dc.description.abstract | Dip slope stability analysis is extremely important due to the huge potential losses caused by dip slope sliding disasters. In this research, the geological model (i.e., weak plane distribution) with the ground model (mechanical properties of the weak planes) were assumed to explore the effect of weak plane distribution and mechanical properties on the failure mechanisms (Geotechnical Model) of dip slopes. To analyze the stability of dip slopes, besides the limit equilibrium method and two-dimensional numerical analysis (Slice method, etc.), it is also possible to adapt the 3D numerical analysis to analyze the overall stability of the slopes. In addition, typical dip slope sliding could occur along a given sliding plane. However, based on rock core information and boring logs, various fissures in a thick rock layer that are parallel to the potential sliding plane may be connected and form a potential sliding plane in the sliding mass.
In this research, we take the dip slope in Yang-Ming campus of National Yang-Ming Chiao Tung University as an example, and the three-dimensional distinct analysis software 3DEC was employed to analyze the overall stability of the dip slope. First of all, the 3D numerical models were generated with the digital elevation model (DEM) derived by LiDAR. Secondly, the simplified geological model with the discrete fracture network (DFN) was established in the numerical model based on the boring logs, rock core information, and field survey. Finally, various sliding scenarios corresponding to different potential sliding planes with different strength parameters were analyzed (weakening with ratios of 10%, 50%, and 100%, respectively).
Numerical analysis results show that the dip slope is relatively stable under the current situation. However, if the mechanical strength weakened up to 100%, the slope at the playground and tennis court produces larger displacement in all of the potential sliding scenarios. When comparing with the field investigation information, some tension cracks were also found here, and the area where the displacement occurred partially overlaps with the area with a higher risk in the slope analysis report provided by CECI. Hence, the dip slope may require more monitoring systems, especially for high-risk areas. | en_US |