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  • Open Access

    ABSTRACT

    Face stability of shallow shield tunnels in dry sandy ground: model tests, discrete element method simulations and theoretical model

    Renpeng Chen, Linggang kong, Lvjun Tang, Yunmin Chen

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 99-100, 2011, DOI:10.3970/icces.2011.020.099

    Abstract Face stability is critical in the underground tunneling. In this report, large-scale model tests on the face stability of shallow tunnels for various cover depths (C/D = 0.5, 1, and 2) in dry sandy ground were firstly introduced. Then, a series of three-dimensional DEM models were built to simulated the process of tunnel face failure. The results of the model tests and DEM simulations reveal that a chimney like failure zone appears during the tunnel face failure. It was founded that with the increase of the horizontal displacement of the tunnel face, the support pressure More >

  • Open Access

    ABSTRACT

    A Three-Dimensional Shield Tunnel Model Based on Generalized-FEM

    Lin Yifeng, Zhu Hehua, Cai Yongcang

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.2, pp. 51-52, 2011, DOI:10.3970/icces.2011.020.051

    Abstract Shield tunnel linings compose of segments , bolts, liners, et.al., which are quite different in geometry and mechanics. Traditional beam-spring joint model and shell-spring joint model is hard to simulate accurately the detailed characteristic. Classical three-dimensional FEM may cause serious mesh-generation difficulty and expensive calculation cost. Based on generalized finite element method and characteristics of shield tunnel, a three-dimensional shield tunnel structure model is established. In the proposed model a sixteen-node solid-shell generalized FE is devised and employed to simulate segments. Joints between segments or rings are modeled with a surface to surface contact generalized… More >

  • Open Access

    ABSTRACT

    Gas Sealing Behavior of Gasketed Segmental Joints in Shield Tunnels: An Experimental and Computational Study

    Wei Wu1,2,3, Yaji Jiao2,*, Hehua Zhu1,2,3, Rui Jin2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.2, pp. 33-33, 2019, DOI:10.32604/icces.2019.05324

    Abstract When shield tunnels pass through gas-bearing strata, leakage may happen through the gasketed segmental joints, which puts threats on the safety during construction and operation process. Previous studies on sealing performance of the gasketed joints have focused on the waterproof behavior. However, differences in physical characteristics between liquid and gas, lead to different permeation properties. This paper presents a combined experimental and computational study to investigate the gas sealing behavior of the gasketed joints used for a shield tunnel project, i.e., Sutong GIL Utility Tunnel, which passes through soft soil strata rich in high-pressure biogas… More >

  • Open Access

    ABSTRACT

    Block Theory and Its Application to a Water-Conveyance Tunnel Project

    Zixin Zhang1,2,*, Shuaifeng Wang1,2, Xin Huang1,2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.2, pp. 29-29, 2019, DOI:10.32604/icces.2019.04704

    Abstract Block theory is widely used in numerical simulation of rock engineering due to its concision and fast-calculation. The paper proposes block theory for TBM (tunnel boring machine) tunnels to extend the traditional block theory applicative for tunnels excavated by TBM. In the proposed method, TBM-block interaction forces are taken into consideration. Subsequently, an index is proposed to estimate the stability of the TBM tunnel based on safety factor at every given chainage of the tunnel. Finally, a real water-conveyance tunnel project is studied with block theory for TBM tunnels. The simulation results include the joint More >

  • Open Access

    ARTICLE

    A Three Dimensional Numerical Investigation of the T* integral along a Curved Crack Front

    J. H. Jackson1, A. S. Kobayashi2, S. N. Atluri3

    CMES-Computer Modeling in Engineering & Sciences, Vol.6, No.1, pp. 17-30, 2004, DOI:10.3970/cmes.2004.006.017

    Abstract The Tε*  integral was calculated numerically along an extending, tunneling crack front in an 8 mm thick, aluminum three-point bend (3PB) specimen, using a numerical model driven by experimentally obtained surface displacements. The model provided input to a contour integration for the Tε*  integral, via the Equivalent Domain Integral (EDI) method with incremental plasticity. Validity of the analysis was ensured by the agreement of the Tε*  integral obtained on the surface (plane stress) and the plane stress values from previous studies. Tε*   was observed to decrease from the outer surface of the specimen to More >

  • Open Access

    ARTICLE

    Information Monitoring Technology for Support Structure of Railway Tunnel During Operation

    Licai Zhao1,*, Shishuenn Chen

    Structural Durability & Health Monitoring, Vol.12, No.1, pp. 35-50, 2018, DOI:10.3970/sdhm.2018.012.035

    Abstract In the process of railway construction, because of the inconvenience of geological condition, water bursting and mud surging happen frequently, and the later deformation of support structure on the happening geology section would threaten the normal running of railway. The limit difference of deformation control value of the support structure section where geological accidents frequently happen, is small, and artificial half-automatic supervisory technology cannot get the health condition of tunnel in time, resulting many cars speed-down accidents due to deformation of support structure. Through design innovation, we introduce TGMIS in the later period of Yanzishan… More >

  • Open Access

    ARTICLE

    Improved Particle Swarm Optimization for Selection of Shield Tunneling Parameter Values

    Gongyu Hou1, Zhedong Xu1,*, Xin Liu1, Cong Jin1

    CMES-Computer Modeling in Engineering & Sciences, Vol.118, No.2, pp. 317-337, 2019, DOI:10.31614/cmes.2019.04693

    Abstract This article proposes an exponential adjustment inertia weight immune particle swarm optimization (EAIW-IPSO) to enhance the accuracy and reliability regarding the selection of shield tunneling parameter values. According to the iteration changes and the range of inertia weight in particle swarm optimization algorithm (PSO), the inertia weight is adjusted by the form of exponential function. Meanwhile, the self-regulation mechanism of the immune system is combined with the PSO. 12 benchmark functions and the realistic cases of shield tunneling parameter value selection are utilized to demonstrate the feasibility and accuracy of the proposed EAIW-IPSO algorithm. Comparison More >

  • Open Access

    ARTICLE

    Analysis and Numerical Simulation for Tunnelling Through Coal Seam Assisted by Water Jet

    Dengfeng Su1, Yong Kang1,2,*, Xiaochuan Wang2, andan Zheng1, DongyangLi1, Binyuan Yan1, Fuwen Yan1

    CMES-Computer Modeling in Engineering & Sciences, Vol.111, No.5, pp. 375-393, 2016, DOI:10.3970/cmes.2016.111.375

    Abstract Tunnel though coal seam is one of the most difficult tunnels since its risk of coal and gas outburst and the complex geological conditions. According to the directional cutting of water jet and the characteristic of the coal seam and rock mass, this paper presents a new method of tunnelling though coal seam assisted by water jet slotting, which can be divided into improving permeability of coal seam and directional cracking in the rock mass. The mechanism of improving permeability of coal seam was stated, and the crack criterion of rock during blasting was established… More >

  • Open Access

    ARTICLE

    Predicting Leakage-induced Settlement of Shield tunnels in Saturated Clay

    D.M. Zhang1,2, L.X. Ma1,2, H.W. Huang1,2, J. Zhang1,2

    CMES-Computer Modeling in Engineering & Sciences, Vol.89, No.3, pp. 163-188, 2012, DOI:10.3970/cmes.2012.089.163

    Abstract This paper suggests a new set of analytical solutions for predicting leakage-induced seepage field and ground settlement in saturated clay. A unique feature of the solutions presented is considering the effect of the tunnel lining through the relative permeability between the tunnel and the soil. Through the superposition method, the proposed method can be easily extended to twin parallel tunnels. The accuracy of the analytical solutions are verified with numerical simulations. Parametric studies reveal that the decrease of pore pressure and the consequent settlements of ground and tunnel is proportional to the relative permeability. Over… More >

  • Open Access

    ARTICLE

    Contact between a Tunnel Lining and a Damage-Susceptible Viscoplastic Medium

    Frederic L. Pellet1

    CMES-Computer Modeling in Engineering & Sciences, Vol.52, No.3, pp. 279-296, 2009, DOI:10.3970/cmes.2009.052.279

    Abstract In this study, the contact and interaction between a tunnel lining support and a damage-susceptible viscoplastic medium is investigated. First, back-analysis of the time-dependent behaviour of a drift excavated across a carboniferous rock mass which exhibited large delayed displacements was undertaken. Drift closure was simulated using an elasto-viscoplastic constitutive model that included the strength degradation process. This 3D numerical simulation was performed taking into account both stage construction sequence and rate of excavation advancement. A comparison of the numerical results with the data measured on site allowed for the calibration of the model parameters. Subsequently, More >

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