Reliability Degree Analysis Of Stability In Underground Engineering Based On Fuzzy Classification Of Wall Rock

Classification of wall rock is the foundation of designation of underground engineering, and the fuzzy maths method based on subject function plays more and more important role in classification of rock mass. The non-certain factors of underground engineering are notable, impersonal and ubiquitous, thus, We must consider the influence of these non-certainty at design analysis of project. Therefore, in this paper study on this problem has important practical values for theory and engineering.First, based on theory of fuzzy barycenter, the author choose some important factors about classification of wall rock to analyse,remedying shortage of judgement information losing and non-exclusive conclusion when using common fuzzy synthesis judgement method to analyse wall rock classification; Second, the author detrudes subjection function expressions of trapeziform distributing, normal school and mountain distributing about the factors , then combining project, the author uses above-mentioned three distributing to combine arbitrarily and analyses wall rock classification based on fuzzy barycenter theory; Third, considering there hasn't specific expression or high non-linear characteristic at the reliability analysis of underground engineering, the author uses Aitekin iterative to replace finite element simulation at response surface method and establishs some limiting state equations of reliability analysis of underground engineering based on different theories. Combining classical response surface method with the stability analysis method of underground engineering, a new method for underground engineering stability reliability analysis has established. The author workouts program interface of hydrostatic stress field of unsupported state and program interface of non-hydrostatic stress field of unsupported state using improved response surface method based on the interaction of secondary load-supporting subzone and main load-supporting subzone, Also the author workouts Monte Carlo program about hydrostatic stress field of unsupported state , non-hydrostatic stress field of unsupported state, hydrostatic stress field of supported state, non-hydrostatic stress field of supported state and shearing slipping; Finally, the analysis programs are used to analyse the practical engineering, the results have proved the rationality and reliability of the method in this paper, and the applied method is provided for underground engineering reliability analysis.