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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 463 Documents
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INVESTIGATING THE LOW-INCOME SETTLEMENT IN AN URBANIZATION AND URBAN FORM A CONSEQUENCES OF BANGKOK GROWING CITY, THAILAND U. Shummadtayar; K. Hokao; P. Iamtrakul
Lowland Technology International Vol 15 No 1, June (2013)
Publisher : International Association of Lowland Technology

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Abstract

A rapid urbanization has resulted in more rush transformation of a settlement of low-income migration growth into an urban area. The growt squatter settlement role was influenced through an urban form conflict. Many of these points have been debated over the issue of sustainable urban development plan that has led the way into the urban building density appearance and the phenomenon of its urban area growth effects. The ultimate results depend on an increase in carbon emissions changed over time and its effect on climate change. The real challenged problems are being solved in the developing country, such as Thailand's capital Bangkok. Moreover, an unplanned and low-efficient development projects cause extensive devastating consequences to both urban environment and human beings. Particularly for the low-income people who live in a lowland area are more heavily buderned by environmental risks and unsafe area. Thus, it is imperative for this paper to discover a key issue of low-income migration and settlement on the basis of the measurements which includes: (a) the situation of urbanization driving process forces the low-income settlement growth, and (b) investigate the causes and effects on urbanization in terms of the urban environmental conditions and locations system (e.g. sensitivity analysis, risk approaches) using GIS-based Multi-Criteria Decision Analysis (MCA) for calculating the simplify situations of the alternative factors and using the Analytical Hierarchy Process (AHP) for weighting the measure of individual participant data. By this approach, it is becoming more feasible to be configured, with the Weighted Linear Combination (WLC) operators. This tool presents the usefulness of the relative important weights for relevant approaches of low-income settlement in consequences of growing cities based on geographic information system (GIS).
ECOLOGY, PRODUCTION AND LIVING: RESEARCH ON THE PLANNING AND CONSTRUCTION OF RURAL FEATURES BASED ON THE EPL SYSTEM C. C. Xu; Z. Y. Chai; Y. C. Gao
Lowland Technology International Vol 15 No 1, June (2013)
Publisher : International Association of Lowland Technology

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Abstract

Rural planning and construction carries influential natural, economic, social and cultular connotation. The problem of rural fetures deficiency has prevailed and construction process in Zhejiang Province in China, the article presented a way of recognizing different rural landscape styles, and put forward guiding ideas and spatial strategies for the planning and construction of rural features, from the perspective of ecological system, production system, and living system (namely "EPL" system). Such research might provide guidance for the current construction of Chinese rural features.
FOUNDATION ALTERNATIVES IN DREDGE FILL SOILS OVERLAYING ORGANIC CLAY M. S. Islam; M. Nasrin; A. J. Khan
Lowland Technology International Vol 15 No 2, Dec (2013)
Publisher : International Association of Lowland Technology

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Abstract

Dhaka city has experienced a rapid growth or urban population for the last 40 years. this high population increase demands rapid expansion are already eshausted. As such new areas are being reclaimed by both government and private agencies using dredge fill from nearby river sources. Sub-soil investigations have been carried out in different reclaimed areas within the city. It is found that top filling layer is non-plastic fine sand. Mean grain size of which varies from 0.15 to 0.20 mm. A very soft organic layer exists below the filling layer which is highly plastic and highly compressible. Field SPT N-value of filling layer and organic layer vary from 2 to 11 and 1 to 2, respectively. Attempts have been made to correlate unconfined compressive strenght with SPT N-value, plasticity index, and organic content. Attempts have also been made to correlate compression index with organic content and initial void ratio of the soft organic clay. The correlations of the soil properties with organic content are variable and in most of the cases no definite correlations could be established. It has been observed that filling sand overlaying organic layer will badly affects the foundation on or having in it. Foundation alternatives have been suggested for the reclaimed areas in Dhaka city.
3D COUPLED MECHANICAL AND HYDRAULIC MODELING OF THE COLUMN-SUPPORTED EMBANKMENT IN HIGHWAY WIDENING PROJECT J. H. Song; L. C. Miao
Lowland Technology International Vol 15 No 2, Dec (2013)
Publisher : International Association of Lowland Technology

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Abstract

Numerical studies were conducted to improved the understanding of the behavior of column-supported embankments in highway widening project. Due to the complexity of the problem, so far, consolidation process and three-dimensional patterns of columns have not been well simulated in most published numerical studies. As a result, the time-dependant behavior and the serviceability of this system have not been well evaluated. In this study, a three-dimensional coupled mechanical and hydraulic modeling was conducted using ABAQUS to consider consolidation and three-dimensional arrangement of columns. The numerical predictions are analyzed in terms of settlement and increments in vertical effective stresses. Firstly, the effectiveness of the use of columns and caps is studied. Afterwards, a parametric analysis is performed to study the influence on the soil-columns and caps system of the deformability and the effective friction angle of the embankment. At last some conclusions are obatined from the result of the numerical calculation.
PERFORMANCE OF VACUUM CONSOLIDATION IN A THICK CLAYEY DEPOSIT IN SHANGHAI Y. J. Wu; Y. C. Yuan; J. C. Chai
Lowland Technology International Vol 15 No 2, Dec (2013)
Publisher : International Association of Lowland Technology

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Abstract

A vacuum consolidation test was successfully carried out in a (more than 25 m) thick soft clayey deposit in Shanghai. At the site, there is a clayey silt layer located about 5.3 to 6.8 m depth with a relative higher hydraulic conductivity, and a cement deep mixing formed cut-off wall was able to prevent the vacuum leakage through this layer. Prefabricated vertical drains (PVDs) were installed with a spacing of 1.4 m and triangular pattern to a depth of 14 m. The measured results indicate that the degree of vacuum consolidation reached more that 90% in PVD improved zone for a period of about 38 days. Analysis results indicate that the vacuum pressure induced ground deformations can be calculated reasonably well by a previously proposed method. Further field monitoring results whow that one month after stopping the vacuum loading, 10 to 65% of the vacuum pressure induced lateral displacement was rebounded, and the percentage rebounding increased with the depth.
COUPLING INFLUENCES OF AQUIFER SPATIAL VARIABILITY AND WASTE COMPOSITIONS ON DISTRIBUTION AND RECOVERY OF DNPAL IN STATISTICALLY HOMOGENEOUS NONUNIFORM POROUS MEDIA A. Putthividhya; S. Rodphai
Lowland Technology International Vol 15 No 2, Dec (2013)
Publisher : International Association of Lowland Technology

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Abstract

PCE and TCE saturation distributions are generated with stochastic models to incorporate spatially varying aquifer properties. the influence of aquifer property correlation on fluid migration and entrapment is explored in cross-sectional 2D numerical two-phase saturated flow models extracted from 3D geostatistical realizatios generated from well-published aquifer data in a nonuniform sandy aquifer. An effort to model a mixture of DNAPL is exercised by employing five compounds DNAPL; a 6:1:1:1:1 by volume ratio of PCE ,toluene, 2-chlorotoluene, 1-bromohexane, and 1-bromoheptane. Comparisons of PCE, TCE, and DNAPL mixture suggest that the choices involving chemical waste compositions greatly influenced the saturation and distribution of DNPAL (i.e., pathways and organic spreading). The organic wastes released into the system can escape to the other 2D cross sections as the waste mixtures are more mobile compared to pure phase. Coupled application of stochastic model of aquifer spatial variablity as well as chemical waste compositions can significantly influence predicted DNAPL infiltration depth, entrapment, and recovery. The resultant distribution profiles of DNAPL mass within the source zone also have implications for DNAPL recovery and subsequent downstream mass fluxes in remediation operations.
TRAJECTORY MODELING OF MARINE OIL SPILLS: CASE STUDY OF LACH HUYEN PORT, VIETNAM D. Quang Tri; N. Cao Don; C. Yi Ching
Lowland Technology International Vol 15 No 2, Dec (2013)
Publisher : International Association of Lowland Technology

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Abstract

In 2011, an oil spill occurred off Lach Huyen port in the Northeast of Vietnam, due to vessels collision. the result of collision caused pollution on wide area and surrounding areas. This paper was used MIKE 21 SA model to simulate oil spill transport with five scenarios. The results of simulation showed that spill trajectory and slick arrea depend on analysis hydraulic regime, wind direction and wave in the study area. This paper presents the model application for simulating spill scenarios. It helps in selecting eco-sensitive regions for preparedness and planning suitable response strategies whenever spill incident occurred.
A QUANTIFICATION ANALYSIS OF SUBURB LAND USE AND CONSTRUCTION INTENSITY BASED ON AFAR: A CASE OF THE LAND DEVELOPMENT AROUND ZIJINGANG CAMPUS, ZHEJIANG UNIVERSITY J. R. Shi; X. M. Zhao; F. Zheng; K. Hokao; J. Ge
Lowland Technology International Vol 15 No 2, Dec (2013)
Publisher : International Association of Lowland Technology

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Abstract

China is facing an increasing urbanization in the edge area surrounding main metropolises. This paper targets at analyzing the construction mechanism of land use planning near suburban college towns. Theories and methods such as typical case analysis, mathematical model, and space capacity analysis were used to quantify the mechanism. A typical suburban block, Zijingang Campus Town of Zhejiang University was taken as the case. Since the key index (floor are ratio) indicates the construction intension of a patch of land, it is necessary to examine its appropiate range. The analysis result shows that there are differences in architectural prosperity and urban function by means of several designs. According to the guidelines of urban master planning and urban detailed plan, the Appropiate Floor Area Ratio (AFAR) calculated and deduced based on Economic Floor Area Ratio (EFAR) and Max/Min Floor Area Ratio (MFAR) can be useful in ratifying land development intensity, predicting future tend and evaluating city planning projects.
INHABITANT-ORIENTED ENVIRONMENTAL PREFERENCES AND LAYOUT STUDY OF SLAB HOUSE CLUSTERS IN "YANGTZE RIVER DELTA" AREA OF CHINA WITH MAS X. Y. Ding
Lowland Technology International Vol 15 No 2, Dec (2013)
Publisher : International Association of Lowland Technology

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Abstract

This paper has presented a design method of local inhabitant-oriented layout of slab house cluster including two main task: 1) analyzing inhabitants' preferences on environmental conditions in "Yangtze River Delta" Area in China through a household investigation; 2) simulating layout evaluated by the inhabitants' preferences. The investigation results showed: the local inhabitants have their own characteristics on environmental conditions, such as general preferences on layouts with dwelling units, roads, green land and individual preferences related with ages, sex, occupation etc. The simulation results showed the local design criterions, such as the most suitable height of house, the green land size and the conjunction way between dwelling units and their relations with the types of houses.
DESIGN CRITERIA OF SOIL-FIBER MIXTURES AS A MATERIAL FOR LANDFILL COVER BARRIER SYSTEM Tri Harianto
Lowland Technology International Vol 16 No 1, June (2014)
Publisher : International Association of Lowland Technology

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Abstract

The design criteria were introduced in this paper to design a landfill cover barrier layer using the compacted soil-fiber mixture for the future application (i.e. park, residential, etc.). Polypropylene (C3H6) fiber was used as an additive material for soil samples. The soil specimens compacted under the conditions of maximum dry density and optimum water content. In this study, the design objective in using the compacted soil-fiber mixture is to determine the range of fiber content (i.e. 0.0% - 1.2%) within which the soil specimens will have adequate compaction characteristics, compressive and tensile strength, minimum amount of cracking, and low hydraulic conductivity. It is found that the fiber content that maximized the maximum dry density was considered insignificant. Fiber content in excess of 0.8% showed significant increase in the unconfined compressive strength. The tensile strength significantly increased for soil specimens exceeding 0.2% of fiber content. An acceptable limiting value of the crack intensity factor to prevent desiccation cracking for soil specimen was found between 0.6 and 0.8% of fiber content. Moreover, the fiber contents up to 1.2% maintained the hydraulic conductivity within acceptable levels. As a result, the optimum fiber content that was necessary to meet the overall acceptable zones based on the parameter design investigated in this study was found and reported in this study.

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