Home / Journals / ICCES / Vol.20, No.4, 2011
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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 decreases to the limit support… More >

  • Open Access

    ABSTRACT

    Design of Piled embankment and Settlement Control

    Renpeng Chen
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 101-102, 2011, DOI:10.3970/icces.2011.020.101
    Abstract In China, high-speed transportation infrastructure, including high-speed railways and highways, develops rapidly in recent years. The standard for post-construction settlement of the high-speed transportation infrastructure is restrict with the considerations of safety and comfort. Piled embankments are widely used over the deep soft deposits. The piles that support the embankment are exposed not only to the heavy loading from the embankment self-weight, but also to the cyclic loading induced by high-speed vehicles through their service time.

    In present work, the model tests on soil arching were performed and a method for anticipating the loads carried by the piles was… More >

  • Open Access

    ABSTRACT

    Test investigation on fish-shaped pile subjected to torque in silt

    Lianhua Yuan
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 103-104, 2011, DOI:10.3970/icces.2011.020.103
    Abstract The torsional capacity of general circular section pile comes mainly from the tangential friction between pile and soil. But the pile - soil interface can provide a limited tangential friction. So the bearing capacity of general circular cross section pile is less. Pile does not bear more torque at a small torsion angle. Then the torsion angle of the pile develops rapidly.

    This report presents a experiment on the transformed pile subjected to torque. In this experiment, the steel pipe pile with a closed end is welded with pairs of steel flank pieces on the side from top to… More >

  • Open Access

    ABSTRACT

    The regularized indirect algorithm in BEM for calculating values on and near boundaries

    H.B. Chen
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 105-106, 2011, DOI:10.3970/icces.2011.020.105
    Abstract The calculation of field values and their derivatives near the domain boundary through the boundary element method (BEM) will meet the nearly singularity problem, i.e. the boundary layer effect problem. The tangential derivatives of field values on the boundary often meet an obvious deduction of calculation accuracy. An effective algorithm was proposed by Chen et al. [1,2] to treat these two problems in the same time in elastic BEM and it was recently extended to calculate the second derivative values in potential problem [3]. This algorithm is based on the regularized formulations and is now called the regularized indirect algorithm.… More >

  • Open Access

    ABSTRACT

    Geotechnical physical modeling and high gravity technology

    Linggang Kong, Yunmin Chen, Yanguo Zhou, Jianqun Jiang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 107-108, 2011, DOI:10.3970/icces.2011.020.107
    Abstract To investigate geotechnical systems, high gravity is needed due to the dominance of material self-weight. A centrifuge is a common technique to generate high gravity, which causes centrifugal acceleration. In geotechnical physical modeling, geotechnical centrifuge can generate the same gravity stress as the prototype, guarantees the consistency of model deformation and failure mechanism between the centrifugal model and real objects and solve complex problems in geotechnical engineering, hydraulic engineering and environmental engineering etc. In view of the scientific values of centrifuge and shaking table, Zhejiang University develops one of the largest geotechnical centrifuges in China. The centrifuge is a beam… More >

  • Open Access

    ABSTRACT

    EFFECTS OF WATER ON CREEP DAMAGE PARAMETER OF PLAGIOCLASE

    Jiang-teng LI, Ping CAO, Hang LIN, Xiang-yang ZHANG
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 109-110, 2011, DOI:10.3970/icces.2011.020.109
    Abstract Rock will be soften and weakened its physics mechanics parameters by water, then resulting in the deterioration of stability of geotechnical engineering. The effects of water on creep damage parameters of rock become more distinct for pore water dissipation with time passing. So it is important to study the damage parameters by creep effect under the water-saturated condition.

    In the present paper, a set of uniaxial compression creep experiments of plagioclase specimens were performed under dry and water-saturated in Jinchuan Mine a.! by a circular increment step load and unload method using RYL-600 Shear Rheometer. Creep experiment curves were… More >

  • Open Access

    ABSTRACT

    3D Profile variety Measurement of Pectoral Fin in Fish Fast start

    Jiang Ming, He Xiaoyuan
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 111-112, 2011, DOI:10.3970/icces.2011.020.111
    Abstract Fast-starts are brief, sudden accelerations used by fish during predator-prey encounters. In this paper, a three-dimensional (3D) test and analysis method is critical to understand the function of the pectoral fin during maneuvers. An experiment method based on Fourier Transform Profilometry for 3D pectoral fin profile variety during fish maneuvers is proposed. This method was used in a carp fast-start during prey. Projecting the moirAC fringes onto a carp pectoral fin it will produce the deformed fringe patterns contain 3D information. A high speed camera captures these time-sequence images. By Fourier transform, filter, inverse Fourier transform and unwrap these phase… More >

  • Open Access

    ABSTRACT

    Vibration and dynamic deformation measurement by digital holographic interferometry

    Hong Miao, Chong Yang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 113-114, 2011, DOI:10.3970/icces.2011.020.113
    Abstract An experimental measurement system of digital holographic interferometry is established. The sequence of holograms during the dynamic deformation of a specimen can be captured by the CCD camera continuously. These holograms are reconstructed by a 2D Fourier transform and subsequently the phase difference values between any instant and initial instant can be calculated. The original phase sequence is full of noise in both spatial and temporal domains. A windowed Fourier filtering can be employed to remove the noise and retrieve the clear phase distribution. A further windowed Fourier ridges processing makes it possible to evaluate the first-order derivative and second-order… More >

  • Open Access

    ABSTRACT

    High Temperature and High Speed Digital Image Correlation Method for Dynamical Measurement of Thermal Shock

    Xue Feng*, Xiang Wang, Guobing Zhang, Huimin Xie, Helong Yu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 115-116, 2011, DOI:10.3970/icces.2011.020.115
    Abstract Most ceramic materials, because of their inherent brittleness, are susceptible to catastrophic failure under conditions of thermal shock. A novel method for measuring the dynamical deformation is proposed by using of high speed digital image correlation in high temperature environment. The nature texture of ceramic materials can be used as speckle while filters and monochrome produced by LED are applied to suppress black-body radiation and enhance the luminous intensity.

    The light from the heated material can alter the Grayscale of material surface and the recognition for material surface will become more and more difficult with the temperature increase. In… More >

  • Open Access

    ABSTRACT

    CUDA Techniques in Computational Mechanics

    Peng Wang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 117-118, 2011, DOI:10.3970/icces.2011.020.117
    Abstract Current trends in high performance computing (HPC) are moving towards the availability of several cores on the same chip of contemporary processors in order to achieve speed-up through the extraction of potential fine-grain parallelism of applications. The trend is led by GPUs, which have been developed exclusively for computational tasks as massively-parallel co-processors to the CPU. During 2010 an extensive set of new HPC architectural feature were developed in the third generation of NVIDIA GPUs (Fermi), giving computational mechanics an opportunity to expand use of GPU modelling and simulation.

    This presentation will examine examples relevant to industry-scale HPC practice… More >

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