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Stresses due to underground mining using a finite element procedure with nonlinear aspects (1988)

Huttelmaier, H. P. ; Glockner, P. G.

Springer

Geotechnical and geological engineering 6 (1988), S. 63-72

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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

URL: http://dx.doi.org/10.1007/BF00881027

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Coordination Chemistry and Catalysis. Investigations on the Synthesis of Cyclooctatetraene by the Method of W. Reppe (1964)

Schrauzer, G. N. ; Glockner, P. ; Eichler, S.

Weinheim : Wiley-Blackwell

Angewandte Chemie International Edition in English 3 (1964), S. 185-191

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ISSN: 0570-0833

Keywords: Coordination modes ; Catalysis ; Cyclooctatetraenes ; Reppe chemistry ; Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The relationship between the structure and the catalytic activity of nickel(II) complexes in the synthesis of cyclooctatetraene by the method of W. Reppe is discussed. The cyclotetramerization of acetylene takes place within labile Ni(II)-acetylene π-complexes. Inhibition tests have made it probable that four molecules of acetylene are grouped around the nickel ion in the transition state, in a configuration which favors the formation of the eight-membered ring.

Additional Material: 4 Ill.