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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 6 No 1, June (2004)" : 8 Documents clear
LAND SUBSIDENCE DUE TO WITHDRAWAL OF DEEP-GROUNDWATER Shen S.-L; Tohno I; Nishgaki M.; Miura N.
Lowland Technology International Vol 6 No 1, June (2004)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents a case history of land subsidence due to withdrawal of groundwater from deep marine sediments at the mid-northern part of Boso Peninsula, Chiba, Japan. Since 1969, subsidence has been observed in a large area. The maximum accumulative subsidence in the past 33 years has been about 0.85 m. In order to obtain overall information, 3D FEM analysis was conducted to calculate the land subsidence resulting from extraction of deep-ground water. The calculation method is based on the theory of groundwater flow through saturated and unsaturated media. This in an uncoupled approach for consolidation analysis. The compressibility of ground is considered in the calculation. In the calculation, the behavior of hydraulic conductivity and the compressibility of reservoir rock (Plio-Pleistocene sediments) under high presure were determined by laboratory odometer test and take into consideration. The analytical results were compared with the field-observed data. The results showed that this approach simulated the field case fairly well.
SHEAR STRENGTH OF COMPACTED GREEN CLAY PHYSICO-CHEMICAL FACTORS M. Omar; A. Shanableh; A. Tahmaz
Lowland Technology International Vol 6 No 1, June (2004)
Publisher : International Association of Lowland Technology

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Abstract

Shear strength characteristics of Jordan’s green clay influenced by physico-chemical factors have been investigated. The investigation was carried out by subjecting soil to treatment by different cations namely, sodium, calcium, and potassium at three the pH-values (pH= 2.0, pH=7.0, pH= 12.0). Treated and untreated soils were tested at three different states on the compaction curve namely dry of optimum, optimum (= 12.5 kN/m³), and wet optimum. All specimens were tested for shear strength using unconsolidated undrained triaxial loading procedure. Test results indicated that shear strength of the natural soil was the highest in comparison with treated soils. In addition, K-treated soils showed the highest shear strength followed by the Ca-treated soil while, the Na-treated soil was the lowest in shear strength for all the states on the compaction curve except at the wet of optimum, where the Ca-treated soil was the highest in shear strength among all the treated soils. At pH=7.0 (Neutral state) the highest shear strength was recorded but as soils changed from acidic to basic shear, strength decreased accordingly.
A NEW METHOD FOR CALCULATION OF FUZZY RESPONSE SPECTRA OF EARTHQUAKE MOTION IN LOWLAND Ansari A.; Noorzad A.
Lowland Technology International Vol 6 No 1, June (2004)
Publisher : International Association of Lowland Technology

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Abstract

The characteristic parameters of a system which are involved in dynamic analysis of a structure i.e. mass, stiffness and damping in addition to the input excitation have got some kind of fuzziness and vagueness. This vagueness is due to imprecise determination of such paraemeters and the complexity of real dynamic systems which are common in lowlands. On the other hand, nonhomogenity in soil properties and complex topography of soil layers have a great influence on the response of the ground. As a result, the effect of uncertainty of these parameters on the ground response is very important. This kind of uncertainty is not like randomness and it is necessary to consider it with the help of Fuzzy mathematics. In this paper a new method for fuzzy dynamic analysis of systems is introduced. According to this model, by the means of the a prallel system, the problem of combination explosion, which is due to fuzziness of system parameters, is solved. Moreover, the results of a study on the influence of different parameters’ fuzziness on the response spectrum are presented and a comparison between results of fuzzy analysis and traditional sensitivity analysis is made. Meanwhile, the effects of such uncertainty on response spectra are described.
EARTH SEWING TECHNIQUE FOR THE PRESERVATION OF FANASAKO HISTORICAL KILN SITES X. J. Chai; S. Hayashi; Y. J. Du
Lowland Technology International Vol 6 No 1, June (2004)
Publisher : International Association of Lowland Technology

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Abstract

The Funasako historical klin sites, which are located in the northern part Kyushu Island in Japan, have been considered as public exhibition areas. This requires preservation of the kiln remains by reinforcement of the soil. Considering the complicated local topography, the reinforcement method that was proposed is a combination of chemical grouting and soil nailing, and is termed the Earth Sewing Technique (EST) in this paper. In order to prevent disturbance of the soil in the kiln remains, a drilling hole diameter for soil nailing of 7 mm with a tendon (bolt) that has a diameter of 3 mm was selected. Field full-scale pullout test at a model kiln site were carried out before applying the reinforcement technique to the real historical kiln sites. This paper presents the field pullout results and the results of a series of laboratory pullout test that were conducted to investigate the critical factors affecting the perfomance of the EST. Design parameters have been recommended based on rational interpretation of the field and laboratory pullout test results. The pullout strength-water content relationships were found to be very useful for understanding and evaluating the shear strength capacity of soil nailing in partially saturated cohesive soils.
SOIL IMPROVEMENT OF SOFT GROUND AROUND PILE FOUNDATION IN EARTHQUAKE-RESISTANT DESIGN T. Ohsutka; G Aramaki; K. Koga
Lowland Technology International Vol 6 No 1, June (2004)
Publisher : International Association of Lowland Technology

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Abstract

When a pile foundation structure is design in soft ground with Japanese road bridge design spesifications, there are many cases in which the cross section, the amount of steel reinforcement, and the number of piles are decided according to the displacement limiting value. In such soft ground, it is possible to expect that displacement magnitude of the base structure is suppressed by improving the soft ground around the piles. This study clarified that there was a depression effect by improving the peripheral grounf of piles, for both the displacement of the base structure and the bending moment in piles. The calculation was carried out variously, by change of improvement depth and improvement width around the pile. Additionally, the effect of soil improvement for nonliniear response of the bridge pier was also examined. In a series of calculations, a two-dimensional finite element analysis program (FLUSH) often used in earthquake-resistant design was used.
SUNDARBAN MANGROVE FOREST OF THE LOWLAND OF SOUTHWESTERN BANGLADESH AND ITS HYDROGEO-ENVIRONMENTAL ASPECTS M. Q. Hassan; K. R. Chowdhury
Lowland Technology International Vol 6 No 1, June (2004)
Publisher : International Association of Lowland Technology

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Abstract

The paper presents the Sundarban Mangrove Forest and its hydro-environmental aspects in particular. The Sundarban Forest is covered by numerous distributaries of the Ganges delta along the coastal belt of the Bay of Bengal of southwest lowland area. The lithological distribution of surface area is of Geological Quarternary Age.These are clay,mud, silt, medium to fine sand and small patches of shell fragments In the beach area. Brief investigation of channel/ stream / river waters which indicated that the pH values varied from 7.5 to 8.4 and the recorded electrical conductivity (EC) ranges from 7,920 to 19,400 us/cm, and others ionic concentrations are also found in higher condition. The Sundarban Mangrove Forest frequently become of severe cyclones, tidal fooding and storm surges. The present study can help in the future planning and development of the lowland area of the Sundarban Mangrove Forest.
DISCUSSION ON “GEOTECHNICAL HAZARDS IN BANGKOK – PRESENT & FUTURE”, BY S. SHIBUYA, S. B. TAMRAKAR AND W. MANAKUL, LOWLAND TECHNOLOGY INTERNATIONAL, 5(1), 95-104 A. S. Balasubramaniam; N. Phienwej; D. T. Bergado; Y. N. Oh
Lowland Technology International Vol 6 No 1, June (2004)
Publisher : International Association of Lowland Technology

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Abstract

The writers read with great interest the contribution on “Geotechnical Hazard in Bangkok – Present Future”. The writers had a long time interest in the subsidence of Bangkok since 1973 (see Piancharoen and Chuamthaisong, 1976; Piancharoen and Isarangula, 1974; Rammarong, 1974) or so.
AUTHORS’ REPLY ON “GEOTECHNICAL HAZARDS IN BANGKOK – PRESENT AND FUTURE” DISCUSSION Shibuya, S.; Tamrakar, S. B.; Manakul, W.
Lowland Technology International Vol 6 No 1, June (2004)
Publisher : International Association of Lowland Technology

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Abstract

The authors are very much delighted with informative discussion made by our ex-colleagues (and ex-teachers) at AIT. The paper aimed at drawing attention of many readers who may not be familiar with current and, possibly, future geo-hazards in Bangkok area, implying that the paper is a type of incomplete S-O-A report rather than original paper.

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