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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 463 Documents
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PERFORMANCE OF DEEP EXCAVATED RETAINING WALL IN SHANGHAI SOFT DEPOSIT Z. H. Xu; W. D. Wang; J. H. Wang; S. L. Shen
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents a field case of deep excavated pit of a building foundation in soft deposit of Shanghai lowland area. The details of the project are described at first. Then, the design method and construction process are presented. The wall displacements, axial force of struts, and displacement of the steel lattice columns were monitoredand the results are presented and compared with the calculated results in design. Field measured data show that the ratio between the maximum lateral displacement and the excavated depth was controlled within 0.62%. Monitored data also show that the axial force in the second level struts was the largest among the three levels struts while the axial force in the first level strut was the smallest. The design method described in this paper is used to predict the diaphragm wall deformations. The prediction is consistent well with the measured data. However, there are some discrepancies of the axial forces in the struts between the calculated values and the measured values. Factors affecting effectiveness of the supporting system were investigated. The larger the thickness of the wall and the larger the stiffness of the struts, the smaller displacement of the wall will result. The rate of reduction of the wall displacement decreases with the increaseof the thickness of the wall and the stiffness of the struts. There exists a threshold value of the depth ratio of the diaphragm wall, which has a significant influence on the lateral displacement. In this field case the threshold value of depth ratio is 0.3.
INTERACTION BETWEEN RECREATION ACTIVITY AND PUBLIC PREFERENCE: A CASE STUDY ON PUBLIC PARKS IN SAGA CITY, JAPAN P. Iamtrakul; K. Teknomo; K. Hokao
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

Public parks are one of the representatives of urban environment that play an essential role to daily life of people and provide a variety of benefits and opportunities for community as green spaces. The lack of understanding of associations between pattern of park utilization and users’ preference has made difficulties to highlight the role of public parks in community while reflecting social needs of park users. To reflect actual preference of park users, Saga city in Japan was selected as a case study by employ an unconventional method to capture the real preference from actual target group of public park service. An indirect value of park users’ benefits estimation has been done through the determination of preference value factor, PVF in different users’ socioeconomic and recreation activity characteristics. The uniqueness of this method is to focus on the linkages between the availability of public parks and social preferences. On the basis of findings, the results pointed out that not only different satisfaction on park service induce on the differentiation of PVF value but the different willingness to pay on maintenance and management park service also result to demonstrates an different intuitive appreciation for environmental valuation based on park visitors’ preference.
RESEARCH ON THE FORMATION OF URBAN RESIDENTIAL LIFESTYLES THROUGH CASE STUDIES OF LOWLAND CITY SAGA AND NON－LOWLAND CITY KITAKYUSYU J. Ge; K. Hokao
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

In this paper, we firstly put forward the conception of residential lifestyles; and suitably questionnaire surveys were conducted in two cities of Japan- lowland city Saga and non-lowland city Kitakyusyu. Through the analysis of the questionnaire data, we got hold of the characteristics of residential preference patterns, residential emphasis on dwelling selection, as well as the evaluation on residential environment satisfaction. Furthermore, the comparison between the two cities helped to make clear the similarity and difference of the residential emphasis between lowland city and non-lowland city. The results of the research will not only be benefit to the understanding of the diversification of residential lifestyles, but also provide more information to the planning and developing of residential environment effectively and efficiently by understanding the residential preference, emphasis and demands of various patterns.
SORPTION CHARACTERISTICS OF THE SOFT BANGKOK CLAY L. Sthapit; C. S. P. Ojha; U. Glawe
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

Asian countries are in a need for identification of suitable sites for disposal of municipal solid wastes. The travel of pollutants is significantly influenced by the properties of the porous medium through which these travel. In Thailand, existing land disposal sites, which were initially selected in view of the low lying areas or the water bodies, are likely to last not for many years. In the light of this, it is essential that soils available in the region are tested and evaluated for their specific characteristics relevant to the safe disposal of solid wastes and planning of future landfill sites. Sorption characteristics are of special significance in the design of landfills. In this paper, the Bangkok clay has been evaluated for its sorption characteristics. Various adsorption isotherm models are tested and it has been observed that the Langmuir model performs best. The study indicates that the process of sorption is non-linear in nature and is sensitive to the type of influent characteristics.
ECOLOGICAL COMPENSATION IN URBAN DESIGN OF COASTAL LOWLAND CITY: LINCHENG NEW TOWN K. Wang; Z. Cao; L. Xu
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

The ecological problem of living environment should be explored to the city extension. Urban design is working at control on the physical form and environments of a town and managing its multi systems. Accordingly, it is with great necessity to emphasize the operation of ecological compensation through out the whole process of urban design. It is especially demanded in the coastal lowland cities in China, which are developing most quickly and breaking the balance of nature most seriously. This paper tries to study four dominating factors (landscape, water system, green space, buildings) of ecological control and compensation in urban design through a serious of urban design projects in Lincheng New Town with consideration of the ecological character of coastal cities.
STOCHASTIC CELLULAR MODEL FOR LOWLAND URBAN DEVELOPMENT K. Teknomo; G. P. Gerilla; K. Hokao
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

An urban growth model using stochastic cellular simulation was developed with motivation to understand the consequence of zone management policies in lowland cities. The model could integrate the growth, decline, spread, intensification, and protected areas of the urban growth into a single generalization of both the Eden and the p-models. Calibration strategy was demonstrated using historical aerial photographs of Saga city, Japan.
OPTIMISATION OF WATER MANAGEMENT IN URBAN POLDERS CASE STUDIES OF THE NETHERLANDS AND THAILAND P. Wandee; B. Schultz; T. Tingsanchali
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

Rainfall in the Netherlands has moderate intensities and is more or less evenly distributed over the year while in Thailand rainfall occurs at high intensities and predominantly in the rainy season. The aim of the water management system in an urban area in a polder is to provide good drainage and discharge out of the polder. This paper presents a mathematical model for the optimisation of the main components of the water management system in urban areas in polders in the Netherlands and in Thailand. The main components of the water management system in an urban area in a polder are cross-sections of the sewers, distances between the canals, percentages of open water, canal water levels below the surface and discharge capacity of the outfall structures or the pumping stations. In order to find optional values for these main components the software package OPOL has been further developed. This package takes into account the relevant hydrological processes, construction and operation and maintenance costs for the water management system and damages due to high groundwater tables, water on the street, or even inundation under influence of rainfall and water level fluctuations in the urban canals. Optimising such a system aims at determining the main components in such a way that the annual equivalent costs will be minimal. The results of a case study for an urban polder in the area of the Principal Water-board of Delfland, the Netherlands and of another one in Bangkok, Thailand are shown. It was found that the canal water level has the largest influence on damages in these urban polders.
ESTIMATING THE POTENTIAL FOR CONJUNCTIVE WATER MANAGEMENT IN COASTAL PLAINS N. Cao Don; H. Araki; N. T. Minh Hang; H. Yamanishi; K. Koga
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents the development and application of a conjunctive water management model for lowland catchments. The model incorporates a simulation model and a management model to simulate groundwater movement, ground consolidation and to search for the potential pumping amount of groundwater without violating physical and environmental constraints. The results reveal that groundwater levels in a coastal aquifer greatly vary in response to pumping. Consequently subsidence rapidly occurs throughout the area. The study also suggests that conjunctive water management can be used to improve water supply reliability, to reduce groundwater overdraft and land subsidence and to improve environmental conditions.
EFFECT OF THICKNESS OF OVERLAYING CLAY LAYER OF LOWLAND REGION ON SENSITIVITY OF LATERAL DEFLECTION OF LONG PILES EMBEDDED IN NONHOMOGENEOUS SOIL - PART I: THEORETICAL FORMULATION D. H. Hafez; B. B. Budkowska
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

The importance of sensitivity analysis of soil-structure interaction system is embodied in two facts, that is, the soil is a nature-made material that affects the system’s performance and the sensitivity theory constitutes an inherent part of the behavior of the system. Moreover, the access to the supporting system is limited. Therefore, it is essential to have a reliable basis for the assessment of how changes of the parameters of the system affect its performance. The paper presents the study of sensitivity of laterally loaded piles using the distributed parameter sensitivity method. Other available sensitivity methods are briefly described in the paper. The theoretical formulation of the sensitivity of the lateral head deflection of piles embedded in non-homogeneous soil to changes in the design parameters is derived. The non-homogeneous soil consists of soft clay overlying sand and the design parameters are those that define the pile and the adjacent clay and sand. The formulation resulted in obtaining sensitivity operators that can show along the pile length where and how the change of each parameter affects the change of lateral pile-head deflection. The formulation provides the basis for studying the effect of the thickness of the overlying clay on the sensitivity results.
DEFORMATION BEHAVIOR OF SHIRASU SOIL BY THE EXTENDED SUBLOADING SURFACE MODEL M. Hira; K. Hashiguchi; M. Ueno; T. Okayasu
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

This study is aimed at evaluation of the deformation behavior of Shirasu soil (volcanic sandy soil) for reclamation and embankment construction, using elastoplastic constitutive equation based on the subloading surface model with the rotational hardening. Test results for isotropic consolidation and monotonic/cyclic loading-unloading compression with several lateral stresses under the drained conditions for various initial void ratios are reported. Further, the simulation by the constitutive equation based on the extended subloading surface model is compared with the test results. High applicability of the constitutive equation for the prediction of mechanical behavior of Shirasu soil for a geo-material at the lowland in the southern Kyushu is verified by the comparison.

Page 15 of 47 | Total Record : 463

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