Abstract
A running tunnel in Chongqing, China was constructed in a soil-rock mixture (SRM) by the open-cut method. During the construction period, severe cracks occurred on the tunnel lining floor, which will significantly affect the tunnel’s long-term stability. In this study, the numerical investigation was performed to study the development trend of damage zones in the tunnel lining, identifying the causes of damage and further evaluating the effects of suggested reinforcement measures. Firstly, numerical modeling experiments were conducted to obtain the physical and mechanical parameters of SRM. Then, three 3-dimensional (3D) numerical simulation models were established. The settlement, tensile stress, and distribution of damage zones on the tunnel floor were highlighted. Results indicated that the maximum deformation occurs on the roof of the tunnel lining, and the minimum displacement is in the middle part of the tunnel floor. The maximum compressive stress is within the ultimate compressive strength. However, the tensile strength significantly exceeded the ultimate tensile strength, resulting in cracks in the tunnel lining. If no reinforcement measures are taken, about 66% of the tunnel floor will be tensioned to damage, significantly reducing the bearing capacity and long-term stability of tunnel lining. The stiffness difference between SRM and the bored piles is the reason for damage zones in tunnel lining. It is suggested that grouting reinforcement and steel fiber reinforced concrete should be taken on the tunnel floor to improve damage resistance. Finally, it is verified that the suggested reinforcement measures can effectively control uneven settlement and damage zones in the tunnel floor.
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References
Chiaia B, Fantilli AP, Vallini P (2009) Combining fiber-reinforced concrete with traditional reinforcement in tunnel linings. Eng Struct 31(7):1600–1606. https://doi.org/10.1016/j.engstruct.2009.02.037
China Merchants Chongqing Communications Technology Research & Design Institute CO LTD (2010) Code for Design of Road Tunnel. China Communications Press, Beijing
Cui BW (2012) Study on deformation characteristics of expansive soft rock tunnel in fault zone. Chongqing University
Dalian University of Technology (2004) Technical specification for fiber reinforced concrete structures. China Architecture & Building Press, Beijing
Fakhimi A (2009) A hybrid discrete–finite element model for numerical simulation of geomaterials. Comput Geotech 36(3):386–395. https://doi.org/10.1016/j.compgeo.2008.05.004
Lee CH, Chiu YC, Wang TT, Huang TH (2013) Application and validation of simple image-mosaic technology for interpreting cracks on tunnel lining. Tunn Undergr Space Technol 34:61–72. https://doi.org/10.1016/j.tust.2012.11.002
Li X, Liao QL, He JM (2004) In-situ tests and a stochastic structural model of rock and soil aggregate in the three gorges reservoir area, china. Int J Rock Mech Min Sci 41(3):702–707. https://doi.org/10.1016/j.ijrmms.2004.03.122
Mashimo H, Isago N, Kitani T, Endou T (2006) Effect of fiber reinforced concrete on shrinkage crack of tunnel lining. Tunn Undergr Space Technol 21:382–383
Research Institute of Highway Ministry of Transport (2007) Test Methods of Soils for Highway Engineering. China Communications Press, Beijing
Richards JA (1998) Inspection, maintenance and repair of tunnels: international lessons and practice. Tunn Undergr Space Technol 13(4):369–375. https://doi.org/10.1016/S0886-7798(98)00079-0
Sun SR, Xu PL, Wu JM et al (2014) Strength parameter identification and application of soil–rock mixture for steep-walled talus slopes in southwestern China. Bull Eng Geol Environ 73(1):123–140. https://doi.org/10.1007/s10064-013-0524-1
Vallejo LE, Mawby R (2000) Porosity influence on the shear strength of granular material–clay mixtures. Eng Geol 58(2):125–136. https://doi.org/10.1016/S0013-7952(00)00051-X
Wang XL (2009) Study on comprehensive evaluation technology of underground grouting effect. Beijing Municipal Engineering Research Institute
Wang TT (2010) Characterizing crack patterns on tunnel linings associated with shear deformation induced by instability of neighboring slopes. Eng Geol 115(1-2):80–95. https://doi.org/10.1016/j.enggeo.2010.06.010
Wang Z, Wang LZ, Li LL, Wang JC (2014) Failure mechanism of tunnel lining joints and bolts with uneven longitudinal ground settlement. Tunn Undergr Space Technol 40:300–308. https://doi.org/10.1016/j.tust.2013.10.007
Xiao JZ, Dai FC, Wei YQ, Min H, Xu C, Tu XB, Wang ML (2014) Cracking mechanism of secondary lining for a shallow and asymmetrically-loaded tunnel in loose deposits. Tunn Undergr Space Technol 43:232–240. https://doi.org/10.1016/j.tust.2014.05.013
Xu WJ, Hu RL, Tan RJ (2007) Some geomechanical properties of soil–rock mixtures in the Hutiao Gorge area, China. Geotechnique 57(3):255–264. https://doi.org/10.1680/geot.2007.57.3.255
Xu WJ, Xu Q, Hu RL (2011) Study on the shear strength of soil–rock mixture by large scale direct shear test. Int J Rock Mech Min Sci 48(8):1235–1247. https://doi.org/10.1016/j.ijrmms.2011.09.018
Xu WJ, Yue ZQ, Hu RL (2008) Study on the mesostructure and mesomechanical characteristics of the soil–rock mixture using digital image processing based finite element method. Int J Rock Mech Min Sci 45(5):749–762. https://doi.org/10.1016/j.ijrmms.2007.09.003
Yue ZQ, Chen S, Tham LG (2003) Finite element modeling of geomaterials using digital image processing. Comput Geotech 30(5):375–397. https://doi.org/10.1016/S0266-352X(03)00015-6
Zhang DP (2010) Application of grouting technology in subway tunnel in saturated silty fine sand stratum. China University of Geosciences, Beijing
Zhao Y, Liu Z (2019) Numerical experiments on triaxial compression strength of soil-rock mixture. Adv Civ Eng 2019(PT.2):1–15
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This research is funded by the National Natural Science Foundation of China (No. 51578091). The financial support from the NSFC is much appreciated.
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Responsible Editor: Zeynal Abiddin Erguler
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Jin, X., Hou, C., Li, Y. et al. Cause identification of damage in tunnel constructed in soil-rock mixture site and effect of suggested reinforcement measures. Arab J Geosci 14, 983 (2021). https://doi.org/10.1007/s12517-021-07310-0
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DOI: https://doi.org/10.1007/s12517-021-07310-0