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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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Correlation Between Shear Wave Velocity and Liquefaction Resistance For Sandy Soils With A Shearing History Using Cyclic Tri-Axial Tests G. J. Liu; N. Yasufuku; R. Ishikura
Lowland Technology International Vol 21 No 2, Sep (2019)
Publisher : International Association of Lowland Technology

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Abstract

Abstrac
Effect of Polymer and Portland Cement on Strengthen Crushed Rock for Pavement Base S. Chaiyaput; D. T. Bergado; J. Ayawanna
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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The effect of concurrent use of liquid polymer and Portland cement as a reinforced material in crushed rock pavement base was investigated in this work. The strength of polymer-treated crushed rock (treated crushed rock) and ordinary crushed rock (untreated crushed rock) were characterized and compared. In strength analysis, the California bearing ratios (CBR) of untreated and treated crushed rock were determined under unsoaked and soaked conditions to simulate post-flood pavement damage. The unconfined compressive strength (UCS) was evaluated under unsoaked conditions for 2h, 1-day, 3-day, 7-day, and 28-day curing periods. The results showed that the CBR of untreated and treated crushed rock under soaked and unsoaked conditions were positively correlated with dry density. The CBR under the unsoaked condition of untreated crushed rock was identical to that of treated crushed rock. Meanwhile, under the soaked condition, the CBR of treated crushed rock was twice as higher than the untreated crushed rock. The swelling indices were 0% for both untreated and treated samples. The UCS of treated crushed rock showed positively correlation with the curing time. The use of liquid polymer and Portland cement, therefore, improved the strength of crushed rock pavement base in which effectively mitigate the post-flood pavement damage.
Prediction Formula For Unconfined Compressive Strength of Cement Treated Soft Soil During Full Age J. J. Yang; H. Liu; Q. Liu; M. R. Dong; M. Wang; R. Mi
Lowland Technology International Vol 21 No 3, Dec (2019)
Publisher : International Association of Lowland Technology

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Cement stabilization method is one of the ground improvement techniques and has been also used for the purpose of utilization of dredged clay or construction muck. The long-term strength of cement soil is influenced by many factors such as cement content, water content, curing age and soil properties. In this study, a new formula without fitting parameters, which was based on the functional relationship without fitting parameters between the unconfined compressive strength and the curing age which was proposed by Yang et al., was proposed for predicting the unconfined compressive strength of cement treated soil during full age, The results show that the formula can properly predict the strength growth of cement treated soil by comparing with the experimental data that was cited from the literatures.
Laboratory modelling of grouting in poorly-graded sand W.C. Cheng; J.C. Ni; S.L. Shen
Lowland Technology International Vol 20 No 4, March (2019): Special Issue on: Green Technology for Sustainable Infrastructure Develop
Publisher : International Association of Lowland Technology

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This paper presents a newly designed laboratory apparatus for grouting in poorly-graded sand. Sandy soil specimen was prepared by a wet-raining method. Bleeding tests were carried out to select a cement-bentonite mixture with minimal bleeding. Both water injection tests and grout injection tests were conducted to investigate the threshold seepage velocity, the fracture initiation pressure, and factors affecting the fracture initiation pressure using a plot of injection pressure (p) against injection rate (q). Under low q value, the development of p-q curve was not relevant to the overburden pressure applied and the p value was generally in a proportional linear relationship with the q value. It is also noted that for the same q value, the fracturing pressure required was increased with an increase in effective overburden pressure. Vertical oriented fractures were formed and then turned to a horizontal orientation. The subsequent turning of the fractures might be related either to the minimum compressive stress somehow being increased during the test or to the inhomogeneous nature of the sand specimen.
A case study on tail brush induced loads upon segmental lining S.K. Yadav; L. Han; G.L. Ye
Lowland Technology International Vol 20 No 4, March (2019): Special Issue on: Green Technology for Sustainable Infrastructure Develop
Publisher : International Association of Lowland Technology

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Damage to the tunnel segmental lining induced by the construction loads has become an important issue in recent years. In this study, in-situ monitoring was carried out to measure the pressure on the lining of a large cross-river shield tunnel along Yangtze River (diameter D=11.36m) with a small overburden (0.7D) in silty sandy ground. PAD type earth pressure gauges were used to measure the tail brush pressure on the lining. The time history and the distribution of pressures on the lining during tunnel construction were obtained. It showed that the tail brush pressure had a considerable effect on the segments while the shield machine was passing through. Non-uniform tail brush pressures caused cracking and water leakages in the reinforced concrete segments.
Investigation of the safety factor and reliability of the embankment in soil cement column improved ground on Saga lowland Y. Jabeur; S. Manandhar; S. Shrestha; T. Hino; M. Mbodji; T. Himeno
Lowland Technology International Vol 20 No 4, March (2019): Special Issue on: Green Technology for Sustainable Infrastructure Develop
Publisher : International Association of Lowland Technology

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Saga plain constitutes thick deposited soft marine clay which is susceptible for the construction of any civil engineering structures with reference to large and differential settlement problems in the area. This paper presents the case study of the Ariake sea coastal road project failure on Ashikari region in Saga lowland. In this region, the group of soil cement columns as ground improvement technique is adopted for the construction of the highway embankment. The estimation of probability of failure of the embankment on the stabilized soils is approached through the probabilistic analysis for this research. The assessments of total safety factor (Fs) and reliability rely on random variables of geotechnical parameters. These random variables considered for this study are the unit weights of the soil materials (γ) (fill and clay), the undrained shear strength (cu) in the embankment fill material and undrained shear strength of the stabilized soil and soft soil. Furthermore, the paper also delineates judgment of the geotechnical risk assessment based on real site condition.
Study on effects of specimen size of unconfined compressive strength of improved soil T. Himeno; K. Takatani; T. Hino; S. Mandhar; S. Shrestha
Lowland Technology International Vol 20 No 4, March (2019): Special Issue on: Green Technology for Sustainable Infrastructure Develop
Publisher : International Association of Lowland Technology

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Deep mixing method (DMM) is one of the countermeasures for long-term stability of the soft ground area, specifically highly applicable in coastal lowland. With the economic growth in ASEAN countries, this technology has become more popular in order to develop stable infrastructures through mega projects. In this paper, discussions are carried out through conducted laboratory mixing tests by where samples were extracted from the site in order to maintain the quality of soil-cement column by using DMM based on designed methodology. In Japan, samples are extracted continuously from the vertical direction using a thin-walled sampler. It can be connected from considering characteristics of strength development of each depth grouped into three sections from the tube into upper, middle and lower portions. However, the case of non-uniformity and the total amount of sample taken from the site is not enough, there will be the possibility to encounter a difficult situation to conduct laboratory mixing test using standard specimen size of D 50 mm × H 100 mm. Therefore, the characteristics of strengths appeared in the standard size of D 50 mm × H 100 mm laboratory mixing test is compared and discussed with newly defined laboratory test of specimen size D 25 mm × H 50 mm.
Developing concept on sponge city arrangement for flood hazard mitigation: A case study of Wuhan, China M.Y. Lin; S.L. Shen; W.C. Cheng
Lowland Technology International Vol 20 No 4, March (2019): Special Issue on: Green Technology for Sustainable Infrastructure Develop
Publisher : International Association of Lowland Technology

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As a frequently flooded city, Wuhan is one of the key cities that need to improve the abilities against flooding hazards. The recent rainstorms happened in Wuhan led to floods and threatened people’s lives as well as made huge economic losses so that it is urgent to develop an overall Sponge City System in Wuhan. This paper investigates the reasons that Wuhan frequently suffered from severe flooding hazards, including (1) flat topography, (2) heavy precipitation, (3) reduction of lake area, (4) decreased capacity of drainage system. By consideration of these conditions in Wuhan, specific methods based on Sponge City are recommended. According to overall consideration of waterlogging risk, flooding impacts and Sponge City effects, key regions that need to be given priority to develop Sponge City are proposed. Then, this paper proposes following Sponge City arrangement: (1) recovery of water ecosystem and water quality status in Wuhan is recommended. (2) Based on the existing gardens in urban area, adjustments of bio-retention or rain gardens including increasing the proportion of rain gardens in residential regions and along lakes are proposed. (3) GIS is used to analyze the topography, build rain flood model based on DEM and monitor the waterlogging in order to reduce flooding hazards and improve the ecological environment in Wuhan. By analysis and constructions of Sponge City in Wuhan, the harmful effects of flooding will be reduced and the ecological environment will be improved.
Hazards induced by anthropogenic activities, a lesson learned from recent underground construction works K. Elbaz; S.L. Shen; W.C. Cheng
Lowland Technology International Vol 20 No 4, March (2019): Special Issue on: Green Technology for Sustainable Infrastructure Develop
Publisher : International Association of Lowland Technology

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Due to the expansion of underground constructions in urban areas, numerous hazards caused by anthropogenic activities have occurred in recent years. These hazards cause catastrophic failures which could pose a danger to life and property. Therefore, it is important to investigate the required knowledge to prevent these hazards. Five anthropogenic hazards that occurred due to the underground construction works are discussed; in order to identify risks and mitigate their adverse impacts in the future projects. According to the field investigations, it was found that there were many reasons for the underground construction failures caused by anthropogenic activities such as: faults in design and implementations, grouting material, leakage water, erosion, soil deterioration, and inadequate ground improvement. The understanding of these cases provides a wealth of experience and guidance for future excavations works.
Analysis of appropriate overtaking position under equal block lengths O. Sangphong; S. Siridhara; V. Ratanavaraha
Lowland Technology International Vol 20 No 4, March (2019): Special Issue on: Green Technology for Sustainable Infrastructure Develop
Publisher : International Association of Lowland Technology

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This paper studies train passing operation and determine line capacity by checking minimum headway. The analysis is based on the blocking time model displayed on the time space diagram where minimum headway and minimum waiting time are calculated. The study found that the capacity is affected by the number of blocks and the overtaking block position. The graph between the overtaking position and capacity is symmetrical, in which capacity is reducing when the overtaking position is far from the center of the line. The overtaking position that maximizes capacity is not affected by speed nor block length. In the case of even number of blocks, the appropriate location to overtake is (n / 2) +1 while in case of odd number of blocks, the overtake position is at (n+1)/2 and (n+3)/2. Both positions maximize the line capacity for each case. In addition, when the block length was reduced the capacity increased and decrease dwell time.

Page 35 of 47 | Total Record : 463

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