| dc.description.abstract | The behavior of rock slope engineering is significantly affected by the orientation of discontinuity and excavation orientation of slope face. Under same orientation of discontinuity, the different excavation orientation of slope face will comprises of dip slope, oblique slope and anti-dip slope. What′s more, the rock slope engineering will show completely different characteristics such as stability, landslides scale and failure mode, which is called the anisotropic engineering behavior of rock slope in this paper. The anisotropic engineering behavior of rock slope including the different engineering properties of dip slope, oblique slope and anti-dip slope, has been recognized, valued, by geotechnical engineers and engineering geologists. Technical specifications based on empirical methods have also been used for many years, but they are sort comprehensive and unified analysis model to explore the anisotropic engineering behavior of rock slope.
In this paper, I use the FracMan to generate discrete fracture network(DFN), and imports into PFC3D to construct a unified analysis model base on synthetic rock mass (SRM). That is simulated for the landslide behavior of rock slopes from dip slope to oblique slopes and then to anti-dip slope. This paper carries out a series of numerical simulations for a rock slope with a set of discontinuity (slope angle 75°, slope height 250m, slope length 580m). The analysis variables include: the dip of the discontinuity (30°, 45°, 60°, 70°) and the angle between dip direction of slope face and discontinuity (0°~180°, step 10°). The change of the landslide behavior from the dip slope to anti-dip slope is attempted to describe with the quantitative indicators such as energy release of landslides, landslides volume, displacement magnitude, movement direction and impact area.
Based on the research results: (1) The unified analysis mode is constructed based on the synthetic rock mass which does not need to preset the failure mode, and it can simulate the landslide behavior of the dip slope to oblique slopes and anti-dip slope. The analysis results are reasonable with the general engineering experience. (2) The energy realese of landslides includes the mass of landslides and the fall distance, which is a good indicator to quantify the scale of the landslide events. The energy release of landslides is better than the safety factor which is obtained by the conventional limit equilibrium analysis to represent the risks and losses caused by the landslide events. (3) In this paper, the energy realese of landslides is used as the index that is attempted to establish the discontinuity orentation adjustment of rock slope engineering in the classification of RMR. (4) The impact area is based on digital terrain model which elevation can be used to describe the severity of the terrain change, and the terrain change can be divided into depletion area and deposition area. The impact area has richer and more comprehensive information content than the commonly used safety factor, traval distance, setback, and reach angle, that can improve rock slope stability and risk analysis tasks. | en_US |