The Impact of Temperatures on the Stability of Rocks Surrounding a Single Fracture

International Conference on Smart Engineering Materials 2018

Zhang, Yan^1 ; Li, Ning^2 ; Dai, Jun^1

Institute of Geotechnical Engineering, Xi'An University of Science and Technology, Xi'an, Shaanxi

710054, China^1

School of Civil Engineering and Architecture, Xian University of Technology, Xi'an, Shaanxi

710048, China^2

关键词: Geometric modeling;    Hydropower stations;    Impact of temperatures;    Numerical experimental;    Sensitive regions;    Temperature differences;    Two-dimensional transient;    Underground tunnels;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/362/1/012014/pdf
DOI  :  10.1088/1757-899X/362/1/012014

来源: IOP

【 摘 要 】

Research on the influence of temperature and the accompanying stress on the stability of the rocks surrounding an underground tunnel has become ever more important. This paper constructs a geometric model of a single-fracture tunnel by combining a high-temperature underground tunnel as the object of study with an example that uses a high-temperature tunnel segment in the water diversion tunnel of a hydropower station in Xinjiang. Based on the relevant theoretical analysis, with the consideration of different working conditions, a numerical experimental analysis was conducted to determine the two-dimensional transient temperature field distribution of the tunnel rock mass by using a numerical analysis software. The experimental data was consistent with the measured data. The calculated results show the following: a. when the temperature difference is greater, the stress concentration is higher near the fracture of the surrounding rock; b. the degree of the stress concentration in the crack tip region is not positively correlated to the distance, and there is a sensitive region where the stress varies.