Stratum deformation laws and influence factors analysis of tunnel excavation in sand
FANG Qian1, DU Jianming1, WANG Gan1, WANG Zhongju2,WANG Guanqing1
1. Tunnel and Underground Engineering Research Center of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China; 2. China Railway Siyuan Survey and Design Group Co., LTD., Wuhan 430063, Hubei, China
Abstract: Aiming at the engineering problems of collapse caused by circular tunnel construction in sand, the influences of cover depths, ground loss ratio, particle size and gradation on the stratum deformation in sand were numerically simulated by PFC2D based on the physical model test results. The results showed that the transmission of disturbance force, which was caused by the circular tunnel construction in sand, was a gradual process, the deeper the buried depth was, the larger the width of settlement trough was, the smaller the maximum settlement value of the ground surface was, and the easier to form the completed arch-shaped stable zone and the “Λ” instability zone; the settlement trough width and the maximum settlement value of the ground surface became large with the increase of the ground loss ratio and there was a linear relationship between the ground loss ratio and the maximum settlement value of the ground surface; the larger the particle size was, the larger the width of settlement trough was, the smaller the maximum settlement value of the ground surface, the faster the disturbance force transmit and the less likely to form the arched stable zone; the influence of particle gradation on the settlement trough width and the maximum settlement value of the ground surface was not significant. The results are of great reference significance for the circular tunnel construction in sand.
房倩, 杜建明, 王赶, 王中举, 王官清. 砂土隧道开挖地层变形规律及影响因素分析[J]. 隧道与地下工程灾害防治, 2020, 2(3): 67-76.
FANG Qian, DU Jianming, WANG Gan, WANG Zhongju, WANG Guanqing. Stratum deformation laws and influence factors analysis of tunnel excavation in sand. Hazard Control in Tunnelling and Underground Engineering, 2020, 2(3): 67-76.
[1] 王梦恕. 隧道及地下工程技术及发展[M]. 北京: 北京交通大学出版社, 2004. WANG Mengshu. Tunnel and underground engineering technology and development[M]. Beijing: Beijing Jiaotong University Press, 2004. [2] PECK R B. Deep excavations and tunneling in soft ground [C] //Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering. Mexico City, Mexico:[s.n.] , 1969: 225-290. [3] MAIR R J, TAYLOR R N, BRACEGIRDLE A. Subsurface settlement profiles above tunnels in clays[J]. Gotechnique, 1993, 43(2): 315-320. [4] CELESTINO T B, GOMES R A M P, BORTOLUCCI A A. Errors in ground distortions due to settlement trough adjustment[J]. Tunnelling and Underground Space Technology, 2000, 15(1):97-100. [5] OSMAN A S, MAIR R J, BOLTON M D. On the kinematics of 2D tunnel collapse in undrained clay[J]. Gotechnique, 2006, 56(9): 585-595. [6] 唐晓武,朱季,刘维.盾构施工过程中的土体变形研究[J]. 岩石力学与工程学报, 2010, 29(2): 206-211. TANG Xiaowu, ZHU Ji, LIU Wei. Research on soil deformation during shield construction process[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(2): 206-211. [7] 韩凯航, 张成平, 王梦恕. 浅埋隧道围岩及位移的显示解析解[J]. 岩土工程学报, 2014, 36(12): 2253-2259. HAN Kaihang, ZHANG Chengping, WANG Mengshu. Explicit analytical solutions for stress and displacement of surrounding rock in shallow tunnels[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(12): 2253-2259. [8] 林存刚, 夏唐代, 梁荣柱, 等. 盾构掘进地面沉降虚拟镜像算法[J]. 岩土工程学报, 2014, 36(8): 1438-1446. LIN Cungang, XIA Tangdai, LIANG Rongzhu, et al. Estimation of shield tunneling-induced ground surface settlements by virtual image technique[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(8): 1438-1446. [9] BOBET A. Analytical solutions for shallow tunnels in saturated ground[J]. Journal of Engineering Mechanics, 2001, 127(12): 1258-1266. [10] CHOU W I, BOBET A. Prediction of ground deformations in shallow tunnels in clays[J]. Tunnelling and Underground Space Technology, 2002, 17(1): 3-19. [11] 韩煊, 李宁, STANGING J R. Peck公式在我国隧道施工地面变形预测中的适用性分析[J]. 岩土力学, 2007(1): 23-28. HAN Xuan, LI Ning, STANGING J R. An adaptability study of Gaussian equation applied to predicting ground settlements induced by tunneling in China[J]. Rock and Soil Mechanics, 2007(1): 23-28. [12] 邓崴, 潘建平, 曾雅钰琼. 砂黏复合地层盾构隧道施工地表横向沉降分析[J]. 科学技术与工程, 2019, 19(18):271-275. DENG Wei, PAN Jianping, ZENG Yayuqiong. Analysis on the lateral subsidence of surface in shield tunneling construction of sand-clay composite stratum[J]. Science Technology and Engineering, 2019, 19(18):271-275. [13] 肖晓春. 新加坡地铁C855标盾构隧道开挖面稳定性分析及泥水压力设定[J]. 现代隧道技术, 2012, 49(1):20-26. XIAO Xiaochun. Analysis of the excavation face stability and slurry pressure setting in the Singapore Metro Lot C855 [J]. Modern Tunnelling Technology, 2012, 49(1):20-26. [14] 胡长明, 冯超, 梅源, 等. 西安富水砂层盾构施工Peck沉降预测公式改进[J]. 地下空间与工程学报, 2018, 14(1):176-181. HU Changming, FENG Chao, MEI Yuan, et al. Modifying of Peck’s settlement calculation formula related to metro tunnel construction in xi'an water-rich sand[J]. Chinese Journal of Underground Space and Engineering, 2018, 14(1):176-181. [15] 王正兴, 缪林昌, 王冉冉, 等. 砂土中隧道施工引起土体内部沉降规律特征的室内模型试验研究[J]. 土木工程学报, 2014, 47(5):133-139. WANG Zhengxing, MIAO Linchang, WANG Ranran, et al. Physical model study on subsurface settlement by tunnelling in sand[J]. China Civil Engineering Journal, 2014, 47(5):133-139. [16] 王海涛, 金慧, 涂兵雄, 等. 砂土地层地铁盾构隧道施工对地层沉降影响的模型试验研究[J]. 中国铁道科学,2017, 38(6):70-78. WANG Haitao, JIN Hui, TU Bingxiong, et al. Model test study on influence of ground settlement caused by shield tunnel construction in sand stratum[J]. China Railway Science, 2017, 38(6):70-78. [17] 陶力铭, 陈中天, 王宇皓, 等. 砂性地层中地层损失引起的地表沉降模型试验[J]. 现代隧道技术, 2018, 55(增刊2):369-374. TAO Liming, CHEN Zhongtian, WANG Yuhao, et al. Model tests of the relationship between ground loss and surface settlement caused by shield tunnelling in sand soils[J]. Modern Tunnelling Technology, 2018, 55(Suppl.2):369-374. [18] 武文安, 黄晓康, 卢坤林. 合肥盾构地表沉降和土压力变化模型试验[J]. 减灾防灾工程学报, 2017, 37(6):916-922. WU Wenan, HUANG Xiaokang, LU Kunlin. Model test on surface settlement and earth pressure in Hefei city shield tunneling[J]. Journal of Disaster Prevention and Mitigation Engineering, 2017, 37(6):916-922. [19] 朱逢斌, 缪林昌, 林水仙. 盾构隧道动态施工诱发地面沉降试验研究[J]. 中国安全科学学报, 2017, 27(11):116-120. ZHU Fengbin, MIAO Linchang, LIN Shuixian. Experimental study on ground settlement caused by dynamic shield tunneling[J]. China Safety Science Journal, 2017, 27(11): 116-120. [20] MOUSSAEI N, KHOSRAVI H M, HOSSAINI F M. Physical modeling of tunnel induced displacement in sandy grounds[J]. Tunnelling and Underground Space Technology, 2019, 90:19-27. [21] 王俊, 何川, 王闯, 等. 砂土地层土压盾构隧道施工掌子面稳定性研究[J]. 岩土工程学报, 2018, 40(1):177-185. WANG Jun, HE Chuan, WANG Chuang, et al. Face stability analysis of EPB shield tunnel in sand[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(1):177-185. [22] 王俊, 林国进, 唐协, 等. 砂土地层盾构隧道稳定性三维离散元研究[J]. 西南交通大学学报, 2018, 53(2): 312-321. WANG Jun, LIN Guojin, TANG Xie, et al. Face stability analysis of shield tunnel in sandy ground using 3D DEM[J]. Journal of Southwest Jiaotong University, 2018, 53(2): 312-321. [23] 王振飞, 张成平. 泥水盾构开挖面失稳破坏的颗粒流模拟研究[J]. 中国铁道科学, 2017, 38(3):55-62. WANG Zhenfei, ZHANG Chenping. Research on particle flow simulation for excavation face instability of slurry shield[J]. China Railway Science, 2017, 35(3):55-62. [24] CHEN R P, TANG L J, LING D S, et al. Face stability analysis of shallow shield tunnels in dry sandy ground using the discrete element method[J]. Computers and Geotechnics, 2011, 38(2):187-195. [25] MELIS MAYNAR M J, MEDINA RODRIGUEZ L E. Discrete numerical model for analysis of earth pressure balance tunnel excavation[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(10): 1234-1242. [26] POTYONDY D O. A bonded-particle model for rock[J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(8): 1329-1364.
2020, Vol. 2 
