scholarly journals STUDI PARAMETRIK JARAK PENGARUH PENURUNAN DAN PERGERAKAN LATERAL AKIBAT VACUUM PRE-LOADING PADA DAMAGE AREA SEKITAR

2020 ◽  
Vol 3 (4) ◽  
pp. 1091
Author(s):  
Mario Oktavianus Lay ◽  
Inda Sumarli ◽  
Ali Iskandar
Keyword(s):  
Lateral Displacement ◽  
Distance Effect ◽  
Soil Improvement ◽  
Deformation Analysis ◽  
Finite Element Program ◽  
Damage Area ◽  
Dimensional Finite Element ◽  
Element Program ◽  
Surcharge Load ◽  
New Material

 ABSTRACTSoil-fill is type of soil with low bearing capacity, therefore it’s need soil improvement to resolve the settlement. Soil improvement divided into 2 categories, namely methods that use new material and reinforcement. Commonly used method is PVD combined with vacuum pre-loading. Pre-loading is an application to increase surcharge load which aims to reduce the primary settlement occurs. Pre-loading not only causes settlement, but also cause lateral displacement which cause damage to the outside area around the improvement area. Thus, an analysis of distance effect between the improvement boundary and outside of improvement area in needed to prevent damage to utility around the site. Deformation analysis will be assisted by 2-Dimensional finite element program. Width of the improvement area is 80 meters with a depth of PVD is 14.5 meters to verify parameters. With the parameters that have been verified, an analysis is carried out on PVD with depth of 5m to 30m to determined distance effect of settlement and lateral displacement from boundary of the improvement area to until the value of the settlement and lateral displacement reaches <2cm. Result of studies on general is to find distance effect caused by vacuum pre-loading in areas outside the improvement boundary.ABSTRAKTanah hasil urugan merupakan jenis tanah lunak dengan daya dukung yang rendah, sehingga terjadi penurunan konsolidasi dan membutuhkan perbaikan. Perbaikan tanah dibagi menjadi 2 kategori, yaitu metode yang menggunakan material baru dan menggunakan pemanfaatan perkuatan. Metode yang umum digunakan adalah PVD yang dikombinasikan dengan vacuum pre-loading. Pre-loading adalah aplikasi penambahan beban surcharge yang bertujuan agar terjadinya penurunan primer. Pre-loading tidak hanya menyebabkan penurunan, tetapi juga menyebabkan terjadinya perpindahan secara lateral kearah luar yang dapat menyebabkan kerusakan pada area luar disekitar daerah perbaikan. Sehingga, dibutuhkan analisis jarak pengaruh antara batas lahan perbaikan dengan daerah luar perbaikan, untuk mencegah kerusakan pada struktur atau utilitas disekitar lokasi perbaiki. Analisis deformasi menggunakan program elemen hingga 2D. Lebar area perbaikan 80 meter dengan kedalaman PVD 14.5 meter untuk melakukan verifikasi parameter. Dengan parameter yang telah diverifikasi, dilakukan analisis pada PVD dengan kedalaman 5m hingga 30m untuk mengetahui jarak pengaruh penurunan dan pergerakan lateral dari batas lahan perbaikan hingga nilai penurunan dan pergerakan lateral <2 cm. Hasil studi secara umum menunjukkan seberapa besar jarak pengaruh yang diakibatkan oleh vacuum pre-loading pada daerah diluar batas perbaikan.

Comparative Analysis of Several Construction Scheme of a Large-Sized Tie-Arch Aqueduct

2011 ◽  
Vol 94-96 ◽  
pp. 2350-2354
Author(s):  
Shu Zhong Lei ◽  
Zhong Xin Wang ◽  
Jian Ting Xu ◽  
Chi Peng Liu
Keyword(s):  
Comparative Analysis ◽  
Prestressed Concrete ◽  
Three Dimensional ◽  
Stability Control ◽  
River Diversion ◽  
Finite Element Program ◽  
Dimensional Finite Element ◽  
Element Program ◽  
Stress And Deformation ◽  
Three Dimensional Finite Element

An aqueduct of larger-span prestressed concrete arch structure for river diversion project is located in coastal areas, and raises difficult questions on deformation and stability control of the construction process due to greater wind load and poor soil. Due to the limited width of bracket erection, this paper put forward five possible construction schemes, and does the comparative analysis using three-dimensional finite element program, and gets the economic and reasonable one. Finally conduct a pressure test after the bracket erection, and verify the analysis results using measured stress and deformation data.

scholarly journals Influences of avalanche-defence snow-supporting structures on ground temperature in Alpine permafrost terrain

2000 ◽  
Vol 31 ◽  
pp. 422-426 ◽  
Author(s):  
Marcia Phillips ◽  
Perry Bartelt ◽  
Marc Christen
Keyword(s):  
Thermal Characteristics ◽  
Temperature Measurements ◽  
Finite Element Program ◽  
Ground Temperatures ◽  
Dimensional Finite Element ◽  
Element Program ◽  
Temporal And Spatial ◽  
Supporting Structures ◽  
Borehole Core

AbstractTo investigate the effects of steel snow-supporting structures on the thermal regime of the ground in typical Alpine permafrost avalanche terrain, ground temperatures were monitored and simulated on an avalanche slope equipped with experimental snow-supporting structures. Temperature measurements were effected in lm boreholes above and below a row of snow nets and in two 18 m boreholes located between the structures and in a reference location. The presence of the structures can induce modifications of the temporal and spatial snow-cover distribution, leading to differences in active-layer temperatures just below and above the structures: snow accumulates above the supporting surface of the structures, and frequently there is less snow below. The long-term thermal effect of these variations near a snow net was simulated using a two-dimensional finite-element program based on heat conduction. The material and thermal characteristics of the ground simulated are obtained from temperature measurements and from borehole-core information.

Finite Element Analysis of Synchronous Belt Tooth Failure

1993 ◽  
Vol 207 (2) ◽  
pp. 145-153 ◽  
Author(s):  
K W Dalgarno ◽  
A J Day ◽  
T H C Childs
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Model ◽  
Element Model ◽  
Element Analysis ◽  
Finite Element Program ◽  
Interface Elements ◽  
Dimensional Finite Element ◽  
Element Program ◽  
Critical Strains

This paper describes a finite element analysis of a synchronous belt tooth under operational loads and conditions with the objective of obtaining a greater understanding of belt failure by tooth root cracking through an examination of the strains within the facing fabric in the belt. The analysis used the ABAQUS finite element program, and was based on a two-dimensional finite element model incorporating a hyperelastic material model for the elastomer compound. Contact between the belt tooth face and the pulley groove was modelled using surface interface elements which allowed only compression and shear forces at the contact surfaces. It is concluded that the critical strains in the facing fabric of the belt, and therefore the belt life, are largely determined by the tangential loading condition on the belt teeth.

Spatial Analysis of Continuous Rigid Frame High Pier under Completed Bridge State

2011 ◽  
Vol 280 ◽  
pp. 183-185 ◽  
Author(s):  
Ya Xun Yang ◽  
Lei Sun
Keyword(s):  
Deformation Analysis ◽  
Radius Of Curvature ◽  
Finite Element Program ◽  
Horizontal Alignment ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Element Program ◽  
Stress And Deformation ◽  
High Pier ◽  
Rigid Frame Bridge

The continuous rigid frame bridge was taken as a typical background, considering the horizontal alignment curvature of the continuous rigid frame bridge space by the force, by selecting a different radius of curvature and height of piers, using the finite element program to the completed bridge state into the curve of the high continuous rigid frame bridge pier stress and deformation analysis, focused on the effects of curvature and height of piers. Analysis of it, provided the design suggestions for the curve corresponding rigid frame bridge.

Analysis on Avoid Incision in Underground Engineering Reinforcement Technique against Cutting Resistance

2013 ◽  
Vol 853 ◽  
pp. 596-599
Author(s):  
Bo Wang ◽  
Yong Zhang ◽  
Hong Wei Liu
Keyword(s):  
Three Dimensional ◽  
Penetration Resistance ◽  
Surrounding Rock ◽  
Underground Engineering ◽  
Finite Element Program ◽  
Cutting Resistance ◽  
Dimensional Finite Element ◽  
Element Program ◽  
Three Dimensional Finite Element ◽  
Poor Stability

In view of serious degree of mouth formation rock weathering, poor stability, the construction excavation characteristics such as easy to collapse of underground engineering, incision reinforcement technology is used in underground engineering in the mouth period of construction, which changes the mechanical properties of surrounding rock and improves the penetration resistance of surrounding rock. Using three dimensional finite element program (ls-dyna) numerical simulations show that the stratified structure of the grouting tube in the surrounding rock is similar with covering layer thickness steel ball, which makes the projectile yaw in the process of penetration movement. As is shown through comprehensive calculation and analysis, the zero incision reinforcement technology can make the penetration resistance of the underground engineering mouth period increased by 30% ~ 40%.

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