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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 8 Documents
 1 
Search results for , issue "Vol 10 No 2, Dec (2008)" : 8 Documents clear
CHARACTERISTICS OF WATER QUALITY IN LAKE SHIKINAWA OF FUKUOKA, JAPAN N. V. Tuan; K. Mori; Y. Hirai
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Abstract

Water quality is one of the main characteristics of water storage reservoirs or lakes. A water quality profile, in both of spatial and temporal variations, plays a very important role in assessment and management of lake water quality. In order to understand the lake water quality parameters, some observation plans were carried out for Lake Shikinawa, in different climate conditions including summer, typhoon occurring time, end of autumn, and before spring. Results of the first observation, which were done in summer, are presented and discussed in this paper. Some important properties of water quality situation of Lake Shikinawa were obtained and analyzed. Measured data also gave a clear understanding of the relationship among water quality parameters, effects of climate condition and aquatic plant coverage on lake water quality distribution. Besides, periods predominated by activities of convection term and wind induction on water quality were cleared from analyzed data.
CUMULATIVE PLASTIC STRAIN AND THRESHOLD STRESS OF A QUASISATURATED COMPACTED SILTY CLAY J. T. Shahu; Yudhbir .; S. Hayashi
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Abstract

The knowledge of cumulative plastic strain and stability threshold of subgrade soil under cyclic loading is of prime importance in a proper design and maintenance planning of highway pavement structures and railway tracks. The soil beneath a pavement or a track usually exists under quasi-saturated conditions wherein the water voids in the soil remain continuous. Quasi-saturated specimens are essentially partially saturated at low confining pressures. However, with the increase in confining stresses, the air voids in the quasi-saturated specimens are dissolved into solution and the soil behaves like saturated material. Both monotonic and cyclic undrained triaxial tests have been carried out on quasi-saturated compacted specimens of a silty clay. The monotonic tests have been used to develop critical state soil mechanics framework for quasi-saturated behavior. The cyclic undrained behavior of quasi-saturated specimens has been then interpreted using this critical state framework. A generalized bilinear log-log model is proposed for the prediction of cumulative plastic strain with number of load cycles for fine-grained soils. Threshold stress is evaluated using both plastic strain development and pore pressure generation criteria. A generalized relationship between threshold stress ratio and plasticity index is proposed for a variety of soils at low and relatively high confining stresses.
GROUND IMPROVEMENT OF A COAL ASH STORAGE POND USING SAND COMPACTION PILES S. S. Lin; C. J. Chien; J. C. Liao
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Abstract

Effects of sand compaction piles on ground improvement of a coal ash pond and axial performance on four drilled shafts through improved coal ash layer at a power plant in southern Taiwan is studied in this paper. Effects of the sand compaction piles improvement is evaluated by comparing the SPT-N values before and after ground improvement. The load versus displacement relation at head, the axial force along the shaft, the t-z curves and/or the toe q-z curve, which are the main concerns of shaft load test results, are presented and discussed in the paper. Applicability of the β value used by O’Neill and Reese (1999) for estimating shaft skin friction resistance of soil with no cohesion through improved coal ash layer is evaluated by comparing to the test measured results.
NEW FINITE DEFORMATION MODEL FOR REINFORCED GRANULAR FILL OVER SUPER-SOFT RECLAIMED GROUND: I UNIFORMLY LOADED STRIP K. Ramu; M. R. Madhav; H. B. Poorooshasb
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Abstract

The presently available models for the analysis of reinforced foundation beds on soft ground are based on the infinitesimal deformation theory. A new model, which is extension and modification of Madhav & Poorooshasb (1988) model is proposed to estimate the settlement response of a uniformly loaded strip on reinforced granular fill laid over a super-soft reclaimed ground and to estimate the mobilized tension in the reinforcement considering the hyperbolic stress–displacement response of the super soft soil, hyperbolic shear stress–shear strain response of the granular fill and finite deformation theory. The proposed model also considers shear stresses mobilized on the top and the bottom surfaces of the geosynthetic layer and relates them to the respective normal stresses. Results indicate that the infinitesimal theory underpredicts the displacements compared to those from the finite deformation theory. Parametric studies carried out quantify the effects of each parameter on the settlements along the reinforced foundation bed and tension mobilized in the reinforcement and facilitates design of footings on reclaimed ground.
RESEARCH ON WATERSIDE URBAN OPEN SPACES IN RESIDENTIAL ENVIRONMENT OF LOWLAND CITY- A CASE STUDY OF SAGA J. Ge; M. Gong; Q. Ye; K. Hokao
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Abstract

In this research, waterside spaces of a lowland city were studied from the interactive aspect of physical conditions, users’ consciousness/behaviors, and waterside design. Firstly, using Saga City as a case study, the overall conditions of waterside spaces in the city and their physical properties were made clear through site surveys. Then, by Semantic Differential (SD) survey and analysis, three main image components of waterside spaces in urban open spaces and residential environment of lowland cities were found: natural view, environmental arrangement, and urban density. Next, through Cluster Analysis, five image types of waterside spaces and their characteristics were obtained. Furthermore, the behavior tendency of each type of waterside was also analyzed. Finally, on the basis of above surveys and analysis, environmental designs were performed in the five types of waterside, and a SD simulation was conducted to verify the effectiveness of the design. The effective reformation methods for different types of waterside spaces were discussed in order to improve the image of waterside and to activate users’ behaviors. The results of this research could be applied directly in the development and improvement of waterside spaces for practice.
SOIL REINFORCEMENT WITH COMBINATION ROOTS SYSTEM: A CASE STUDY OF VETIVER GRASS AND ACACIA MANGIUM WILLD P. Voottipruex; D. T. Bergado; W. Mairaeng; S. Chucheepsakul; C. Modmoltin
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Abstract

This paper focussed on the effect of combination root reinforcement system on soil slope stability. Consequently, an attempt was made to study the effect of Vetiver grass roots in combination with Acacia Mangium Willd roots on shear strength of soil. To assess the mechanisms of root anchorage and root reinforcement within two years growth period, the plants were pulled out to determine their pullout resistance as well as their penetration into the soil. In addition, large scale field direct shear tests were carried out on both rootless and root reinforced soil. A composite soil-root system was developed to evaluate the contribution of combination root reinforcement to shear strength. Subsequently, the results revealed that there are significant root reinforcement effects of 1.5 times increase by Vetiver grass and 3.0 times increase by Acacia tree in the soil shear strength root reinforcement in the slope stabilization scheme. Consequently, this paper proposed the critical zone and selected soil moisture content to calculate the strength increment of the combination root reinforcement soil system for successful slope stabilization.
STUDY ON ALGAL GROWTH IN ISAHAYA RESERVOIR P. Ittisukananth; K. Koga; N. Vongthanasunthorn
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Abstract

Isahaya reservoir was constructed at the innermost sea of Isahaya Bay, Japan, in 1997 for preventing natural disasters and developing water resources. Algal growth in this reservoir has been changed since the beginning of the Isahaya-Bay Sea Reclamation Project. As the result, the main purpose of this study is to investigate the effect of algae growth in the Isahaya reservoir using a water quality model. In mass balance equation of this model, several interactions among water quality parameters, namely chlorophyll-a (Chl-a), chemical oxygen demand (COD), suspended solid (SS), total nitrogen (TN), dissolved inorganic nitrogen (DIN), total phosphorus (TP), dissolved inorganic phosphorus (DIP) and chloride (Cl-), are incorporated. Sensitivity analysis reveals that nutrients in the Isahaya reservoir are contributed from land area, resuspension-release from mud bed, and coagulation-flocculation-precipitation by seawater. This study found that, before fiscal year 2000, lime (calcium hydroxide, Ca(OH)2) which is used for soil improvement was one of algal growth inhibition in the Isahaya reservoir. Since fiscal year 2000, diatom is the most dominant algal species in this reservoir.
ANALYSIS OF GROUNDWATER LEVEL FLUCTUATION IN A PLAIN AREA USING GENETIC ALGORITHMS AND AN ARTIFICIAL NEURAL NETWORK A. K. Affandi; K. Watanabe
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Abstract

This paper reports on a research study that investigated a robust artificial neural network (ANN) and linear combination enhanced by genetic algorithms (LC-GA) technique for analyzing groundwater level (GL) in a plain area of the Saitama prefecture in Japan. The back propagion algorithm is used in ANN model. The input sets were selected by employing an analytical technique, the cross-correlation of monthly GL. The major objective of this study was to develop a reliable groundwater level fluctuation analysis system by means of GL prediction, which have different fluctuation patterns in a plain area generating trend forecasts for the forthcoming GL monitoring and management. In general, the LC-GA model gives better prediction in testing period than the ANN model even though it has out range from training data. It was found that by inserting one time lag gives better prediction results for ANN and LC-GA models.

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