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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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Georisks during road tunneling in weathered quartz sand rock with faults under high-head of groundwater B. Yuan; Y.S. Xu; S.L. Shen; T. Hino
Lowland Technology International Vol 18 No 3, Dec (2016)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents an investigation of georisks during mining tunnel construction in weathered quartz sand rock with faults at Fuyang, which is located at the southwest of Hangzhou, Zhejiang Province, China. Fuyang is a hilly region, where volcanic and intrusive rock masses are irregularly distributed, with the extensive development of fault zones and joint fractures. The Park Road Tunnels in Fuyang City will pass through the mountain in the city center and will be excavated in the lightly to weakly weathered quartz sand rock. The rocks are mainly crushable and are affected by fault zones and joint fractures. The fault zones and joints have large cavities filled with loose fragments and rich of fissure water. The rocks are classified into three grades based on the design code for road tunnels in China. The strength of the rock gradually decreases under the softening effect of abundant fissure water during construction. It was found that water ingress occurred at the entrance and the exit of the tunnel, the faults, and the contact zone between the hard and soft rock. Landslides had also occurred at the entrance and the exit of the tunnel in this case study.
Behaviors of soil cement columns and stiffened soil cement column wall in shallow excavation I. Meepon; P. Voottipruex; P. Jamsawang
Lowland Technology International Vol 18 No 3, Dec (2016)
Publisher : International Association of Lowland Technology

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Abstract

This research aims to presents results of laboratory investigations on cement-admixed clay and full scale of soil cement column (SCC) walls and stiffened soil cement column (SSCC) walls of 60 cm in diameter and 8 m depth constructed in soft Bangkok clay in various forms. There are five types of wall namely, type A: three row of soil cement column, type B: two rows of soil cement column, type C: one row of cement column inserted with steel H-beam in each column, type D: one row of soil cement column alternately inserted with H-beam, and type E: one row of soil cement column without reinforcement. The shallow excavation was conducted step by step with depth increment 1 m to 5 meter. Immediately after excavation; it can be observed from inclinometer that the horizontal movement of all type of wall exhibited slightly different. However, one day after excavation; the type A wall exhibited minimum movement of 6.37 mm; follow by type B wall with movement of 15.76 mm, and type C wall with movement of 22.37 mm. The maximum movement was observed from type D wall with movement of 51.99 mm while the type E wall failed one day after excavation. Alternate H-shaped steel reinforcement in the soil cement wall resisted bending moment due to lateral earth pressure up to a certain excavation depth. Beyond this depth the bending moment decreased, and the horizontal movement of the wall exhibited rigid body translation mode. The SSCC wall resisted bending moment due to lateral earth pressure through the embedded H-shaped steel in the soil cement column. Strain values indicated that the horizontal force was transferred to the embedded steel. Horizontal movement at the pile cap increased as the horizontal force increased. The SSCC continuously resisted the horizontal force through the embedded H-shaped steel, and a linear relationship between horizontal load and horizontal displacement was observed.
Yobuko morning market in Saga Prefecture, Japan: Its character as sustainable and creative place A. Harisah; A.N Kakon; N. Mishima; T. Arima
Lowland Technology International Vol 18 No 3, Dec (2016)
Publisher : International Association of Lowland Technology

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Abstract

The intention of the research is to identify several characteristics of Yobuko Morning Market (YMM) and to seek the reason why the market is still survive until now so that we can describe the uniqueness of the market and the reason of the market is still survive even though there are many alternative shopping places from reality to cyber world in around it. The research used concept of sustainable, creative, and diverse places to analysis the YMM, and several research methods to collect the data: 1). questionnaire, 2) structured interview, 3) unstructured observation, and 4) secondary data. The result research described several characteristics inter alia: temporary setting with shop-house in the background and only could be found at 7.00-12.00 in every day, dominated old women sellers and consumers, dominated specific food either squid fresh foods or processed foods, specific selling system: fixed price and sometimes they add goods depend on the seller, etc. Besides those, they also prepare barbecue for consumers, and create new products from squids at the place for new identity, and also we found several indications of sustainable and creative place and vice versa.
Urban morphology and accessibility classification as supportive data for disaster mitigation in Chiang Mai, Thailand N. Srinurak; N. Mishima; A.N. Kakon
Lowland Technology International Vol 18 No 3, Dec (2016)
Publisher : International Association of Lowland Technology

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Abstract

In historic town, investigation on limitations of streets to provide countermeasure during an evacuation is recently in concern. This study objective is to classify labyrinth and narrowness of urban accessibility that comprise with its urban morphology. The study area is Chiang Mai’s historic town locate in northern of Thailand. To identify risk level of the street, egress point from buildings were surveyed and collected combine with street width as urban accessibility factors. Urban morphologyof street network identified using space syntax integrations analysis. Additionally, Egress point locations also analysed using kernel density mapping to revealed risk level as area type and finally compared with classified streets map created by Hierarchy Cluster Analysis. The result shows classification of streets;Substreets were subdivided into Priorities streets determined by its level of risk. Priorities streets revealed a risk of bottlenecks caused by narrowness and high egress points ratio. Classification map shows crucial supportive data to evacuate strategies in disaster mitigation of historic town characters.
Analysis on green technology system and LCA CO2 emission reduction of phase IIconstruction project of JDXG J. Lu; J.J. Wu; Y. Zhou
Lowland Technology International Vol 18 No 3, Dec (2016)
Publisher : International Association of Lowland Technology

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Abstract

With rapid socio-economic development and the fast progression of urbanization, at present, China has become the world's largest energy consumers and carbon dioxide emitters, whose environment and resource faces enormous threatens and challenges. It is imperative that effective measures be taken to solve this problem. Green building in China has surely got a favorable development momentum over recent years, Assessment standard for green building (GB/T 50378-2014) (China Academy of Building Research, 2014) has been widely used in the evaluation work of the green building. In this paper, the case phase Ⅱ construction project of JDXG (Lingping, Hangzhou, China) has been rated as two-star green building by the standard. This project used plenty of green technology in energy conservation, water conservation, raw material conservation, land conservation and environmental optimization of interior space, and optimized the architectural design, which is expected to achieve significant effects, moreover, the green technology such as solar water heating system, spray irrigation system in landscape and high-ratio of green space would make significant contributions to carbon dioxide emission reduction in its life-cycle.
Effectiveness of slurry wall for lead retention in contaminated soil C. Teerawattanasuk; P. Voottipruex
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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Abstract

This paper examines the hydraulic conductivity and strength properties of several bentonite�cement (BC) mixtures and to delineate the influence of the cementitious material content, bentonite, and curing time upon the strength and hydraulic conductivity of BC barrier materials. The two ratios of cementitious material to bentonite-water slurry used were 7.5%, and 15%. Samples were cured for a period of 7, 14 and 28 days at 100% humidity, after which samples of each mixture underwent permeability and unconfined compression testing. It can be seen that unconfined compressive strength (qu) of specimen increased as cement content increased due to the hydration products. However, the qu of specimen decreased as bentonite content increased due to high expansion. Specimens with high cement content form a low permeability material that keeps high lead contaminant in top and middle portion in the specimen. The results shows that qu increase as cement content and curing period increase while the permeability coefficient decrease as curing period and cement content increase. Moreover, the effectiveness of slurry wall for lead retention contaminated soil can be obtained by using the optimum bentonite-cement proportion of B10C15.
Trichloroethylene-alcohol-water solubility characteristics with implications for partitioning tracer tests at DNAPL contaminated sites A. Putthividhya; K. Manajit
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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Abstract

Dense nonaqueous phase liquids (DNAPLs) widely occurred at numerous subsurface sites can act as long-term sources of both vapor-phase and groundwater contamination. Successful remediation and effective risk assessment of DNAPLcontaminated sites is limited by current source zone characterization techniques and DNAPL unique behavior. A relatively new method of DNAPL-contaminated site characterization involved the use of partitioning tracers to provide estimates of the known amount of DNAPL. A new practical continuous flow system was developed in this work to explore the DNAPL’s partitioning tracer-water solubility characteristics under pure phase and selected cosolvents conditions which can be crucial for estimate retardation factors of various tracers with implications for partitioning tracer tests at DNAPL-contaminated sites. Trichloroethylene (TCE) was selected as a representative of DNAPL due to its unique properties and solvent effects. Bromide was employed as a non-partitioning tracer, while three alcohols (i.e., iso-propanol, methanol, and ethanol) effluents were determined as a function of time under pure solvent and 30% cosolvent additions. The three alcohols appeared to have been used successfully as a partitioning tracers for detection of potential DNAPL saturation. Moment analysis of breakthrough curves allowed TCE and alcohol mass recovery and retardation factor calculation, and therefore could further estimate apparent DNAPL saturation. Assuming that partitioning to TCE-DNAPL is the only mechanism for retention of alcohols in the system, flow rate and various alcohol fraction additions seemed to have no major influence on retardation factor estimation of partitioning tracers in the system.
Research on indicator system and carbon emissions of lowcarbon eco-city - A case study in Hangzhou, China J. Ge; M.Y. Lu; J. Lu; X.Y. Luo; Y. Zhu
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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Based on an extensive review of 31 international and domestic indicator systems, a system, which consists of 6 primary categories, 19 secondary categories, and 39 indicators is proposed for Transfer Science and Technical Park in Hangzhou city, covering sustainable development in environment, urban space and green building, transportation, energy and resource, governance and infrastructure, and economy aspects. Then all indicators are classified into three implementation stages (e.g. regional control indicators, park management indicators, and block control indicators) to ensure the fully accomplishment of low-carbon targets, which are always neglected by researchers, planners, governments and city managers. In the end, two scenarios are adopted, while the former is developing in traditional way and the latter is under the circumstance that all indicators are accomplished, to calculate the carbon reduction in order to quantitatively evaluate the effect of the indicator system. The results reveal that the policy makers should give the priority to indicators related to green buildings (e.g. ratio of green buildings), utilization of renewable energy, green transportation (e.g. mixed land use, green travel, green vehicles, etc.), greenery (green coverage ratio, multi-coat landscaping planting system etc.) while establishing policies and guidance towards a low-carbon eco-city.
Effects of surface geology and topography on the damage severity during the 2015 Nepal Gorkha earthquake K. Sharma; M. Subedi; R.R. Parajuli; B. Pokharel
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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An earthquake of moment magnitude (Mw) 7.8 struck Nepal at 06:11 UTC on April 25, 2015. A field reconnaissance was carried out immediately after the main shock. This paper presents the accelerograms and the geology of Nepal. The acceleration response spectra of the motions at the valley show a prominent amplification at the period of 5 sec. This paper describes the effects of local geology and topography on the damage severity during the earthquake. The damage patterns illustrate the strong influence of local geology conditions on the severity of the damage at many places, like soil amplification in Gongabu, Machhapokhari, Ramkot, Purano Naikap, areas along the major rivers in Kathmandu Valley with loose alluvium deposits, and ridge effects on the Swayambhu Nath hill and Chautara. The effect of low frequency amplification caused by the Kathmandu Valley basin is evident from the severe damage to well-designed tall buildings in Kathmandu. Severe damages including ground fissures and liquefactions were observed adjacent to basin edges around the Kathmandu Valley. It was concluded on the basis of the observation that local geology, rather than engineering features of structures, largely determined the severity of damage during the earthquake.
Geomorphic approach of controlling mass movements on Tama Koshi road in Central Nepal M.R. Dhital
Lowland Technology International Vol 18 No 4, March (2017)
Publisher : International Association of Lowland Technology

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The heavy monsoonal precipitation of 2012 in central Nepal triggered off or reactivated many mass movements on the Tama Koshi road. A site survey of unstable grounds was carried out to recommend short- and long-term control measures. The landslide control works were recommended mainly on the basis of detailed geomorphic mapping supplemented with some geotechnical investigation of soils, and most of these structures are working satisfactorily.

Page 29 of 47 | Total Record : 463

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