Rock Slopes Processes and Recommended Methods for Analysis

Alzo’ubi, Abdel Kareem

doi:10.21660/2016.25.34052

Cited by 10 publications

(7 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In nature, rock slopes are highly heterogeneous and are associated with many unknowns such as the state of the stress, the structures inside the rock mass, and the strength parameters. These factors among others control the analysis and design of rock slopes and failure mechanisms (Alzo'ubi, 2016a).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, in near-surface rocks such as in rock slopes and shallow rock structures, the low con nement stress environment dominates the stress state and the discontinuities are usually open non-persistent ones that lead to stress ow around the joints and tensile stress concentrations. So, many researchers conducted uniaxial compressive tests with or without monitoring the displacement (see Alzo'ubi 2016b) to understand the behavior of jointed rock mass and the stresses responsible for causing the bridge's failure at low con nement stress. This paper aims to examine if the tensile strength and frictional strength are dependent on each other (Model 1), i.e.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Modeling of Independent versus Dependent Tensile -Frictional Strength Behavior of Synthetic Rocks with Non-continuous joints

Alzo’ubi

Mughieda

Kewalramani

2021

Preprint

View full text Add to dashboard Cite

The failure mechanisms of non-continuous jointed rocks under compression loading is of great importance for the rock mechanics community; it plays an important role in understanding the fracturing pattern, the type of the fractures, and the strength of the rock mass under investigation. In this paper, the relationship between the tensile and frictional strength of jointed rock samples is investigated by numerical modeling. Previously tested samples were used to simulate the behavior of artificial jointed rock numerically under axial loading by using two strength criteria; the first assumes that tensile failure reduces shear strength parameters to their residual values (dependent behavior, Model 1) and the second assumes that tensile failure will not cause the shear strength parameters to be reduced to their residual values (independent behavior, Model 2). The numerical model, in this paper uses, Mohr-Coulomb shear strength criterion with parameters of cohesion, friction, and tensile strength cut-off as tested in the laboratory. These artificial rock samples contains open-joints with the same inclination but with different bridge’s inclinations of 45°, 60°, and 75°. These samples were tested in the laboratory under incremental uniaxial loading until failure while monitoring displacement and rupturing development. As the stress concentration increased, curvilinear yielding (wing crack) started near or at the joint tips and propagated and stopped or coalesced to form a continuous rupture surface. The numerical model showed that tensile stress concentration caused wing crack initiation due to stress flow around the pre-existing non-persistent open joints. The yielding behavior of the numerical simulations - under the two tensile strength failure criteria - and the laboratory tests shows good agreement for the three samples. However, when the shear strength and tensile strength parameters are independent, the results showed strong and significant agreement between the laboratory tests and the numerical models in terms of the yielding path, width of failure zone, and the uniaxial strength. In this all compressive load environment, stress flow caused tensile stress concentration near the joint tip and according to the results of this paper the tensile yielding should not force the shear strength parameters to go to their residual values.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Independent versus Dependent Tensile -Frictional Strength Behavior of Synthetic Rocks with Non-continuous joints

Alzo’ubi

Mughieda

Kewalramani

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Kinematic methods have an advantage of being relatively simple in application. However, they only suggest the potential for failure, but do not provide slope stability condition in quantitative terms [5]. Although, these methods are cardinal prior to application of other quantitative methods.…”

Section: Introductionmentioning

confidence: 99%

UDEC-based stability analysis of jointed bedding slope and slope parameter optimization suggestions: a case study

Kalililo

Xia

2020

SN Appl. Sci.

View full text Add to dashboard Cite

The major hazard in open pit mining is ground movement resulting from the instability of the mining slopes. Among the factors that influence slope instability, external loads from earthquake and rainfall are of serious concern. In this paper, the conventional and numerical methods of slope stability study have been used to investigate the stability of the designed mining slopes and subsequent optimization of the slope parameters at Tanjiashan mine in P.R. China. The mine is on a rugged terrain with complex geology having bedded rock strata with highly developed joints. The simulation to understand the stability of the overall slope (before and after mining) was explored using UDEC software by considering four working conditions: natural, natural + earthquake, heavy rainfall, and heavy rainfall + earthquake. Rocscience DIPS software was used for the kinematic feasibility study to determine the failure mechanisms in the slope forming rock masses. SLIDE and SWEDGE software were used to determine the factor of safety for expected sliding and wedge sliding blocks and subsequent optimization of step slope angles in the different slope forming rock masses. It was established that the overall natural slope is stable. However, the overall mining slope is not stable due to the steepness of the step slopes which allow for the bedding planes (planes of weakness) to daylight on the slope faces. The compression shear bi-planar sliding is the potential failure mechanism. The optimization of the step slopes angles by rock formation resolved the instability problem on the overall mining slope.

show abstract

“…These fine sediments generally made of clay, sand or silt constitute what is known as rock infill. With the presence of these infills, the strength of the rock joint will be affected and both the cohesion and the friction angle at the interface will vary according to the infill properties [3,4].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Clay-Like Materials Plasticity Used as Infills, on Jointed Rocks Mechanical Behavior

William¹

2019

GEOMATE

View full text Add to dashboard Cite

The Rock mass is often described as an anisotropic material with several discontinuities within its structure ranging from joints, bedding plans to faulting. In the present study, the effects of infills plasticity on rock mass behavior during failure were investigated. Thus, a series of experiments have been conducted on both soils and cement blocks reconstituted to reflect jointed rock behavior. Different soil materials (obtained by mixing clay and sand) were subject to the cone penetration test and the unconsolidated undrained triaxial test to determine their plasticity index and their unconfined compressive strength. Then, several jointed blocks using the aforementioned soil materials as infill were subject to a uniaxial compression test to assess their maximum stress and investigate their deformation and failure mode. Results showed that stiffer infills would induce a more brittle behavior in the jointed rock while softer infills would instead favor rock deformation and a sharp decrease of its strength. It was also observed that both infill' cross-section and thickness will affect the rock resistance but its deformation will largely be influenced by the later. In the end, some law equations were proposed to draw the mathematical relationship between the jointed rock maximum stress, its deformation at failure and the infill plasticity.

show abstract

Rock Slopes Processes and Recommended Methods for Analysis

Cited by 10 publications

References 26 publications

Numerical Modeling of Independent versus Dependent Tensile -Frictional Strength Behavior of Synthetic Rocks with Non-continuous joints

Numerical Modeling of Independent versus Dependent Tensile -Frictional Strength Behavior of Synthetic Rocks with Non-continuous joints

UDEC-based stability analysis of jointed bedding slope and slope parameter optimization suggestions: a case study

The Influence of Clay-Like Materials Plasticity Used as Infills, on Jointed Rocks Mechanical Behavior

Contact Info

Product

Resources

About