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A new displacement back analysis to identify mechanical geo-material parameters based on hybrid intelligent methodology. (English) Zbl 1108.74333
Summary: Displacement back analysis is a common method to identify mechanical geo-material parameters using monitored displacement. How to obtain a global optimal solution in large search spaces with a search that is highly non-linear multimodal is a key point of optimum back analysis. The paper presents a new back analysis that is an integration of evolutionary support vector machines (SVMs), numerical analysis and genetic algorithm. The non-linear relationship between the mechanical geo-material parameters to be identified and the corresponding displacement values of key points is learned and represented by evolutionary SVMs in global optimum. Numerical analysis is used to create training and testing samples for recognition of SVMs. Then, performing a global optimum search on the obtained SVMs using genetic algorithm can identify the mechanical geo-material parameters. The proposed algorithm is tested by back analysis of an elastic plate and an elastic-plastic plate and used to recognize mechanical parameters of subclay, strongly weathered tuff and weakly weathered tuff of Bachimen slope, Funing expressway, Fujian, China. The results indicate that applicability of the proposed algorithm with enough accuracy.

MSC:
74G75 Inverse problems in equilibrium solid mechanics
74L10 Soil and rock mechanics
74S30 Other numerical methods in solid mechanics (MSC2010)
92D99 Genetics and population dynamics
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