A model for evaluation of surrounding rock stability based on D-S evidence theory and error-eliminating theory

摘要

In order to evaluate the stability of surrounding rock scientifically and reasonably, a model for evaluation of underground engineering surrounding rock stability based on D-S evidence theory and error-eliminating theory was proposed. Firstly, aiming at the fuzziness and complexity of index weight in the evaluation of surrounding rock stability, four groups of index weight were obtained by using four kinds of weighting methods and synthesized by D-S evidence theory to avoid the difference of single weighting method in calculating index weight. Then, 16 groups of measured rock mass data of the first-stage underground project in Guangzhou pumped storage power plant were taken as samples, and a model for the surrounding rock stability evaluation based on D-S evidence and error-eliminating was constructed. Finally, the established model was applied to the evaluation of the surrounding rock stability of the second-stage underground project of the power plant, and the evaluation results were consistent with those of the other four evaluation models. The results show that D-S evidence theory improves the weighting method, and error-eliminating theory optimizes the defect of setting upper and lower limit values in standard of surrounding rock evaluation. The evaluation results of the established model are accurate and reliable. It provides a new method for the evaluation of underground engineering surrounding rock stability and has certain guiding significance in engineering practice.