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Evi Aprianti
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International Association of Lowland Technology In Collaboration with Hasanuddin University and Saga University Address Faculty of Engineering, Center of Technology Building, 1st Floor Jalan Poros Malino km. 6, Bontomarannu, Gowa Indonesia Postal Code: 91711
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Lowland Technology International
Published by International Association of Lowland Technology
ISSN : 13449656     EISSN : 21878870     DOI : https://doi.org/10.0001/ialt_lti
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Transportation
The Lowland Technology International Journal presents activity and research developments in Geotechnical Engineering, Water Resources Engineering, Structural Engineering, Transportation Engineering, Urban Planning, Coastal Engineering, Disaster Prevention and Mitigation Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 5 Documents
 1 
Search results for , issue "Vol 8 No 2, Dec (2006)" : 5 Documents clear
EFFECTIVE DEPTH OF VACUUM PRELOADING J. Chu; S. W. Yan
Lowland Technology International Vol 8 No 2, Dec (2006)
Publisher : International Association of Lowland Technology

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Abstract

Vacuum preloading is one of the methods that can be used to improve the engineering properties of soft clay. However, there is a misconception that the vacuum preloading method is only effective for soil within a depth of 10 m, as the maximum depth for water lifting using vacuum is 10 m. In this paper, the mechanisms of water lifting and vacuum preloading are examined and the differences between the two processes are explained. A simple physical model is used to demonstrate that the effective depth of vacuum preloading is not related to the maximum depth for water lifting. Two case studies are also presented to illustrate that in practice the vacuum preloading method can be used effectively for soil as deep as 20 m.
EFFECT OF THICKNESS OF OVERLAYING CLAY LAYER OF LOWLAND REGION ON SENSITIVITY OF LATERAL DEFLECTION OF LONG PILES EMBEDDED IN NON-HOMOGENEOUS SOIL – PART IIA: NUMERICAL STUDY OF SAND PARAMETERS D. H. Hafez; B. B. Budkowska
Lowland Technology International Vol 8 No 2, Dec (2006)
Publisher : International Association of Lowland Technology

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Abstract

This part of the paper is a direct continuation of our first part paper. The first part of the paper presented the theoretical formulation of the sensitivity of the lateral head deflection of piles embedded in non-homogeneous soil consisting of clay overlying sand to changes in the design parameters. The current paper presents numerical sensitivity studies based on this theoretical formulation. The effect of variation in sand parameters on the variation of the lateral head deflection which is an important serviceability measure is studied. Both the clay and pile parameters will be investigated in part IIB of the paper. In lowland areas, the soil profiles starting from the soil surface contain soft clay layer of variable thickness. The effect of the thickness of the overlying clay layer on the sensitivity results is explored through comparative sensitivity assessment. Sensitivity results are given in the form of graphical presentations of sensitivity operators which show along the pile length where and how the change of each design parameter can affect the change of lateral pile-head deflection. It is shown that the thickness of the overlying clay has an effect on changing the magnitude and location of the maximum values of the sensitivity operators.
EFFECT OF THICKNESS OF OVERLAYING CLAY LAYER OF LOWLAND REGION ON SENSITIVITY OF LATERAL DEFLECTION OF LONG PILES EMBEDDED IN NONHOMOGENEOUS SOIL – PART IIB: NUMERICAL STUDY OF CLAY AND PILE PARAMETERS D. H. Hafez; B. B. Budkowska
Lowland Technology International Vol 8 No 2, Dec (2006)
Publisher : International Association of Lowland Technology

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Abstract

This part of the paper is a direct continuation of part I and part IIA of the paper. The first part of the paper presented the theoretical formulation of the sensitivity of the lateral head deflection of piles embedded in nonhomogeneous soil consisting of clay overlying sand to changes in the design parameters. Parts IIA and IIB cover the numerical sensitivity studies based on this theoretical formulation. Part IIA studied the effect of variation in sand parameters on the variation of the lateral pile-head deflection. This part (part IIB) presents the sensitivity of the lateral pile-head deflection to variations in the clay and pile parameters. The numerical sensitivity results are graphically plotted along the pile length. The effect of the thickness of the overlying clay layer on these sensitivity results is investigated. This effect of non-homogeneity of soil is of significant importance to areas in which the overlaying clay layer has variable thicknesses such as in lowland areas.
EFFECTS OF THE OPERATION OF CHAO PHRAYA DAM UPON THE UPSTREAM FLOOD HYDRAULICS S. Visutimeteegorn; K. Likitdecharote; S. Vongvisessomjai
Lowland Technology International Vol 8 No 2, Dec (2006)
Publisher : International Association of Lowland Technology

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Abstract

During flood periods, the operation of Chao Phraya Dam to control downstream water discharge causes flood inundation in upstream area, especially the water diversion in the irrigation areas. The purposes of this research are to study the effects of the operation of Chao Phraya Dam upon the upstream flood hydraulics and to study the harmony of the operation of Chao Phraya Dam, the regulators and the upstream reservoirs to model the flood situation with a hydrodynamic model and simulation techniques in flood inundation areas and for gate operation. The results shows that Manning’s n in the Chao Phraya River and its tributaries are 0.030 - 0.035 in the main channels and 0.050 – 0.070 in the flood plain areas. The backwater due to the operation of Chao Praya dam affects as far as 110 kilometers upstream. New methods of water diversion can mitigate the flood inundation and have no effect to the floating rice’s fields. The construction of the reservoirs in the Upper Sakaekang River Basin and the Upper Yom River Basin will mitigate the flood not only in their own basins but also in the Lower Chao Phraya River Basin. The operation of Chao Phraya Dam, the regulators and the upper reservoirs consistently will mitigate the flood inundation efficiently.
IDENTIFYING PUBLIC PREFERENCES FOR THE VALUE OF DAILY USED OPEN SPACES USING THE ANALYTIC HIERARCHY PROCESS – A CASE STUDY OF HANGZHOU CITY, CHINA J. R. Shi; X. M. Zhao; J. Ge; K. Hokao; Z. Wang
Lowland Technology International Vol 8 No 2, Dec (2006)
Publisher : International Association of Lowland Technology

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Abstract

Although much research exists on whether public open spaces are satisfactory with respect to users‘ perception, designers often neglect residents‘ preferences before a project is to be authorized. Especially when they design daily used open spaces that are located near or inside residential areas, the value of spatial environments is not paid enough attention to. This study applies the Analytic Hierarchy Process (AHP) to a field survey in order to compare the residents‘ perspectives concerning three general attributes (functional, aesthetic and ecological) and ten specific qualities of daily used open spaces. AHP is a methodology that assists respondents to make subtle trade-offs in unquantifiable attributes by means of measuring the relative preference of one attribute over another. Although this methodology is entirely different from other choice-based methods considering the cost-efficiency, the results of AHP offer a systematic method to examine the demands of those unheeded people. The results of the AHP application into data collected from the Chinese residents find that public preferences for daily used open spaces are stronger for the functional attribute, rather than the aesthetic attribute in the ancient Chinese tradition. Furthermore, comparisons of ten specific qualities show that the public prefers the open spaces that can be utilized conveniently and easily for group activities, because such spaces keep an active lifestyle of neighborhood communication, which also is seen to protect human-regarding residential environments.

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