Study On Character And Forecast Model Of Residual Deformation In Mining Site

In this paper, taking the"Tian Zi Miao"tunnel mining site of 307 national road in ShanXi Yangquan as study background, through multi-methods of exploration, mined-out area were surveyed comprehensively. Surveying method and evaluation method, system which originated from study filled the gaps of related norms.The multi-level and omni directional monitoring devices such as layering subsidence monitoring mark located at goaf roof of multi-storey mined-out area and so on, was firstly designed and implemented. It is founded that residual settlement in tunnel site is decided by goaf characteristic that is large exploiting thickness,deeply buried and lately mining time. It is revealed laws of effect of "key layer" which absorbed other goaf subsidence.By similar simulation tests about consolidation process of goaf collapse medium, through anglicizing the rules of collapse medium compression deformation with time, empirical formula that the compression modulus of collapse medium changing with the changing of time and pressure is fitted. While calculation model of residual deformation was set up. The mechanical model of collapse medium is investigated theoretically which revealed that the mechanical model of collapse medium is accord to non-linear nature of rock creep Kelvin model. Finally, the theoretical result was applied to numerical calculation; it provided foundation for theory research.By using theory of"black box", the non-linear rules of time influencing parameters are fitting analyzed. Integral prediction model base on the time influencing parameters is establishment and implement. Based on geological engineering study angle, comprehensively consider the conditions of geological engineering and time, forecast model remedy the deficiency of probability integral method, while it improved the scientific and accuracy of residual deformation forecasting.Adopting trend surface fitting method, three-dimensional geological model of mining site under the complicated topography conditions is established; residual deformation and rock wall and liner stress in tunnel site were numerical analyzed, prediction results of residual deformation in mining site are carried out by static compared analysis and dynamic forecast analysis and it is anatomizes with reality.