REVIEW ON SLOPE STABILITY ANALYSIS AND EVALUATION (original) (raw)
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Trend analysis in assesment and prediction of slope stability in open coal mines
2011
Geotechnical analysis of the condition of slope stability of excavation blocks in the open coal mine allows to define the safety assessment and prediction of the ongoing process of exploration and planning in future development. Subject of research in this paper will be geotechnical analyze of working environment covered with everyday exploitation and already completed benches. In this paper will be performed comprehensive analysis of several distinctive sections. We used the information from monthly reports of geotechnical stability of excavated blocks in the period from April 2009 to December 2010. The primary goals of the research area is a function of calculating, assessing, analyzing and prediction the geotechnical stability of final slopes of the coal open pit mine. Accordingly, the goals of the research in this paper, in accordance with the basic task of main plane of the coal mine, will be:-Determination of the coefficient of stability;-Assessment of the stability of excavation blocks;-Analysis of the slope stability of working and final benches;-Trend analysis and prediction of assessing the slope stability and-Conclusion and suggestion for further research
Stability Analysis and Failure Mechanisms of Open Pit Rock Slope
Journal of the Civil Engineering Forum
Rock mass in nature tend to be unideal, for it is heterogeneous, anisotropic and has discontinuity. The discontinuity makes anisotropic strength and stress in the rock mass, and also controls the changing of the elastic properties of rock mass. This condition results to disruptions in the rock mass strength balance, and finally drives the slopes to collapse. This study aims to determine the slope failure mechanisms in the area of case study, as well as its variations based on the Rock Mass Rating (RMR), Geological Strength Index (GSI), Slope Mass Rating (SMR), kinematic analysis, numerical analysis and monitoring approach slope movement in a coal mine slope applications. The site investigations were implemented to obtain information about slope collapse. Prior to the collapse, the slope inclination was 38° with of 94 meters height, strike slope of N 245 E and direction of slope surface of 335°. After the collapse, the slope was became 25º; and after the collapse materials were clear...
Assessment of the Stability of a Rock Slope by Using Different Methodologies
Engineering Geology for Society and Territory - Volume 2, 2015
The action of the geodynamic agents (external and/or internal), or even the human activities, can cause changes in the structure of a slope that may result in an imbalance between the internal and the external forces acting on the ground. The aim of this study is the analysis of the stability of a natural rock slope located along the Távora river, Northern Portugal. The geological mapping of the area and the use of stereonet to determine the main sets of joints were the starting point for the performed analysis. It was complemented with the study of different factors regarding the stability of the rock mass. The geomechanical characterization of the rock mass was also used, with the application of Bieniawski and Romana ratings. The methodologies applied proved to be a simple but effective way to describe the potential behavior of the rock mass with respect to the probability of occurrence of slope movements.
Rock Slope Stability Analysis by Using Integrated Approach
World Journal of Engineering and Technology, 2020
Slope stability assessment is an essential aspect of mining and civil engineering. In this study, Songwe open-pit mine in Malawi was investigated to establish possible pit slope instability. In performing the analysis, an integrated approach entailing rock mass characterisation, kinematic and numerical methods were applied. Based on rock mass classification system, Songwe Hill carbonatite rock mass is characterised as a good rock but still it possesses numerous random discontinuities that present a complex challenge in geotechnical engineering. Dip 6.0 software was used in carrying out kinematic analysis based on the attributes of discontinuities. The results show that there is a 16% likelihood of planar failure in the divided slope sections of the planned pit. Thus, slope angle optimisation to 41° has been proposed as a counter-measure to minimise the potential risk of planar failure. At the optimised angle, the risk of planar failure could be reduced by 44%. On the other hand, wed...
Complex investigation and analysis of a rock slope using different empirical methods
2019
Nearly 30 m high rock slope construction was necessary in soft rock condition during the construction of main road No. 21 in Hungary. Using rock mechanical laboratory test results, two different empirical rock classes (Slope Mass Rating-SMR and Q-slope) were applied to calculate the stability of the rock slope. For these calculations, the angles between the fracture geometries and the geometry of the rock cut should be taken into account to assume both very favourable and very unfavourable conditions. The analysis have shown that in unfavourable conditions the slope may be affected by sliding and a significant deterioration of the slope's rock material may occur due to weathering.
New Approach to Assesment of Slope Stability on Working Bench in Open Coal Mines
2011
The main purpose of this paper is to analyze the stability of the open coal mine "Suvodol" in Southwest Macedonia, during the past two years (from April 2009 to December 2011), also to represent one new approach for assessment of slope stability of working benches on open coal mines.In the first half of 2009 the open pit mine had an alarming situation where the whole bed moved about 1 cm per day from the Southeast towards to the Northwest so that this situation be conveyed directly in the operation of this mine. To resolve this situation needed further analysis of the stability of the working benches, development of new work plans of method of excavation of coal and overburden in mine and very carefully monitoring the situation on the ground and monitoring the system of cracks that had occurred this time. In this paper will be performed comprehensive analysis of 8 distinctive profiles. We used the information from monthly reports of geotechnical stability of excavated blocks in the period April 2009 to December 2010. New analyses will be done with four regression analysis: linear, polynomials of second and third degree and logarithmic, obtained analytical expressions of the stability factor as a function of time. Overall, stability in the open coal mine during data were taken for analysis (the period provide with trend analysis), is with the value of ratio of stability to almost all sections, of under 1, and going month after month, with a slight increase up even above 1.3 (an increase by 40%). This trend coincided with the trend analysis of new approach made in research analysis in this paper.
Factor of Safety and Reliability Analysis of Rock Slope using GEO5 Software
The entire earth consist of so many varieties of rock minerals which compositely for an entire rock mass which may be natural or artificial rock slopes which are at the level of the ground itself or it may be a deepest cuts or the hill slopes above the ground level. The factor of safety plays a major role in rock slope analysis. Due to the uncertainty involved in the calculation of rock parameters the application of factor of safety is widely used in analysis. Theses factor of safety are determined here by using Geo5 demo version software based on the uncertainty involved in the various rock parameters. The simple reliability analysis will provides the means of combined effect of uncertainty involved in calculations. The additional parameters such as standard deviation, mean, reliability index are used to determine the probability of failure of the rock slope. This probability of failure will helps to determine the reliability of the rock slope which in turn gives the idea of the stability of rock slope for any future recommendations regarding the actions for their stability.
Study of Slope Stability (Open Pit Mining, Algeria)
International Congress and Exhibition" Sustainable Civil Infrastructures: Innovative Infrastructure Geotechnology", 2017
The objective of our work is the study of the influence of the dynamic load due to the use of the explosive in the stability of the slope of an open pit mine, for this purpose we used the method of limit equilibrium to calculate the value of the safety factor through the geotechnical software SLIDE. On the one hand the calculation was carried out under static loading and on the other hand the dynamic loading is taken into account, which allowed us to conclude that the dynamic load influences the safety coefficient. Finally, a proposal to stabilize the slope at through a reprofiling of the bench is presented.
Brazilian Journal of Geology
The Geological Strength Index (GSI) system is the basis of parameters used in the Hoek-Brown failure criterion for rock mass strength estimation. The author tested this system and here suggests a modified GSI called Geological Strength Indexslope (GSI slope). The modified system combines two different existing approaches: the GSI system and Slope Mass Rating (SMR). The purpose of GSI slope is to allow engineering geologists to quickly evaluate the stability of natural and excavated slopes or open-pit mining in the field. GSI slope is computed by subtracting a constant value of 10 and the multiplication of adjustment factors for discontinuity orientation and slope (F1, F2, and F3, based on the parallelism of discontinuity and slope, discontinuity dip angle, and the difference between the inclination angle of discontinuity and slope) from GSI, and adding field groundwater rating to it. Modified curves are also proposed in this work to determine the accurate ratings of the adjustment factors. The results of this work are compared to the values obtained from equations of continuous-SMR and SMR-value itself for both the adjustment factors and GSI slope values. The comparison showed that the proposed curves and GSI slope equation are valid and easy to use for estimating the adjustment factors' ratings and GSI slope value.