scholarly journals Displacements of Object Founded on Expansive Soils—A Case Study of Light Construction

Geosciences ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 153
Author(s):  
Aleksandra Gorączko ◽  
Jacek Sztubecki ◽  
Adam Bujarkiewicz ◽  
Szymon Topoliński
Keyword(s):  
Environmental Changes ◽  
Expansive Soils ◽  
Seasonal Fluctuations ◽  
Volume Changes ◽  
Expansive Clays ◽  
Natural Moisture Content ◽  
Geotechnical Investigations ◽  
Main Factors ◽  
Spatial Displacements

The paper presents results of observations of a light structure damaged by irregular vertical and horizontal deformations on Neogene expansive clays, typical for area in Central Poland. The sensitivity to environmental changes of humidity in such subsoils can activate volume changes, which causes the destruction of many objects susceptible to deformation. Detailed geotechnical investigations, including seasonal fluctuations of natural moisture content, were carried out for over a year, describing the dynamism of conditions of clays in the foundation zone. Parallel geodetic measurements of vertical and horizontal displacements were carried out, using classical precision leveling and the coordinate method of the Leica TDRA 6000 laser station. The network of measurement points has been specially designed and implemented to follow the spatial displacements of the structure. The network points were placed at the bottom of pillars and on the flooring of the structure located in the upper part. In the paper, the results of the vertical and horizontal periodical measurement of displacements of an investigated construction over the year were discussed to identify the main factors influencing the mechanism of damage of the observed structure.

scholarly journals The displacement of structures founded on expansive soils – unapparent causes

2018 ◽  
Vol 45 ◽  
pp. 00098
Author(s):  
Szymon Topoliński ◽  
Aleksandra Gorączko ◽  
Jacek Sztubecki ◽  
Adam Bujarkiewicz
Keyword(s):  
Environmental Changes ◽  
Expansive Soils ◽  
Monitoring Program ◽  
Field Measurements ◽  
Building Structure ◽  
Volume Changes ◽  
Coordinate Method ◽  
Geotechnical Investigations ◽  
Vertical Displacements ◽  
Soil And Water

Determining the causes for the displacement of damaged structures located on expansive soils often requires meticulous and individual analyses of many factors. The sensitivity of the expansive subsoils to environmental changes in humidity, activating its volume changes, requires a careful and comprehensive monitoring of structures susceptible to deformation. The article presents the method of the diagnostics of structures, located on an expansive subsoil in Poland. The methodology and preliminary results of the measurement of the vertical displacements of a building structure founded on expansive subsoil were presented. During field measurements, periodic geodetic measurements of structural displacements were carried out using classical precision levelling and the coordinate method of the Leica TDRA 6000 laser station. At the same time, geotechnical investigations were carried out describing the condition of the ground on which the structure is located. An analysis of the obtained results allowed determining the existing soil and water conditions and drawing unapparent conclusions regarding the causes of damage to the tested structure. On this basis, a further structures monitoring program was established.

scholarly journals STABILIZATION OF EXPANSIVE SOIL WITH MIXING CA(OH)2 (EXPANSIVE SOIL CASE STUDY: JATILUHUR HAMLET, GLAGAH AGUNG VILLAGE, PURWOHARJO DISTRICT, BANYUWANGI REGENCY)

2019 ◽  
Vol 3 (1) ◽  
pp. 17
Author(s):  
Celia Nindy Carisa ◽  
Mokhammad Farid Ma'ruf ◽  
Paksitya Purnama Putra
Keyword(s):  
Expansive Soils ◽  
Clay Fraction ◽  
Expansive Soil ◽  
Special Treatment ◽  
Chemical Stabilization ◽  
Curing Time ◽  
Volume Changes ◽  
Lime Content ◽  
The Face

Expansive soils can cause problems in construction due to changing volume changes. The area that is suspected to have an expansive soil type is Glagah Agung village, Purwoharjo District, Banyuwangi. Every season change, the construction of the building is always damaged, especially on the structure of the building. In the rainy season, the land will expand and cause the building to rise, while at the dry season the land will shrink and there is a decline in buildings. In the face of these problems, it is necessary to do special treatment to improve the nature of the expansive soil. One is chemical stabilization, adding chemicals to improve soil properties and reduce their development potential. In this study, the stabilizers used are Ca (OH) 2 lime with a percentage of 4%, 6%, 8%, 10%, 12% with curing time for one day. The results of soil become less plastic with an increase of lime content. The decrease of plasticity index is supported by grain test which is the decrease of clay fraction grain on soil mixed with lime according to the USCS method and AASHTO method. There was a decrease in the percent of original primary soil development which was initially 11.9% decreased to 2.181% 4% lime content, and 0% at 6% to 12%. Tanah ekspansif dapat menimbulkan masalah dalam konstruksi akibat perubahan volume yang berubahubah. Daerah yang diduga memiliki jenis tanah ekspansif adalah Desa Glagah agung Kecamatan Purwoharjo, Kabupaten Banyuwangi. Setiap pergantian musim, konstruksi bangunan selalu mengalami kerusakan terutama pada struktur dari bangunan. Pada musim penghujan tanah akan mengembang dan mengakibatkan bangunan terangkat, sedangkan pada saat kemarau tanah akan menyusut dan terjadi penurunan bangunan. Dalam menghadapi permasalahan yang terjadi maka perlu dilakukan treatment khusus untuk memperbaiki sifat tanah ekspansif. Salah satunya adalah stabilisasi kimiawi, dengan menambahkan bahan kimia untuk memperbaiki sifat tanah dan mereduksi potensi pengembangannya. pada peneliatian ini, stabilitator yang digunakan adalah kapur Ca(OH)2 dengan prosentase 4%,6%,8%,10%,12% dengan waktu peram (curing) selama 24 jam. Didapatkan hasil tanah menjadi tidak plastis seiring dengan bertambahnya kadar kapur. Penurunan indeks plastisitas didukung dengan pengujian gradasi butiran yaitu berkurangnya butiran fraksi lempung pada tanah yang dicampur dengan kapur menurut metode USCS dan metode AASHTO. Terjadi penurunan persen pengembangan primer tanah asli yang mulanya sebesar 11,9% berkurang menjadi 2,181% kadar kapur 4%, dan 0% pada kadar 6% hingga 12%.

scholarly journals A Case Study of a Large Unstable Mass Stabilization: “El Portalet” Pass at the Central Spanish Pyrenees

2021 ◽  
Vol 11 (16) ◽  
pp. 7176
Author(s):  
Guillermo Cobos ◽  
Miguel Ángel Eguibar ◽  
Francisco Javier Torrijo ◽  
Julio Garzón-Roca
Keyword(s):  
Water Table ◽  
Critical Factor ◽  
Slope Stabilization ◽  
Survey Techniques ◽  
Geotechnical Investigations ◽  
Spanish Pyrenees ◽  
Parking Lot ◽  
Unstable Slope ◽  
Total Stability

This case study presents the engineering approach conducted for stabilizing a landslide that occurred at “El Portalet” Pass in the Central Spanish Pyrenees activated due to the construction of a parking lot. Unlike common slope stabilization cases, measures projected here were aimed at slowing and controlling the landslide, and not completely stopping the movement. This decision was taken due to the slow movement of the landslide and the large unstable mass involved. The degree of success of the stabilization measures was assessed by stability analyses and data obtained from different geotechnical investigations and satellite survey techniques such as GB-SAR and DinSAR conducted by different authors in the area under study. The water table was found to be a critical factor in the landslide’s stability, and the tendency of the unstable slope for null movement (total stability) was related to the water table lowering process, which needs more than 10 years to occur due to regional and climatic issues. Results showed a good performance of the stabilization measures to control the landslide, demonstrating the effectiveness of the approach followed, and which became an example of a good response to the classical engineering duality cost–safety.

Improvement of Strength and Volume-Change Properties of Expansive Clays with Geopolymer Treatment

2021 ◽  
pp. 036119812110018
Author(s):  
Rinu Samuel ◽  
Anand J. Puppala ◽  
Aritra Banerjee ◽  
Oscar Huang ◽  
Miladin Radovic ◽  
...  
Keyword(s):  
Volume Change ◽  
Carbon Dioxide Emissions ◽  
Expansive Soils ◽  
Linear Shrinkage ◽  
Plasticity Index ◽  
Specimen Preparation ◽  
Expansive Clays ◽  
Change Behavior ◽  
Volume Change Behavior ◽  
Lower Carbon

Expansive soils are conventionally treated with chemical stabilizers manufactured by energy-intensive processes that significantly contribute to carbon dioxide emissions globally. Geopolymers, which are synthesized from industrial byproducts rich in aluminosilicates, are a viable alternative to conventional treatments, as they are eco-friendly and sustainable. In this study, a metakaolin-based geopolymer was synthesized, and its effects on the strength and volume-change behavior of two native expansive soils from Texas, with a plasticity index over 20 were investigated. This paper elaborates on the geopolymerization process, synthesis of the metakaolin-based geopolymer, specimen preparation, and geopolymer treatment of soils. Comprehensive material testing revealed two clays with a plasticity index over 20. They were each treated with three dosages of the metakaolin-based geopolymer and cured in 100% relative humidity for three different curing periods. The efficiency of geopolymer treatment was determined by testing the control and geopolymer-treated soils for unconfined compressive strength (UCS), one-dimensional swell, and linear shrinkage. Field emission scanning electron microscope (FESEM) imaging was performed on the synthesized geopolymer, as well as on the control and geopolymer-treated soils, to detect microstructural changes caused by geopolymerization. A significant increase in UCS and reduction in swelling and shrinkage were observed for both geopolymer-treated soils, within a curing period of only 7 days. The FESEM imaging provided new insights on the structure of geopolymers and evidence of geopolymer formation in treated soils. In conclusion, the metakaolin-based geopolymer has strong potential as a lower-carbon-footprint alternative to conventional stabilizers for expansive soils.

A Dynamic Service Pool Size Configuration Mechanism for Service-Oriented Workflow

2011 ◽  
Vol 186 ◽  
pp. 499-504 ◽  
Author(s):  
Pan He ◽  
Jie Xu ◽  
Kai Gui Wu ◽  
Jun Hao Wen
Keyword(s):  
System Reliability ◽  
Environmental Changes ◽  
Point Of View ◽  
Pool Size ◽  
Reliability Model ◽  
Optimal Method ◽  
Service Oriented ◽  
Overall Reliability

Service-oriented workflows are the fundamental structures in service-oriented applications and changes in the workflow could cause dramatic changes in system reliability. In several ways to re-heal workflows in execution, re-sizing service pools in the workflow is practical and easy to implement. In order to quickly adjust to workflow or environmental changes, this paper presents a dynamic service pool size configuration mechanism from the point of view of maintaining workflow reliability. An architecture-based reliability model is used to evaluate the overall reliability of a workflow with service pools and an optimal method is proposed to get the combination of service pool size aiming at minimizing the sum of service pool size subject to the workflow reliability requirement. A case study is used to explain this method and experiment results show how to change service pool size to meet the workflow reliability requirements.

Estimation of the Environmental Flow Regime to Deter-mine the Minimum Flow for Pollution Reduction: Wadi Zomar - Palestine as a Case Study

2020 ◽  
Vol 8 (1) ◽  
pp. 21-33
Author(s):  
Saed Khayat
Keyword(s):  
Flow Regime ◽  
Base Flow ◽  
Pollution Reduction ◽  
Flood Inundation ◽  
Healthy Environment ◽  
Floodplain Inundation ◽  
Main Factors ◽  
Bar Formation

Possible factors that play a role in restoring a flow regime that supports a healthy environment were identified for Wadi Zomar, Palestine. The hydrograph shows that threshold discharges for bed drying are less than 0.14 m3/s, bar formation is less than 0.4 ms/s and floodplain inundation events are over 3 m3/s. The HEC-RAS model suggests a continuous discharge throughout the year that maintains the base flow in the range of 0.5 m3/s. The model suggests that the restoration process is controlled by two main factors: role of sufficient flow and flood inundation frequency

scholarly journals DESTINATION SUCCESSES FACTORS FOR MILLENNIAL TRAVELERS CASE STUDY OF TANAH LOT TEMPLE, TABANAN, BALI

2020 ◽  
Vol 1 (2) ◽  
pp. 136-146
Author(s):  
Jaya Pramono ◽  
I Made Sumartaha ◽  
Bambang Purwantoro
Keyword(s):  
Generation Y ◽  
Quantitative Research ◽  
Survey Design ◽  
Descriptive Statistics ◽  
Success Factor ◽  
Research Model ◽  
Business Travel ◽  
Gen Y ◽  
Main Factors

Millennials are a popular term to replace the term Generation Y (Gen Y). There are 2.5 billion millennials worldwide. They have contributed to business travel, and tend to spend most of their expenses on travel and vacation, driven by future travel trends. This research conducted to shape the success factor of the destination for millennial tourists, where the destination of Tanah Lot Temple is used as a case study, which is quantitative research, using survey design and purposive sampling. There are 160 millennial tourists as respondents (who are visited Tanah Lot Temple). The instrument used was a questionnaire with a Likert scale, and the data were analysed using descriptive statistics and factor analysis. This research has indicated that there are nine (9) main factors that shape the success factor of the destination for millennial tourists. The nine main factors are: Millennials interested in traditional costume guides and officers, believe in social media reviews, Millennial will add several/more days to enjoying the destination, The layout of the souvenir shop, buildings, temples, parks, and the others building should support sustainable practices. A millennial will invite parents and closest friends for visiting destination. The experience in destination worth it with or even more than spending, and meet the expectations. The facility of destination affected millennials during visiting. Millennials are interested in the culture at the destination. Traveling is a necessity for Millennial. This research model has an accuracy of 71% on the error rate of 5%.

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