• Title/Summary/Keyword: slope analysis

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Analysis of factors affecting vegetation cover for stabilization of granite weathered soil forest road cut slopes

  • Seong-Man Kim;Sung-Min Choi;Ye Jun Choe;Yun-Jin Shim;Joon-Woo Lee
    • Korean Journal of Agricultural Science
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    • v.49 no.4
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    • pp.861-871
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    • 2022
  • This study was conducted to improve the stability of cut slopes of forest roads in granitic weathered soil areas. The study area is a national forest road (road length 28.48 km) in Pyeongchang-gun, Gangwon-do. After data collection, a statistical analysis was performed using IBM SPSS (Ver. 26.0). First, the correlation analysis showed that structure, slope position, soil erosion, slope, and aspect (N, S) were correlated with vegetation coverage (p < 0.05). Elapsed years, slope distance, and aspect (E, W) were found to have no correlation with vegetation coverage. (p > 0.05) Second, one-way ANOVA and Kruskal-Wallis test results showed that vegetation coverage was worse when the slope was located at the top or the middle of the slope than at the bottom of the slope. In addition, the site with sheathing and gabions showed good vegetation coverage when compared with the site without structures. In the case of soil erosion, areas with severe damage and moderate damage showed worse vegetation coverage. Therefore, it is necessary to strengthen the slope angle of the cut soil of the granitic weathered soil area from 1 : 0.5 - 1.2 to 1 : 0.8 - 1.5. In addition, structures such as sheathing and gabions should be installed on granitic weathered land.

Analysis of collapse course of mudstone cut slope and suggest countermeasure (이암 절토 사면의 붕괴 요인 분석 및 대책방안 제시)

  • Park, Min-Cheol
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.4
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    • pp.123-131
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    • 2018
  • This study analyzed the collapse course of a mud stone cut slope during the construction of a express and suggested a countermeasure. Experiments were carried out on bedrock mudstone to investigate the engineering characteristics and the slope stability analysis at the time the design was reviewed. In addition, stability analysis, considering the strength softening characteristics of the slope due to the Swelling-Slaking phenomenon, was also performed. As a result of the Swelling-Slaking test, the slake durability was Low-Medium, and the swell potential was Very Low. A review of the stability analysis performed at the time of the design showed different results from the actual results because LEM analysis had been performed without considering the engineering characteristics of mudstone. As a result of additional stability analysis considering the strength softening characteristics, the slope collapse point and the maximum shear strain point of the stability analysis were the same and the standard safety factor was not satisfied. As a countermeasure, a slope mitigation method was found to be most appropriate. The mitigation slope was calculated by Finite element Analysis. A comparison with BIPS to determine the applicability of a mitigation slope revealed most of the unconsolidated mudstone.

Compare Seismic Coefficient Method and Seismic Response Analysis for Slope during Earthquake (지진시 사면안정해석에 있어서의 진도법과 지진응답해석의 결과 비교)

  • 박성진;오병현;박춘식;황성춘
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.11a
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    • pp.193-200
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    • 2000
  • Numerical analysis of slope stability is presented using slice method, static seismic analysis methods, and earthquake response analysis methods. Static seismic force is considered as 0.2g while vertical static seismic force is not considered in analysis. For earthquake response analysis, Hachinohe-wave is applied. Safety factor calculated using slice method for failure surface. Calculating methods are Bishop's method and Janhu's method. Static seismic analysis was applied using Mhor-Coulomb model and earthquake response analysis was applied using non-linear elastic model.

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Research on the Production of Risk Maps on Cut Slope Using Weather Information and Adaboost Model (기상정보와 Adaboost 모델을 이용한 깎기비탈면 위험도 지도 개발 연구)

  • Woo, Yonghoon;Kim, Seung-Hyun;Kim, Jin uk;Park, GwangHae
    • The Journal of Engineering Geology
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    • v.30 no.4
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    • pp.663-671
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    • 2020
  • Recently, there have been many natural disasters in Korea, not only in forest areas but also in urban areas, and the national requirements for them are increasing. In particular, there is no pre-disaster information system that can systematically manage the collapse of the slope of the national highway. In this study, big data analysis was conducted on the factors causing slope collapse based on the detailed investigation report on the slope collapse of national roads in Gangwon-do and Gyeongsang-do areas managed by the Cut Slope Management System (CSMS) and the basic survey of slope failures. Based on the analysis results, a slope collapse risk prediction model was established through Adaboost, a classification-based machine learning model, reflecting the collapse slope location and weather information. It also developed a visualization map for the risk of slope collapse, which is a visualization program, to show that it can be used for preemptive disaster prevention measures by identifying the risk of slope due to changes in weather conditions.

A Study on the Factor of Safety for Rock Slopes Based on Three Dimensional Effects (3차원 효과를 고려한 암반사면의 안전율 변화에 관한 연구)

  • Seo, Og-Geon;Lee, Seung-Ho
    • Journal of the Korean Geotechnical Society
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    • v.31 no.1
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    • pp.47-52
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    • 2015
  • In the slope stability analysis and design, Limit Equilibrium Method (LEM) and Shear Strength Reduction technique (SSR) are mainly used. Both methods are able to perform two and three dimensional analysis. SSR is considered to be more sensitive and more reasonable than LEM by many researchers. However, in practice LEM is still widely used because of the increase of analysis time and complexity of the model in SSR. In this study, three dimensional analysis of the protruding rock slope is performed by SSR in order to study the effects of protruding length using rock slope FLAC 3D. In this study, as results of analysis variations of the safety factor have been studied according to slope angle, slope height, the soil strength, protruding slope length projected variables. The results show that the factor of safety as more affected by the shapes of the protruding rock slope than the rock strength.

Prediction of Slope Failure Arc Using Multilayer Perceptron (다층 퍼셉트론 신경망을 이용한 사면원호 파괴 예측)

  • Ma, Jeehoon;Yun, Tae Sup
    • Journal of the Korean Geotechnical Society
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    • v.38 no.8
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    • pp.39-52
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    • 2022
  • Multilayer perceptron neural network was trained to determine the factor of safety and slip surface of the slope. Slope geometry is a simple slope based on Korean design standards, and the case of dry and existing groundwater levels are both considered, and the properties of the soil composing the slope are considered to be sandy soil including fine particles. When curating the data required for model training, slope stability analysis was performed in 42,000 cases using the limit equilibrium method. Steady-state seepage analysis of groundwater was also performed, and the results generated were applied to slope stability analysis. Results show that the multilayer perceptron model can predict the factor of safety and failure arc with high performance when the slope's physical properties data are input. A method for quantitative validation of the model performance is presented.

Comparative Study of Square-Inventory Method with Scanline Survey in Slope Stability Analysis (사면 안정 분석을 위한 정면적법과 선조사법의 비교연구)

  • Cheong, Sang-Won;Choi, Byoung-Ryol
    • The Journal of Engineering Geology
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    • v.19 no.2
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    • pp.119-129
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    • 2009
  • In relation to slope stability analysis, geologic characteristics and engineering properties of the discontinuities in three slopes selected are compared and analyzed by both square-inventory method and scanline survey. The aim of the study is in evaluating which method is applied better in slope stability analysis by comparing results of the two methods with those of direct observation on outcrop of slope failures generated. In each slope, results of comparative analysis among geologic and engineering properties are analyzed similarly one another. However, results of orientation analysis in slope 2 are different each other, which indicates orientation of joints in slope 2 depends on persistency and frequency of each joint and also indicates appearance of new joint set with different orientation. Probability density distribution and spacing in slope 3 are high in comparison to those in slope 2 and 3. The reasons are that distribution of psammitic rocks and development of minor folds in slope 3 unlike slope 2 and 3 are closely associated with development of joints. The research data indicate that the square-inventory method predicts more precise failure aspects and is more effective way than scanline survey in analyzing slope stability of the study area.

Analysis of Slope Stability of Masonry Retaining Walls in Quarry (석산개발 지역 퇴적장 석축사면의 안정성 해석)

  • Ma, Ho-Seop;Lee, Sung-Jae
    • Journal of Korean Society of Forest Science
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    • v.107 no.4
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    • pp.385-392
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    • 2018
  • The slope stabilization analysis was performed by conducting survey and selecting the representative section in order to improve slope composition and management technology of masonry embankments in the quarry area, The mean slope of the masonry retain wall (A, B, C, D, E, F) was $38.5^{\circ}$, although the steep slope of the lowest slope (A) as $59^{\circ}$. The horizontal distance of the masonry embankments is 66.2 m and the slope height is 48.3 m. However, the inclination of the masonry embankments is relatively steep and visually unstable. The slope stability analysis for the slope stability analysis was taken into account during the drying and saturation. The slope stability analysis during saturation was performed by modeling the fully saturated slope. The strength constants of the ground were divided into two groups. The safety factor for dry period was 1.850 and the safety factor for rainy season was 1.333. The safety rate of dry period and rainy season was above 1.5 and 1.2. However, the weathered granite on the upper part of the masonry embankments at the time of heavy rainfall is considered to have a high risk of slope erosion and collapse. Therefore, it is considered necessary to take measures for stabilization through appropriate maintenance such as drainage installation.

Study of Stability Analysis and Countermeasure Tunnel Portal Failure using Dipole-Dipole Investigation (쌍극자(Dipole-Dipole)탐사를 활용한 터널붕괴사면 조사 및 대책방안 제시 연구)

  • Baek, Yong;Rhee, Jong-Hyun;Koo, Ho-Bon;Bae, Gyu-Jin
    • Proceedings of the Korean Geotechical Society Conference
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    • 2003.03a
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    • pp.493-498
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    • 2003
  • In case of slope failure by planted protection is constructed on the slope according to of the choice trend of a recently environmental-friendly countermeasure, there has a limitation about diagnosis and preparation of measure. Also, collapse of tunnel pithead department slope has maximum in construction and countermeasure method of construction choice unlike cut-slope. In this study, analyzed inside circumstance of slope using geophysical exploration for stability analysis and countermeasure inside presentation of tunnel pithead department slope which collapse happens. geophysical exploration used dipole(Dipole-Dipole) method that is based to distribution principle does specific resistance, goes side by side with on-the-spot observation and draws base strength parameter and executed stability analysis, and presented stabilization countermeasure inside of collapse slope on this. I wish to conduce in development and research for use technical development of geophysical exploration technique hereafter by executing geophysical exploration in road collapse spot applying through this study.

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Displacement Measuring System for the Slope Stability Analysis Using the Softcopy Photogrammetry (사면안정해석을 위한 사진측량을 이용한 사면변위계측시스템)

  • 한중근;송영석
    • Journal of the Korean Geotechnical Society
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    • v.19 no.4
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    • pp.23-32
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    • 2003
  • The displacement measuring systems of slope ground surface are very expensive instruments and have disadvantages concerning installing, maintaining and surveying. The measuring works are very dangerous. Recently, simple systems are required to measure the displacement of slope ground surface in stages of cutting and maintaining slope. In this study, the mechanism of Softcopy Photogrammetry is applied to measure the displacement of slope ground surface. Three dimensional data of the slope ground surface can effectively be obtained in order to analyze slope stability. Computer Program, DIMA (Design IMmage Analysis), including the reformation process of a contour line was developed. As a result of this study, countermeasure and instruction standards of the displacement of slope ground surface before and after slope failure are established. Also, disadvantages of the existing system can be complemented.