长江流域在旱季与洪季间水位相差十余米,对江底隧道的影响尤为重大,因此对越江地铁隧道在水位变化下的稳定性研究迫在眉睫。以离散元为工具,借助室内三轴试验标定参数建模,基于二维地铁行车荷载加载模式,选择隧道管片内的颗粒振动加速度、径向应力、环向应力等参数作为研究内容,分析对比常年水位与洪水位下隧道管片的动力响应。研究表明,洪水水位时的管片拉应力和压应力较常年水位条件下大4倍,但未超过管片的抗拉强度;常年水位条件下管片受地铁行车荷载的振动影响较大,其颗粒振动加速度平均值较洪水水位条件下大150倍。因此,在旱季或洪季地铁运行时,均需要加强管片的检测和维护。
Abstract
The water level difference between dry season and flood season in Yangtze River basin amounts to over ten meters, which exerts an unneglectable impact on the stability of cross-river tunnel. Studying the stability performance of cross-river tunnel during subway train operation under water level fluctuation is an urgent task. In this paper, a cross-river tunnel model is built using the discrete element method. Microparameters of the tunnel are first calibrated based on triaxial test. A two-dimensional subway train load is adopted to execute dynamic load on the tunnel. Particle acceleration, radial and hoop stresses of the tunnel lining are considered as parameters to analyze the dynamic characteristics of the tunnel lining segments under different water levels. Results show that the tensile and compressive stresses of the lining segments under flood level are four times larger than those under normal water level, and are still smaller than the tensile strength. The average value of particle vibration acceleration reflecting the influence of subway train load on the lining under normal water level is 150 times larger than that under flood level. Therefore, during train operation, the inspection and maintenance of lining segments should be strengthened no matter in dry or flood season.
关键词
离散元 /
越江隧道 /
地铁行车荷载 /
水位 /
加速度 /
应力
Key words
discrete element method /
cross-river tunnel /
subway train load /
water level /
acceleration /
stress
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 陈卫军, 张 璞. 列车动载作用下交叠隧道动力响应数值模拟[J]. 岩土力学, 2002, 23(6): 770-774.
[2] 高 峰, 关宝树, 仇文革,等. 列车荷载作用下地铁重叠隧道的响应分析[J]. 西南交通大学学报, 2003, 38(1):38-42.
[3] 李 亮, 张丙强, 杨小礼. 高速列车振动荷载下大断面隧道结构动力响应分析[J]. 岩石力学与工程学报, 2005, 24(23):4259-4265.
[4] VOIT K, ZIMMERMANN T. Characteristics of Selected Concrete with Tunnel Excavation Material[J]. Construction & Building Materials, 2015, 101(1): 217-226.
[5] 高文立, 杨明松, 赵伯明. 大跨度过江隧道结构在地震动作用下响应分析[J]. 公路, 2012(5): 344-350.
[6] MIN F L, ZHU W, HAN X R, et al. The Effect of Clay Content on Filter-Cake Formation in Highly Permeable Gravel[C]//Proceedings of GeoShanghai International Conference,2010. doi: 10.1061/41105(378)29.
[7] 李 宁,刘振东,郭秀军,等.旧有隧道隐伏病害GPR探测异常特征分析及病害程度评价[J].长江科学院院报,2018,35(3):97-103,115.
[8] LU J F,ZHANG C W,JIAN P. Meso-structure Parameters of Discrete Element Method of Sand Pebble Surrounding Rock Particles in Different Dense Degrees[C]//Proceedings of the 7th International Conference on Discrete Element Methods.Dalian,China.August 1-4,2016:871-879.
[9] ZHANG Z, ZHANG X, TANG Y, et al. Discrete Element Analysis of a Cross-River Tunnel under Random Vibration Levels Induced by Trains Operating During the Flood Season[J]. Journal of Zhejiang University—Science A, 2018, 19(5): 346-366.
[10]ZHANG Z, ZHANG X, QIU H, et al. Dynamic Characteristics of Track-Ballast-Silty Clay with Irregular Vibration Levels Generated by High-speed Train Based on DEM[J]. Construction & Building Materials, 2016, 125: 564-573.
[11]CONNOLLY D P, KOUROUSSIS G, LAGHROUCHE O, et al. Benchmarking Railway Vibrations—Track, Vehicle, Ground and Building Effects[J]. Construction & Building Materials, 2015, 92: 64-81.
[12]JIANG Y, GAO Y, WU X. The Nature Frequency Identification of Tunnel Lining Based on the Microtremor Method[J]. Underground Space, 2016, 1(2): 108-113.
基金
国家重点研发计划项目(2017YFC1502503);地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2019K001);西部矿产资源与地质工程教育部重点实验室(长安大学)开放基金(300102269506)
PDF(6690 KB)
