scholarly journals The Analysis on Concrete-Face Rock-Fill Dam by Finite Element Method

2021 ◽  
Vol 804 (2) ◽  
pp. 022008
Author(s):  
Jianyou Zhang ◽  
Rong Du
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rock Fill ◽  
Concrete Face ◽  
Element Method

scholarly journals Analisis Stabilitas Timbunan pada Tanah Dasar Berbentuk Lereng dengan Metode Elemen Hingga

2021 ◽  
Vol 6 (3) ◽  
pp. 179
Author(s):  
Mufidhiansyah Fahmi ◽  
Ikhya Ikhya
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Slope Stability ◽  
Safety Factor ◽  
Sand Pile ◽  
Rock Fill ◽  
Geometry Analysis ◽  
Element Method

ABSTRAKAnalisis menggunakan program PLAXIS 2D dengan tinggi timbunan dan kemiringan tanah dasar bervariasi tanpa dan dengan perkuatan rock fill sehingga diperoleh kebutuhan rock fill agar faktor keamanan memenuhi syarat. Hasil analisis dengan kemiringan tanah dasar 1V:8H diperoleh kebutuhan rock fill timbunan lempung dengan tinggi 5m, 10m, 15m dan 20m sebesar 0%; 24,7%; 45,5% dan 59,1% sedangkan timbunan pasir sebesar 14,5%; 43,2%; 62,4% dan 71,4%. Pada kemiringan tanah dasar 1V:6H diperoleh kebutuhan rock fill masing-masing ketinggian timbunan lempung sebesar 5%; 45,8%; 59,3% dan 66.6%, sedangkan timbunan pasir sebesar 33,1%; 62,3%; 71,9% dan 73,2%. Pada kemiringan tanah dasar 1V:4H diperoleh kebutuhan rock fill masing-masing ketinggian timbunan lempung sebesar 48,9%; 66,7%; 75,6% dan 81,3%; sedangkan timbunan pasir sebesar 60,1%; 72,6%; 80,5% dan 84%. Variasi jenis mesh menghasilkan faktor keamanan yang tidak signifikan antar jenis mesh dikarenakan lapisan timbunan yang dimodelkan relatif rapat. Analisis geometri tanah dasar bertangga dengan lurus tidak menunjukkan pengaruh yang signifikan terhadap faktor keamanan.Kata kunci: stabilitas lereng, timbunan, tanah dasar, rock fill, metode elemen hingga, PLAXIS 2D ABSTRACTAnalysis using PLAXIS 2D program with varying heights and slopes of subgrade without and with rock fill reinforcement in order to obtain the need for rock fill so that the safety factor meets the requirements. The results of the analysis with a subgrade slope of 1V: 8H obtained the need for rock fill clay pile with a height of 5m, 10m, 15m and 20m of 0%; 24.7%; 45.5% and 59.1% while the sand pile was 14.5%; 43.2%; 62.4% and 71.4%. At a subgrade slope of 1V: 6H, the required rock fill height for each clay pile is 5%; 45.8%; 59.3% and 66.6%, while the sand pile was 33.1%; 62.3%; 71.9% and 73.2%. At 1V: 4H subgrade slope, the required rock fill height for each clay pile height is 48.9%; 66.7%; 75.6% and 81.3%; while the sand pile was 60.1%; 72.6%; 80.5% and 84%. Variation of mesh types resulted in insignificant safety factor between mesh types because the modeled embankment layer was relatively tight. The geometry analysis of the straight stepped subgrade did not show a significant effect on the safety factor.Keywords: slope stability, embankment, subgrade, rock fill, Finite Element method, PLAXIS 2D

scholarly journals An XFEM-Based Analysis of Concrete Face Cracking in Rockfill Dams

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Binpeng Zhou ◽  
Junrui Chai ◽  
Jing Wang ◽  
Heng Zhou ◽  
Lifeng Wen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Crack Initiation ◽  
Rockfill Dam ◽  
Initiation And Propagation ◽  
The Face ◽  
Stress And Deformation ◽  
Concrete Face ◽  
Element Method

The concrete face of a rockfill dam is a long and thin slab structure, which is highly susceptible to fracture when subjected to the settlement of the dam. The study of the generation and propagation of cracks in the concrete face of rockfill dams is of great significance to dam construction and face crack prevention. In this study, the initiation and propagation of cracks in the concrete face of a rockfill dam are investigated using an extended finite element method (XFEM) and ABAQUS software for the Gongboxia concrete-face rockfill dam. A numerical model for this dam is established using a finite element method, and the face stress and deformation distributions are obtained. Based on the results, a numerical model is built to find the location where cracks are initiated in the face. The displacement of the entire model is treated as the equivalent displacement for the numerical model. XFEM is utilized throughout the modeling process to obtain the stress concentration, crack initiation, and crack propagation in the concrete face, and an analysis of crack initiation and propagation is conducted. Finally, the effects of the thickness of concrete covers and reinforcement layers on the stress intensity of crack tips are also discussed using the established numerical model, and techniques for controlling the fracturing of the concrete face have been proposed in this paper.

A case study of hydraulic fracturing using finite element methods

1999 ◽  
Vol 36 (5) ◽  
pp. 861-875 ◽  
Author(s):  
Axel KL Ng ◽  
John C Small
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hydraulic Fracturing ◽  
Hydraulic Fracture ◽  
Water Pressure ◽  
Numerical Procedure ◽  
Tensile Fracture ◽  
Rock Fill ◽  
The Core ◽  
Element Method

Hydraulic fracturing can occur in the clay core of an earth and rock-fill dam if the vertical effective stress in the core is reduced to levels that are small enough to allow a tensile fracture to occur. This situation may arise if the total stress in the core is reduced by the "arching effect" where the core settles relative to the rock-fill shoulders of the dam. Water pressure increases in the core which occur on first impounding of water will reduce effective stresses further, and if they reach low enough values, a fracture will occur. The design of earth dams to resist hydraulic fracture is therefore of great importance (especially those dams with thin vertical or near-vertical central cores), as there have been several dam failures in the past that have been attributed to hydraulic fracture. This paper presents a method of predicting hydraulic fracture in the core of earth and rock-fill dams by using a numerical procedure based on the finite element method. The finite element procedure makes use of special joint elements that allow fluid flow and fracture to be modeled and is an advance over previous methods in that it allows the complete history of pore-pressure development in the core of a dam to be simulated. A study of the behaviour of the Hyttejuvet Dam, which was thought to have failed due to hydraulic fracturing, is also carried out, and the results of the analysis suggest that the failure of the dam was probably due to hydraulic fracturing that occurred during first filling of the reservoir. The fractures predicted occur at about the location that the actual fracture was thought to have been located. Key words: hydraulic fracture, earth and rock-fill dams, finite element method.

Three-Dimensional Seepage Field Analysis of Thick Overburden CFRD after Sealing Failure

2013 ◽  
Vol 457-458 ◽  
pp. 797-800
Author(s):  
Wen She He ◽  
Liang Ming Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Field Analysis ◽  
Seepage Field ◽  
Related Factors ◽  
Rock Fill ◽  
Thick Overburden ◽  
Sealing Failure ◽  
Concrete Face

According to characteristics of the thick overburden dam and the current and main problems on seepage of the thick overburden concrete face rock-fill dam, this paper takes finite element method to analyze the three-dimensional seepage field of thick overburden CFRD after the joint sealing failure, and studies the seepage field distribution of the CFRD after sealing failure, and analyzes the sealing failure position and influences of seam length on each seepage elements variation. In this paper, taking the thick overburden CFRD in xinjiang as an example, effects of the joint sealing failure on seepage related factors are discussed , the change rules of saturated faceseepage discharge and seepage gradient of the thick overburden CFRD are obtained by studying,. The research results can provide a reference for a parallel engineering design and construction.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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