The analysis of slope stability and optimized slope angle for the open-pit mining of a porphyry copper mine

2014 ◽  
pp. 487-492
Keyword(s):  
Slope Stability ◽  
Porphyry Copper ◽  
Slope Angle ◽  
Open Pit ◽  
Open Pit Mining ◽  
Copper 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.

scholarly journals Multi-level and Precise Evaluation of Slope Stability in Large Open-pit Mines: a Case Study at Dexing Copper Mine, China

2021 ◽  
Author(s):  
Shigui Du ◽  
Charalampos Saroglou ◽  
Yifan Chen ◽  
Hang Lin ◽  
Yong Rui
Keyword(s):  
Slope Stability ◽  
Limit Equilibrium ◽  
Equilibrium Analysis ◽  
Open Pit ◽  
Estimation Methods ◽  
Open Pit Mining ◽  
Copper Mine ◽  
Mine Slope ◽  
The Stability

Abstract As the mining industry developed significantly in the last decades and the depth of open-pit mining has increased, the stability of large open-pit slopes has become a major problem directly related to the safety production and development of a mine. However, the overall slope is indeed safer than the local slope based on the existing stability estimation methods. So the existing methods of directly analyzing the stability of the overall slope will produce some errors in the calculation results of the safety factor, and cannot comprehensively reflect the stability of the mine slope. Based on these problems, this paper adopted the idea of gradual analysis and the precise determination of discontinuity properties to perform a limit equilibrium analysis for the evaluation of mine slope stability. A case study slope, referred to as Yangtaowu Slope in Dexing Copper Mine, was selected for the demonstration of the accuracy of this approach. The results indicate that the adopted method can accurately reflect the actual stability of the slope, especially when the mine slope is near the critical state of stability.

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

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 

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. 

GIS-Based Slope Stability Analysis, Chuquicamata Open Pit Copper Mine, Chile

2007 ◽  
Vol 16 (2) ◽  
pp. 171-190 ◽  
Author(s):  
Eric P. Nelson ◽  
Katherine A. Connors ◽  
Claudio Suárez S.
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Slope Stability Analysis ◽  
Open Pit ◽  
Copper Mine

General concept of determining the parameters of non-mining walls of ultra-deep diamond deposits development open pits

2021 ◽  
pp. 48-53
Author(s):  
I. V. Zyryanov ◽  
A. N. Akishev ◽  
I. B. Bokiy ◽  
N. M. Sherstyuk
Keyword(s):  
Rock Mass ◽  
Structural Relaxation ◽  
Slope Angle ◽  
Field Tests ◽  
Friction Angle ◽  
Strength Properties ◽  
Strength Characteristics ◽  
Open Pit ◽  
Open Pit Mining ◽  
Relaxation Coefficient

A specific feature of open pit mining of diamond deposits in Western Yakutia is the construction of the open pits in the zone of negative ambient temperatures, which includes thick permafrost rock mass, and which is at the same time complicated by the influence of cryogenic processes on deformation of pit wall benches. The paper presents the comparative analysis of strength characteristics in frozen and thawed rocks, stability of benches during mining, the general geomechanical approach to the determination of parameters of non-mining walls of the ultra-deep open pit diamond mines, and the parameters of nonmining walls and benches. Optimization of open pit wall configuration should primarily be based on the maximum utilization of the strength properties of frozen rocks in combination with the development of new approaches, calculation schemes and methods for assessing stability of open pit walls and benches of unconventional design, including the non-mining vertical benches. The main design characteristic that determines the parameters of open pit walls is the structural tectonic relaxation coefficient, which specifies the calculated value of cohesion in rock mass. For the diamond deposits, the values of the structural relaxation coefficient were obtained in a series of field tests and back calculations. Full-scale tests were carried out both during exploration operations in underground mines and in open pits. The accuracy of determining the values of the structural relaxation coefficient in the range of 0.085–0.11 is confirmed by the parameters of non-mining walls in an open pit mine 385–640 m deep, with overall slope angles of 38–55° and a steeper H 0.35–0.5 lower part having the slope angle of up to 70° with average strength characteristics of 7.85–11.84 MPa and the internal friction angle of 28.1–37.4°. Using the natural load-bearing capacity of rock mass to the full advantage, which the values of the structural relaxation coefficient of deposits show, allows optimization of open pit wall slope design and minimization of stripping operations.

scholarly journals ANALISIS KESTABILAN LERENG HIGHWALL MENGGUNAKAN METODE BISHOP SIMPLIFIED PADA PIT 13 PT BELAYAN INTERNASIONAL COAL KECAMATAN MARANGKAYU KABUPATEN KUTAI KARTANEGARA

2021 ◽  
pp. 46-54
Author(s):  
Muhammad Amin Syam ◽  
Heriyanto Heriyanto ◽  
Hamzah Umar
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Safety Factor ◽  
Slope Angle ◽  
Stable Condition ◽  
Physical And Mechanical Properties ◽  
Slope Stability Analysis ◽  
Open Pit ◽  
Mining Company ◽  
Water Saturated

PT Belayan Internasional Coal is an open-pit system mining company, one of its geotechnical activities is the construction of the slopes. Slope stability analysis used the Bishop Simplified method to obtain the value of the dynamic safety factor (≥ 1,1). Currently, the value of the Safety Factor (FK) is an indicator in determining whether the slope is stable or not. The parameters used in the slope stability analysis are the physical and mechanical properties of the rock, namely weight (ɣ), cohesion value (c), and internal shear angle (∅). From the results of dynamic overall slope calculations, the recommended overall slope is constructed with an individual slope angle of 55°, a bench width of 5 meters, a height of 10 meters, and the number of individual slopes of 8 slopes. This design will produce dimensions of the overall slope with 41° slope angle, 80 meters high, and has a dynamic safety factor value of 1,102 with the water-saturated condition. Thus, the slopes are in stable condition.

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