scholarly journals RESPONSE OF STABLE OVERALL SLOPE GEOMETRY OF OPEN PIT COAL MINE IN WARUKIN FORMATION TO DEWATERING AND PEAK GROUND SEISMIC IN SOUTH KALIMANTAN, INDONESIA

2016 ◽  
Vol 11 (1) ◽  
pp. 55-72
Author(s):  
Agus W Oscar ◽  
Ir. H. Dicky Muslim M.Sc. ◽  
Nana Sulaksana ◽  
Febri Hirnawan
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
Driving Force ◽  
Peak Ground Acceleration ◽  
Probabilistic Method ◽  
Open Pit ◽  
Ground Acceleration ◽  
Mine Slope ◽  
Broad Dimension ◽  
Regression Correlation

Understanding of the response of the mine slope stability is very important regarding the safety of life and investment / productivity / environment, as anticipation of landslide prevention based on the latest research. Mine slope behavior previously discussed widely in terms of the response due to dewatering and seismic (Peak Ground Acceleration) as well through verification. This paper aims to obtain a broad dimension of design criteria that are not only unstable slopes, but the slope is stable under various conditions of the rock mass saturation (dewatering) and seismic condition. Response of slope stability per geotechnical rocks unit from different formations or any engineering formation as a result of environmental influences, for example, the same quake, will be different. This means that the geometry of the same slope in other formation will have different stability conditions (safety factor of the slope) due to the same seismic acceleration. This is also similar due to dewatering. The method used for this study is the deductive-probabilistic method with a hypothetical verification approach. The Standard statistical analysis is used to test the data normality and homogeneity, average and independent differences, as well as regression-correlation test. The research results show that dewatering activitycan decrease ground water level (GWL/MAT) of the slope, so the durability of sliding along the sliding plane is reduced (increasing slope safety factor). At the same time earthquake reduces shear strength and increases driving force, so the safety factor of the slope suddenly downs. Slope stability decreased due to the earthquake, but dewatering improves slope stability. Thus, the slope in dewatering conditions will be kept stable through simulation to anticipate earthquake.

scholarly journals Case Study on Slope Stability Changes Caused by Earthquakes—Focusing on Gyeongju 5.8 ML EQ

2018 ◽  
Vol 10 (10) ◽  
pp. 3441 ◽  
Author(s):  
Sangki Park ◽  
Wooseok Kim ◽  
Jonghyun Lee ◽  
Yong Baek
Keyword(s):  
Slope Stability ◽  
South Korea ◽  
Safety Factor ◽  
Peak Ground Acceleration ◽  
Construction Projects ◽  
Slope Failure ◽  
Ground Acceleration ◽  
Property Data ◽  
Gyeongju Earthquake ◽  
Slope Safety

Slope failure is a natural hazard occurring around the world and can lead to severe damage of properties and loss of lives. Even in stabilized slopes, changes in external loads, such as those from earthquakes, may cause slope failure and collapse, generating social impacts and, eventually causing loss of lives. In this research, the slope stability changes caused by the Gyeongju earthquake, which occurred on 12 September 2016, are numerically analyzed in a slope located in the Gyeongju area, South Korea. Slope property data, collected through an on-site survey, was used in the analysis. Additionally, slope stability changes with and without the earthquake were analyzed and compared. The analysis was performed within a peak ground acceleration (PGA) range of 0.0 (g)–2.0 (g) to identify the correlation between the slope safety factor and peak ground acceleration. The correlation between the slope safety factor and peak ground acceleration could be used as a reference for performing on-site slope stability evaluations. It also provides a reference for design and earthquake stability improvements in the slopes of road and tunnel construction projects, thus supporting the attainment of slope stability in South Korea.

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.

scholarly journals Peak ground acceleration at surface for Mataram city with a return period of 2500 years using probabilistic method

2018 ◽  
Vol 195 ◽  
pp. 03019
Author(s):  
Rian Mahendra Taruna ◽  
Vrieslend Haris Banyunegoro ◽  
Gatut Daniarsyad
Keyword(s):  
Seismic Hazard ◽  
Return Period ◽  
Peak Ground Acceleration ◽  
Subduction Zones ◽  
Amplification Factor ◽  
Hazard Analysis ◽  
Probabilistic Method ◽  
Seismic Zone ◽  
Ground Acceleration ◽  
Back Arc

The Lombok region especially Mataram city, is situated in a very active seismic zone because of the existence of subduction zones and the Flores back arc thrust. Hence, the peak ground acceleration (PGA) at the surface is necessary for seismic design regulation referring to SNI 1726:2012. In this research we conduct a probabilistic seismic hazard analysis to estimate the PGA at the bedrock with a 2% probability of exceedance in 50 years corresponding to the return period of 2500 years. These results are then multiplied by the amplification factor referred from shear wave velocity at 30 m depth (Vs30) and the microtremor method. The result of the analysis may describe the seismic hazard in Mataram city which is important for building codes.

scholarly journals Rancangan Geometri Rencana Lereng Akhir Waste Dump terhadap Displacment Batuan Dasar Area Waste Dump PT X Kecamatan Palimanan, Kabupaten Cirebon, Provinsi Jawa Barat

2021 ◽  
Vol 1 (1) ◽  
pp. 22-29
Author(s):  
Rana Antariksa D ◽  
Yuliadi ◽  
Zaenal
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Slope Stability ◽  
Safety Factor ◽  
Open Pit ◽  
Open Pit Mining ◽  
Waste Dump ◽  
Value Analysis ◽  
Total Displacement ◽  
Element Method

Abstract. PT X is a company engaged in the cement factory industry in West Java that uses an open-pit mining system with limestone mining. X is planning the location of waste dump placement using the in-pit dump method, so a safe and efficient final slope design is needed. For optimal stockpiling activities, slope geometry planning on the waste material dump needs to be carried out slope stability analysis. Slope stability is influenced by slope height, slope angle, rock mass strength, rock type, and groundwater level. The purpose of this research is to find out whether or not a slope is stably displayed in the Safety Factor (FK) value. Analysis process is carried out using the Finite Element Method and the Boundary Equilibrium Method. The analysis was carried out on bedrock and pile material. Analysis of bedrock using Finite Element Method in the Goa area in Sections A - B and C - D obtained SRF values ​​of 4.6 and 16 with a total displacement of 13,771 m and 6 m. In the area of ​​Mount Bindis Section E - F and G - H obtained SRF values ​​of 2.5 and 4.75 with a total displacement of 11.8 m and 3 m. Analysis of the embankment material in the Goa In areas with Sections A - B and C - D FK values ​​obtained = 2.11 and 1.56 and for Section C - D FK 2.62 and 1.94. In the Mount Bindis Area with sections E - F and G - H FK values ​​= 1.59 and for Section G - H FK values ​​= 2.31 and 1.57. The disposal obtained the amount of volume that will be accommodated in each area of ​​11,175,191.19 LCM and 74,749,919.45 LCM. Abstrak. PT X adalah perusahaan yang bergerak di industri pabrik semen di Jawa Barat yang menggunakan sistem penambangan terbuka dengan penambangan batu kapur. X sedang merencanakan lokasi penempatan pembuangan limbah dengan menggunakan metode pembuangan di dalam pit, sehingga diperlukan desain lereng akhir yang aman dan efisien. Untuk kegiatan penimbunan yang optimal, perencanaan geometri lereng pada tempat pembuangan bahan limbah perlu dilakukan analisis stabilitas lereng. Stabilitas lereng dipengaruhi oleh ketinggian lereng, sudut lereng, kekuatan massa batuan, jenis batuan, dan tingkat air tanah. Tujuan dari penelitian ini adalah untuk mengetahui apakah kemiringan secara stabil ditampilkan dalam nilai Safety Factor (FK). Proses analisis dilakukan dengan menggunakan Metode Elemen Hingga dan Metode Kesetaraan Batas. Analisis dilakukan pada material batuan dasar dan tiang pancang. Analisis batuan dasar menggunakan Metode Elemen Hingga di daerah Goa di Bagian A - B dan C - D memperoleh nilai SRF 4,6 dan 16 dengan total perpindahan 13,771 m dan 6 m. Di daerah Gunung Bindis Bagian E - F dan G - H diperoleh nilai SRF 2,5 dan 4,75 dengan total perpindahan 11,8 m dan 3 m. Analisis bahan timbunan di Goa Di daerah dengan Bagian A - B dan C - D nilai FK diperoleh = 2.11 dan 1.56 dan untuk Bagian C - D FK 2.62 dan 1.94. Di Wilayah Gunung Bindis dengan bagian E - F dan G - H nilai FK = 1,59 dan untuk Bagian G - H nilai FK = 2,31 dan 1,57. Pembuangan memperoleh jumlah volume yang akan ditampung di masing-masing area 11.175.191 LCM dan 74.749.919,45 LCM.

Numerical Study of Plastic Strains on Slope Instability

2012 ◽  
Vol 548 ◽  
pp. 363-366
Author(s):  
Mao Hu Wang ◽  
Zhen Liang Xu
Keyword(s):  
Finite Element ◽  
Slope Stability ◽  
Safety Factor ◽  
Numerical Study ◽  
Limit Equilibrium ◽  
Strength Reduction ◽  
Slope Instability ◽  
Open Pit ◽  
Instability Criterion ◽  
Incremental Search

This article simulates an open pit slope stability using the ANSYS software, which is based on the finite element strength reduction theory, three kinds of slope instability criterion of the strength reduction method are applied to judge whether the slope is on the limit equilibrium state, the incremental search method is used to search the safety factor of the slope stability, and the results show that, the slope body damages when the plastic zone developed from the top to the bottom, in the numerical simulation the finite element iteration calculation didn’t just converge, the corresponding former level of reduction factor is the safety factor, This article can have a guiding significance on the safety production of the open-pit mine.

scholarly journals Slope Stability Analysis Based on Safety Factors on Slope CV. Mutiara Timur in Klampok Village, Tongas District, Probolinggo Regency

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Yazid Fanani ◽  
Aprilia Dwi Astuti ◽  
Andres Kevi Paki
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Safety Factor ◽  
Slope Stability Analysis ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining System ◽  
A Company ◽  
Rock Lithology ◽  
Safe Working

CV. Mutiara Timur is a company that is applying for a mining business permit for sirtu commodities in Klampok Village, Tongas District, Probolinggo Regency. The planned mining system is open pit mining using the quarry method. From the results of research in the field obtained rock lithology in the form of topsoil, gravel and sand. Where in the slope design later, the topsoil will be peeled off first. The purpose of slope stability analysis is to determine the geometry of the slope by taking into account the safety factor in order to create safe working conditions. Slope stability analysis on CV. Mutiara Timur using the Bishop method using the Slide v6.0 software. Based on the analysis carried out, the recommendation for slope geometry on a single slope is 4 meters high with a slope of 600 so that the no-load safety factor is 1.350 and the safety factor with load is 1.267. In addition, the slope geometry is obtained on the overall slope, which is a total height of 21 meters with a slope of 380 so that the no-load safety factor is 1.243 and the safety factor with the load is 1.239.

Numerical Simulation of Slope Stability in the First Mining of Open-Pit Coal Mine

2013 ◽  
Vol 807-809 ◽  
pp. 2371-2377
Author(s):  
Guang Yi Sun ◽  
Xiao Luo
Keyword(s):  
Numerical Simulation ◽  
Steady State ◽  
Slope Stability ◽  
Coal Mine ◽  
Paper Analysis ◽  
Open Pit ◽  
Stress And Strain ◽  
Safety Coefficient ◽  
Mine Slope ◽  
Mining Slope

This paper analysis open-pit coal mine slope stability in the first mining with FLAC3D, reveal the mechanism of slope deformation, through analysis the stress and strain nephogram of model ZK8 of the first mining slope, and calculation safety stability coefficient, finally concluding stope slope of the first mining occur slip as circular form under their own gravity. The safety factor of model ZK8 is more than stope slope safety coefficient 1.20, slope is in steady state, obtained the accurate and reliable analysis results of stability.

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.

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