Study On The Displacement Back Analysis And Optimum Design Of Excavation Subsequence In Underground Engineering

Displacement back analysis and optimum design of excavation subsequence in underground engineering are important to reliability analysis of surrounding rock and detail design. In underground engineering the method to determine initial ground stress and mechanical parameters of surrounding rock mass and excavation subsequence is key problem to design and study. Therefore, in this paper study on this problem has important practical values for theory and engineering.First, based on comprehension analysis of the present study status on optimizing method to displacement back analysis in underground engineering home and abroad, intelligent optimizing method, which fits the features of underground engineering, has been developed by introducing annealing algorithm and genetic algorithm and improving them. Second, according to practical features of nonlinear displacement for underground engineering, the mechanical model on back analysis to initial ground stress and mechanical parameters of surrounding rock mass in underground engineering is established, which is based on the measuring results of displacement of convergence in underground holes. While, by introducing finite element method and combining improved annealing algorithm and improved genetic -annealing algorithm, the theory and method of elastic-plastic displacement back analysis to surrounding rock in underground engineering has been founded. The analysis program is exploited, too. This is useful to optimizing analysis of stability and excavation subsequence to surrounding rock in underground engineering. Thirdly, based on the study of preamble, optimizing analysis model to excavation subsequence in underground engineering, which is according to its feature, has been established using the elastic-plasticity areas of surrounding rock. Optimizing analysis method to excavation subsequence in underground engineering has been established too based on improved annealing algorithm and improved genetic-annealing algorithm. Its analysis program is also exploited. Finally, the analysis programs are used to analyse the practical engineering, discussing their application methods, the results have proved the rationality and reliability of the model and method in this paper.