Back Analysis of Field Measurements Around the Tunnel with the Application of Genetic Algorithms

유전자 알고리즘을 이용한 터널 현장 계측 결과의 역해석

  • Kim Sun-Myung (Geotechnical/tunnel Div., Bau Consultant Co., LTD.) ;
  • Yoon Ji-Sun (School of Civil Engrg., Collage of Engrg., Inha Univ.) ;
  • Jun Duk-Chan (Geotechnical/tunnel Div., Bau Consultant Co., LTD.) ;
  • Yoon Sang-Gil (Geotechnical/tunnel Div., Bau Consultant Co., LTD.)
  • Published : 2004.09.01

Abstract

In this study, the back analysis program was developed by applying the genetic algorithm, one of artificial intelligence fields, to the direct method. The optimization process which has influence on the efficiency of the direct method was modulated with genetic algorithm. On conditions that the displacement computed by forward analysis for a certain rock mass model was the same as the displacement measured at the tunnel section, back analysis was executed to verify the validity of the program. Usefulness of the program was confirmed by comparing relative errors calculated by back analysis, which is carried out under the same rock mass conditions as analysis model of Gens et at (1987), one of back analysis case in the past. We estimated the total displacement occurring by tunnelling with the crown settlement and convergence measured at the working faces in three tunnel sites of Kyungbu Express railway. Those data measured at the working face are used for back analysis as the input data after confidence test. As the results of the back analysis, we comprehended the tendency of tunnel behaviors with comparing the respective deformation characteristics obtained by the measurement at the working face and by back analysis. Also the usefulness and applicability of the back analysis program developed in this study were verified.

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