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Slope Stability Analysis Using Numerical Modelling
Ali Fawaz,
Elias Farah,
Fadi Hagechehade
Issue:
Volume 2, Issue 3, May 2014
Pages:
60-67
Received:
31 March 2014
Accepted:
10 April 2014
Published:
30 April 2014
Abstract: This paper aims to analyze slope stability based on the numerical simulation using Plaxis software. The mechanical parameters of soil layers constituting the slope are evaluated from laboratory results and numerical simulations of in-situ pressuremeter tests. The study of the slope consists to determine the failure surface and the corresponding safety factor. This coefficient is calculated taking into consideration the influence of factors that contribute slope instability and following the use of several methods of reinforcement to strengthen the slope.
Abstract: This paper aims to analyze slope stability based on the numerical simulation using Plaxis software. The mechanical parameters of soil layers constituting the slope are evaluated from laboratory results and numerical simulations of in-situ pressuremeter tests. The study of the slope consists to determine the failure surface and the corresponding saf...
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Estimation of Pre-Compression Parameters in the Acceleration of Consolidation Settlement
Yaw Adubofour Tuffour,
Mark Adom-Asamoah
Issue:
Volume 2, Issue 3, May 2014
Pages:
68-73
Received:
1 April 2014
Accepted:
28 April 2014
Published:
10 May 2014
Abstract: Pre-compression by preloading is used to accelerate the consolidation settlement of a site ahead of construction so that post-construction settlement would be minimal. The principal aim of the technique is to remove the primary consolidation settlement anticipated under the proposed load with or without partial compensation for secondary compression so that post-construction settlement would consist of a small re-compression and secondary compression. In this paper, the scope of pre-compression is expanded to include partial removal of primary consolidation as a possible settlement management option. Modifications and simplifications are introduced into parameter estimation for design to deal with pre-compressions intended to remove any degree of the primary consolidation and those that go beyond the primary consolidation stage. This provides foundation engineers the flexibility to evaluate different pre-compression load and duration options under different settlement regimes and their implications. A numerical example is used to demonstrate and verify the modifications.
Abstract: Pre-compression by preloading is used to accelerate the consolidation settlement of a site ahead of construction so that post-construction settlement would be minimal. The principal aim of the technique is to remove the primary consolidation settlement anticipated under the proposed load with or without partial compensation for secondary compressio...
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Characterization of the Layered Pavement by Modelling and Calibration of Resilient Modulus
Ahmed Ebrahim Abu El-Maaty Behiry
Issue:
Volume 2, Issue 3, May 2014
Pages:
74-86
Received:
11 April 2014
Accepted:
28 April 2014
Published:
10 May 2014
Abstract: Paving materials characterization in terms of resilient modulus (MR) has become crucial for pavement design and analysis. In fact, it is extremely difficult to measure MR in laboratory as well as in field. The main objective of this study is to achieve a basis for the performance based design specifications of flexible pavements in Egypt. Thus, a methodology of an experimentally program is presented to evaluate the deformation characteristics and develop a possible correlations between different characteristics of Egyptian pavement layers under various saturation degrees and compaction efforts. Calibration of the predicted models is investigated by using international correlations to substantiate their predictability and evaluate the feasibility of using one or more of those equations in predicting MR of Egyptian base, subbase or subgrade soil. The results show that the obtained base course model is close to the TRPL theoretical relationship while Georgia equation is suited for predicting MR of Egyptian subbase layer. For subgrade soil, the obtained equation should be used with caution. The predictive capability of the proposed models is proven for use in flexible pavement design in Egypt where CBR or modulus of subgrade reaction is expected to simplify the effort in determination of the MR.
Abstract: Paving materials characterization in terms of resilient modulus (MR) has become crucial for pavement design and analysis. In fact, it is extremely difficult to measure MR in laboratory as well as in field. The main objective of this study is to achieve a basis for the performance based design specifications of flexible pavements in Egypt. Thus, a m...
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Mobility Development through Public Transportation, the Case of Mexico City
José Antonio Valles Romero,
Cid Leana Morales,
Julio Márquez Rodriguez
Issue:
Volume 2, Issue 3, May 2014
Pages:
87-90
Received:
3 April 2014
Accepted:
8 May 2014
Published:
20 May 2014
Abstract: In this paper we intend to take the most useful elements of transporting goods and people in order to analyze, diagnose and optimize them, it aims to provide elements of analysis on the info we have identified as priorities diagnosis, the relationship shows direct correlation between population density and the number of trips taken by its inhabitants and consumer products, in addition to deviations due to the characteristics of such areas, many variables are taken to try to diagnose the way they are doing the main, as well as the diagnosis, this analysis is crucial in the design of a reorganization strategy that gives priority of transportation.
Abstract: In this paper we intend to take the most useful elements of transporting goods and people in order to analyze, diagnose and optimize them, it aims to provide elements of analysis on the info we have identified as priorities diagnosis, the relationship shows direct correlation between population density and the number of trips taken by its inhabitan...
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Estimating Rainfall Infiltration for Groundwater Recharge Using Infiltration Index Method: A Case Study in Rajshahi District, Bangladesh
Tofatun Jannat,
Anupam Chowdhury,
Mohammed Ziaur Rahaman,
Kazi Moinul Islam
Issue:
Volume 2, Issue 3, May 2014
Pages:
91-95
Received:
28 March 2014
Accepted:
8 May 2014
Published:
20 May 2014
Abstract: Infiltration rate in soil is a measure at which the soil is able to absorb rainfall. It replenishes the soil moisture deficiency and the excess moves downward by the force of gravity called deep seepage or percolation and builds up the groundwater table. The study was conducted in three large Upazilas under Rajshahi district from 2002 to 2013 to estimate the rainfall infiltration for groundwater recharge which are the pre-condition to meet the large demand of irrigation supplies that are the key to economic growth. Rainfall data was collected from Upazila Agriculture Office DAE, Rajshahi. The data were analyzed to show the rainfall variations, runoff, infiltration rate and percentage of infiltration from total rainfall for different years. In this paper, W-index method was used for better and quick assessment of rainfall infiltration in study areas. The result illustrate that the average annual rainfall Infiltration rate were found 80.61, 79.12 and 72.20 cm/year for Godagari, Paba and Puthia Upazila respectively and the average percentage of annual infiltration from total rainfall were found 58.3%, 58.76% and 58.80% for three study areas respectively.
Abstract: Infiltration rate in soil is a measure at which the soil is able to absorb rainfall. It replenishes the soil moisture deficiency and the excess moves downward by the force of gravity called deep seepage or percolation and builds up the groundwater table. The study was conducted in three large Upazilas under Rajshahi district from 2002 to 2013 to es...
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Development of Self Compacting Concrete with Various Mineral Admixtures
B. H. Venkataram Pai,
Maitreyee Nandy,
A. Krishnamoorthy,
Pradip Kumar Sarkar,
C. Pramukh Ganapathy,
Philip George
Issue:
Volume 2, Issue 3, May 2014
Pages:
96-101
Received:
24 April 2014
Accepted:
10 May 2014
Published:
30 May 2014
Abstract: Self- Compacting concrete (SCC) is a special type of concrete that is able to flow and compact under its own weight and can occupy all the spaces in the form without any vibration effect, and at the same time cohesive enough to be handled without bleeding or segregation. The required compaction properties are achieved by adding super-plasticizers and mineral admixtures such as fly ash, rice husk ash, silica fume, etc. The utilization of these treated industrial by-products as cement replacement will not only help to achieve an economical SCC mix, but it is envisaged that it may improve the microstructure and consequently the durability of concrete. This provides solution to disposal problems and other environmental pollution issues created by these otherwise waste products. This paper presents the results of an experimental study aimed at producing SCC mixes of M25 grade by using the Modified Nan Su method, incorporating five mineral admixtures, viz., Fly Ash, Blast Furnace Slag (GGBS), Silica Fumes, Rice Husk Ash, and Shell Lime powder as supplementary cementing materials. Also, this paper gives the comparison of these SCC mixes in terms of their properties like compressive, split tensile, and flexural strengths. The fresh concrete properties are also included in the study.
Abstract: Self- Compacting concrete (SCC) is a special type of concrete that is able to flow and compact under its own weight and can occupy all the spaces in the form without any vibration effect, and at the same time cohesive enough to be handled without bleeding or segregation. The required compaction properties are achieved by adding super-plasticizers a...
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Elastic Buckling of Steel Columns Under Axial Compression
Issue:
Volume 2, Issue 3, May 2014
Pages:
102-108
Received:
27 May 2014
Accepted:
12 June 2014
Published:
30 June 2014
Abstract: In the present study elastic buckling of steel columns with three different cross sections, i.e. square, rectangle and circle cross sections, and two different boundary conditions, i.e. fixed-free(F-F) and pinned-pinned (P-P) boundary conditions, under axial compression has been investigated. At first, the basic equations of the problem have been given. Then solutions are found and the effects of the boundary conditions, cross sections, slenderness ratios on the buckling loads of the steel columns have been discussed. For the solution of the problem not only numerical computations have been performed but also finite element modeling (FEM) has been employed. For the validation of the present study, the results of numerical computations have been compared with the results of FEM, and a very good agreement has been achieved.
Abstract: In the present study elastic buckling of steel columns with three different cross sections, i.e. square, rectangle and circle cross sections, and two different boundary conditions, i.e. fixed-free(F-F) and pinned-pinned (P-P) boundary conditions, under axial compression has been investigated. At first, the basic equations of the problem have been g...
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