Joints rock slope stability

Along with the construction of a series of great hydropower stations, the problems of landslides caused by the rise of water level, and the stability of high slopes under the sharp rise of water pressure by rainfall are in critical needs in China. Consequently, the coupled problem of unsteady flow and damage of jointed rock mass are related to all above problems and is addressed in this paper. Some basic research works had been done by Yang (1995). The authors of this paper set up the coupled constitutive model of unsteady flow and damage, and the model was applied to analyze the stability of high slope of the permanent lock of TGP. 

We selected a survey method using stereoscopic images because it was difficult to measure rock joints in high places. We also could conduct a slope stability analysis and establish stabilization measures in the failed large scale slope using the obtained strikes and dips of rock joints by stereophotogrammetry. 

In deep cuts, debris-catching benches are recommended Fair - cut slopes ranging from 2 1 to 1 1 are recommended flatter where rocks are intensely jointed or fractured. Rockfall may be frequent if steeper cuts are made. Locally, lenses of harder rock may permit steeper cuts Poor - flatter slopes are recommended. Some deposits commonly exhibit a deceptive temporary stability, sometimes standing on vertical or near-vertical cuts for periods ranging from hours to more than a year... 

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