scholarly journals Perencanaan Perkuatan Lereng Menggunakan Geoframe di Jalan Raya Dampit-Lumajang

2022 ◽  
Vol 10 (1) ◽  
pp. 59-68
Author(s):  
Lafridha Alyazahari ◽  
Luthfi Amri Wicaksono ◽  
Dwi Nurtanto
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
Rainy Season ◽  
Factor Of Safety ◽  
Soil Mass ◽  
Soil Stability ◽  
Safe Condition ◽  
Manual Calculation

A Landslide is the movement of soil mass or rock constituents down the slope due to disturbance of soil stability. One of the factors that affect soil stability is the rainy season as happened in Sumberwuluh Village, Candipuro District, Lumajang Regency. The alternative used to stabilize the slope is by changing the slope geometry, then adding geoframe reinforcement. This study aims to determine the value of the factor of safety (SF) of unreinforced slopes, after changing the slope geometry, and after being given geoframe reinforcement. The method used in analyzing slope stability is the Ordinary/Fellenius method. The results of the calculation of slope stability without reinforcement using the Rocscience Slide software obtained a SF of 0.719, while the manual calculation obtained a SF of 0.7191. The two values ​​of the safety factor are less than 1.25, which means that landslides often occur. The results of the calculation of slope stability after changing the geometry of the slopes obtained a SF of 0.828 where the value is less than 1.25 which means that landslides often occur. The slopes that have been changed geometry are added with geoframe reinforcement. The results of the calculation of slope stability using geoframe reinforcement obtained a SF of 1.315 where the value is more than 1.25 which means that landslides are rare or slope in a safe condition.

scholarly journals Slope Stability of an Earth Dam during Drawdown Conditions (KHASA-CHAI Dam) as a Case Study

2018 ◽  
Vol 7 (4.37) ◽  
pp. 17
Author(s):  
Adnan Jayed Zedan ◽  
Mariwan Ridha Faris ◽  
Ahmed Amer Abdulsattar
Keyword(s):  
Slope Stability ◽  
Factor Of Safety ◽  
Slip Surface ◽  
Earth Dam ◽  
Downstream Face ◽  
Upstream Slope ◽  
Maximum Water Level ◽  
Water Drawdown ◽  
Action Taking ◽  
Safe Condition

Aiming in this research was to have a clear view about the behavior of Khasa-Chai Dam during the draw down action taking into consideration the newly built of this dam which was filling during the time of this article, the upstream slope was investigated by taking drawdown of the water from the reservoir. This dam is consists of the zoned embankment with a total length of (2.36 km) with an upstream slope (1v:3h) and downstream slope (1v:2h). Slope stability was investigated during the drawdown of the water from the reservoir by considering the water in the reservoir to be at maximum water level and by taking two cases during the rapid and slow drawdown. SLOPE/W which is a sub program from Geo-Slope software was used in association with SEEP/W software to find the factor of safety of the upstream slip surface during the drawdown conditions. It was noticed from the drawdown conditions that the phreatic line falls almost at the same position for both cases. Also for both cases the factor of safety of the upstream slip surface falls above the value of (1.0) and that is mean the upstream slope is in a safe condition when the water drawdown. The exit gradient and the rate of flow at the downstream face decrease with time as the water in the reservoir drawdown which means the factor of safety against boiling increases with time.  

scholarly journals ANALISIS KESTABILAN LERENG DENGAN SOFTWARE ROCSCIENCE SLIDE

2018 ◽  
Author(s):  
Darmadi Ir
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Case Studies ◽  
Safety Factor ◽  
Factor Of Safety ◽  
Slope Angle ◽  
Maximum Load ◽  
Slope Stability Analysis

Abstract Slope stability analysis with SOFTWARE ROCSCIENCE SLIDE case studies in residential barracks of PT. Freport with various variations in loading and conditions show results The greater the load on the slope, the lower the Factor of Safety value. FS values for all methods, sections, and ramp widths are greater in dry than wet conditions. The greater the load distance from the slope, the greater the FS value. At a distance of 3m from the crest slope the decrease in FS value is very significant, in sections 1 and 2 there is still a secure FS value with a load of 50 kN / m, the smaller the overall slope angle (slope) the greater the FS value.Keywords: Slope stability, safety factor, maximum load

Slope Stability Analyses of Zoned Dam Under Steady State Condition/Case Study

2021 ◽  
Author(s):  
Ako Daraei ◽  
◽  
Dlshad Ahmed ◽  
Keyword(s):  
Steady State ◽  
Slope Stability ◽  
Safety Factor ◽  
Equilibrium Condition ◽  
Factor Of Safety ◽  
Slope Instability ◽  
Static Equilibrium ◽  
State Condition ◽  
Army Corps ◽  
Steady State Condition

Earth and rock are the principal materials from which dams are constructed, these kinds of dams are called embankment dams. The conventional limit equilibrium method has dominated use over any other method for analyzing slope stability. In this paper, Spence, Morgenstern-price, the Ordinary method of slices, and Janbu simplified methods are used in order to find out how near, far Aquban dam from the verge failure which is located in Erbil-Kurdistan/Iraq. In present study, the focus is mainly drawn on analyses of steady-state condition. To compute the factor of safety, the study utilized SLOPE/W software. The results show that there is no major difference in a safety factor and a critical slip surface position between all the methods which are used in the study. In addition, all used methods offered a more than the minimum required safety factory which is given by the U.S. Army Corps of Engineers so this ensures that the dam against slope instability is on the safe side. According to the results obtained from this study, Janbu simplified method which considers only force equilibrium condition produced the lowest factor of safety, while the highest and almost identical factor of safety generated from the methods that satisfy all the static equilibrium condition (Spencer and Morgenstern-Price methods) give. Therefore, a reasonably reliable and higher value of safety factor is given by the methods which satisfy all static equilibrium conditions.

scholarly journals PERENCANAAN LERENG SUNGAI SUGUTAMU PADA LOKASI PROYEK PESONA SQUARE DEPOK

2018 ◽  
Vol 17 (1) ◽  
Author(s):  
Putera Agung Maha Agung ◽  
Ramadhanty Saputri ◽  
Umar Alfaruqi Abdurrahman
Keyword(s):  
Slope Stability ◽  
River Water ◽  
Safety Factor ◽  
Water Surface ◽  
Surface Phase ◽  
The Road ◽  
Phase Slope ◽  
The People ◽  
Manual Calculation ◽  
Program Version

ABSTRACTThe location of inspection and vehicle road at Pesona Square Depok Project is on the side of Sugutamu River and contoured land giving a worried about sliding and erosion. This research was conducted for design the Slope of Sugutamu River At Pesona Square Depok Project which is effective, efficient, and gives comfort to the people there in using the road. Slope stability planning divided into 4 phase of calculation. Slope without outside load and not affected by river water surface phase, slope without outside load but affected by river water surface phase, slope with outside load but not affected by river water surface phase, and slope with outside load and affected by river water surface phase. The analysis uses two methods, manual analysis Fellenius methods and computer analysis PLAXIS program version 8.2. The shape and angle of the slope selected in this design is 60° and no-staging.. The value of minimum safety number from manual calculation of Fellenius method is 1,287 and PLAXIS program version 8.2 is 3,718. The value of the safety factor used is 1.25.Keywords: slope stability, safety factor, Fellenius method, PLAXIS version 8.2ABSTRAKLetak jalan inspeksi dan kendaraan pada Proyek Pesona Square Depok yang bersebelahan dengan Sungai Sugutamu dan bentuk tanah yang berkontur menimbulkan kekhawatiran akan terjadinya sliding dan erosi. Penelitian ini dilakukan untuk merencanakan lereng Sungai Sugutamu Pada Lokasi Proyek Pesona Square Depok yang efektif dan efisien serta memberikan kenyamanan kepada warga setempat dalam menggunakan jalan tersebut. Perencanaan stabilitas lereng dilakukan dalam empat fase perhitungan. Fase lereng dalam keadaan tanpa beban luar dan muka air sungai, fase lereng tanpa beban luar namun dipengaruhi muka air sungai, fase lereng dibebani beban luar namun tidak dipengaruhi muka air sungai, serta fase lereng dibebani beban luar dan dipengaruhi muka air sungai. Analisis menggunakan dua metode yaitu analisis manual metode Fellenius dan analisis komputer dengan program PLAXIS versi 8.2. Bentuk dan sudut kemiringan lereng yang dipilih dalam perencanaan ini yaitu sebesar 60˚dan tanpa undak (no-staging). Nilai angka keamanan terkecil yg didapat dari perhitungan manual metode Fellenius yaitu 1,287 dan program PLAXIS versi 8.2 sebesar 3,718. Nilai minimum faktor keamanan yang digunakan sebesar 1,25.Kata kunci : stabilitas lereng, faktor keamanan, metode Fellenius, PLAXIS versi 8.2

scholarly journals Comparison of factor of safety using different method of analysis for slope stability

2021 ◽  
Vol 1 (1) ◽  
pp. 52-58
Author(s):  
Norfarah Nadia Ismail ◽  
Ahmad Bukhari Ramli ◽  
Siti Noorliyana Mohd Pami
Keyword(s):  
Slope Stability ◽  
Shear Force ◽  
Factor Of Safety ◽  
Simplified Method ◽  
Critical Slope ◽  
The Stability ◽  
The Relationship ◽  
Manual Calculation ◽  
Ideal Method ◽  
The Ideal

Currently, the construction of slope is increasing, thus, the risk of slope to fail also increase. The series of landslide happen to the man-made slope has been recorded since in the early of 1993 until now. Many efforts such as treating the critical slope, redesigned the failed slope, and analyze the stability of the slope have been done. However, the landslide is still happening in Malaysia. The factor of safety (FOS) from the stability analysis that has been used might not be adequate to determine the safety of the slope in Malaysia. Therefore, in this study, the optimum factor of safety is obtained by using three methods of slice, Bishop’s Simplified method, Spencer method, and Morgenstern-Price method which have been used in many projects. A study place is selected in Ladang Balau, Semenyih, in Selangor and from the CIU test, the important soil parameter for slope is extracted for analysis of slope stability using SLOPE/W and manual calculation. The lambda for Spencer method and Morgenstern-Price method was generated for further discussion on the relationship between lambda and factor of safety. The data generated from both calculation method, from manual and software, were discussed and next the ideal method to achieve the optimum factor of safety determined. The factor of safety for every method basically are influenced by the interslice shear force presence but not Bishop’s Simplified method as moment equilibrium is insensitive towards interslice force function. For lambda, the factor that influenced the value is the function used; constant and half-sine function, however, for Bishop’s Simplified method, the lambda is equal to zero as the method ignored the interslice shear force. The Morgenstern-Price method has been chosen to be the best method to generate a good factor of safety.

scholarly journals Analisis Efektivitas Model Perkuatan dengan Injeksi Semen untuk Peningkatan Angka Keamanan Lereng

2017 ◽  
Vol 23 (1) ◽  
pp. 23
Author(s):  
Sumirin Sumirin ◽  
Rifqi Brilyanto Arief
Keyword(s):  
Slope Stability ◽  
Cement Paste ◽  
Safety Factor ◽  
Factor Of Safety ◽  
Coarse Aggregate ◽  
Field Testing ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Drilling Technique ◽  
Mixed Samples

The problem of slope stability can be overcome by grouting of cement paste. But, the question often arises as to the extent of grouting of cement paste can increase the factor of safety. This study aims to determine the effectiveness of the effect of grouting on increasing safety factor on the slope of embankment. Experiments have been conducted in the laboratory using 6 types of mixed samples of sand and coarse aggregate. Field testing was conducted on 1 model to determine the effectiveness of grouting. The results of the experiments show that the injection of cement paste in this study proved to be effective in strengthening the embankment with the content of coarse aggregate 60%. The increase factor of safety (FS) using grouting is from FS= 1.9 (33.3%) to FS = 2.80 (90.0%). Factors determining the effectiveness of injection are: (a) injection method with drilling technique before injection to form cement column; (b) the optimum of water-cement ratio w/c = 1.5; (c) the ratio of spacing and injection diameter Lg / Dg = 8, the depth of injection 0.75 from the height of the embankment.

scholarly journals Assessment of slope stability at landslide area in B’LaoWard, Bao Loc city, Lam Dong province and solutions to prevent landslide

2016 ◽  
Vol 19 (1) ◽  
pp. 76-85 ◽  
Author(s):  
Vinh Trong Bui ◽  
Ha Sanh Nguyen ◽  
Thong Huynh Nguyen
Keyword(s):  
Slope Stability ◽  
Rainy Season ◽  
Factor Of Safety ◽  
Present Model ◽  
Mountainous Terrain ◽  
Landslide Area ◽  
Soil Extraction ◽  
Two Cities ◽  
The Relationship ◽  
Moisture Increase

Bao Loc is one of two cities of Lam Dong province. Located on Di Linh – Bao Loc plateau about 800 – 1000m elevation, Bao Lọc has the complex mountainous terrain. The authors have surveyed and collected information and samples in the landslide area. This area occurred the cracks, damaged several buildings within 1.2 ha. The authors have also identified causes of landslide such as geomorphotogy, stratigraphic slope, slope materials, hydrogeology, climate, etc. However, the main cause was soil extraction activities at toe of slope which lost the counterweight berm, associated with the moisture increase of soil due to heavy rainfall in rainy season. It reduced the shear strength of slope materials. Based on data analysis of surveyed location, the authors applied GeoStudio software by SLOPE/W module so as to calculate the slope stability under the sections. Analyzed results showed that the slope was stable in dry season with the minimum factor of safety (FS) around 1.474, in rainy season the slope was unstable with minimum the factor of safety around 0.896 commensurate with groundwater present model. The minimum factors of safety in the model with the appearance of groundwater table are represented by the distance among the slope sections following the relationship function with correlation coefficient (R2) is 0.9915. According to the interpolated result from the relationship function showed that the width of unstable area or the width of sliding mass is 35.1m. As the obtained results, the authors proposed realizable solutions to stabilize the slope in order to minimize the effect of landslide at the study area.

Generalized Limit Equilibrium Method for Slope Stability Analysis

2012 ◽  
Vol 170-173 ◽  
pp. 557-568 ◽  
Author(s):  
Chuan Zhi Huang ◽  
Yong Hua Cao ◽  
Wan He Sun
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
Limit Analysis ◽  
Limit Equilibrium ◽  
Soil Mass ◽  
Limit Equilibrium Method ◽  
Sliding Surface ◽  
Analysis Method ◽  
Equilibrium Method ◽  
Genuine Solution

On the basis of the limit equilibrium method and the physical significance of Coulomb’s yield criteria, extremum conditions of yield functions is established, which will be the fundamental equations for the limit analysis of soil mass. Once the stress equation along a sliding surface is available, the normal stress on the sliding surface can be obtained, a new limit analysis method, generalized limit equilibrium method (GLEM), can be established. With the generalized limit equilibrium method, an analysis method to solve the problem of slope stability can be obtained without introducing any other assumptions or simplified conditions but the sliding surface. With this algorithm, any discretionally possible sliding surface can be trial calculated and the least value of the calculated results of different sliding surfaces is taken as the safety factor. As long as a selected sliding surface is close to the true sliding surface, the derived safety factor will be approximate to the genuine solution to a problem of slope stability.

Slope Stability Analysis of Elastic Limit Equilibrium Method

2013 ◽  
Vol 275-277 ◽  
pp. 1423-1426
Author(s):  
Lin Kuang ◽  
Ai Zhong Lv ◽  
Yu Zhou
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Safety Factor ◽  
Slip Surface ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Slope Stability Analysis ◽  
Sliding Surface ◽  
Tangential Stresses ◽  
Equilibrium Method

Based on finite element analysis software ANSYS, slope stability analysis is carried out by Elastic limiting equilibrium method proposed in this paper. A series of sliding surface of the slope can be assumed firstly, and then stress field along the sliding surface is analyzed as the slope is in elastic state. The normal and tangential stresses along each sliding surface can be obtained, respectively. Then the safety factor for each slip surface can be calculated, the slip surface which the safety factor is smallest is the most dangerous sliding surface. This method is different from the previous limit equilibrium method. For the previous limit equilibrium method, the normal and tangential stresses along the sliding surface are calculated based on many assumptions. While, the limit equilibrium method proposed in this paper has fewer assumptions and clear physical meaning.

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