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  • 1.
    Meng, Jingjing
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering. School of Resources and Safety Engineering, Central South University, Changsha, Hunan, China.
    Cao, Ping
    School of Resources and Safety Engineering, Central South University, Changsha, Hunan, China.
    Huang, Jinsong
    Discipline of Civil, Surveying and Environmental Engineering, Faculty of Engineering and Built Environment, The University of Newcastle, Callaghan, Australia.
    Lin, Hang
    School of Resources and Safety Engineering, Central South University, Changsha, Hunan, China.
    Li, Kaihui
    Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong.
    Cao, Rihong
    School of Resources and Safety Engineering, Central South University, Changsha, Hunan, China.
    Three-dimensional spherical discontinuous deformation analysis using second-order cone programming2019In: Computers and geotechnics, ISSN 0266-352X, E-ISSN 1873-7633, Vol. 112, p. 319-328Article in journal (Refereed)
    Abstract [en]

    In this paper, a new formulation of three-dimensional spherical discontinuous deformation analysis (DDA) based on second-order cone programming has been proposed. Artificial springs with open-close iteration used in classic DDA have been removed, given that improper stiffness parameters might cause numerical problems. Furthermore, to account for irregular granular shapes, a rolling resistance model is incorporated in the variational formulation. The proposed formulation can be cast into a standard second-order cone programming program, which can be solved using efficient off-the-shelf optimisation solvers. The proposed approach is validated by a series of numerical examples.

  • 2.
    Sheng, Daichao
    et al.
    Luleå University of Technology.
    Westerberg, Bo
    Mattsson, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Axelsson, Kennet
    Luleå University of Technology.
    Effects of end restraint and strain rate in triaxial tests1997In: Computers and geotechnics, ISSN 0266-352X, E-ISSN 1873-7633, Vol. 21, no 3, p. 163-182Article in journal (Refereed)
    Abstract [en]

    Inhomogeneities caused by end restraint and insufficient drainage during conventional compression triaxial tests are analysed by a numerical method. A finite element model is presented to simulate the testing procedure. The soil-platen interaction is represented by contact elements which allow frictional sliding between contacting nodes. The soil mass is represented by the modified Cam clay model. Coupled hydro-mechanical analyses are carried out in order to simulate both drained and undrained tests. The distributions of stresses and strains in the specimen for different end conditions are compared with the ideal case where no end restraint exists, in order to find representative measuring positions in the sample. Different rates of axial strain are tested in order to study the inhomogeneities caused by insufficient drainage during drained tests. Simulated results show that both end restraint and insufficient drainage can cause the barrel-shape deformation of the specimen. Stress-strain and strength properties based on global measurements are not a good representation of the true material behaviour of one single soil element at constitutive level.

  • 3.
    Wathugala, Deepa N.
    et al.
    Department of Mining and Geological Engineering, University of Arizona, Tucson.
    Kulatilake, Pinnaduwa H.S.W.
    Department of Mining and Geological Engineering, University of Arizona, Tucson.
    Wathugala, Gamage W
    Center for Computing and Information Technology, University of Arizona, Tucson.
    Stephansson, Ove
    Luleå tekniska universitet.
    A general procedure to correct sampling bias on joint orientation using a vector approach1990In: Computers and geotechnics, ISSN 0266-352X, E-ISSN 1873-7633, Vol. 10, no 1, p. 1-31Article in journal (Refereed)
    Abstract [en]

    Observed relative frequencies of joints should be corrected for sampling bias before inferring statistical distributions for orientations. The procedure available for sampling bias correction when finite size joints intersect finite size sampling domains is directly applicable only for vertical sampling planes [1-3]. Thus, a general procedure applicable for sampling domains of any orientation is developed in the present study. The corrected frequency of a joint is obtained by assigning a weight to each joint through a weighting function which is inversely propotional to the probability of intersection between the joint and the sampling plane. This probability of intersection is determined from a hypothesis indicating "the probability of intersection is proportional to the volume in which the center of the sampling domain should lie in order to intersect the joint". A vector approach to find this volume is described herein, followed by applications of this method to study the influence of the sampling bias correction on orientation frequency and to find statistical distributions for orientation data

  • 4.
    Yang, R.
    et al.
    Discipline of Civil, Surveying & Environmental Engineering, Priority Research Centre for Geotechnical Science & Engineering, The University of Newcastle, Callaghan, Australia.
    Huang, Jinsong
    Discipline of Civil, Surveying & Environmental Engineering, Priority Research Centre for Geotechnical Science & Engineering, The University of Newcastle, Callaghan, Australia.
    Griffiths, D.V.
    Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, USA.
    Meng, Jingjing
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Fenton, Gordon A.
    Department of Engineering Mathematics, Dalhousie University, Halifax, Canada.
    Optimal geotechnical site investigations for slope design2019In: Computers and geotechnics, ISSN 0266-352X, E-ISSN 1873-7633, Vol. 114, article id 103111Article in journal (Refereed)
    Abstract [en]

    Site investigation in combination with field and laboratory testing, plays a vital role in characterizing the soil profile for geotechnical design in order to reduce uncertainty. In spite of this, site investigations are often limited in scope due to high costs. In this paper, conditional random fields are used to examine the influence of soil strength mean, standard deviation and spatial correlation length on the risk of slope design failure for different levels of site investigation scope. An undrained slope example is used to illustrate how the proposed approach can be used to assess the risk reduction that can be obtained as the scope of a site investigation is increased. By combining the cost of site investigation with the cost of slope failure, the results indicate that there exists an optimal site investigation scope, beyond which the cost of additional boreholes does not justify the cost savings due to reduced slope failure risk.

  • 5.
    Yi, Changping
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering. Swedish Blasting Research Centre, Luleå University of Technology, Sweden.
    Johansson, Daniel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering. Swedish Blasting Research Centre, Luleå University of Technology, Sweden.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Effects of in-situ stresses on the fracturing of rock by blasting2018In: Computers and geotechnics, ISSN 0266-352X, E-ISSN 1873-7633, Vol. 104, p. 321-330Article in journal (Refereed)
    Abstract [en]

    Blasting is widely applied in deep rock excavation. The effect of in-situ stresses on the fracturing of rock due to blasting was investigated. A theoretical model was used to explain the effect mechanism of in-situ stresses on crack propagation due to blasting. Four cases with different in-situ stress conditions were numerically investigated. The numerical results indicate that the crack propagation is governed by the blast load in the vicinity of the blasthole while the high in-situ stresses can influence the crack propagation in the far-field. The crack propagation trends towards the direction in which the high initial pressure is applied.

  • 6.
    Yi, Changping
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Zhang, Ping
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Johansson, Daniel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nyberg, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Dynamic response of a circular lined tunnel with an imperfect interface subjected to cylindrical P-waves2014In: Computers and geotechnics, ISSN 0266-352X, E-ISSN 1873-7633, Vol. 44, p. 165-171Article in journal (Refereed)
    Abstract [en]

    The analytic solutions for the dynamic response of a circular lined tunnel with an imperfect interface subjected to a cylindrical P-wave were presented in the paper. The wave function expansion method was used and the imperfect interface was modeled with a spring model. The interface separating the liner from the surrounding rock was considered to be homogeneous imperfect. The dynamic stress concentration factors (DSCF) of the rock and liner were evaluated and discussed. The effects of incident wave’s frequency, bonding conditions and distance between the wave source and the tunnel were examined. The results showed that the low-frequency incident wave leads to a higher DSCF than the high-frequency incident wave. The bonding conditions have a great effect on the dynamic response of the lined tunnel. When the bond is extremely weak, the resonance scattering phenomenon can be observed. When the distance between the wave source and the tunnel, depending on frequency of the incident wave, is considered as large, the cylindrical wave can be treated as a plane wave. Limiting cases were considered and good agreement with the solutions available in the literature was obtained.

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