Document: NUREG-0800
Document ID: 8981f423-79ff-42f4-9d5d-f0aa9777b60e
Document Type: srp
Title: STABILITY OF SLOPES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340606.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.5
CFR Part: 
CFR Title: 

Content:
complete discussion of procedures used to estimate, from the available field and laboratory data, conservative soil properties and profiles to be used in the analysis. 3. A summary and description of groundwater, seepage, and high and low groundwater conditions. Subsection 2.5.5.2. In meeting the requirements of References 1, 2, 3, 6, and 7 and the regulatory positions of Reference 8, the discussion of design criteria and analyses is acceptable if the criteria for the stability and design of all seismic Category I slopes are described and valid static and dynamic analyses have been presented to demonstrate that there is an adequate margin of safety. A number of different methods of analysis are available in the literature. Computer analyses should be verified by manual methods. Analysis using both deterministic and probabilistic approaches is desirable. To be acceptable, the static analyses should include calculations with different assumptions and methods of analysis to assess the following factors: 1. The uncertainties with regard. to the shape of the slope, boundaries of the several types of soil within the slope and their properties, the forces acting on the slope, and pore pressures acting within the slope. 2. Failure surfaces corresponding to the lowest factor of safety. 3. The effect of the assumptions inherent in the method of analysis used. 4. Adverse conditions such as high water levels due to the probable maximum flood .(PMF), sudden drawdown, or steady seepage at various levels. In general, safety factors related to the slope hazard are needed; however, actual values depend somewhat on the method of analysis, on the assumptions concerning the soil properties, on construction techniques, and on the range of material parameters. 2.5.5-4 Rev. 2 - July 1981 To be acceptable, the dynamic analyses must account for the effect of cyclic motion of the earthquake on soil strength properties. Actual test data are needed for both the in situ soils as well as for