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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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Adaptation of Ohia Pozzolan on Cemented Lateritic Soil as Base Material Improvement K.C. Onyelowe
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

The effect of nanostructured Ohia naturally occurring pozzolan (kaolin clay) on the compressive strength of Umuntu Olokoro lateritic soil was investigated for use as base material improvement of south eastern roads. First, a preliminary exercise was conducted to determine the index, grading and consistency properties of the natural soil. The results show that the Umuntu Olokoro soil was an A-2-7 soil, according to AASHTO classification system and poorly graded (GP) on USCS classification. The soil also recorded a PI of 21.85%, which shows that the soil was highly plastic. The specific gravity of the soil was 2.67, OMC of 13%, Maximum Dry Density of 1.84 gm/cm3, California Bearing Ratio of 14%, Unconfined Compressive Strength of 194.26 kN/m2, 219.11 kN/m2 and 230.77 kN/m2 at 7, 14 and 28 days curing periods with material property of silty clayey sand and stiff material. Furthermore, the pozzolan additive was introduced in proportions of 3%, 6%, 9%, 12% and 15% by weight and the effect of the varying proportions studied. The results show that the introduction of the pozzolan improved the soil compressive strength, considerable and a maximum of 369.9 kN/m2 was achieved at 9% proportion of pozzolan at 28 days curing time. Having satisfied the material properties for use as a base material (200-400kN/m2), pozzolan is a very good admixture material in the stabilization of lateritic soils for use as a subbase material for pavement construction.
Combining Soil Nail and Vetiver Grass In A Slope Protection Project In Vietnam N. T. Nghia; L. G. Lam; T. Hino
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents a combination of soil nail and vetiver grass for slope protection in a project in center of Vietnam. The application of vetiver grass is considered as a green environmental solution for erosion surface control while soil nail with shotcrete is a traditional method for steep slope stabilization. The shotcrete surface of soil nail system will be replaced by vetiver grass for the combination of soil nail and vetiver grass. This is not only economic solution but also meets requirement for landscaping. This paper presents design and construction techniques and compares the construction cost with tradiional soil nail methods.
Perception evaluation of soundscape in a wetland community by spatial graphical representation: a case study of Hangzhou Xixi Wetland, China. J.R. Shi; Y. Yang; D.S. Wang; H. Liu; X.M. Zhao
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

The perception evaluation of soundscape in a wetland community is investigated based on spatial graphical representation and statistical theory. The data were analyzed by EXCEL and SPSS and they produced the zoning map of soundscape in a wetland park. XIXI Wetland,Hangzhou, China, was chosen as the case area. The perception evaluation of soundscape was conducted at ten aspects: elements, time, preference, integration, liveliness, boisterousness, pleasure, feature, nature and irritability. Meanwhile, the goal is to provide a favorite soundscape for tourists, and a visual map with graphic reference is drawn for soundscape design in the wetland community.
Research trends on land use changes during 1991–2015: A Bibliometric Analysis J. Zhang; B. Wang; X. Chen; X. Wu; D. Zhang
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

Land use changes, as a practical and advanced space exploration technology, offered a lot of valuable data about the earth surface for global analysis, detailed assessment, environmental monitoring, mapping, change detection, disaster management, and civil and military intelligence. To provide a better understanding of global trends in land use changes research over the past 25 years and offer an informed perspective on future research, a bibliometric analysis of published land use changes research was conducted to evaluate current research trends from various perspectives quantitatively and qualitatively for the period of 1991-2015 based on SCIE&SSCI databases. This study is concentrated on the analysis of scientific outputs, research directions, source journals, author performance and their contribution, the distribution of research countries/territories as well as institutions and their collaboration and temporal trends in keywords usage.
Potential failure of Soekarno Bridge Foundation Cause of Liquifaction F. J. Manopo; A.G.D. Warouw; J.R. Talumepa; C.J. Manoppo
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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Abstract

Earthquake occurring may trigger many secondary hazards. One of those hazards is liquefaction which is a phenomenon where part of soil loses it stiffness due to cyclic load. This paper evaluates the liquefaction potential of Ir. Soekarno Bridge located in Manado, Indonesia using its own soil properties acquired from standard penetration test (SPT). Using Simplified Seed & Idriss (1971) as the basis method, based on this method, if the safety factor value exceeds one, the soil has a liquefaction potential. Calculation were done using NovoLiq software with the peak ground acceleration (PGA) = 0.732 g and shallow water table. Analysis result by applying previous soil and earthquake parameters shows that there is a potential of liquefaction on the bridge’s foundation at the layer I ~ II (0 ~ 12m). Further analysis of the foundation stability against liquefaction using Pile Group GEO5 software shows there is increasing of horizontal displacement by 19.4 mm at service load, settlement increase by 0.7 mm at service load, and bearing capacity wearing off equal to 19008.45 kN. Based on analysis results, we conclude that the Ir. Soekarno Bridge have a potential of liquefaction during 7.5 Mw earthquake.
Debris Analysis in RDNK Site Serpong due to Bridge Blockage Simulations Using HEC-RAS Yuliastuti Yuliastuti
Lowland Technology International Vol 22 No 2 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i2, Septemb.661

Abstract

The objective of this paper is to investigate the debris analysis due to bridge blockage by observing the rising of surface water elevation on the designated bridge based on the HEC-RAS simulation module. Methodology used in this paper covers the preparation of RAS geometry, determination of hydrological parameters, and RAS mapping for the output. Bridge and debris modelling were performed using the floating-pier debris module. Simulation was performed under the unsteady flow simulations. Simulation result showed that there were 3 m of water level increase during the blockage scenario. Keywords: Floating debris, Bridge, HEC-RAS, Pier
Engineering Characteristics of Khon Kaen Loess as Construction Material Apichit Kampala
Lowland Technology International Vol 22 No 2 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i2, Septemb.665

Abstract

In Khon Kaen province, the northeast of Thailand, the soil layer consists mostly of silty sand and silty clay with fine soil grains. This soil is a wind-blown deposit into layers of soil and is named “Loess” or “Khon Kaen Loess”. Thus far, there has been a limited studies conducted on its engineering properties and the use of this soil is also limited. Accordingly, this research studied the improvement of the basic and engineering properties of this Loess with addition of clay. The results indicated that Loess can be classified as inactive -silty-sandy clay. The yield stress of Loess-clay decreased with the increasing amount of clay and was directly related to the compressive strength. The compression index and swelling index also decreased with increasing consistency index. The ratio of is significantly correlated with the coefficient of compressibility and permeability coefficient. Still, the effective cohesion of Loess is relatively low (approximately 20 kPa) and it will not change with the clay amount. The maximum of the effective internal friction angle is 25 degrees while the soaked bearing strength seems to decrease following the increasing amount of clay. Notably, the basic and engineering parameters of Khon Kaen loess are mutually connected via an experiential relationship whereas the predicted outcomes and the results from other studies are similar. The experiential equation from this research could be used to predict the engineering properties of silty soil or other types of low-swelling clay.
A comparative study of the methods for establishing a local sustainable building rating system Zhuoyao Wang; Zhu Wang; Zhenlan Qian
Lowland Technology International Vol 22 No 3 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i3, Dec.671

Abstract

Sustainable building rating systems (SBRSs) play an important role in promoting the development of sustainable buildings. As SBRSs need to adapt to the local context, many countries and regions have made efforts in recent years to establish their local SBRSs. However, there is no consensus on how to set up a local SBRS. The purpose of this paper is to identify the main steps in and methods for developing a local SBRS and to provide a reference for subsequent research on establishing such a rating system. Therefore, this paper reviews and compares the relevant literature on the regional development of SBRSs. Four main development stages are identified: the selection of indicators and categories, the establishment of a weighting system, conversion into the rating system, and verification and modification. Accordingly, the methods commonly included in the four stages are identified and discussed, and the applicability and limitations of the methods are determined through comparative analysis. Finally, this paper proposes the future research direction related to the establishment of a future SBRS.
VARIABILITY OF WATER TABLE ELEVATION AND FLOW RESPONSE OF TROPICAL PEATLAND CASE STUDY AT PULAU PADANG, RIAU PROVINCE OF INDONESIA Nilna Amal; Joko Sujono; Rachmad Jayadi; Koichiro Ohgushi
Lowland Technology International Vol 22 No 4 (2021): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i4.674

Abstract

Peatland is a type of soil characterized by high water content. Using peatlands for plantation is accompanied by the presence of a channel. It causes water table decreasing to a certain depth that will increase the risk of fire. This study aims to observe characteristics of water table level in order to reveal the peatlands hydrology transformation. The study is conducted in Pulau Padang, Riau Province of Indonesia, which is a drained peatland that has been developed for industrial crop cultivation. The land is managed by different two groups, which are maintained by the local community and by private companies. An analysis is carried out by using a balance of water budget in peatland. The results show that there are correlations between water management with the state of water table elevation, especially the presence of channels and their management. The decreases of water table in local community areas are higher than that in companies' land with variety in higher values. This phenomenon occurs because there are no canal blocks on the peatland, which is managed by the local community so that the rise and fall of the water surface occur naturally. Keywords: peatlands, water table depth, channelization, rainfall, direct runoff
Prediction of Uplift Capacity of Belled-type Pile with Shallow Foundation in Sandy Ground J-G. Kang; N. Yasufuku; R. Ishikura; A. Y. Purnama
Lowland Technology International Vol 21 No 2, Sep (2019)
Publisher : International Association of Lowland Technology

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Abstract

This paper describes a semi-empirical model for predicting the uplift resistance of a belled-type pile considering the relative density of the ground. The variable parameters were utilized in the model are the pile length, the diameter of pile tip, the diameter of pile, and the angle of internal friction in the ground. Moreover, the inclination angle of pile tip and the relative density of the ground, which are not studied in the previous researches, were considered. In this study, an experimental model was conducted with various conditions such as the relative density of the ground and the inclination angle of pile tip those are designated to determine the failure surface of the ground. Based on results, a new model which can be applied to the belled-type pile was proposed by improving the limit equilibrium equation in the previous models. In addition, to confirm the reliability of the newly proposed a model of limit equilibrium equation of the belled-type pile, the models which are presented in the previous studies were compared with the proposed model. Consequently, the proposed model in this study correspond the higher reliability in comparison with the previous models.

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