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| Timevarying analysis of damage field evolution and surface subsidence in underground mining process |
| Revised:October 05, 2002 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20045107 |
| KeyWord:underground mining,damage evolution,time-varying mechanics |
| Wang Huaning~* Cao Zhiyuan neering Mechanics Tongji University Shanghai 200092 China) |
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| Abstract: |
| Research object in this paper is time-varying body whose shape is varying with time. By combing time-varying mechanics and damage theory, variable damage parameter which correlated with variational course is introduced. Then the damage-time-varying analysis method is established. For the rock mass, elastic damage-time-varying constitutive equation is derived, and numerical analysis of this method is established by the virtual work principle. In numerical analysis, time-varying effect is considered by applying virtual time-varying non-balanced load which obtained by original stress system analysis. By damage-time-varying computer simulation analysis of mining process of one underground coal bed, dynamic evolution of damage field and surface subsidence due to shape varying are obtained, and comparison of time-varying and non-time-varying analysis and construction analysis is studied. The research showed, continual displacements and damage evolution can be obtained by damage-time-varying analysis which is more reliable to simulate continual construction process than normal and construction analysis. It is a scientific and effective method in prediction of engineering construction. In order to realize economy and security, it is instructive to use damage time-varying method in underground mining analysis. |
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