Seismic stability of immersed tunnel under locked backfill
WANG Qiuzhe1,2, HAN Rui2, BAI Xiaoxiao2, ZHAO Kai2*
1. School of Architectural Engineering and Management, Jiangsu Vocational College of Business, Nantong 226000, Jiangsu, China; 2. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210000, Jiangsu, China
Abstract: In order to study the seismic stability of immersed tunnel, a viscoelastic-plastic stress-strain hysteresis curve was established based on the extended Masing rule, and the shear-coupled volumetric strain increment model was taken as the source term of the residual pore water pressure growth in Biot dynamic consolidation equation, an effective stress analysis method for sand liquefaction was established. The method was implemented based on the FLAC3D computing platform. The interaction model between sandy seabed and submarine tunnel was established, and the anti-liquefaction mechanism of locked backfilling under seismic loading was studied. The results showed that the locked backfilling increased the anti-liquefaction strength of the seabed and the friction resistance, finally reduced the residual uplift distance, which effectively improved the seismic stability of the immersed tunnel.
王秋哲, 韩瑞, 白笑笑, 赵凯. 锁定回填下沉管隧道地震稳定性[J]. 隧道与地下工程灾害防治, 2023, 5(3): 71-77.
WANG Qiuzhe, HAN Rui, BAI Xiaoxiao, ZHAO Kai. Seismic stability of immersed tunnel under locked backfill. Hazard Control in Tunnelling and Underground Engineering, 2023, 5(3): 71-77.
[1] 李心熙, 禹海涛, 李春元, 等. 沉管隧道暗埋段三维大规模地震响应分析[J]. 现代隧道技术, 2021, 58(4):104-108. LI Xinxi, YU Haitao, LI Chunyuan, et al. 3D large-scale seismic response analysis of bored section of an immersed tunnel project[J]. Modern Tunnelling Technology, 2021, 58(4):104-108. [2] CHENG X S, LI G L, CHEN J, et al. Seismic response of a submarine tunnel under the action of a sea wave[J]. Marine Structures, 2018, 60:122-135. [3] ZHAO K, ZHU S D, BAI X X, et al. Seismic response of immersed tunnel in liquefiable seabed considering ocean environmental loads[J]. Tunnelling and Underground Space Technology, 2021, 115:104066. [4] 赵凯, 王秋哲, 王彦臻, 等. 可液化地基地下结构地震反应特征简化有效应力分析[J]. 振动与冲击, 2021, 40(21):39-46. ZHAO Kai, WANG Qiuzhe, WANG Yanzhen, et al. Effects of soil-underground structure interaction on seismic response of liquefiable sit around underground structure[J]. Journal of Vibration and Shock, 2021, 40(21):39-46. [5] 赵凯, 卢艺静, 王彦臻, 等. 海底盾构隧道结构端部效应及抗减震措施研究[J]. 振动与冲击, 2022, 41(16):33-42. ZHAO Kai, LU Yijing, WANG Yanzhen, et al. Investigations on the spatial end effect of a subsea shield tunnel and the aseismic measures[J]. Journal of Vibration and Shock, 2022, 41(16):33-42. [6] 崔杰, 陆耀波, 渠建新, 等. 水域沉管隧道地震响应的影响因素分析[J]. 西南交通大学学报, 2020, 55(6):1224-1230. CUI Jie, LU Yaobo, QU Jianxin, et al. Influencing factors analysis of seismic responses of water immersed tunnel[J]. Journal of Southwest Jiaotong University, 2020, 55(6):1224-1230. [7] 崔杰, 周鹏, 李亚东, 等. 地震作用下海底沉管隧道的动力响应分析[J]. 地震工程与工程振动, 2016, 36(4):96-102. CUI Jie, ZHOU Peng, LI Yadong, et al. Earthquake dynamic response analysis of seabed under the action of immersed tunnel[J]. Earthquake Engineering and Engineering Dynamics, 2016, 36(4):96-102. [8] 陆耀波, 崔杰, 渠建新, 等. P波斜入射角对沉管隧道地震响应的影响[J]. 震灾防御技术, 2018, 13(3):562-570. LU Yaobo, CUI Jie, QU Jianxin, et al. Analysis on seismic responses of immersed tunnel under inclined P waves[J]. Technology for Earthquake Disaster Prevention, 2018, 13(3):562-570. [9] 徐笑然, 赵旭, 杜修力. 港珠澳跨海工程沉管隧道三维地震反应分析[J]. 震灾防御技术, 2016, 11(1):44-54. XU Xiaoran, ZHAO Xu, DU Xiuli. Three-dimensional seismic response analysis of immersed tunnel project in Hong Kong-Zhuhai-Macau[J]. Technology for Earthquake Disaster Prevention, 2016, 11(1):44-54. [10] 李伟华. 考虑水-饱和土场地-结构耦合时的沉管隧道地震反应分析[J]. 防灾减灾工程学报, 2010, 30(6):607-613. LI Weihua. Seismic response analysis of immersed tube tunnel considering the dynamic interactions between water, stratum and structure influence of liquid parameters on the damage of buried pipeline[J]. Journal of Disaster Prevention and Mitigation Engineering, 2010, 30(6):607-613. [11] ZHOU X J, LIANG Q H, ZHANG Y Y, et al. Three-dimensional nonlinear seismic response of immersed tunnel in horizontally layered site under obliquely incident SV waves[J]. Shock and Vibration, 2019, 2019:1-17. [12] Itasca Consulting Group Inc.. FLAC3D[Z]. Version 5.0. Minneapolis, US: Itasca, 2004. [13] CHEN G X, ZHAO D F, CHEN W Y, et al. Excess pore-water pressure generation in cyclic undrained testing[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2019, 145(7):04019022. [14] 张建民. 砂土的可逆性和不可逆性剪胀规律[J]. 岩土工程学报, 2000, 22(1):12-17. ZHANG Jianmin. Reversible and irreversible dilatancy of sand[J]. Chinese Journal of Geotechnical Engineering, 2000, 22(1):12-17. [15] KIRCA V S O, SUMER B M, FREDSE J. Residual liquefaction of seabed under standing waves[J]. Journal of Waterway, Port, Coastal, and Ocean Engineering, 2013, 139(6):489-501. [16] DOBRY R, ABDOUN T. Recent findings on liquefaction triggering in clean and silty sands during earthquakes[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2017, 143:04017077. [17] WANG Q Z, BIAN J, HUANG W T, et al. Seabed liquefaction around pipeline with backfilling trench subjected to strong earthquake motions[J]. Sustainability, 2022, 14(19):12825. [18] ZHAO K, WANG Q Z, ZHUANG H Y, et al. A fully coupled flow deformation model for seismic site response analyses of liquefiable marine sediments[J]. Ocean Engineering, 2022, 251:111144. [19] ZHAO K, QIN Y, LU Q R, et al. Cyclic resistance of saturated silt under wave-induced non-proportional loading[J]. Applied Ocean Research, 2020, 102:102296.
2023, Vol. 5 
