scholarly journals Analisis Stabilitas Lereng dengan Perkuatan Geocell Menggunakan Metode Elemen Hingga (PLAXIS 2D)

2021 ◽  
Vol 6 (2) ◽  
pp. 86
Author(s):  
Arzunnita Pramulandani ◽  
Indra Noer Hamdhan
Keyword(s):  
Tensile Strength ◽  
Slope Stability ◽  
Safety Factor ◽  
Horizontal Plane ◽  
Clay Soils ◽  
The Earth ◽  
Value Modeling ◽  
Minimum Safety Factor ◽  
Geocell Reinforcement

ABSTRAKLereng adalah permukaan bumi yang membentuk sudut kemiringan tertentu dengan bidang horizontal. Salah satu tindakan penanganan bencana longsor pada lereng melakukan perkuatan lereng menggunakan bahan geosintetik seperti geocell. Penelitian ini bertujuan untuk menganalisis pengaruh geocell terhadap kestabilan lereng, sehingga dapat diketahui karakteristik pemasangan geocell yang dapat meningkatkan faktor keamanan suatu lereng. Penelitian ini melakukan variasi jarak antar vertikal geocell dengan spesifikasi geocell dan data tanah yang telah didapatkan untuk dilakukannya tahap pemodelan dengan perkuatan geocell sampai mendapatkan nilai faktor keamanan lebih besar dari nilai faktor keamanan minimum. Pemodelan dilakukan menggunakan program PLAXIS 2D. Perkuatan dengan geocell efektif digunakan pada tanah lempung, sehingga pemasangan jarak vertikal geocell yang paling efektif terdapat pada jarak 1 meter berdasarkan panjang geocell 6 m, dengan kemiringan lereng 1:1, kuat tarik 14,5 MPa dan didapatkan nilai SF lebih besar dari /batas minimum, semakin rapat pemasangan geocell mampu meningkatkan nilai faktor keamanan dengan rata-rata sebesar 7%.Kata kunci: faktor keamanan, geocell, stabilitas lereng, timbunanABSTRACTSlope is the surface of the earth that forms a certain angle of inclination with a horizontal plane. One of the prevention to overcome landslides on slopes is to strengthen slopes using geosynthetic materials such as Geocells. This study aims to analyze the effect of geocells on slope stability, so that the characteristics of geocell installation can be known which can increase the safety factor of a slope. This study varies the distance between vertical geocells with geocell specifications and soil data that has been obtained for the modeling phase with geocell reinforcement to obtain the safety factor value greater than the minimum safety factor value. Modeling is done using 2D PLAXIS program. Reinforcement with geocells is effectively used on clay soils, so that the most effective vertical geocell spacing is at a distance of 1 meter based on the geocell length of 6 m, with a slope of 1: 1, tensile strength 14.5 MPa and the SF value is greater than / minimum limit, the denser the geocell installation can increase the value of the safety factor by an average of 7%.Keywords: safety factor, geocell, slope stability, embankment

A Comparative Study on Locating Critical Slip Surface in 2D and 3D Limit Equilibrium Stability Analysis of Slopes

2012 ◽  
Vol 446-449 ◽  
pp. 1905-1913
Author(s):  
Mo Wen Xie ◽  
Zeng Fu Wang ◽  
Xiang Yu Liu ◽  
Ning Jia
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Safety Factor ◽  
Slip Surface ◽  
Limit Equilibrium ◽  
Three Dimensional ◽  
Slope Stability Analysis ◽  
Equilibrium Stability ◽  
Critical Slip Surface ◽  
Minimum Safety Factor

The Various methods of optimization or random search have been developed for locating the critical slip surface of a slope and the related minimum safety factor in the limit equilibrium stability analysis of slope. But all these methods are based on a two-dimensional (2D) method and no one had been adapted for a search of the three-dimensional (3D) critical slip surface. In this paper, a new Monte Carlo random simulating method has been proposed to identify the 3D critical slip surface, in which assuming the initial slip to be the lower part of an ellipsoid, the 3D critical slip surface in the 3D slope stability analysis is located by minimizing the 3D safety factor of limit equilibrium approach. Based on the column-based three-dimensional limit equilibrium slope stability analysis models, new Geographic Information Systems (GIS) grid-based 3D deterministic limit equilibrium models are developed to calculate the 3D safety factors. Several practical examples, of obtained minimum safety factor and its critical slip surface by a 2D optimization or random technique, are extended to 3D slope problems to locate the 3D critical slip surface and to compare with the 2D results. The results shows that, comparing with the 2D results, the resulting 3D critical slip surface has no apparent difference only from a cross section, but the associated 3D safety factor is definitely higher.

Numerical Limit Equilibrium Analysis Method of Slope Stability Based on Particle Swarm Optimization

2013 ◽  
Vol 353-356 ◽  
pp. 247-251 ◽  
Author(s):  
Sheng Nian Wang ◽  
Chong Shi ◽  
Yu Llong Zhang ◽  
Kai Hua Chen
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Equilibrium Analysis ◽  
Sliding Surface ◽  
Limit Equilibrium Analysis ◽  
Field Surveys ◽  
Approach Method ◽  
Minimum Safety Factor ◽  
Good Agreement

The limit equilibrium method based on the results of numerical calculation is an important method for slope stability analysis. In this paper, PSO is used to control the locations of trailing edge and shear outlet, while the progressive approach method is used to control the radius of slope sliding surface. It achieves the location search of the potential sliding surface as well as the calculation of the corresponding safety factor. So the minimum safety factor and the location of the most dangerous potential sliding surface are determined. Taking a slope section plane of Xiluodu Hydropower Station as an example, the most dangerous sliding surface having been searched out is compared with the results of field surveys. It shows that the results of the proposed method are in good agreement with the actual engineering, and the validity and the correctness of the approach are also verified.

scholarly journals DESAIN ULANG BADAN JALAN DENGAN GEOTEKSTIL SEBAGAI ALTERNATIF PENINGKATAN STABILITAS LERENG

2021 ◽  
Vol 15 (1) ◽  
pp. 32
Author(s):  
Rosiane Agustin ◽  
Handi Sudardja
Keyword(s):  
Tensile Strength ◽  
Slope Stability ◽  
Safety Factor ◽  
Type Iii ◽  
The Road ◽  
Toll Road ◽  
Road Section ◽  
Service Period ◽  
Cut And Fill

Abstract The condition of Ciawi – Sukabumi Toll Road section 2 has various topographies with difference of elevation. To get a safe and comfortable road alignment, cut and fill works are carried out. During the landfill work at STA.18 + 700 – STA.18 + 900 landslides occurred on the slopes. To ensure that the slope conditions are safe during the service period, redesign of the road bodies is carried out to produce slopes with a safety factor value (SF) ≥ 1.25 (Bowles, 1993) and SF ≥ 1.10 if the earthquake is calculated (SNI 8460: 2017). The slope stability phase is calculated on the original slope conditions by taking into account the potential for earthquakes at the research location. This analysis was carried out with manual calculations and the GeoStudio 2018 R2 sub program SLOPE/W, both calculations using the Simplified Bishop Method. The results of the sliding analysis obtained the original slope SF without considering the earthquake of 1.48 for manual calculations and 1.41 for SLOPE/W. Then the SF of the slopes with the effect of the earthquake is 0.79 with manual calculations and 0.82 with SLOPE/W, it is found that all conditions are basic sliding. The analysis showed that the earthquake had a significant impact on slope stability, with a decrease in slope SF of 44.23% and the slope was categorized as unstable. Then, it is recommended to add woven geotextile with a tensile strength of 200 kN and a river stone gabion counterweight. From the modeling in each condition that has been simulated, it is found that the countermeasures are Type III with slope SF 1.15 as a redesign. . Keywords: Bishop, Geotextile, Safety factor, SLOPE/W, 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.

scholarly journals Plane Sailing or Horizontal Navigation

1956 ◽  
Vol 9 (4) ◽  
pp. 454-462
Author(s):  
D. W. Waters
Keyword(s):  
Eighteenth Century ◽  
Horizontal Plane ◽  
The Earth ◽  
Course Of Action ◽  
Plane Area ◽  
As If

Professor Taylor contends that the expression used to describe a course of action so simple as to leave no room for mistakes is plain sailing; that this is nautical in origin in that it derives from a simple or plain system of navigation based upon the use of a simple or plain (manifestly foolproof) chart; that this system of navigation was known originally as plain (simple) sailing—which expression she traces back to Richard Norwood's Doctrine of Plaine and Sphericall Triangles of 1631, and that it was sophisticated into plane sailing in the eighteenth century in the belief—which she holds to be erroneous—that the expression described a form of navigation based upon the use of a plane or flat chart on which the Earth was drawn as if the Earth and oceans lay in one horizontal plane area and not upon the surface of a sphere or, more accurately, ellipsoid; and, finally, that the Admiralty Navigation Manual is in error in teaching mariners that ‘to regard certain small triangles as plane… gives rise to the expression plane sailing, which is popularly referred to as if plane were spelt plain and the sailing free from difficulty’.

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 Application of Harmony Search Algorithm to Slope Stability Analysis

Land ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1250
Author(s):  
Sina Shaffiee Haghshenas ◽  
Sami Shaffiee Haghshenas ◽  
Zong Woo Geem ◽  
Tae-Hyung Kim ◽  
Reza Mikaeil ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Safety Factor ◽  
Search Algorithm ◽  
Limit Equilibrium ◽  
Harmony Search ◽  
Harmony Search Algorithm ◽  
Slope Stability Analysis ◽  
Unit Weight ◽  
Slope Safety

Slope stability analysis is undoubtedly one of the most complex problems in geotechnical engineering and its study plays a paramount role in mitigating the risk associated with the occurrence of a landslide. This problem is commonly tackled by using limit equilibrium methods or advanced numerical techniques to assess the slope safety factor or, sometimes, even the displacement field of the slope. In this study, as an alternative approach, an attempt to assess the stability condition of homogeneous slopes was made using a machine learning (ML) technique. Specifically, a meta-heuristic algorithm (Harmony Search (HS) algorithm) and K-means algorithm were employed to perform a clustering analysis by considering two different classes, depending on whether a slope was unstable or stable. To achieve the purpose of this study, a database made up of 19 case studies with 6 model inputs including unit weight, intercept cohesion, angle of shearing resistance, slope angle, slope height and pore pressure ratio and one output (i.e., the slope safety factor) was established. Referring to this database, 17 out of 19 slopes were categorized correctly. Moreover, the obtained results showed that, referring to the considered database, the intercept cohesion was the most significant parameter in defining the class of each slope, whereas the unit weight had the smallest influence. Finally, the obtained results showed that the Harmony Search algorithm is an efficient approach for training K-means algorithms.

Proof-Of-Concept of a Thermal Barrier Coated Titanium Cooling Layer for an Inside-Out Ceramic Turbine

2021 ◽  
Author(s):  
Antoine Gauvin-Verville ◽  
Patrick K. Dubois ◽  
Benoit Picard ◽  
Alexandre Landry-Blais ◽  
Jean-Sébastien Plante ◽  
...  
Keyword(s):  
Polymer Composite ◽  
Safety Factor ◽  
Gas Turbines ◽  
High Efficiency ◽  
Cooling Power ◽  
Thermal Barrier ◽  
Inlet Temperature ◽  
Turbine Stage ◽  
Minimum Safety Factor ◽  
Inside Out

Abstract Increasing turbine inlet temperature (TIT) of recuperated gas turbines would lead to simultaneously high efficiency and power density, making them prime candidates for low-emission aeronautics applications, such as hybrid-electric aircraft. The Inside-out Ceramic Turbine (ICT) architecture achieves high TIT by using compression-loaded monolithic ceramics. To resist inertial forces due to blade tip speed exceeding 450 m/s, the shroud of the ICT is made of carbon-polymer composite, wound around a metallic cooling ring. This paper demonstrates that it is beneficial to use a titanium alloy cooling ring with a thermal barrier coating (TBC), rather than nickel superalloys, for the interstitial cooling ring protecting the carbon-polymer from the hot combustion gases. A numerical Design of Experiments (DOE) analysis shows the design trade-offs between the minimum safety factor and the required cooling power for multiple geometries. An optimized high-pressure first turbine stage of a 500 kW microturbine concept using ceramic blades and a titanium cooling ring in an ICT configuration is presented. Its structural performance (minimum safety factor of 1.4) as well as its cooling losses (2% of turbine stage power) are evaluated. Finally, a 20 kW-scale prototype is tested at 300 m/s and a TIT of 1375 K during 4hrs to demonstrate the viability of the concept. Experiments show that the polymer composite was kept below its maximum safe operating temperature and components show no early signs of degradation.

Influence of Rice Husk Ash on Characteristics of Earth Cement Blocks

MRS Advances ◽  
2020 ◽  
Vol 5 (54-55) ◽  
pp. 2793-2805
Author(s):  
Vasanthan Seevaratnam ◽  
Dilukshan Uthayakumar ◽  
Navaratnarajah Sathiparan
Keyword(s):  
Tensile Strength ◽  
Construction Industry ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Partial Replacement ◽  
Allowable Limit ◽  
Flexural Tensile Strength ◽  
The Earth ◽  
Cement Block ◽  
Great Reactivity

AbstractThis paper presents an experimental study on the characteristics of earth cement blocks with Rice Husk Ash (RHA) as a partial replacement to cement. The replacement of RHA content is limited to 0%, 5%, 10%, 15% and 20% by mass of the total binder in the earth cement block. The experiments on earth cement blocks investigate the compressive strength and flexural tensile strength for mechanical properties and water absorption, sorption rate and erosion against water spray for its durability. Due to the high content of SiO2 in RHA with great reactivity, a significant increase in the compressive and flexural tensile strength of earth cement blocks was observed up to 10% RHA content. However, the durability of earth cement blocks becomes adverse with the increasing percentage of RHA replacement, but within the allowable limit. The experimental results indicate that to some extent, RHA based earth cement blocks have a significant potential for reduction in cement used in the construction industry.

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