Probabilistic seismic stability analysis — a case study

A previously developed model is used to provide a probabilistic seismic stability analysis for a natural slope located near Slingerlands, New York. The safety of the slope is measured in terms of its probability of failure rather than the customary factor of safety.Three types of possible earthquake sources are investigated, namely, a point, a line, and an area source. The dependence on significant seismic parameters of the probability of failure of the slope is examined and the results are presented in a number of graphs and tables.On the basis of the results obtained in this study, it is concluded that (a) the present model is useful in assessing the reliability of soil slopes under both static and seismic conditions; and (b) the probability of failure of a soil slope is greatly affected by the type of earthquake source involved and the values of the seismic parameters that are associated with it.

Download Full-text

Study on the Calculation Method of Soil-Nailing for High Soil Slope Based on the Logarithmic Spiral Slippery Fracture

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.261-263.1709 ◽

2011 ◽

Vol 261-263 ◽

pp. 1709-1713

Author(s):

Meng Yang ◽

Xiao Min Liu

Keyword(s):

Mathematical Model ◽

Stability Analysis ◽

Engineering Design ◽

Calculation Method ◽

Logarithmic Spiral ◽

Soil Nailing ◽

Soil Slope ◽

Mode Pattern ◽

Shear Function

This paper introduces a new failure mode pattern of soil slope – the logarithmic spiral slippery fracture. A mathematical model for the logarithmic spiral slippery fracture is established, taking the anti-shear function of the soil-nailing into consideration. The shear of soil-nailing, axial force, and the safety coefficients based on the limiting equilibrium method are derived, leading to an accurate stability analysis of the strengthening of soil slope. A case study shows that the anti-shear function of the soil-nailing can be significant and should not be ignored in engineering design.

Download Full-text

A Case Study of Probabilistic Seismic Slope Stability Analysis of Rock Fill Tailing Dam

International Journal of Geotechnical Earthquake Engineering ◽

10.4018/ijgee.2019010104 ◽

2019 ◽

Vol 10 (1) ◽

pp. 43-60 ◽

Cited By ~ 1

Author(s):

Sitharam T.G. ◽

Amarnath M. Hegde

Keyword(s):

Stability Analysis ◽

Limit Equilibrium ◽

Random Variable ◽

Simulation Method ◽

Probability Of Failure ◽

Seismic Stability ◽

Seismic Slope Stability ◽

Rock Fill ◽

Tailing Dam ◽

History Of

The article presents the case history of expansion of rock fill tailing dam of the Rampura-Agucha zinc mine in Rajasthan, India. Before raising the height of the dam from 27 m to 54 m, a detailed seismic stability analysis was performed considering the spatial variability of the soil. The safety values and the probability of failure were calculated using the Monte Carlo simulation method. All the analyses were carried in a 2-D limit equilibrium-based SLIDE software using Spencer's method. The cohesive strength (c), the angle of friction and the acceleration due to earthquakes were considered as the random variable. The final slope geometry was created after the seismic stability analysis of the upstream and downstream slopes. For the critical geometry of the slope, the observed factor of safety values was found to be higher than the values specified in the ANCOLD. The probability of failure value was found to be less than 8%. The newly constructed rock fill dam has already sustained three Monsoon rains and still continues to be performing at its best condition.

Download Full-text