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工程科学与技术:2018,50(5):38-46
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跨断层隧道衬砌变形规律及损伤机理研究
(1.四川大学 水力学与山区河流开发保护国家重点实验室, 四川 成都 610065;2.四川大学 水利水电学院, 四川 成都 610065;3.四川大学 深地科学与工程教育部重点实验室, 四川 成都 610065)
Study on the Deformation Law and Damage Mechanism of Cross Fault Tunnel Lining
(1.State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu 610065, China;2.College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China;3.Key Lab. of Deep Underground Sci. and Eng., for Minisity of Education, Sichuan Univ., Chengdu 610065, China)
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投稿时间:2018-01-29    修订日期:2018-05-27
中文摘要: 陆地交通的直线化趋势使得跨断层隧道不可避免,该类工程是隧道衬砌发生变形破坏的主要事故区间。断层破碎带的基本参数宽度、倾角对于判别断层错动影响下隧道稳定性具有重要的意义。以现场监测与数值模拟相结合的手段,探索了断层错动对跨断层隧道的影响及破坏特征。以地处西部地震多发带、地震基本裂度为Ⅷ度的隧道为工程背景,基于现场实测数据,对断层宽度20 m、倾角70°,以及断层宽度8 m、倾角65°的跨断层隧道变形及破坏机理进行分析。进一步运用ABAQUS数值模拟探索了不同断层宽度(10、20、40 m)和倾角(65°、75°、85°)的断层错动对跨断层隧道的变形及破坏影响特性,揭示了断层宽度、倾角的变化对隧道衬砌应力、应变、位移的影响机制。结果表明:断层错动影响下,隧道衬砌位移、应变、最大主应力受断层宽度的影响较小,受断层倾角的影响较大。断层宽度、倾角的变化对跨断层隧道衬砌位移的变化影响较小,隧道拱顶、拱腰、拱底的位移变化趋势大致相同。围岩结构面粗糙度的增加会减小隧道位移值的变化,但对位移变化趋势的影响较小。跨断层隧道衬砌应变的变化范围受断层宽度、倾角影响较小;随着断层宽度的增加、倾角的减小,隧道衬砌的应变逐渐增大。通过分析不同断层宽度、倾角组合下隧道衬砌应力特征,发现断层宽度越小,倾角越大;衬砌最大主应力受影响范围越小,隧道衬砌越危险。研究结果有望对跨断层隧道的施工建设提供参考与指导。
Abstract:The trend of linearization of land transportation makes the cross-section tunnel inevitable, which is the main accident section of tunnel lining deformation and destruction. Basic parameter like width and dip angle are important for judging the stability of tunnel with fault. The influence of fault dislocation on the cross-section tunnel and its destroy characteristics were researched by combining in-situ monitoring data with numerical simulation. Engineering background was the tunnel located in western China where the basic seismic rupture is Ⅷ degree. The deformation and failure mechanism of the cross-section tunnel where the width of one fault is 20 m, dip angle is 70° and the width of another is 8 m, dip angle is 65° were analyzed based on the measured data. The effects of fault dislocations of different fault widths (10 m, 20 m, 40 m) and dip (65°, 75°, 85°) on the deformation and failure of cross-fault tunnels were further explored by ABAQUS. The influence mechanism of the change of fault width and inclination on the stress, strain and displacement of tunnel lining were revealed. The results showed that under the influence of fault dislocation, the displacement, strain and maximum principal stress of the tunnel lining are less affected by the width of the fault and greatly affected by the fault dip angle. The variation of fault width and dip angle has little effect on the displacement of lining in tunnels across the fault, and changing trend of displacements of dome, arch waist and arch of tunnel are almost the same. The increase of roughness of the structural surface of the surrounding rock decreases the change of displacement but the affect is small. The range of variation of the lining strain of the cross-fault tunnel are less affected by the width and inclination of the fault, but the strain of the tunnel lining gradually increases as the fault width increasing and the dip decreasing. By analyzing the stress characteristics of tunnel linings under different combinations of width and inclination, it was found that the smaller the fault width and the larger the inclination angle, the smaller the affected area of the lining, the more dangerous the tunnel lining. The results are expected to provide reference and guidance for the construction of cross-fault tunnel.
文章编号:201800258     中图分类号:TU352.1    文献标志码:
基金项目:国家重点研发计划资助项目(2016YFC0600701);国家自然科学基金委面上项目资助(51674170)
作者简介:陈海亮(1992-),男,硕士生.研究方向:岩土工程.E-mail:chen20140116zheng@163.com
引用文本:
陈海亮,高明忠,汪文勇,刘强,陆彤,彭高友.跨断层隧道衬砌变形规律及损伤机理研究[J].工程科学与技术,2018,50(5):38-46.
CHEN Hailiang,GAO Mingzhong,WANG Wenyong,LIU Qiang,LU Tong,PENG Gaoyou.Study on the Deformation Law and Damage Mechanism of Cross Fault Tunnel Lining[J].Advanced Engineering Sciences,2018,50(5):38-46.