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  • 1985-1989  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 65 (1987), S. 181-204 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The safe load limit, a well defined parameter for columns made of linearly viscoelastic solid-type materials with limited creep, is generalized to materially and geometrically nonlinear viscoelastic structures. To illustrate the concepts to be treated, a simple rigid bar-spring/dashpot model simulating the behaviour of imperfect columns is analyzed in detail. Next the imperfect column problem is formulated and solved. Various approximations in the solution technique are introduced which allow relatively simple procedures for the evaluation of the safe load limit. Finally a column made of concrete is analyzed in detail for which the results are compared, where possible, with experimental data, a comparison which shows satisfactory agreement.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-1529
    Keywords: Coal mining ; longwall mining ; subsidence ; stress distribution ; finite element analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary A two dimensional finite element procedure is applied to simulate a coal mining excavation sequence. A procedure with linear solution steps is developed and applied to an idealized mountain cross-section with exceptionally thick coal seams and large dip angle. The results provide information on pillar pressure, floor and roof stability, displacement characteristics and surface subsidence.
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  • 3
    ISSN: 1573-1529
    Keywords: Finite element analysis ; stress distribution ; coal mining ; underground mining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary and conclusions Particular features of the finite element procedure presented here and used for mining sequence simulations, are summarized as follows: (1) Different types of pre-mining stress states can be treated. (2) A mining sequence with options in relief force applications can be simulated. (3) Closure of previously mined openings is indicated. (4) Modelling of rock joints and faults is possible. (5) Nonlinearities in the rock mass, due to plastification and due to tension cracking, can be handled. Two finite-element models representing typical mining conditions within the present study are used in a series of sample analyses to demonstrate the above capabilities. The nonlinear analysis for both plastification and tension showed good convergence characteristics. In a follow-up study the procedure will be used for actual field situations in order to evaluate stress and displacement fields, pillar pressures and surface subsidence. Of particular interest within the present project will be the numerical investigation of large span mining openings under different initial stress conditions as well as the influence of different fault or joint properties on the mining environment.
    Type of Medium: Electronic Resource
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