scholarly journals A STUDY ON BEHAVIOR OF TUNNEL IN SOFT SOIL CONDITIONS UNDER INFLUENCE OF EARTHQUAKES IN HO CHI MINH CITY

2020 ◽  
Vol 30 (06) ◽  
Author(s):  
NGUYEN QUANG DUNG ◽  
LE BAO QUOC ◽  
NGUYEN DUC TAM
Keyword(s):  
Economic Development ◽  
Traffic Congestion ◽  
Ground Deformation ◽  
Soft Soil ◽  
Ho Chi Minh City ◽  
Soil Conditions ◽  
Deformation Method ◽  
Diagram Method ◽  
Complex Issue

Due to economic development and traffic congestion constraints, HCM City has implemented urban railways since 2007 and is currently constructing the underground metro line No 01. So far, general constructions and tunnel in particular in Vietnam is a complex issue, especially in the specific soft soil conditions of Ho Chi Minh City. In order to study the behavior of the tunnel during the earthquake, this paper compares an Imposed Seismic Ground Deformation method (ISGD) and the acceleration diagram method in calculating the tunnel affected by the earthquake in soft soil of the area of Ho Chi Minh city.

scholarly journals Pengaruh Kurva Histeresis Terhadap Model Stabilitas Lereng Timbunan Akibat Kegiatan Pertambangan Di Zona Lahan Basah

2017 ◽  
Author(s):  
Reza Adhi Fajar ◽  
Lilik Eko Widodo ◽  
Gunawan Handayani ◽  
Tedy Agung Cahyadi
Keyword(s):  
Vadose Zone ◽  
Water Saturation ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Soft Soil ◽  
Hysteresis Curve ◽  
Soil Conditions ◽  
Residual Soil ◽  
Complex Issue ◽  
Additional Reference

Landfill of residual soil due to mining activity in the wetland area is a relatively complex issue due to the soft soil conditions that are vulnerable to landslides. The stabilization method to increase the safety factor from landslide hazard can be done by decreasing the degree of water saturation in the soil disposal. In this case, the dominant mechanical parameters used in slope stability analysis will be elaborated with the SWCC concept for soft soil. While the conceptual model is built, it is based on the phenomenon of negative pore water pressure that appears in the vadose zone on the groundwater surface. The information provided from the hysteresis curve configuration can be used as an additional reference for the optimistic disaster analysis

scholarly journals Checking the site categorization criteria and amplification factors of the 2021 draft of Eurocode 8 Part 1–1

2021 ◽  
Author(s):  
Roberto Paolucci ◽  
Mauro Aimar ◽  
Andrea Ciancimino ◽  
Marco Dotti ◽  
Sebastiano Foti ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Shear Wave ◽  
Ground Motion ◽  
Shear Wave Velocity ◽  
Soft Soil ◽  
Site Amplification ◽  
Soil Conditions ◽  
Eurocode 8 ◽  
Site Specific ◽  
Amplification Factors

AbstractIn this paper the site categorization criteria and the corresponding site amplification factors proposed in the 2021 draft of Part 1 of Eurocode 8 (2021-draft, CEN/TC250/SC8 Working Draft N1017) are first introduced and compared with the current version of Eurocode 8, as well as with site amplification factors from recent empirical ground motion prediction equations. Afterwards, these values are checked by two approaches. First, a wide dataset of strong motion records is built, where recording stations are classified according to 2021-draft, and the spectral amplifications are empirically estimated computing the site-to-site residuals from regional and global ground motion models for reference rock conditions. Second, a comprehensive parametric numerical study of one-dimensional (1D) site amplification is carried out, based on randomly generated shear-wave velocity profiles, classified according to the new criteria. A reasonably good agreement is found by both approaches. The most relevant discrepancies occur for the shallow soft soil conditions (soil category E) that, owing to the complex interaction of shear wave velocity, soil deposit thickness and frequency range of the excitation, show the largest scatter both in terms of records and of 1D numerical simulations. Furthermore, 1D numerical simulations for soft soil conditions tend to provide lower site amplification factors than 2021-draft, as well as lower than the corresponding site-to-site residuals from records, because of higher impact of non-linear (NL) site effects in the simulations. A site-specific study on NL effects at three KiK-net stations with a significantly large amount of high-intensity recorded ground motions gives support to the 2021-draft NL reduction factors, although the very limited number of recording stations allowing such analysis prevents deriving more general implications. In the presence of such controversial arguments, it is reasonable that a standard should adopt a prudent solution, with a limited reduction of the site amplification factors to account for NL soil response, while leaving the possibility to carry out site-specific estimations of such factors when sufficient information is available to model the ground strain dependency of local soil properties.

Wastewater-fed aquaculture systems in Ho Chi Minh city, Vietnam: status and trends.

2020 ◽  
Author(s):  
Pham Viet Huy Huynh
Keyword(s):  
Economic Development ◽  
Inner City ◽  
Seed Production ◽  
Ho Chi Minh City ◽  
Nutrient Source ◽  
Water Spinach ◽  
Status And Trends ◽  
Rice Fish ◽  
The City

Abstract There are currently eight types of wastewater-fed aquaculture (WFA) systems in Ho Chi Minh City: seed production, fish-livestock, fish-water mimosa, fish-lotus, rice-fish, fish-only, water spinach, and fish-water spinach. Some utilize wastewater efficiently as a nutrient source, while some others have to control carefully the intake of wastewater. WFA has attracted farmers on their own initiative. Although it provides a living for a significant number of urban farmers and plays important roles in farmers' livelihoods, it is now under threat from the process of economic development of the city. The impacts of urbanization on former WFA sites in inner city zone of district 6 and district 8 where it is disappearing rapidly indicate what is likely to happen to current WFA sites in the city. Urbanization has also created livelihood uncertainties for farmers. The attraction of high prices of land and the impacts of urbanization projects are the main constraints, resulting in the decline in WFA areas. Pollution from uncontrolled and dispersed industrialization is another threat for WFA.

scholarly journals HO CHI MINH CITY ECONOMY IN RELATION TO THE VIETNAMESE ECONOMY AND FACTORS AFFECTING HO CHI MINH CITY ECONOMIC GROWTH

2014 ◽  
Vol 17 (3) ◽  
pp. 26-44
Author(s):  
Canh Nguyen Thi ◽  
Tuan Nguyen Quoc
Keyword(s):  
Economic Growth ◽  
Economic Development ◽  
Secondary Data ◽  
Poverty Rate ◽  
Ho Chi Minh City ◽  
Small Contribution ◽  
Factors Affecting ◽  
Development Indicators ◽  
National Budget ◽  
Country Factors

This research paper is focused on analyzing situation of economic development in Ho Chi Minh City after nearly 30 years implementing economic reform policies in Vietnam to specify the position and role of Ho Chi Minh City economy in comparison with the whole nation’s. In this research, we applied qualitative method with data description and economic development indicators comparison. Data are secondary data which were obtained from Statistic Yearbooks of Vietnam and Ho Chi Minh City in periods 1990/2000/2005-2013. Results indicate that the Ho Chi Minh City economy remains the Vietnam’s largest which accounts for more than 20% GDP and a third of the national budget. The annual economic growth and average income per capita are 2-3% and two times higher than those of Vietnam respectively. The poverty rate is also the lowest in the country. Factors that positively affect the Ho Chi Minh City economic growth are capital and labor as reflected by higher productivity and efficiency (specifically Ho Chi Minh City’s ICOR is 1.5-1.78 times lower than Vietnam’s and laborproductivity is two times higher than that of Vietnam) and the greater contribution of the capital and labor factors to the economic growth. However, there are signals that Ho Chi Minh City economic growth is unsustainable, including (1) slower export volume and FDI; (2) reduced weight of industry sector, especially the slow growth of key high-technology disciplines; (3) the downgrading of the urban environment quality which reduces the green GDP growth; and (4) the gradual decrease of the total factor productivity (TFP) and its very small contribution to the Ho Chi Minh City economic growth. Based on the results, this paper suggests some solutions to a sustainable development for Ho Chi Minh City in the next period.

scholarly journals Policy on Reducing Child Labor as the Elimination of the Worst Forms of Child Labor

2020 ◽  
Vol 6 (1) ◽  
pp. 1-20
Author(s):  
Errika Putri Anggriani
Keyword(s):  
Economic Development ◽  
Child Labor ◽  
Additional Data ◽  
School Age ◽  
Government Service ◽  
Complex Issue ◽  
The Family ◽  
Scholarship Program ◽  
Three Stages ◽  
The Government

The more complex issue of child labor now a days because many children work at school age. Child labor vulnerable to be exploitated, doing hazardous work, mor a land psychological, and hampered to access education. So the government issued a policy Reduction of Child Labour in order to Support the Family Hope Program (PPA-PKH) as efforts to Elimination of the Worst Forms of Child (PBPTA) in order for the child can be returned in the educational unit, Pemalang is one of the districts that run the program PPA -PKH. Problems examined: (1) Implementation of PPA-PKH asefforts of PBPTA in Pemalang (2) Obstacles and over coming obstacles in the implementation of PPA-PKH policiesas PBPTA efforts in Pemalang. This study using sociological juridical approach. Results of the study (1) Implementation of policies PPA-PKH in Pemalang has been run in accordance with the purpose, with the establishment of shelters through three stages: pre shelter, the implementation in the shelter, and after the implementation form shelter and get a recommendation schools (2) Efforts to overcome the obstacles in the implementation of PPA -PKH policies in Pemalang which includes the beneficiaries of data was only 10% valid so that need to perform additional data. Inability of companionon the shelter so tha this attemptstomake psycologis approachand change the way of learning. Lack of coordination between relevant government service to coordinate their efforts and commitment among relevant government service and proposing a scholarship program for the children of beneficiaries. The advice given by the researchers that the data of beneficiaries must be renewed every year, provide socialiszation that bring about beneficiary families about the importance of education impact economic development of families, increased coordination between relevant government service, there is certainly that the child gets a scholarship or BSM for education.

Consolidation Properties of Ho Chi Minh City Soil, Vietnam

2020 ◽  
Vol 54 (1A) ◽  
pp. 1-10
Author(s):  
Vo Nhat Luan
Keyword(s):  
Void Ratio ◽  
Soft Soil ◽  
Liquid Limit ◽  
Ho Chi Minh City ◽  
Compression Index ◽  
Underground Structures ◽  
Compression Pressure ◽  
Coefficient Of Consolidation ◽  
Two Samples ◽  
Index Changes

This paper presents the experimental results of consolidation properties of soft soil in Ho Chi Minh City of Vietnam. Forty-two samples were collected from different locations and were determined in the laboratory by Oedometer test. The results showed that the coefficient of consolidation of soft soil varies from 0.052.10-3 to 3.3.10-3cm2/s, otherwise the compression index changes from 0.156 to 1.703, soil is in a normally consolidated or over the consolidated state. These properties also change differently with depth. It also indicated that the compressive index of soft soil has a fine linear relationship with the liquid limit، water content, and void ratio. The coefficient of consolidation of soft soil decreases with the increase of compression pressure. These parameters are basic for calculating the settlement of underground structures in Ho Chi Minh City.

scholarly journals Review on Lateral Stability of Piled Riverine Structures in the Estuaries of Sarawak

2018 ◽  
Vol 7 (3.18) ◽  
pp. 21
Author(s):  
Lee Lin Jye ◽  
Shenbaga R. Kaniraj ◽  
Siti Noor Linda bt Taib ◽  
Fauzan Bin Sahdi
Keyword(s):  
Soft Soil ◽  
Natural State ◽  
Soil Conditions ◽  
Silty Clay ◽  
River Bank ◽  
Soil Movement ◽  
Geotechnical Problem ◽  
Construction Activity ◽  
Lateral Soil Movement ◽  
The Stability

Soft soil conditions with very soft and deep silty clay have constantly endangered the stability of the riverine and estuarine structures in Sarawak. There have been many failures of jetties, wharves and bridges in Sarawak. In many cases of failures, the piles were not designed to resist the lateral movement, unless they were included to stabilize unstable slopes or potential landslides. This practice may be due to reasons such as erroneously judging the river bank as stable in slope stability analysis or simply due to the inexperience of designers. Also, when the river bank approaches the limiting stability in its natural state any construction activity on the river bank could result in lateral soil movement. This paper highlights this important geotechnical problem in Sarawak. Then it presents the details of a few failures of estuarine structures. A review of situations causing lateral loading of piles is then presented. The results of the in-soil and in-pile displacement measurements are shown in this paper and it is found that the computation made to compare between field and 3D modeling is agreeable.  

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