A Study on Evaluating the Stability Factors of Anti-dip Slate Slopes

• Main Authors: Yuan-Chang Li, 李沅昶
• Other Authors: Fu-Shu Jeng
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/pyhf5w

碩士 === 國立臺灣大學 === 土木工程學研究所 === 106 === Toppling failure is one major failure types of slate slope, which is affected by many factors, such as slope height, slope angle, dip angle and material strength, etc. To investigate the strength and detremine the failure criteria of slate foliation, this study conducted a series of pull-off test and direct shear tests. Furthermore, this study implement the proposed failure criteria in distinct element software UDEC to simulate toppling failure of slate slopes under different conditions such as dry, and wet condition ,different dip angles and different slope angles and different slope heights. The results of this study are summerized as follows: (1) The experimental results show that the failure criteria of foliation is highly nonlinear in low normal stress. (2) Compared with the results from dry and wet condition, the slate exhibits wet-weakening effect. (3) When the failure pattern exhibits stepped failure, the shear strength is greater than that of planar failure. (4) In microscopic view, slate is sheet arrangement and it is jagged at the crack. (5) The simulation based on the proposed failure criteria exhibits more reasonable results. (6) The relationship of slope angle and dip angle will influence the failure type and result. (7) Increasing the slope height, toppling failure is more significant.