A Numerical Study of Coupled Thermal-Hydrological- Mechanical Behaviour in Poroelastic Rocks

• Main Authors: Chun-Chun Tsai, 蔡純純
• Other Authors: Chein-Lee Wang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/33855409485571337742

碩士 === 國立成功大學 === 資源工程學系碩博士班 === 93 === 　　In the field of rock engineering, such as mining, underground excavation, slope engineering, oil and terrestrial heat exploration, earthquake engineering, and the disposal of nuclear waste fields, the significance of the coupling effects of thermal, hydrological, and mechanical behavior of geo-materials should be considered. This study attempts to use a one-dimensional coupling model to analyze the response of the rocks under the thermal-hydrological- mechanical interactions. Three temperature-time histories are employed to investigate the coupling mechanism of thermo-hydrology-mechanics. First, a rectangular temperature-time relationship is given to simulate the behavior of rock when the temperature is reduced immediately at boundary. Secondly, a triangular temperature-time curve is used to study the behavior of rock when the temperature decreases gradually at boundary. Finally, a curve with a descending branch after a constant temperature is used to simulate the gradually dropping temperature at boundary. The numerical solutions of temperature, displacement, and pore pressure are evaluated by the finite element analysis software, PDEase2D. Numerical results show the displacement and pore pressure change significantly near the boundary where the temperature changes. The dissipating rate of pore pressure also relates to the temperature-time history. The trend of pore pressure and displacement are similar. In the case of two-way draining, numerical results finds there is a trace of loop between the plot of pore pressure and displacement.