Inversion of Initial In Situ Stress Field by the Method of Multivariate Analysis and Engineering Application

Abstract:

Based on engineering geological conditions and measured data of the in-situ stress at a hydropower station, 3D geological models under each affecting factor are calculated by means of finite element computing tools ABAQUS and MATLAB. Then, a multivariate regression model is created between the measured and calculated value of in-situ stress at measurement points, and the optimal regression coefficient of the model is found. Consequently, the distributions of initial in-situ stress of this area are obtained. It is the first time to take into account the independence and internal relations among each stress components. Thus, the more reasonable distributions of initial in-situ stress of this area are obtained. The results indicate that the 3D calculating in-situ stress field is reasonable.

• Periodical: Applied Mechanics and Materials (Volumes 44-47)
• Pages: 1203-1206
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.44-47.1203
• Online since: December 2010
• Authors: Xiao Lei Yue, Yong Li, Han Peng Wang
• Keywords: Finite Element Model (FEM), In Situ Stress Survey, Initial In Situ Stress Field, Inverse Analysis, Multivariate Regression Analysis

References

[1] Guo Huaizhi, Ma Qichao, Xue Xicheng, et al. The analytical method of the initial stress field for rock masses. Chinese Journal of Geotechnical Engineering, 1983, 5(3): 64-75.

[2] Yang Linde. Back analysis theory and engineering of geotechnical problems. Beijing: Science Press, (1999).

[3] Liu Yunfang. Geostress in rock mass and engineering construction. Wuhan: Hubei Science and Technology Press, (2000).

[4] DE MELLO F J A, ARMELINJ L, SANTIAGOJ A F, et al. Determination of the natural stress state in a Brazilian rock mass by back analyzing excavation measurements: a case study. International Journal of Rock Mechanics &Mining Sciences, 2002(39): 1005-1032.

DOI: 10.1016/s1365-1609(02)00102-8

[5] XIAO Ming. Back-analysis of three dimensions initial geostress field and stress function. Chinese Journal of Rock Mechanics and Engineering, 1989, 8(4): 337-345.

[6] QIU Xiangbo, LI Shucai, LI Shuchen. 3D geostress regression analysis method and its application. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(10): 1613-1617.