Inversion Analysis of Three-Dimensional Geostress Field in the Second Stage Project of South-to-North Water Transfer

Abstract:

Focus on the topography features of V-shaped deep river valley in Ada dam area, the influence of intensively, moderately and slightly weathered stratum as well as the action of river valley erosion on geostress field was considered. Then, the 3-D initial geostress unloading model was established based on the measured geostress data and geological conditions. Combining the finite element numerical method and inversion theory, multiple regression analysis was established between the measured and corresponding calculated results of geostress. Then, the optimal regression coefficient could be derived. In addition, for convenience of comparison, another method was adopted by ignoring the action of river valley erosion. Through the comparison between the computed values by two methods and the measured geostress values respectively, it is found that the computed values by the former method are more close to the measured ones. Therefore, the distribution rule of initial geostress field can be obtained accurately, which provides important reference for design and construction of Ada dam and its diversion tunnel layout.

• Periodical: Applied Mechanics and Materials (Volumes 66-68)
• Pages: 901-906
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.66-68.901
• Online since: July 2011
• Authors: Qi Tao Pei, Hai Bo Li, Y.Q. Liu, Feng Wei Yang
• Keywords: Deep River Valley, Geostress Field, Inversion, Multiple Regression Analysis, River Valley Erosion

References

[1] Chai Hejun, Liu Haowu and Wang Minghua: Chinese Journal of Rock Mechanics and Engineering Vol. 21 (2002), pp.1314-1318.

[2] Yang Linde: Back Analysis Theory for Geotechnical Engineering and Its Engineering Application (Science Press, 1996).

[3] Yi da, Chen Shenghong: Rock and Soil Mechanics Vol. 24 (2003), p.254—256.

[4] Liu Yunfang, Gong Bixin, Xiao Benzhi, et al: Journal of Yangtze River Scientific Research Institute Vol. 4 (1993), pp.45-53.

[5] Liang Yao, Zhao Gang and Yang Tao: Journal of Southwest JiaoTong University Vol. 44 (2009), pp.569-573.

[6] Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Experimental report on in-situ stress in the first stage of west route of South—to-North Water Transfer Project (II) (Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, 2004).

DOI: 10.18690/actageotechslov.15.1.17-27.2018