Prediction of failure mode in weak rock slopes using fuzzy slope mass rating

Stability of weak rock slopes are threatened by structurally controlled mechanisms or mass failure. Shallow depth lignite beds are commonly exploited by surface mining. Preliminary slope stability analysis is carried out by practical tools that perform quick stability investigation with limited data. Kinematical analysis is a widely used method that requires orientational data and the rock mass friction angle. However, geological or mechanical features of the rock mass are disregarded. Slope Mass Rating (SMR) is an alternative that considers the basic Rock Mass Rating (RMR) parameters and the discontinuity orientations. However, it suffers from the common drawbacks of classification systems. In addition, it is required to be tuned for weak rock mass. This study modifies the classical SMR system by Fuzzy Logic to predict the slope failure mode. Enhancements on the prediction mechanism depend on the expert opinion. Fuzzy membership functions and rules were outlined by the expert view. The fuzzy interpretation mechanism was established. Later, the modified methodology was validated on two large slope failures of surface lignite mines in Turkey. Other failure modes were investigated by 3D discontinuum numerical simulations. The modified methodology presented in this study enhances the prediction capability of SMR with no claim to replace the analytical or numerical solutions.
14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019; 13 September 2019 through 18 September 2019


Affect of shear strength criteria selection in probabilistic rock slope stability analyses: A case study for a jointed rock slope in Norway
Düzgün, Hafize Şebnem; Bhasin, R. K. (2007-05-31)
Probabilistic rock slope stability analyses are essential to risk assessments, as risk is defined by the probability of occurrence of an instability multiplied by the consequences of the failure. Usually, probabilistic rock slope stability problems are modeled using the Coulomb failure criterion since it is linear, providing simple modeling algorithms. It is acknowledged widely that rock slope stability problems may exhibit non-linear failure behavior, leading to consideration of non-linear limit equilibriu...
A computer simulation of void dynamics under the action of electromigration and capillary forces in narrow thin interconnects
Ogurtani, TO; Oren, EE (2000-10-25)
In these studies a comprehensive picture of void dynamics in connection with the critical morphological evaluation has been thoroughly anticipated in order to understand main reasons as well as the conditions under which premature failure of metallic thin interconnects occur. Our mathematical model on diffusion and mass accumulation on void surfaces, under the action of applied electrostatic potential and capillary effects, follows a novel irreversible but discrete thermodynamic formulation of interphases a...
Fuzzy approach for preliminary design of weak rock slopes in lignite mines
Yardımcı, Ahmet Güneş; Karpuz, Celal (Springer Science and Business Media LLC, 2018-02-01)
Rock slope failure modes are either driven by structurally controlled mechanisms (planar, wedge, or toppling failure) or lean upon the highly jointed or weak rock mass (circular failure). Developing practical tools for preliminary slope design is a popular topic among geotechnical society. This study proposes a practical methodology to predict a safe overall slope angle for weak rock slopes of lignite mines. Rock mass rating (RMR) and slope mass rating (SMR) classification systems can be remarkably misleadi...
Determination of the 1st buckling and collapse loads for integrally stiffened panels by artificial neural network and design of experiment methodology
Güzel, Şükran Gizem; Gürses, Ercan (2021-01-22)
Buckling is a structural instability that load carrying capacity of a structural element may suddenly decrease. This sudden change in the load carrying capacity may cause catastrophic failures. Therefore, determination of the first buckling and collapse loads of structural elements is essential. FE analyses and structural testing are used to determine buckling characteristics of a structural element. However, in early design stages, FE analyses are time consuming and structural testing is costly. In this pa...
Evaluation of the complex kinematic failure mechanisms along Mudurnu Valley, Bolu, Turkey through the utilization of UAV
Kelam, Arzu; Akgün, Haluk; Koçkar, M.k. (2018-06-22)
Rock slopes can cause severe failures and they are crucial in characterizing rock masses realistically in order to overcome natural hazards. Mudurnu County, which is settled in a steep valley presents a case for regional rock instability problems. Instabilities of rock masses along the valley are triggered by topography, weathering, man-made and earthquake activities. Discontinuous limestone located at the west side of the Mudurnu valley is susceptible to complex kinematic failures resulting from the combin...
Citation Formats
A. G. Yardımcı and C. Karpuz, “Prediction of failure mode in weak rock slopes using fuzzy slope mass rating,” Foz do Iguaçu; Brazil, 2020, p. 3667, Accessed: 00, 2021. [Online]. Available: