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首页> 美国政府科技报告 >Design Optimization in Underground Coal Systems. Volume IV. A Theoretical Yield-Pillar Design Technique Using the Finite-Element Method of Stress Analysis. Final Technical Report, February 28, 1981
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Design Optimization in Underground Coal Systems. Volume IV. A Theoretical Yield-Pillar Design Technique Using the Finite-Element Method of Stress Analysis. Final Technical Report, February 28, 1981

机译：煤炭地下系统的设计优化。第四卷。应力分析有限元法的理论产量支柱设计技术。最终技术报告，1981年2月28日

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The purpose of the research was to develop a three-dimensional finite element program to facilitate the design of coal-mine yield pillars that would represent pillar behavior not only during the prefailure elastic stage but also in the postfailure phase. This program was written as part of the effort to facilitate design of longwall face systems especially regarding pillars in the heat and tail entries. Because of the symmetry of the pillar and the massive storage requirements required for three-dimensional work, only a quarter of the pillar was analyzed. The potential of the method may be somewhat limited by the requirements of computer storage of data and long computer execution time. The best potential application will be in the design of yield pillars or yielding zones in conventional mining panels under very deep cover or for head and tail entries in longwall mining systems where pillar loads may become substantial. The application to yield pillars under these conditions may allow even lowering of the roof over the pillar zone with considerable benefits in terms of both roof and floor conditions. The following conclusions were apparent: three dimensional finite element work is costly and time consuming due to the substantial storage requirements necessary in the computer and the long execution time; the program has considerable potential for the design of yielding pillar systems in the centerline layouts of both conventional and longwall mining systems; the testing beyond failure for principal design components has considerable importance in the mine design process; and this approach may be utilized to great advantage under certain conditions. (ERA citation 06:015257)

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