Discrete Element Modelling of Complex Failure Mechanism at Quarry Slope

2015 ◽  
Vol 72 (3) ◽  
Author(s):  
Rini A Abdullah ◽  
Mohd For Mohd Amin ◽  
Ahmad S.A. Rashid ◽  
S.M. Yahya
Keyword(s):  
Slope Stability ◽  
Failure Mechanism ◽  
Rock Slope ◽  
Water Pressure ◽  
Research Work ◽  
Slope Angle ◽  
Discrete Element ◽  
Slope Instability ◽  
Open Pit ◽  
Open Pit Mining

Road cutting, open pit mining, quarrying and various other constructions in hilly terrain demand special attention in terms of slope stability. The analysis of slope stability is of great significance not only for ensuring safe design of excavated slope, but also for preventing potential hazards. This research was undertaken to identify the controlling parameters affecting the slope instability. As the rock slope behaviour is mostly governed by discontinuities, discontinuum numerical technique such as Discrete Element Method (DEM) which has the ability to address discontinuity controlled instability is well suited for this case. This study investigated the failure pattern and its responsible factors leading to failure of a slope at a slate quarry situated in Wales, United Kingdom as a case study. The research work consisted of field investigation, laboratory experiments and parametric analysis by powerful and renowned distinct element computational tool Universal Discrete Element Code (UDEC). Evidence showed that complex failure mechanism involving distinct planar sliding surface along with block-flexural toppling contributed to the instability at the studied slate quarry. Dip of discontinuity, presence of water, weathering state and slope angle were the significant factors found in this study to have profound impact on controlling rock slope instability. The modelling results also indicated that the influence of structurally dipping at 78° of cleavage in slate and the water filling in the crack which developed excess water pressure have triggered the failure. 

Rational Research of Deep Concave Open-Pit Slope Angle of Lower Part

2014 ◽  
Vol 716-717 ◽  
pp. 248-251
Author(s):  
Xiao Long Ma ◽  
Guang Zhang ◽  
Qing Guo Ren ◽  
Xiu Ling Jiang
Keyword(s):  
Slope Stability ◽  
Research Work ◽  
Slope Angle ◽  
Mineral Resources ◽  
Research Direction ◽  
Economic Benefits ◽  
Open Pit Mine ◽  
Open Pit ◽  
Future Research ◽  
Factors Affecting

With the rapid advance of industrialization,the consumption of mineral resources is increasing.For open pit mine,many of them went into deep mining.The current,widespread adoption of open pit slope angle makes deep concave mining has a huge stripping ratio.So many mines in trouble,on the premise of guarantee the deep sunken open pit slope stability increase slope toe can bring huge economic benefits,and a lot of research work has been done.This paper describes the factors affecting the stability of open-pit mine slope,the slope rock mass stress analysis,to calculate the lower steep slope economic benefits,puts forward reasonable suggestions the future research direction of the slope stability of open-pit mine.

scholarly journals Study on shaping slope stability of dump in eastern grassland open-pit mine

2020 ◽  
Vol 194 ◽  
pp. 04043
Author(s):  
Guo Xiaoli ◽  
Yan Jiancheng ◽  
Li Xueliang ◽  
Wen Xin ◽  
Li Xingli
Keyword(s):  
Slope Stability ◽  
Slope Angle ◽  
Mining Area ◽  
Open Pit Mine ◽  
Open Pit ◽  
Open Pit Mining ◽  
Dump Slope ◽  
The Stability ◽  
Step Type ◽  
Mine Dump

The dumps in the open-pit mining area in the eastern grassland are prone to landslides due to the fragile ecological environment, so it is inevitable to reshape the dump slopes. In order to explore a more scientific method for slope shaping of open-pit mine dump, slope stability analysis were used to compare effect of three types of slope-type (wave-shaped, slope-shaped and step-shaped slope shaping method)in outside dumping site of Baori Hiller open-pit mine. The results show that the slope stability is negatively correlated with the slope angle, and the stability of different shaping slopes is realized as wave-shaped slope (F=2.711)> Slope-shaped slope(F=2.513)>Step-shaped slope(F=1.047), in which the wave type and slope type are all within the safe range, but the step type slope is unstable; in consideration of cost, stability and erosion resistance, it is better to set the slope angle of the dump to 15°.The wave-shaped shaping method of the natural dumping of the excavation field outside the Baori Hiller open-pit mine has the best effect and is worth promoting.

scholarly journals ANALISIS BENTUK GEOMETRI TERHADAP STABILITAS LERENG PADA TAMBANG TERBUKA DARI ASPEK GEOTEKNIK

2020 ◽  
Vol 3 (2) ◽  
pp. 166-176
Author(s):  
Lisa Fianti ◽  
Munirwansyah Munirwansyah ◽  
Halida Yunita
Keyword(s):  
Slope Stability ◽  
Soil Depth ◽  
Slope Angle ◽  
Geometric Shape ◽  
Open Pit ◽  
Open Pit Mining ◽  
Primary Data ◽  
Soil Parameters ◽  
Soil Parameter ◽  
The Stability

Aceh Province is one of the coal producers, especially Sumber Batu Village in Meurebo District, West Aceh Regency. In the implementation of coal mining, it is necessary to pay attention to the slope stability of open-pit mining to identify and estimate the possibility of landslides. For this reason, the author conducted research in analyzing the geometric shape of the slope stability with the slope variance of modeling the reduction of the existing angle αeks - 10% to the depth of three layers of soil 11 meters. The 1st layer of soil is 1.5 meters, the second layer of soil is 2.5 meters, and the third layer of soil is 7 meters. Slope stability is strongly influenced by the geometric shape of the slope and the strength of soil parameters. To identify the stability of the slope against slope failure, computationally performed using the finite element method with Plaxis software as the reference for the value of FK 1.25, which is considered safe/stable, meaning that collapse rarely occurs. In this research, primary data is used in the form of direct observation in the field, namely taking soil samples to obtain soil data in the form of soil physical properties and soil mechanical properties into soil parameter data, which is tested in the soil laboratory. Secondary data used are map data, boring data, and Sondir data. Soil parameter data were processed using Plaxis software. The results of the slope stability analysis showed that by modeling the geometric shape of the slope (αeks - 10%) on the open slope of a coal mine with a soil depth of 11 meters, the FK value was 3.60. From the results of the FK scores, it shows that the slope of the slope is 3.60 1.25 above the reference value of safe/stable FK. The FK value is 0.2 greater than the FK existing geometry. The conclusion of this study is that geometric shapes play an important role in determining the stability of an open coal pit excavation slope. The smaller the slope angle, the greater the FK value obtained, or the more gentle the slope, the higher the safety value of a slope.

Calculation and Optimization of Soil Slope Stability on One Iron Mine

2014 ◽  
Vol 644-650 ◽  
pp. 1998-2002
Author(s):  
Shi Qing Nan ◽  
Juan Xia Zhang ◽  
Xian Zhang Guo ◽  
Tian Hong Yang
Keyword(s):  
Slope Stability ◽  
Slope Angle ◽  
Simulation Method ◽  
Open Pit ◽  
Open Pit Mining ◽  
Soil Slope ◽  
Deformation And Failure ◽  
Main Research ◽  
Iron Mine ◽  
The Stability

The purpose of slope stability evaluation was that, according to the slope engineering condition and constraints of mining technology, to study the deformation and failure rule of slope occurred by the change of stress field during the open-pit mining. The main research object of the paper was open-pit slope of one iron mine, for the mechanical parameters of the slope, it was obtained by physical experiments, and the numerical simulation method was used for the stability analysis and evaluation of quaternary soil slope angle and final slope angle. And some measures were proposed for slope stability during construction to ensure safety in production. The research of the paper has certain reference significance for optimization calculation of the soil slope stability

The Study on Key Issues of Slope Instability during Turning Open-Pit into Underground Mining

2012 ◽  
Vol 594-597 ◽  
pp. 70-75
Author(s):  
Shi Guo Sun ◽  
Hong Yang ◽  
Chun Sheng Li ◽  
Bao Lin Zhang ◽  
Ai Wei Miao ◽  
...  
Keyword(s):  
Slope Stability ◽  
Underground Mining ◽  
Outer Region ◽  
Central Area ◽  
Geometric Dimension ◽  
Slope Instability ◽  
Open Pit ◽  
Open Pit Mining ◽  
Stability Coefficient ◽  
Mining Depth

During turning open-pit into underground mining, the state of slope stability is related to the relative space positional relationship between open-pit mining and underground mining. The toe area of slope is the most unfavorable area to slope stability and the outer region of slope is the most favorable area, while the central area of the slope has the most complicated effect on slope stability so that the mechanism of its influence can be understood only by the means of calculation. The slope stability coefficient decreases with the augment of underground mining geometric dimension. But it remains constant when the underground mining area is fully extracted. With the increase of mining depth, its range of influence on slope stability increases, which results in the decrease of slope stability coefficient. However, the slope stability coefficient tends to unchanged when the mining depth increases to some certain value.

scholarly journals ANALISIS PROBABILITAS KESTABILAN LERENG TAMBANG TIMAH PRIMER BLOK PEMALI, BANGKA, INDONESIA

2020 ◽  
Vol 1 (1) ◽  
pp. 463-474
Author(s):  
Teguh Nurhidayat ◽  
Edo Syawaludin ◽  
Muchtar Arifin ◽  
Iwan Oktariansyah
Keyword(s):  
Monte Carlo ◽  
Slope Stability ◽  
Cross Section ◽  
Slope Angle ◽  
Shear Angle ◽  
Open Pit ◽  
Open Pit Mining ◽  
Unit Weight ◽  
Strength Parameters ◽  
Laboratory Test Results

ABSTRAK Studi geoteknik sangat penting pada tambang terbuka untuk menentukan geometri lereng dan kestabilan lereng tambang. Kestabilan lereng pada tambang terbuka sangat mempengaruhi kelangsungan produksi dan keselamatan pekerja pada tambang tersebut. Pada kasus tambang timah primer, material pembentuk lereng yang terdiri dari batuan induk berupa granit dan tanah dekomposisi dari granit. Hal ini dapat memberikan masalah dalam penentuan parameter kekuatan material dan analisis yang digunakan. Karena  parameter kekuatan yang berasal dari dekomposisi granit mempunyai variabilitas yang tinggi. Metode deterministik tidak cukup untuk memodelkan kestabilan lereng pada tambang timah primer. Sehingga dilakukan perpaduan antara penggunaan metode deterministik dan probabilistik dalam proses analisis kestabilan lereng. Pemboran geoteknik dilakukan dengan cara full coring. Parameter sifat fisik dan mekanik material lereng didapat dari hasil pengujian laboratorium. Nilai internal shear angle, unit weight dan cohesion diproses dengan simulasi Monte Carlo sebagai model variabel acak. Simulasi Monte Carlo melakukan evaluasi secara simultan dari kestabilan lereng. Simulasi juga dilakukan dengan variasi sudut lereng keseluruhan dan proses pengeringan air tanah. Hasil simulasi memperlihatkan lereng pada penampang 1 dengan sudut lereng keseluruhan sebesar 25o (pada keadaan dinamik, SF= 1.216, PF= 8.1%, RI= 1.419)  dengan proses pengeringan air tanah, penampang 2 pada sudut lereng keseluruhan 35 o(pada keadaan dinamik, SF= 1.44 , PF= 0% , RI= 3.535)  dan Penampang 3 pada sudut lereng keseluruhan 15o (pada keadaan dinamik, SF= 1.469 ,PF= 13.7%, RI= 1.079).   Kata kunci: kestabilan lereng, probabilitas, timah primer  ABSTRACT Geotechnical studies are very important in open pit mining to determine the slope geometry and stability of the mine slope. Slope stability at an open pit greatly influences the continuity of production and the safety of workers at the mine. In the case of primary tin mining, slope-forming material consisting of host rock in the form of granite and soil decomposition of granite. It can give problems in determining the strength parameters and the modeling used. Because the strength parameters derived from granite decomposition have high variability. The deterministic method is not enough to model slope stability in primary tin mines. So it is a combination of the use of deterministic and probabilistic methods in the process of modeling the slope stability. Geotechnical drilling is done by full coring. The parameters of physical and mechanical properties of slope material are obtained from laboratory test results. Internal shear angle, unit weight and cohesion values are processed by Monte Carlo simulation as a random variable model. Monte Carlo simulations carry out simultaneous evaluations of slope stability. Simulations are also carried out with overall slope angle variation and groundwater dewatering. Simulation results show that the slope at cross-section 1 at overall slope angle(OSA) 25o (under dynamic condition, SF = 1,216, PF = 8.1%, RI = 1,419) with groundwater dewatering process, cross-section 2 at with 35o(OSA) (SF = 1.44, PF = 0%, RI = 3,535) and Section 3 at 15o (SF = 1,469, PF = 13.7%, RI = 1,079). Key word: slope stability, probability, primary tin 

scholarly journals Methodology to evaluate rock slope stability under seismic conditions at Solà de Santa Coloma, Andorra

2009 ◽  
Vol 9 (6) ◽  
pp. 1763-1773 ◽  
Author(s):  
O. Mavrouli ◽  
J. Corominas ◽  
J. Wartman
Keyword(s):  
Slope Stability ◽  
Rock Slope ◽  
Limit Equilibrium ◽  
Water Pressure ◽  
Slope Angle ◽  
Water Levels ◽  
Equilibrium Analysis ◽  
Rock Slope Stability ◽  
Ground Acceleration ◽  
Moderate Seismicity

Abstract. An analytical methodology is presented to evaluate rock slope stability under seismic conditions by considering the geomechanical and topographic properties of a slope. The objective is to locate potential rockfall source areas and evaluate their susceptibility in terms of probability of failure. For this purpose, the slope face of a study area is discretized into cells having homogenous aspect, slope angle, rock properties and joint set orientations. A pseudostatic limit equilibrium analysis is performed for each cell, whereby the destabilizing effect of an earthquake is represented by a horizontal force. The value of this force is calculated by linear interpolation between the peak horizontal ground acceleration PGA at the base and the top of the slope. The ground acceleration at the top of the slope is increased by 50% to account for topographic amplification. The uncertainty associated with the joint dip is taken into account using the Monte Carlo method. The proposed methodology was applied to a study site with moderate seismicity in Solà de Santa Coloma, located in the Principality of Andorra. The results of the analysis are consistent with the spatial distribution of historical rockfalls that have occurred since 1997. Moreover, the results indicate that for the studied area, 1) the most important factor controlling the rockfall susceptibility of the slope is water pressure in joints and 2) earthquake shaking with PGA of ≤0.16 g will cause a significant increase in rockfall activity only if water levels in joints are greater than 50% of the joint height.

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