(1. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;2. Administration of Planning and Construction,Guian New Area,Guiyang,Guizhou 550025,China)
Abstract:In order to accurately obtain the distribution rule of initial geostress field in Jiata dam area in West Route of South-to-North water transfer project,a new two-stage back analysis method of initial geostress field which considers the complex geological conditions and the ground denudation process is presented. Firstly,considering mainly the influence of topography,faults,folds,and development history of river valleys,a large-scale calculation model for the dam area is established. And the genetic neural network method as well as FLAC3D is applied to the first-stage back analysis of initial geostress field. Then,considering the main geological structures in the vicinity of the dam area,a small-scale refined model is created. The preliminary non-linear boundary conditions of the refined model can be obtained by fitting the stress values which are extracted from the large-scale model of the first-stage back analysis. After that,calculation for the second-stage back analysis of geostress field is conducted by optimizing the boundary parameters based on genetic neural network method. It is shown that the difference between the calculated results and the measured data is large in the vicinity of the local geological structures during the first-stage back analysis. And the calculated results are much closer to measured data in the second-stage back analysis by considering the small geological structures as well as the results in the first-stage back analysis. Therefore,the proposed method provides great reference to similar projects.
裴启涛1,李海波1,刘亚群1,宋全杰2,李娜娜1. 复杂地质条件下坝区初始地应力场二次反演分析[J]. 岩石力学与工程学报, 2014, 33(sl): 2779-2785.
PEI Qitao1,LI Haibo1,LIU Yaqun1,SONG Quanjie2,LI Nana1. TWO-STAGE BACK ANALYSIS OF INITIAL GEOSTRESS FIELD OF DAM AREAS UNDER COMPLEX GEOLOGICAL CONDITIONS. , 2014, 33(sl): 2779-2785.
柴贺军,刘浩吾,王明华. 大型电站坝区应力场三维弹塑性有限元模拟与拟合[J]. 岩石力学与工程学报,2002,21(9):1 314-1 318. (CHAI Hejun,LIU Haowu,WANG Minghua. Stress field simulation and fitting by 3D elastoplasticity FEM for large hydropower project[J]. Chinese Journal of Rock Mechanics and Engineering,2002,21(9):1 314-1 318.(in Chinese))
[2]
杨林德. 岩土工程问题的反演理论与工程实践[M]. 北京:科学出版社,1996:25-30.(YANG Linde. Theory and engineering practice of back analysis in engineering problems of rock and soil[M]. Beijing:Science Press,1996:25-30. (in Chinese))
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