scholarly journals Brief Literature Review and Classification System of Reliability Methods for Evaluating the Stability of Earth Slopes

2021 ◽  
Vol 13 (16) ◽  
pp. 9090
Author(s):  
Jarosław Przewłócki
Keyword(s):  
Literature Review ◽  
Slope Stability ◽  
Classification System ◽  
Probabilistic Methods ◽  
Historical Background ◽  
Soil Parameters ◽  
Earth Slope ◽  
Earth Slopes ◽  
Reliability Methods ◽  
The Stability

The issue of slope stability is one of the most important and yet most difficult geotechnical problems. Assessing slope stability is particularly difficult because of the many uncertainties involved in the process. To take these uncertainties into account, probabilistic methods are used, and the reliability approach is adopted. There are many methods for reliability assessment of earth slope stability. However, there is no system that would organize all of these methods in an unambiguous way. In fact, these methods can be classified in different ways: by assignment to a deterministic classification of methods, by description of uncertainties of soil parameters, by level of reliability according to the theory of reliability, etc. The huge number of articles summarizing the research in this field, but in various “disordered” directions, certainly do not facilitate the understanding or ultimately the practical application of the reliability approach by the engineer. The paper proposes a universal classification system of reliability methods for evaluating the stability of earth slopes. This proposal is preceded by a brief literature review of both historical background and contemporary research on reliability analysis of earth slope stability.

scholarly journals Study on the Stability of the Geogrids-Reinforced Earth Slope under the Coupling Effect of Rainfall and Earthquake

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Xijun Zhang ◽  
Liang Huang ◽  
Yujie Hou ◽  
Bo Wang ◽  
Binghan Xue ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Coupling Effect ◽  
Calculation Model ◽  
Influential Factor ◽  
Construction Design ◽  
Reinforced Earth ◽  
Overall Stability ◽  
Earth Slope ◽  
Earth Slopes ◽  
The Stability

This paper focuses on understanding the dynamic response problem of flexible wrapped reinforced Earth slope under the coupling effect of earthquake and rainfall; a numerical calculation model of reinforced Earth slope considering the coupling effect of earthquake and rainfall was established. The dynamic response, pore pressure, and tensile stress distribution of the reinforcement under the rainfall before earthquake, the rainfall after the earthquake, and earthquake-rainfall are studied. The results show that the coupling effect of earthquake and rainfall is an influential factor in the dynamic analysis of reinforced Earth slopes, the analysis of which should be paid attention to and researched in the future. The combination of geogrid and soil effectively improves the deformation of the slope and the overall stability, reduces the secondary disaster of the slope, and provides a reference for the seismic construction design of the reinforced Earth slope.

scholarly journals Influence of parameters of retaining walls and loose soils on the stability of slopes in the new construction of residential complexes

2020 ◽  
pp. 65-75
Author(s):  
Liudmyla Skochko ◽  
Viktor Nosenko ◽  
Vasyl Pidlutskyi ◽  
Oleksandr Gavryliuk
Keyword(s):  
Finite Element ◽  
Slope Stability ◽  
Cross Sections ◽  
Retaining Wall ◽  
Retaining Walls ◽  
Natural State ◽  
Soil Parameters ◽  
Stability Of Slopes ◽  
The Stability ◽  
Stage 1

The stability of the slope in the existing and design provisions is investigated, the constructive decisions of retaining walls on protection of the territory of construction of a residential complex in a zone of a slope are substantiated. The stability of the slope when using rational landslide structures is estimated. The results of the calculation of the slope stability for five characteristic sections on the basis of engineering-geological survey are analyzed. For each of the given sections the finite-element scheme according to the last data on change of a relief is created. The slope was formed artificially by filling the existing ravine with construction debris from the demolition of old houses and from the excavation of ditches for the first houses of the complex. Five sections along the slope are considered and its stability in the natural state and design positions is determined. Also the constructive decisions of retaining walls on protection of the territory of construction of a residential complex as along the slope there are bulk soils with various difference of heights are substantiated. This requires a separate approach to the choice of parameters of retaining walls, namely the dimensions of the piles and their mutual placement, as well as the choice of the angle of the bulk soil along the slope. The calculations were performed using numerical simulation of the stress-strain state of the system "slope soils-retaining wall" using the finite element method. An elastic-plastic model of soil deformation with a change in soil parameters (deformation module) depending on the level of stresses in the soil is adopted. Hardening soil model (HSM) used. Calculations of slope stability involve taking into account the technological sequence of erection of retaining walls and modeling of the phased development of the pit. The simulation was performed in several stages: Stage 1 - determination of stresses from the own shaft, Stage 2 - assessment of slope stability before construction, Stage 3 - installation of retaining wall piles, Stage 4 - assessment of slope stability after landslides. Based on these studies, practical recommendations were developed for the design of each section of the retaining wall in accordance with the characteristic cross-sections.

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 Systematic slope stability assessment through deformation field monitoring

2019 ◽  
Vol 92 ◽  
pp. 18009
Author(s):  
Yukun Wei ◽  
Anders B. Lundberg ◽  
Fredrik Resare
Keyword(s):  
Slope Stability ◽  
Measurement Data ◽  
Back Analysis ◽  
Field Measurements ◽  
Field Monitoring ◽  
Monitoring Data ◽  
Soil Parameters ◽  
Stability Assessment ◽  
Stability Of Slopes ◽  
The Stability

Field monitoring is frequently carried out during excavations and other geotechnical activities and provides additional information during the execution of a construction project. The interpretation of field monitoring data is often obscured by measurement noise and disturbance, and a systematic approach to assess both the quality and implications of the field monitoring data is very helpful in geotechnical practice. The possibility to infer practical conclusions from the field monitoring data depends on the type of field measurements, especially in monitoring of the stability of slopes. Pore pressure measurements can serve as a direct measurement of utilized soil strength for a slope, while deformation measurements are significantly more ambiguous and complicates the interpretation. The assessment of slope stability through field monitoring of deformations requires inverse or back analysis of the soil properties, followed by a forward analysis of the resulting slope stability. Such an inverse or back analysis is frequently influenced by non-uniqueness of the material properties and the stability of the measurement data. Systematic approaches to inverse or back analysis have been demonstrated in the scientific literature, but the practical use of these methods is not entirely straight-forward. The current paper presents a case study of systematic slope stability assessment through field measurements of deformations with a review of the field monitoring programme, numerical simulations of deformations, and a simplified approach to back analysis of the soil parameters. The excavation of a slope in an urban environment including layers of organic clay covered with highly heterogeneous gravel fill is used as an example of geotechnical back analysis. The aim is to elucidate some of the challenges in geotechnical back analysis while providing some practical solutions for practice.

scholarly journals Prediksi Daerah Rawan Longsor Pada Kawasan Pengembangan Jalan Nasional Pulau Sanana di Maluku Utara

2018 ◽  
Vol 14 (1) ◽  
pp. 47-54
Author(s):  
Pieter Kunu ◽  
Marcus Luhukay
Keyword(s):  
Slope Stability ◽  
Plant Conservation ◽  
Survey Method ◽  
Soil Parameters ◽  
The Road ◽  
Mountainous Regions ◽  
Cutting Slope ◽  
Stability Of Slopes ◽  
The Stability ◽  
National Road

Research has been conducted with the aim of mapping a potential landslide of soil that is alleged to be happening on a national road development area on the island of North Maluku Sanana island because in some locations excavations or cutting slope were conducted for build trails. Research was done by survey method, by analysis of land as well as the analysis of soil samples in the laboratory against some physical-chemical soil parameters to predict the potential for landslide of soil. The results showed that in the developed area of national roads, there were some points or locations with the potential landslide. However, by cutting slope of landslide the potential became greater, things which would be very threatening road users on the sections of the road that passes through the hilly and mountainous regions. The cutting slopes have been disturbing the equilibrium slope stability or lower slopes so the landslide is easy to happen. Mitigation efforts can be done by building a retaining structure at the foot of the slopes, the angle of the cutting slope made slightly sloping and in the upper part land use should be preserved and enriched with plant conservation to improve the stability of slopes. Keywords: a potential avalanche of soil, national road, slope stability   ABSTRAK Penelitian telah dilakukan dengan tujuan untuk memetakan potensi longsoran tanah yang diduga akan terjadi pada kawasan pengembangan jalan nasional di Pulau Sanana Maluku Utara karena di beberapa lokasi dilakukan penggalian atau pemotongan lereng untuk membangun jalur jalan. Penelitian dilakukan dengan metode survey dengan analisis lahan serta analisis sampel tanah di laboratorium terhadap beberapa parameter fisik-kimia tanah untuk memprediksi potensi longsoran tanah. Hasil penelitian menunjukkan bahwa pada kawasan ruas jalan nasional yang dikembangkan terdapat beberapa titik atau lokasi dengan potensi longsoran tergolong sedang. Namun dengan adanya pemotongan lereng maka potensi longsoran menjadi semakin besar, hal mana akan sangat mengancam pengguna jalan di ruas-ruas jalan yang melewati kawasan berbukit dan bergunung. Pemotongan lereng telah mengganggu keseimbangan lereng atau menurunkan stabilitas lereng sehingga longsoran mudah terjadi. Upaya mitigasi dapat dilakukan dengan membangun struktur penahan di kaki lereng, sudut pemotongan lereng dibuat landai dan penggunaan lahan di bagian atas lereng harus dipertahankan dan diperkayadengan tanaman konservasi untuk meningkatkan stabilitas lereng yang sudah terganggu. Kata kunci: jalan nasional, potensi longsoran tanah, stabilitas lereng

Analysis Methods for Probabilistic Life Assessment

2021 ◽  
pp. 77-97
Author(s):  
Robert Kurth ◽  
Cédric Sallaberry
Keyword(s):  
Uncertainty Propagation ◽  
Essential Element ◽  
Latin Hypercube Sampling ◽  
Random Variable ◽  
Monte Carlo Sampling ◽  
Probabilistic Methods ◽  
Life Assessment ◽  
Historical Background ◽  
Reliability Methods

Abstract This article provides an outline of the issues to consider in performing a probabilistic life assessment. It begins with an historical background and introduces the most common methods. The article then describes those methods covering subjects such as the required random variable definitions, how uncertainty is quantified, and input for the associated random variables, as well as the characterization of the response uncertainty. Next, it focuses on specific and generic uncertainty propagation techniques: first- and second-order reliability methods, the response surface method, and the most frequently used simulation methods, standard Monte Carlo sampling, Latin hypercube sampling, and discrete probability distribution sampling. Further, the article discusses methods developed to analyze the results of probabilistic methods and covers the use of epistemic and aleatory sampling as well as several statistical techniques. Finally, it illustrates some of the techniques with application problems for which probabilistic analysis is an essential element.

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. 

Current literature review on methods for measuring the stability of osseointegrable implants.

2020 ◽  
Vol 2 (4) ◽  
pp. 64-78
Author(s):  
Noha El-Wassefy ◽  
Lars Sennerby ◽  
Dhoom SIngh Mehta ◽  
Thiago De Santana Santos
Keyword(s):  
Literature Review ◽  
Current Literature ◽  
Implant Survival ◽  
Implant Stability ◽  
Implant Placement ◽  
Factors Influencing ◽  
Case Documentation ◽  
Bone To Implant Contact ◽  
The Stability

“Osseointegration” as formulated by Alberktson is crucial for implant survival and success. Osseointegration is a measure of implant stability. Measuring implant stability helps to arrive at decisions as to loading of an implant, allows choice of protocol on a patient to patient basis and provides better case documentation. A successful implant reflects good bone to implant contact and is determined by implant stability both primary and secondary. Implant stability is achieved at two different stages – primary (immediately after implant placement) and secondary (3-4 months after implant placement). Implant stability has been confirmed to affect the process of osseointegration and therefore is essential to understand the methods to measure implant stability and factors influencing. Various methods are developed to assess implant stability which suggests the prognosis of an implant.

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