Study of the Failure Evolution of Rock subjected to Foundation Loading Using PFC2D

• Main Authors: Guan-jhou Chen, 陳冠州
• Other Authors: Chee-Nan Chen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/zh97z9

碩士 === 國立臺灣科技大學 === 營建工程系 === 100 === The Numerical Software PFC2D is used to simulate crack evolution within the rock under various magnitude of foundation load in this study. The first part is to conduct the sensitivity analysis of eight microscopic parameters on six macroscopic material parameters. Triaxial compression test (including uniaxial compression) and the Brazilian test simulation were performed to verify the acceptable range of error of the macro parameter values. Through sensitivity analysis, it is found that the macroscopic material parameter values will be stable if the number of particle elements is more than 4000. It also has been observed that the bonding radius magnification factor has the biggest influence on macroscopic material parameters. A sensitivity classification (high, medium, low) is made of eight microscopic parameters on six macroscopic parameter for the purpose of proceeding study. The second part of this study includes the analysis and comparison of rock crack initiation and propagation beneath the foundation under various conditions, such as horizontal surface rock bearing (with/without addition of building structure) and the inclined rock surface. The minimum principal stress or confining pressure situation is also analyzed during the process. Some other findings from the study are, the influence of building structure in the model will make cracks to be less apparent than when there is no building structure nearby. Meanwhile, higher confining pressure will also be observed when the distance of the building structure is closer.