then suggestions are made. The results show that: the interfaces of different rock layers would lead to different sudden changes of stress in the tunnel surrounding rock, and the stress concentration areas are weakened in these locations, but the effect on the maximum stress is not significant; the exchange between the permeable stratum's fluid and the water in the tunnel is beneficial to the dissipation of rock surroundings' stress,but the leakage there is serious; After long time of water flow process,transverse expansion and longitudinal contraction occur.
Due to the different material properties between different rock strata, complex changes of surrounding rock of hydraulic tunnels often occur during operation and lead to disaster when the tunnels are crossing rock strata.Based on a hydraulic tunnel of a water transfer project in the karst area, finite element numerical simulations of the hydraulic tunnel's main sections are established by finite element software ABAQUS in this paper,with the theory of fluid solid coupling. The changes of tunnel's sections' forces and displacements are monitored to analyze the changes of sections' stability in operation, and then suggestions are made. The results show that: the interfaces of different rock layers would lead to different sudden changes of stress in the tunnel surrounding rock, and the stress concentration areas are weakened in these locations, but the effect on the maximum stress is not significant; the exchange between the permeable stratum's fluid and the water in the tunnel is beneficial to the dissipation of rock surroundings' stress,but the leakage there is serious; After long time of water flow process,transverse expansion and longitudinal contraction occur.
引文
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[2]黄鸿健,张民庆.宜万铁路隧道工程岩溶及岩溶水分析与应对[J].现代隧道技术,2009,(2):22-34.HUANG Hongjian,ZHANG Minqing. Analysis and Countermeasures against Karst and Karst-water in Tunnels on Yichang-Wanzhou Railway[J]. Modern Tunnelling Technologym,2009,(2):22-34.
[3]李豫馨,夏强,许模,等.隧道开挖过程涌水量的动态模拟[J].现代隧道技术,2015,(5):125-130.LI Yuxin,XIA Qiang,XU Mo,et al. Dynamic Simulation of Water Inflows during Tunnel Excavation[J]. Modern Tunnelling Technology,2015,(5):125-130.
[4]李元海,杨苏,喻军,等.大型溶洞对隧道开挖稳定性的影响分析[J].现代隧道技术,2016,(4):52-60.LI Yuanhai, YANG Su, YU Jun,et al. Influence of a Large Karst Cave on Rock Mass Stability during Tunnelling[J]. Modern Tunnelling Technology,2016,(4):52-60.
[5]赵明阶,金鹏.层间孔隙岩溶影响隧洞稳定性的数值模拟研究[J].地下空间与工程学报,2017,(3):827-832.ZHAO Mingjie,JIN Peng. Numerical Simulation on Effects of Interlayer Pore Karst on Tunnel Stability[J]. Chinese Journal of Underground Space and Engineering,2017,(3):827-832.
[6]钱家忠,汪家权.中国北方型裂隙岩溶水模拟及水环境质量评价[M].合肥:合肥工业大学出版社,2003.QIAN Jiazhong, WANG Jiaquan. Simulation of Karst Water and Evaluation of Water Environment Quality of Fracture in North China[M]. Hefei:Hefei University of Technology Press,2003.
[7]李培超.多孔介质流-固耦合渗流数学模型研究[J].岩石力学与工程学报,2004,23(16):2842-2842.LI Peichao. Mathematical Models of Flow-Deformation Coupling for Porous Media[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2842-2842.