scholarly journals ANALISA STABILITAS LERENG DAN ALTERNATIF PERKUATAN TANAH PADA JALUR KERETA API CEPAT JAKARTA-BANDUNG MENGGUNAKAN APLIKASI PLAXIS 8.6

BANGUNAN ◽  
2021 ◽  
Vol 26 (1) ◽  
pp. 29
Author(s):  
Ainun Nafis ◽  
Eko Setyawan ◽  
Mohammad Musthofa Al Mohammad Musthofa
Keyword(s):  
Finite Element ◽  
Safety Factor ◽  
High Speed ◽  
Earthquake Dynamics ◽  
High Speed Rail ◽  
Alternative Reinforcement ◽  
Embankment Slope ◽  
Geological Conditions ◽  
Rail Line ◽  
The Stability

Abstrak: Masalah dalam perencanaan struktur jalan kereta seperti tinggi lereng embankment yang lebih dari sama dengan 6 m, tanah asli yang tergolong sedang lunak, dan merupakan daerah rawan terjadinya longsor merupakan alasan dilakukannya penelitian ini. Hal tersebut didukung oleh hasil uji lab tanah, kondisi geografis dan geologis Kabupaten Purwakarta berupa bukit dan lembah yang terbentuk dari endapan batuan sedimen dan aluvium vulkanik dengan kemiringan lahan 8-40%. Oleh karena itu penelitian ini bertujuan untuk mengetahui stabilitas lereng embankment berupa nilai safety factor pada jalur kereta cepat Jakarta-Bandung daerah konstruksi DK70+150.00 sampai DK70+181.88. Adapun analisis numerik yang dilakukan pada penelitian ini menggunakan program Plaxis 8.6 yang dikembangkan berdasarkan metode Finite Element dengan model Mohr-Coulomb. Proses analisis dengan menginput parameter material yang dibutuhkan berdasarkan Mohr-Coulomb. Hasil analisis berupa angka safety factor yang menunjukkan kondisi stabilitas suatu lereng embankment. Penambahan alternatif perkuatan lereng embankment berupa cerucuk (micropile), bronjong (gabion) dan geotextile sebagai upaya pencegahan adanya kelongsoran jangka pendek dan panjang pada lereng embankment yang tidak stabil. Hasil analisis lereng embankment kereta api cepat Jakarta-Bandung DK70+150 sampai DK70+181.88 kondisi eksisting sebesar ΣMSF 1,1565 (cek global) dan ΣMSF 1,0515 (cek dinamik gempa) yang artinya lereng dalam kondisi tidak stabil dan perlu penambahan alternatif perkuatan. Berdasarkan simulasi kombinasi alternatif perkuatan. Menunjukkan kombinasi alternatif perkuatan geotextile dengan micropile menghasilkan angka safety factor ΣMSF 1,8151 (cek stabilitas global) dan ΣMSF 1,6262 (cek stabilitas akibat beban dinamik gempa).Kata-kata kunci: stabilitas lereng embankment, Plaxis 8.6, safety factor, kereta cepat Jakarta-BandungAbstract: Problems in the design of the railway structure such as the embankment slope height of 6 m, the original soil which is classified as moderately soft, and is an area prone to landslides is the reason for conducting this research. This is supported by the results of soil lab tests, geographical and geological conditions of Purwakarta Regency in the form of hills and valleys formed from sedimentary rock deposits and volcanic alluvium with a slope of 8-40%. Therefore, this study aims to determine the stability of the embankment slope in the form of the safety factor value on the Jakarta-Bandung high-speed rail line in the construction area DK70+150.00 to DK70+181.88. The numerical analysis carried out in this study used the Plaxis 8.6 program which was developed based on the Finite Element method with the Mohr-Coulomb model. The analysis process by inputting the required material parameters based on Mohr-Coulomb. The results of the analysis are in the form of safety factor numbers which indicate the stability condition of an embankment slope. The addition of alternative reinforcement for embankment slopes in the form of micropile, gabion (gabion) and geotextile as an effort to prevent short and long term landslides on unstable embankment slopes. The results of the slope analysis of the Jakarta-Bandung high-speed rail embankment DK70+150 to DK70+181.88 existing conditions of MSF: 1.1565 (global check) and MSF: 1.0515 (earthquake dynamics check) which means the slope is in an unstable condition and needs additional alternative reinforcement. Based on the simulation of alternative reinforcement combinations. Showing the alternative combination of geotextile reinforcement with micropile produces a safety factor number MSF: 1.8151 (check global stability) and MSF: 1.6262 (check stability due to dynamic earthquake loads)..Keywords: embankment slope stability, Plaxis 8.6, safety factor, Jakarta-Bandung high-speed train

Mechanics Analysis of Grade V Surrounding Rock Primary Support in Maanziliang Tunnel

2012 ◽  
Vol 164 ◽  
pp. 414-417
Author(s):  
Jia Ming Han
Keyword(s):  
Finite Element ◽  
Safety Factor ◽  
Surrounding Rock ◽  
Qinling Mountains ◽  
The Finite Element Method ◽  
Highway Tunnel ◽  
Geological Conditions ◽  
The Stability ◽  
Primary Support ◽  
Rock Section

Commonly used finite element strength reduction to calculate the safety factor of slope，to analyze the stability of the slope[1～3]. Recently it also proposed the methods to evaluate the safety factor for the stability of surrounding rock of underground chambers and supporting structural mechanics[4～6]. For Qinling Mountains of the complex geological conditions in the Maanziliang highway tunnel, this article use the finite element method from the bolt resist tension, bolt length, the force of sprayed layer of concrete to computing gradeⅤsurrounding rock section of primary support safety factor, to give evaluation to support mechanics of the Maanziliang tunnel.

Analysis of Factors Affecting Stability of Tunnel

2014 ◽  
Vol 496-500 ◽  
pp. 2520-2522
Author(s):  
Xin Zhe Li ◽  
Juan Liu ◽  
Xin Liang Li
Keyword(s):  
Construction Projects ◽  
High Speed ◽  
Structural Characteristics ◽  
High Speed Rail ◽  
Factors Affecting ◽  
Construction Methods ◽  
Western Area ◽  
Geological Conditions ◽  
Geological Factors ◽  
The Stability

Along with the high-speed rail era, more and more railway construction projects are held in China western area, but the geological conditions in these areas are often complex, so it brings difficulty to the construction of tunnel in building railways. This paper studies the factors influencing the stability of tunnels. It divides these factors into two categories: engineering geological factors and engineering technological factors. Furthermore, it analyzes other factors that affect the stability of tunnels, such as structural characteristics of surrounding rock, mechanics properties of rock mass and construction methods.

scholarly journals A Fuzzy Optimization Model for High-Speed Railway Timetable Rescheduling

2012 ◽  
Vol 2012 ◽  
pp. 1-22 ◽  
Author(s):  
Li Wang ◽  
Yong Qin ◽  
Jie Xu ◽  
Limin Jia
Keyword(s):  
Optimization Model ◽  
High Speed ◽  
Fuzzy Optimization ◽  
Soft Constraints ◽  
Accurate Approximation ◽  
Total Delay ◽  
High Speed Rail ◽  
High Speed Railway ◽  
Tolerance Approach ◽  
Rail Line

A fuzzy optimization model based on improved symmetric tolerance approach is introduced, which allows for rescheduling high-speed railway timetable under unexpected interferences. The model nests different parameters of the soft constraints with uncertainty margin to describe their importance to the optimization purpose and treats the objective in the same manner. Thus a new optimal instrument is expected to achieve a new timetable subject to little slack of constraints. The section between Nanjing and Shanghai, which is the busiest, of Beijing-Shanghai high-speed rail line in China is used as the simulated measurement. The fuzzy optimization model provides an accurate approximation on train running time and headway time, and hence the results suggest that the number of seriously impacted trains and total delay time can be reduced significantly subject to little cost and risk.

Design of High Speed Railway Tunnel and its Construction Method in Abrupt Slope with Loose Rockmass

2014 ◽  
Vol 580-583 ◽  
pp. 1096-1099 ◽  
Author(s):  
Xiao Jun Zhou ◽  
Bo Jiang ◽  
Rui Yang ◽  
Chao Ning
Keyword(s):  
High Speed ◽  
Rational Design ◽  
Composite Fiber ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
Working Face ◽  
Tunneling Method ◽  
Geological Conditions ◽  
The Stability ◽  
Tunnel Portal

This paper mainly deals with the structural design of high speed railway tunnel and its driving method in abrupt slope with loose rockmass, meanwhile summarizes the connection between tunnel portal and bridge abutment in loose rockmass according to complicated landform and geology. The anti-slide piles are adopted to retain the stability of abrupt slope near the tunnel portal. In order to eliminate the risk and cost in tunnel construction, four bench cut method is invented to satisfy the safe excavation of loose rockmass in the tunnel. Composite fiber rockbolt is also employed to keep the stability of working face while driving the tunnel. The innovative tunneling method presented in the paper can be applied to guide the rational design and economical construction of high speed railway tunnels in loose surrounding rock under harsh geological conditions.

Modeling Support Effects: Finite Element and Experimental Modal Methods

1996 ◽  
Author(s):  
Jonathan R. Buckles ◽  
Keith E. Rouch ◽  
John R. Baker
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Transfer Functions ◽  
Coupling Effects ◽  
Support Effects ◽  
Critical Speeds ◽  
Modal Data ◽  
The Stability ◽  
Direct Use ◽  
Reduced Matrices

The effects of support/foundation dynamics are often significant in high speed turbomachinery, and can affect the stability and response to unbalance. In some cases additional critical speeds are introduced, related to resonances in the foundation or interaction with rotor resonances of foundation resonances. This paper reviews several methods for representing these effects, including (1) reduced matrices from finite element substructures (ANSYS, for example), (2) matrices generated from modal data, and (3) direct use of experimental transfer functions. These methods are implemented in a finite element rotor program in a PC-DOS environment. The application of the methods to two laboratory rotor configurations described and results presented. Situations with a foundation resonance above and near the rotor critical are included. The importance of including coupling effects between supports is shown.

Who Rides These Things?

2010 ◽  
Author(s):  
Jack E. Heiss
Keyword(s):  
High Speed ◽  
Market Demand ◽  
Market Information ◽  
High Speed Rail ◽  
Development Patterns ◽  
Trip Purpose ◽  
Passenger Rail ◽  
Rail Line ◽  
Market Capture ◽  
Investment Grade

While planners and politicians alike go about kicking the tires of various trains, and traveling abroad on fact-finding missions about HSR, the question remains whether Americans will patronize high-speed rail in sufficient number to justify the investment. A common practice is to identify an existing or abandoned rail line as the candidate route that connects population centers, identify the former stations for rehabilitation, select a technology, and then perform an investment-grade ridership study to determine whether sufficient revenues will be generated. This approach may prove sufficient in the upgrading of an existing conventional service, or re-establishing a previous service in those areas of the country with a long history of passenger rail. When approaching newer developed areas such as the Sunbelt cities, the inter-relationship of development patterns and fixed-guideway passenger services is not established. Those development patterns were influenced by the automobile, not by guideway-based transportation. A different approach is needed when history is not a guide. While the selection of the population centers to be served at the outset is appropriate and makes for a basic identification of the market to be served, it does not reveal the actual destinations that are interest to the travelers. The next step is to more thoroughly investigate travel between those points. That investigation should include surveys to determine trip purpose, identify the main attractors in the markets, the demographics of the travelers and how time is valued by the travelers. Finally, estimates must be made of the absolute numbers of those traveling. Additionally, examination of the current travel patterns through the patronage of existing services can provide clues to the market demand. The acquisition of this market information then allows the planners to design a transportation product that will appeal to the potential customers and make a determination of potential revenue. Even when certain parameters of a system are set because of geography or availability of infrastructure, market information can guide improvements to maximize market capture. This paper will examine those data that are important to a high-speed rail plan and how some system decisions directly affect the ability of the transportation product offered to satisfy the needs of the traveling public. “Build it and they will come” cannot be trusted to repay the massive investment required by high-speed rail.

Design, Modeling and Finite Element Static Analysis of a New Two Axis Solar Tracker Using SolidWorks/COSMOSWorks

2013 ◽  
Vol 446-447 ◽  
pp. 738-743 ◽  
Author(s):  
Fateh Ferroudji ◽  
Toufik Ouattas ◽  
Chérif Khélifi
Keyword(s):  
Finite Element ◽  
Static Analysis ◽  
Safety Factor ◽  
Equivalent Stress ◽  
Maximum Displacement ◽  
3D Cad ◽  
Optimum Position ◽  
Maximum Equivalent Stress ◽  
Solar Tracker ◽  
The Stability

This paper presents the now design, modeling and static analysis of a new two-axis solar tracker (Azimuth and Altitude). The tracker is an electro-hydraulic device that keeps photovoltaic panels in an optimum position perpendicularly to the solar radiation during daylight hours. The tracker of 24 m² panel’s size was designed using the SolidWorks 3D CAD software. The finite element method (FEM) is adopted to ensure the stability and the reliability of the tracker. COSMOSWorks was used to determine displacement, equivalent stress and safety factor of the tracker under its own weight and wind load critical, namely wind speed of 130 km/h. Simulation results show that the maximum displacement of the structure is 1.18 mm, the level of the maximum equivalent stress is 74.43 MPa and the safety factor is about 3. The tracker structure completely satisfies the design requirements.

scholarly journals Stability analysis of rock slope and calculation of rock lateral pressure in foundation pit with structural plane and cave development

2021 ◽  
Author(s):  
Jin Xu ◽  
Yansen Wang
Keyword(s):  
Safety Factor ◽  
Rock Slope ◽  
Lateral Pressure ◽  
Rock Foundation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Failure Characteristics ◽  
Karst Caves ◽  
Geological Conditions ◽  
The Stability

Abstract In this study, numerical simulations were carried out to analyze the influence of caves in different positions and shapes, in combination with structural planes, on the stability of the slope and the failure characteristics of a rock slope in a deep foundation pit with high inclination structural planes and cave development. The schemes for substituting a single karst cave for karst caves were constructed. Based on the penetration failure characteristics of karst caves between parallel structural planes, methods for calculating the safety factor of the rock foundation pit and the upper bound of the lateral pressure of the supporting structure under the combined influence of the caves and structural planes were developed, which can be used to assess the safety factor of a rock mass and to calculate the lateral pressure under complex geological conditions.

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