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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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BORED AND DRIVEN PILE TESTING IN BANGKOK SUB-SOILS A. S. Balasubramaniam; E. Y. N. Oh; N. Phienwej
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Abstract

As a necessity to support an increasing magnitude of loads from tall buildings and long span bridges, the piling practice in the Bangkok Plain has moved several phases from driven pre-cast reinforced and pre-stressed concrete piles of smaller cross sections to spun piles and large diameter bored piles. The Chao Phraya plain in which the Bangkok city is located is low-lying and consists of a broad basin filled with sedimentary soils which form alternate layers of clay, sand, and clay. The upper clay layer is soft and highly compressible followed by a stiff clay layer extending to about 20 m or so and then followed by a layer of sand. Driven piles are normally taken down to this upper sand layer. However when the demand for a higher capacity arise, these piles cannot be extended in length due to construction problems and as such bored piles are needed to be taken down to as deep as 50 to 60 m. Below the upper clay layer there are eight interconnected aquifers from which ground water is pumped from deep wells. Thus in the design of piled foundations aspects such as the negative skin friction due to pile driving as well as deep well pumping are also needed to be considered. Some of the experiences gained over a period of 30 years in the study of piled foundations in the Bangkok Plain are briefly presented in this paper.
ENVIRONMENTAL IMPACTS CAUSED BY PADDY FIELD MANAGEMENT V. V. N. Murty; N. Cao Don; H. Araki
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Abstract

Paddy fields occupy large areas and are an important component of the cropped areas in the Asian Region. In this study, the environmental impacts caused by paddy field management are investigated and studied. It is observed that paddy fields cause both beneficial and adverse effects on the environment. The beneficial effects consist of flood retardation, sediment retention and recharge to groundwater. Important adverse effects are contamination to water resources, effect on human health and methane emissions. Steps needed to mitigate the adverse effects from paddy fields are also considered. These include understanding the water balance components for efficient water management, provision of surface and subsurface drainage systems and recirculation of drainage water. Water quality aspects, which need to be considered while recirculation drainage water and final disposal of the drainage water, are also studied. While all aspects of water quality are important, in general water quality aspects, which need attention, appear to be the total nitrogen and pesticide residues. Further studies are needed to manage both these constituents of the drainage water.
DISCUSSION ON “COMPETITIVE SORPTION OF MULTIPLE COMPONENT HEAVY METALS FROM GOLD MINING LEACHATE ONTO LATERITE SOIL” LOWLAND TECHNOLOGY INTERNATIONAL, 10(1), 54-64 Z. Li; X. Tang
Lowland Technology International Vol 11 No 1, June (2009)
Publisher : International Association of Lowland Technology

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Abstract

After going through the paper written by A. Putthividhya published in Lowland Technology International 10(1) 54-64, we found that there are some points in the methodology and analysis of results necessary to be clarified. Whilst essentially the experimental approach was straightforward and sound, beyond this, however, the analysis and the interpretations drawn are far from satisfactory.
COMPARISON OF COMPRESSIBILTY CHARACTERISTICS OF BUSAN LEACHED AND UNLEACHED CLAYS Y. T. Kim; T. H. Do
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

It is well known that the settlement of soft deposit increases with leaching process due to bond weakness of soil skeleton. This paper investigated the effect of leaching on the compressibility of Busan clay. The leached clay samples were obtained from the leaching procedure in laboratory with fresh water on the cell chamber. The initial salinity of about 17g/l in soil specimen, which was taken from Hwajeon industrial complex area, decreased to about 3g/l for 25 days. Compressible characteristics of the Busan leached clay were evaluated using the constant rate of strain test (CRS test), in which two kinds of strain rate, sec /%10 3−= ε & and sec /%10 4−= ε & , were adopted. Mechanical characteristics and physical properties between natural clay and leached clay were compared on the samples with the same conditions except salinity. The experimental test results of CRS tests showed that the compressibility of Busan leached clay increased as its salinity decreased. However, the void ratio, liquid limit, preconsolidation pressure and hydraulic conductivity of the leached sample decreased than these of the unleached clay due to leaching.
CONSOLIDATION MECHANISM OF GROUND IMPROVED BY A COMBINED DJMPVD METHOD D. W. Zhang; S. Y. Liu; Y. J. Du; G. Y. Du
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

Dry Jet Mixed (DJM) and Prefabricated Vertical Drains (PVDs) were used in combination to enhance the performance of soft ground improvement in Huai-yan highway in China. To investigate the consolidation mechanism of ground improved by a combined DJM-PVD method, coupled two-dimensional mechanical and hydraulic numerical modeling was conducted in this study to analyze the well-instrumented ground improved by a combined DJM-PVD method in Huai-yan highway in China. The results indicate that the consolidation of the ground improved by a combined DJM-PVD method is accelerated by the drainage of PVDs, the stress concentration on DJM columns and the excess pore water pressure gradient resulting from the stress transfer between the surrounding soil and columns. It is observed that the high drainage capacity of PVDs accelerates the dissipation of the excess pore water pressure. The accelerated dissipation is explained as that upon the embankment loading, the stress concentration on the column occurs due to its higher stiffness than that of the surrounding soil, and thereby results in the reduction of the excess pore water pressure in the soil. The differential settlement develops between the soil and the column induces the transfer of stress between surrounding soil and column, which results in pore water pressure gradient in the surrounding soil and accelerates the consolidation.
ELASTO-PLASTIC ANALYSIS FOR DISPLACEMENTS OF GRANULAR PILE ANCHORS (GPA) IN NON-HOMOGENOUS GROUND B. Vidyaranya; M. R. Madhav; M. Kumar
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

Granular piles improve the behavior of the soil by increasing bearing capacity, accelerate consolidation, reduce settlements, and mitigate liquefaction related damages by reinforcement and densification effects. Granular piles can be made to resist pullout or uplift forces by placing an anchor at the base and attaching the same by a cable or rod to the footing to transfer the applied pullout forces to the bottom of the GP termed Granular Pile Anchor (GPA). The elasto-plastic response of GPA in non-homogenous ground is presented considering the shear stress at the interface to be limited to the undrained strength of the soil.
IDENTIFYING SEEPAGE IN DITCHES AND CANALS IN POLDERS IN THE NETHERLANDS BY DISTRIBUTED TEMPERATURE SENSING O. A. C. Hoes; W. M. J. Luxemburg; M. C. Westhof; N. C. van de Giesen; J. Selker
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

Seepage in ditches and canals, a common feature in polders in The Netherlands, is investigated making use of temperature sensing by fiber optic cable. By its high spatial and temporal resolution capabilities the technique reveals the complex ensemble of all effects that define the water temperature on the bottom of the watercourses in three polders where a 1300 m long cable was located. From the temperature signature the location of suspected seepage zones in the water courses can be determined more precisely. The study shows that the sensing of seepage through temperature is time dependent as the signature can temporarily fade and can be extremely localized. This shows the potential for the applied technique.
MODELLING THE EFFECT OF HUMAN ACTIVITIES ON THE NUTRIENT TRANSFER IN THE RED RIVER BASIN (VIETNAM): PRESENT SITUATION AND PROSPECTIVE SCENARIOS FOR THE NEXT 50 YEARS T. P. Q. Le; J. Garnier; G. Billen; S. Thery; T. T. Duong
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

The Red River (Vietnam and China), which covers a watershed area of 156451 km2 with a total population near 30 million inhabitants, is one of the two largest rivers in Vietnam. The backbone of this work consisted in implementing the Seneque/Riverstrahler software which was successfully applied for the first time to a tropical river system as the Red River for assessing the link between human activity in the watershed and water quality of this river system. The first application of this model to the Red River system is described and validated with the data acquired by the monthly surveys of water quality at the outlet of the 3 sub-basins and in the main branch of the Red River during the years 2003 and 2004. After being validated, the model is used to explore a variety of scenarios describing possible future changes, concerning the hydrological management, population increase and land use and agricultural practices in the Red River basin in the next 50 years. The results show a clear increase of the N/P ratios is predicted for the 2050 scenario with respect to the 2003 situation, along with a clear decrease of the Si/N ratios at the outlet of the Red River.
RESIDENTIAL ENVIRONMENT EVALUATION SYSTEM CONSIDERING ENVIRONMENTAL QUALITY AND ENVIRONMENTAL LOAD FOR SUSTAINABLE DEVELOPMENT OF RESIDENTIAL DISTRICT X.-Y. Luo; Yanyan .; J. Ge
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

Residential environment is one of the most important elements for quality of life, as well as the main support for the activities of economy, culture and society. On the other hand, the improvement of residential environment quality also has been increasing the consumption of energy and emission of pollution. In this paper, we established a systematic methodology for the evaluation of sustainable residential environment, considering both residential environmental quality (Q) and residential environmental load (L). The part of Q is constructed by safety, healthy, amenity, convenience and community of residential environment. The part of L is about the environmental impact of the lifecycle of the housing and community. We hope the results of our study can contribute to the sustainable development and improvement of urban residential environment for rapidly developing China.
SOIL / WATER COUPLED ANALYSIS FOR CONSTRUCTION MANAGEMENT OF HIGHWAY EMBANKMENTS ON SOFT CLAY T. Takeyama; T. Ishigaki; T. Mizuta; H. Ohta
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

In the limited budget of highway construction, it is necessary to carry out the construction management which systematically utilizes management resources. This paper presents the applicability of soil / water coupled FE analysis for use in construction management of highway embankment on soft clay. At the first stage of analysis, the computer simulations of existing highway embankments on soft marine clay are conducted to verify their predictability. The constitutive model used in the analysis is an elasto-viscoplastic model proposed by Sekiguchi and Ohta (1977). At the second stage, the simulations of construction sequences, as case studies, with slow to fast banking rates are trialed to find better alternatives. It is a main point of the proposal to perform a construction management by fully utilizing the result of simulations for checking the stability of the foundation during construction.

Page 20 of 47 | Total Record : 463

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