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Parameter Inversion of Tunnel Surrounding Rock Based on Differential Evolution Algorithm and Nonlinear Finite Elements

Author: WangJunXiang
Tutor: JiangZuoNan
School: Dalian Maritime University
Course: Road and Railway Engineering
Keywords: Differential evolution algorithm Nonlinear finite element Return mapping algorithm Displacement back analysis Program development
CLC: U451
Type: Master's thesis
Year: 2011
Downloads: 49
Quote: 0
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Abstract


The tunnel in which the geological body has a highly complex and non- deterministic , coupled suffered loads and boundary conditions are more complicated to calculate the required parameters can not be accurately given , making both theoretical analytical method or numerical analytical method in the calculation of difficult to achieve the desired result . Displacement back analysis can effectively solve the parameters are not allowed to \Based on nonlinear finite element theory and geotechnical elastoplastic theory , a new algorithm used in the constitutive equations - return mapping algorithm ( Return Mapping Algorithm) independently developed a nonlinear finite element program return map . FEM program embedded differential evolution algorithm , self-developed intelligent displacement back analysis program ( ie EEOS to anti - analysis program ) . For easy before and after treatment , two programming interface , programming ANSYS software partitioning grid into FEM program before processing documents ; second is the finite element calculation of stress and other results , transforming tecplot software can perform the input data , and thus can be in the form of graphics visual display of simulation results. Test more example of the development of anti- EEOS analysis program more consistent with the numerical results with the analytical solution . Comparison, the parameters of the law of the inversion results and convergence rate impact for reasonable parameter selection of DE basis of the control parameter of the differential evolution algorithm in back analysis procedures . Will develop anti EEOS analysis procedures used in the Dalian metro projects under construction . First field monitoring points in the layout and construction data monitoring , surface subsidence of a particular cross-section , hole week convergence and vault sink analysis , and then using EEOS anti- analysis program back analysis of rock mass parameters Finally, based on the anti- the speech parameters tunnel excavation simulation , each excavation step plastic zone and the evolution of the stress , deformation , and play an important role in guiding the actual project .

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CLC: > Transportation > Road transport > Tunnel project > Tunnel structure theory
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