scholarly journals Geotechnical characteristics of unburnt colliery spoils after coal-recovery

2019 ◽  
Vol 262 ◽  
pp. 04006
Author(s):  
Tymoteusz Zydroń ◽  
Andrzej Gruchot ◽  
Eugeniusz Zawisza
Keyword(s):  
Slope Stability ◽  
Test Results ◽  
Coal Basin ◽  
Geotechnical Parameters ◽  
Coal Recovery ◽  
Geotechnical Characteristics ◽  
Upper Silesian Coal Basin ◽  
Materials Used ◽  
The Stability ◽  
Wave Passage

The aim of the study was to determine the geotechnical characteristics of the unburnt colliery spoils after coal-recovery from the dumping site of one of the mines of the Upper Silesian Coal Basin in Poland. Due to grain-size distribution of tested spoils their geotechnical properties were determined using medium-sized apparatuses. In order to verify the suitability of the studied spoils for the construction of hydraulic embankments, the seepage and stability calculations were conducted for models of hydraulic embankments including the effect of flood wave passage on stress conditions within the construction and their slope stability. The test results revealed, that the studied colliery spoils are characterized by favourable values of geotechnical parameters and they fulfil the requirements for soil materials used in the analysed type of constructions. The spoils are characterized by good compactibility, relatively low water permeability and average susceptibility to mechanical disintegration, which in the case of using this material for the construction of hydraulic embankments and using proper compaction technology, should reduce their susceptibility to weathering. The results of seepage and slope stability calculations for hydraulic embankments built of the studied spoils confirmed their suitability for that type of constructions, retaining the proper inclination of slopes, whereas the variant of embankment without sealing is safer from the stability viewpoint.

scholarly journals On snow stability interpretation of extended column test results

2020 ◽  
Vol 20 (7) ◽  
pp. 1941-1953 ◽  
Author(s):  
Frank Techel ◽  
Kurt Winkler ◽  
Matthias Walcher ◽  
Alec van Herwijnen ◽  
Jürg Schweizer
Keyword(s):  
Slope Stability ◽  
Large Data ◽  
Stability Assessment ◽  
Test Results ◽  
Column Test ◽  
Secondary Importance ◽  
Data Set ◽  
Detailed Classification ◽  
Stable Conditions ◽  
The Stability

Abstract. Snow instability tests provide valuable information regarding the stability of the snowpack. Test results are key data used to prepare public avalanche forecasts. However, to include them into operational procedures, a quantitative interpretation scheme is needed. Whereas the interpretation of the rutschblock test (RB) is well established, a similar detailed classification for the extended column test (ECT) is lacking. Therefore, we develop a four-class stability interpretation scheme. Exploring a large data set of 1719 ECTs observed at 1226 sites, often performed together with a RB in the same snow pit, and corresponding slope stability information, we revisit the existing stability interpretations and suggest a more detailed classification. In addition, we consider the interpretation of cases when two ECTs were performed in the same snow pit. Our findings confirm previous research, namely that the crack propagation propensity is the most relevant ECT result and that the loading step required to initiate a crack is of secondary importance for stability assessment. The comparison with the RB showed that the ECT classifies slope stability less reliably than the RB. In some situations, performing a second ECT may be helpful when the first test did not indicate rather unstable or stable conditions. Finally, the data clearly show that false-unstable predictions of stability tests outnumber the correct-unstable predictions in an environment where overall unstable locations are rare.

Stability Analysis of Highway Tunnel Portal Slope in Shiyan Area

2011 ◽  
Vol 368-373 ◽  
pp. 2824-2827
Author(s):  
Sheng Li Liu ◽  
Wen Guang Zhao ◽  
Yang Zhang ◽  
He Jie Gao ◽  
Fang Wei Fu
Keyword(s):  
Slope Stability ◽  
Natural State ◽  
Test Results ◽  
Highway Tunnel ◽  
Management Measures ◽  
Geological Conditions ◽  
Mechanism Of Landslide ◽  
The Stability ◽  
Rock Strata ◽  
Tunnel Portal

Under the control of the tow-Yun fracture, the geological conditions are complicated and the rock strata is broken in Shiyan area ,in the northwest of Hubei province, and the rock mass is weathered into fragment. When Highway is built in this area, a lot of tunnel portal slope and landslide problems will be met. To properly solve these problems, it is needed to analyze the slope stability and to propose appropriate management measures. In the paper, taken a highway tunnel portal slope in Shiyan area for example, a detailed research was made on the mechanism of landslide formation, and using laboratory soil test results and the simple Janbu method, the local and global slope stability is calculated. The results show that the slope is stable in natural state, and in heavy rains the stability coefficient is reduced quickly and the slope will be sliding. So the slope needs to manage and the rain water needs to control.

scholarly journals Failure Analysis of Soil Slopes with Advanced Bayesian Networks

2019 ◽  
Author(s):  
Long Xue He ◽  
António Topa Gomes ◽  
Matteo Broggi ◽  
Michael Beer
Keyword(s):  
Slope Stability ◽  
Bayesian Networks ◽  
Slope Failure ◽  
Theoretical Background ◽  
Geotechnical Parameters ◽  
New Information ◽  
Different Types ◽  
Soil Slopes ◽  
The Stability ◽  
Geotechnical Problems

To prevent catastrophic consequences of slope failure, it can be effective to have in advance a good understanding of the effect of both, internal and external triggering-factors on the slope stability. Herein we present an application of advanced Bayesian networks for solving geotechnical problems. A model of soil slopes is constructed to predict the probability of slope failure and analyze the influence of the induced-factors on the results. The paper explains the theoretical background of enhanced Bayesian networks, able to cope with continuous input parameters, and Credal networks, specially used for incomplete input information. Two geotechnical examples are implemented to demonstrate the feasibility and predictive effectiveness of advanced Bayesian networks. The ability of BNs to deal with the prediction of slope failure is discussed as well. The paper also evaluates the influence of several geotechnical parameters. Besides, it discusses how the different types of BNs contribute for assessing the stability of real slopes, and how new information could be introduced and updated in the analysis.

scholarly journals ANALISIS STABILITAS LONGSORAN BERDASARKAN KONDISI TIPE, SIFAT FISIK DAN MEKANIK BATUAN DI KECAMATAN TELUKPANDAN KABUPATEN KUTAI TIMUR, PROVINSI KALIMANTAN TIMUR.

1970 ◽  
Vol 16 (1) ◽  
Author(s):  
Sujiman Sujiman
Keyword(s):  
Slope Stability ◽  
Rock Mechanics ◽  
Friction Angle ◽  
Research Area ◽  
Test Results ◽  
East Kalimantan ◽  
Overall Stability ◽  
Simulation Results ◽  
The Stability ◽  
Rock Lithology

The research title is Slope Stability Analysis Based On Type, Physical And MechanicalProperties Rock In Teluk Pandan District, East Kutai Regency, East Kalimantan Provinceaimed to determine the lithology in the    research area and to find out how the amount ofslope that will be a landslide at that location.How the research with the analysis of coring drilling results are then analyzed in thelaboratory of rock mechanics to get the caracteristic of physical and mechanical propertiesof the rocks. Methods of data analysis using Hoek and bray methode with Rockslide software.The results showed that in the area study has a sedimentary rock lithology fine tomedium dedritus, such as claystone, siltstone and sandstone, as well as inserts are coal andshale. Based on the results of laboratory analysis of rock mechanics obtained density between2,648 to 2,770. While the test results obtained value triaxal cohesion between (6.66 - 9:05)Kg / cm2, friction angle in between (37.19 - 44.08)o, cohesion residual (2.72 - 3.10) Kg / cm,residual friction angle (27.22 - 32.44). While the direct shear test the cohesion of thesummit between (6.66 - 9:05) Kg / cm2o, friction angle in the cohesion peak (36.15 - 43.00),cohesion residual (2:22 to 3:10) Kg / cm, friction angle in the cohesion residual (37.22 33.85)o2. The simulation results stability of the slope stability Hoek and Bray using rockslidesoftware, the result is that if the slope with a single slope stability, the stability of the slopeis 60o, and if the slope with the stability of the slope overall stability of the slope is 48o.

scholarly journals Slope Stability Analysis Based on Type, Physical And Mechanical Properties Rock in Teluk Pandan District, East Kutai Regency, East Kalimantan

2017 ◽  
Vol 2 (4) ◽  
pp. 272
Author(s):  
Sujiman Kusnadi
Keyword(s):  
Mechanical Properties ◽  
Slope Stability ◽  
Rock Mechanics ◽  
Physical And Mechanical Properties ◽  
Friction Angle ◽  
Research Area ◽  
Test Results ◽  
East Kalimantan ◽  
The Stability ◽  
Rock Lithology

Research was located In Teluk Pandan District, East Kutai Regency, East Kalimantan Province.  It’s aimed to determine the lithology in the  research area and to find out how the amount of slope that will be a landslide at that location. The research conducted with the analysis of coring drilling results and then analyzed in the laboratory of rock mechanics to get the characteristic of physical and mechanical properties of the rocks. The data analysis using Hoek and Bray Method. The results showed that in the area study has a sedimentary rock lithology fine to medium detritus, such as claystone, siltstone and sandstone, as well as inserts are coal and shale. Based on the results of laboratory analysis of rock mechanics obtained density between 2,648 to 2,770. While the test results obtained value triaxial cohesion between (6.66 - 9:05) Kg / cm2, friction angle in between (37.19 - 44.08)o, cohesion residual (2.72 - 3.10) Kg / cm2, residual friction angle (27.22 - 32.44)o. While the direct shear test the cohesion of the summit between (6.66 - 9:05) Kg / cm2, friction angle in the cohesion peak (36.15 - 43.00)o, cohesion residual (2:22 to 3:10) Kg / cm2, friction angle in the cohesion residual (37.22 - 33.85)o. The simulation results stability of the slope stability Hoek and Bray using rockslide software, the result is that if the slope with a single slope stability, the stability of the slope is 60o, and if the slope with the stability of the slope overall stability of the slope is 48o.

scholarly journals On the stability interpretation of Extended Column Test results

2020 ◽  
Author(s):  
Frank Techel ◽  
Kurt Winkler ◽  
Matthias Walcher ◽  
Alec van Herwijnen ◽  
Jürg Schweizer
Keyword(s):  
Slope Stability ◽  
Large Data ◽  
Stability Assessment ◽  
Test Results ◽  
Column Test ◽  
Secondary Importance ◽  
Data Set ◽  
Detailed Classification ◽  
Stable Conditions ◽  
The Stability

Abstract. Snow instability tests provide valuable information regarding the stability of the snowpack. Test results are key data used to prepare public avalanche forecasts. However, to include them into the operational procedures, a quantitative interpretation scheme is needed. Whereas the interpretation of the Rutschblock test is well established, a similar detailed classification for the Extended Column Test (ECT) is lacking. Therefore, we develop a 4-class stability interpretation scheme. Exploring a large data set of 1719 ECTs observed at 1226 sites, often performed together with a Rutschblock (RB) in the same snow pit, and corresponding slope stability information, we revisit the existing stability interpretations, explore the potential of a more detailed classification, and specifically consider the interpretation of cases when two ECTs were performed in the same snow pit. Our findings confirm previous research, namely that the crack propagation propensity is the most relevant result and that the loading step required to initiate a crack is of secondary importance for stability assessment. The comparison with the RB showed that the ECT classifies slope stability less reliably than the RB. In some situations, performing a second ECT may be helpful, when the first test did neither indicate rather unstable nor stable conditions. Finally, the data clearly show that false-unstable predictions of stability tests outnumber the correct-unstable predictions in an environment where overall unstable locations are rare.

The stability and collapse of lava domes: insight from UAS-derived 4D structure and slope stability models

2020 ◽  
Author(s):  
Brett Carr ◽  
Einat Lev ◽  
Loÿc Vanderkluysen ◽  
Danielle Moyer ◽  
Gayatri Marliyani ◽  
...  
Keyword(s):  
Slope Stability ◽  
Lava Domes ◽  
The Stability

ANALISIS KESTABILAN LERENG DINDING AKHIR DI PIT BARATLAUT PADA PENAMBANGAN BATUBARA DI PT. PUTERA BARA MITRA , KECAMATAN MENTEWE, KALIMANTAN SELATAN

KURVATEK ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 21-34
Author(s):  
Untung Wahyudi ◽  
Excelsior T P ◽  
Luthfi Wahyudi
Keyword(s):  
Slope Stability ◽  
Mining Operation ◽  
Subsurface Water ◽  
Mining System ◽  
Mine Site ◽  
Analysis And Design ◽  
The Stability ◽  
End Wall ◽  
Wall Slope ◽  
Mining Slope

PT. Putera Bara Mitra used open mining system for mining operation, Yet the completion of study on the end wall slope stability that  undertaken by geotechnical PT. Putera Bara Mitra in Northwest Pit and the occured a failure in the low wall on the 1st June 2012 led to the need for analysis and design the overall slope at the mine site. To analyze and design the overall slope, used value of the recommended minimum safety. The value was based on company for single slope SF ≥ 1.2 and SF ≥ 1.3 for overall slope. The calculation used Bichop method with the help of software slide v 5.0. Geometry improvements was done at the low slopes that originally single wall with a 30 m bench height and a slope 70° with SF = 0.781, into 4 levels with SF = 1.305. The analysis explained the factors that affect the stability of the low wall included the mining slope geometry, unfavorable drainase system, material stockpiles and seismicity factors. It was necessary to do prevention efforts to maintain the stability of the slope included the redesign to slope geometry, handling surface and subsurface water in a way to control slopes draining groundwater, vegetation stabilization using and monitoring slope using Total Station with Prism and Crackmeter to determine the movement of cracks visible on the surface. 

Slope Stability Analysis under the Condition of Seepage

2012 ◽  
Vol 204-208 ◽  
pp. 241-245
Author(s):  
Yang Jin
Keyword(s):  
Finite Element Method ◽  
Shear Strength ◽  
Slope Stability ◽  
Negative Impact ◽  
Strength Reduction ◽  
Soil Slope ◽  
Failure State ◽  
Calculation Results ◽  
The Stability ◽  
Shear Strength Reduction

The stability of soil slope under seepage is calculated and analyzed by using finite element method based on the technique of shear strength reduction. When the condition of seepage or not is considered respectively, the critical failure state of slopes and corresponding safety coefficients can be determined by the numerical analysis and calculation. Besides, through analyzing and comparing the calculation results, it shows that seepage has a negative impact on slope stability.

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