Stability analysis of steep rock slopes

1989 ◽  
Vol 26 (4) ◽  
pp. 595-603 ◽  
Author(s):  
A. Afrouz ◽  
F.P. Hassani ◽  
R. Ucar
Keyword(s):  
Rock Mass ◽  
Failure Criterion ◽  
Variational Calculus ◽  
Failure Surface ◽  
Jointed Rock ◽  
Rock Slopes ◽  
Coulomb Failure ◽  
Potential Failure ◽  
Coulomb Failure Criterion

A simplified method of predicting the shape and location of the potential failure surface in steep rock slopes is suggested. The 1988 updated Hoek and Brown failure criterion is used with Priest and Brown m and s values and Bieniawski's jointed rock mass classification system. This method is demonstrated by an application to the design of slope reinforcement by rock anchoring and by a case study. The validity of the method is assessed by reference to the variational calculus approach, using the linear Mohr–Coulomb failure criterion. Key words: benches, bench design, bench anchoring, quarrying, slope stability, ground control, rock mass rating.

Seismic bearing capacity of a strip footing on rock slopes

2009 ◽  
Vol 46 (8) ◽  
pp. 943-954 ◽  
Author(s):  
Xiao-Li Yang
Keyword(s):  
Bearing Capacity ◽  
Failure Criterion ◽  
Strip Footing ◽  
Rock Slopes ◽  
Coulomb Failure ◽  
Coulomb Failure Criterion ◽  
Seismic Bearing Capacity ◽  
Earthquake Effects ◽  
Almost All ◽  
Bearing Capacity Factor

Most of the seismic calculations currently used for the evaluation of seismic bearing capacity are formulated in terms of a linear Mohr–Coulomb failure criterion. However, experimental evidence shows that a nonlinear failure criterion is able to represent fairly well the failure of almost all types of rocks. In this paper, a nonlinear Hoek–Brown failure criterion is used to estimate the seismic bearing capacity factor of a strip footing on rock slopes in a limit analysis framework. Quasi-static representation of earthquake effects using a seismic coefficient is adopted for the seismic bearing capacity calculations. A linear Mohr–Coulomb failure criterion, tangent to the nonlinear Hoek–Brown failure criterion, is used to derive the objective function that is to be minimized. Upper-bound solutions are obtained by optimization. For static problems, bearing capacity factors related to uniaxial compressive strength, Nσ, are compared. For seismic problems, Nσ factors for different ground inclinations are presented for practical use in rock engineering.

scholarly journals Probabilistic landslide risk assessment: Case study of Bujumbura

2018 ◽  
Vol 251 ◽  
pp. 06011
Author(s):  
Gervais Shirambere ◽  
Maurice O. Nyadawa ◽  
Jean pierre Masekanya ◽  
Timothy Nyomboi
Keyword(s):  
Risk Assessment ◽  
Monte Carlo Simulation ◽  
Landslide Risk ◽  
Cell Level ◽  
Monte Carlo Simulation Technique ◽  
Mapping Model ◽  
Coulomb Failure ◽  
Landslide Risk Assessment ◽  
Coulomb Failure Criterion

A spatial probabilistic landslide risk assessment and mapping model has been applied in a data scare region. The probabilistic model is based on a physical model based on Mohr coulomb failure criterion. A Monte Carlo simulation technique is applied to field collected data. The results are integrated and a probability of landslide is obtained at each cell level. The results are compared to a prepared landslide inventory. The overall accuracy of the model is 79.69%.

Anisotropic characteristics of jointed rock mass: A case study at Shirengou iron ore mine in China

2015 ◽  
Vol 48 ◽  
pp. 129-139 ◽  
Author(s):  
Tianhong Yang ◽  
Peitao Wang ◽  
Tao Xu ◽  
Qinglei Yu ◽  
Penghai Zhang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Iron Ore ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Iron Ore Mine

scholarly journals The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses

Solid Earth ◽  
2016 ◽  
Vol 7 (2) ◽  
pp. 493-508 ◽  
Author(s):  
Abigail Hackston ◽  
Ernest Rutter
Keyword(s):  
Friction Coefficient ◽  
Failure Criterion ◽  
Fault Plane ◽  
Stress Conditions ◽  
Intact Rock ◽  
Rock Types ◽  
State Dependent ◽  
Failure Envelopes ◽  
Coulomb Failure ◽  
Coulomb Failure Criterion

Abstract. Darley Dale and Pennant sandstones were tested under conditions of both axisymmetric shortening and extension normal to bedding. These are the two extremes of loading under polyaxial stress conditions. Failure under generalized stress conditions can be predicted from the Mohr–Coulomb failure criterion under axisymmetric shortening conditions, provided the best form of polyaxial failure criterion is known. The sandstone data are best reconciled using the Mogi (1967) empirical criterion. Fault plane orientations produced vary greatly with respect to the maximum compressive stress direction in the two loading configurations. The normals to the Mohr–Coulomb failure envelopes do not predict the orientations of the fault planes eventually produced. Frictional sliding on variously inclined saw cuts and failure surfaces produced in intact rock samples was also investigated. Friction coefficient is not affected by fault plane orientation in a given loading configuration, but friction coefficients in extension were systematically lower than in compression for both rock types. Friction data for these and other porous sandstones accord well with the Byerlee (1978) generalization about rock friction being largely independent of rock type. For engineering and geodynamic modelling purposes, the stress-state-dependent friction coefficient should be used for sandstones, but it is not known to what extent this might apply to other rock types.

Establishment of a Dynamic Mohr–Coulomb Failure Criterion for Rocks

2012 ◽  
Vol 13 (1) ◽  
Author(s):  
Sheng Huang ◽  
Kaiwen Xia ◽  
Feng Dai
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Shear Strength ◽  
Failure Criterion ◽  
Dynamic Range ◽  
Split Hopkinson Pressure Bar ◽  
Rock Properties ◽  
Hopkinson Pressure Bar ◽  
Coulomb Failure ◽  
Coulomb Failure Criterion

AbstractStatic Mohr–Coulomb Failure Criterion for rocks has been used extensively in various rock engineering applications. In this model, the compressive strength, tensile strength, and shear strength are related. To investigate the applicability of the Mohr–Coulomb model to dynamic failures, we studied the correlation of the three dynamic rock properties: compressive strength, tensile strength and punch shear strength. The strengths are quantified using a split Hopkinson pressure bar (SHPB) system. The methods for acquiring these strengths were briefly discussed. A fine-grained sandstone, Longyou sandstone (LS) was studied using these methods. The results showed that the compressive strength calculated from the punch shear strength of LS matched well with the experimental UCS results, thus the punch shear strength could be effectively used to predict the UCS of rocks. The tensile strength calculated from the punch shear strength of LS also has exhibited a good trend with the experimental results of Brazilian tensile strength. We concluded that the famous Mohr–Coulomb criterion can be extended to the dynamic range. However, caution has to be taken in determining the loading rates for different strength results.

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