Embankment Stabilization Techniques for Railroads on Permafrost

2016 ◽  
Author(s):  
Priscilla E. Addison ◽  
Pasi Lautala ◽  
Thomas Oommen ◽  
Zachary Vallos
Keyword(s):  
Crushed Rock ◽  
Hudson Bay ◽  
Civil Structures ◽  
Advantages And Disadvantages ◽  
Local Site ◽  
Time Period ◽  
Combination Of Methods ◽  
Ice Content ◽  
Stability Issues ◽  
Permafrost Regions

Degrading permafrost conditions around the world has resulted in stability issues for civil structures founded on top of them. Railway lines have very limited tolerance for differential settlements, making it a priority for railway owners in permafrost regions to consider embankment stabilization measures that ensure smooth and safe operations. Several passive and active engineered solutions have been developed to address the permafrost stability issues, such as awnings, shading boards, crushed rock embankments, ventiduct embankments, and thermosyphons. Local site conditions, including soil type, soil temperature, ice content, and precipitation determines which method is selected for a particular site and in most cases the best stabilization solution is a combination of two or more alternatives. When potential solution can be identified, it will only be implemented if perceived benefits exceed the implementation and maintenance costs. This paper aims to provide a brief literature review on some common embankment stabilization solutions with consideration to the Hudson Bay Railway (HBR) in northern Manitoba, Canada which has been witnessing thaw settlements for extensive time period. It will discuss the applicability of the different methods, the advantages and disadvantages of the different methods, as well as the benefits to be derived by utilizing a combination of methods.

scholarly journals A Holistic and Systematic Assessment of Maintenance Approaches in Heritage Sites

2021 ◽  
Vol 16 ◽  
pp. 335-350
Author(s):  
Abobar Al-Sakkaf ◽  
Samer El-Zahab ◽  
Eslam Mohammed Abdelkader ◽  
Ghasan Alfalah
Keyword(s):  
Construction Projects ◽  
Future Research ◽  
Research Attention ◽  
Systematic Assessment ◽  
Heritage Sites ◽  
Advantages And Disadvantages ◽  
Research Areas ◽  
Heritage Site ◽  
Time Period ◽  
Ultimate Objective

Maintenance approaches of heritage sites (MAHs) on heritage sites have become essential in both the industry and academia as construction projects grow increasingly complex. With a prime goal of increasing its productivity and safety, MAHs research has witnessed tremendous growth over the past three decades. With the increase in research grows the necessity to monitor the research growth of a research topic to identify its trends and gaps, and hence shed the light on research areas that warrant future research attention, there is a lack of systematic literature analysis in MAHs field. To fill this gap, this paper recruited a mixed-review method of scientometric and systematic reviews of research papers on MAHs published from 1990 to 2020 (as of mid of July). Its ultimate objective is to identify current trends, technologies, and techniques in the field of heritage site maintenance and layout their advantages and disadvantages. Additionally, country contributions are highlighted to identify which countries produce the most effective research in the field. Finally, the most cited articles are identified to highlight important topics in the selected time period. As a result, Journal of Destination Marketing & Management has the highest ranking across the different journals in the area of MAHs based on its number of published articles and their citations. In addition, the publisher Elsevier has the highest number of published articles with 58. Results also demonstrated that the collaboration between Ecuador and Spain accomplished the highest ranking, such that the strength link was estimated to be equal to 3. Moreover, the highest repetitive keywords were indicators with 20 times and cultural heritage cities with 19 times.

scholarly journals Novel Prediction Method for Highway Distresses in Permafrost Regions Based on Qualitative Reasoning of Multidimensional and Multirules Cloud Model

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Chi Zhang ◽  
Hong Zhang ◽  
Min Zhang ◽  
Quanli Gong
Keyword(s):  
Cloud Model ◽  
Prediction Method ◽  
Large Data ◽  
Qualitative Reasoning ◽  
Data Output ◽  
Infrastructure Project ◽  
Ice Content ◽  
Data Inference ◽  
Evaluation Parameters ◽  
Permafrost Regions

Highway in permafrost regions has numerous diseases during operation, due to instability and degradation of permafrost. To predict distress sections of a newly built highway in permafrost regions, we proposed a new method based on the multidimensional and multirules reasoning cloud model. Herein, the evaluation parameters affecting the highway distresses in permafrost regions, i.e., annual average ground temperature, ice content, and frozen-heave factor, were as the data input, whereas the distress degree was as the data output; all of the aforementioned were described by a cloud model. Based on the analysis of distress large data, inference rules and a cloud reasoning prediction model were established. Subsequently, distress degrees of the 10 equidistance highway sections were predicted on the Qinghai-Tibet highway by using the cloud model, and actual distress degree and predicted distress degree were compared by using the regression analysis algorithm. The results showed that the relevance between the actual distress degree and the predicted distress degree was 0.738. The study provides a feasible and effective method to predict the potential distress sections of the newly built highway and better plan infrastructure project on permafrost regions.

The albedo of crushed-rock layers and its implication to cool roadbeds in permafrost regions

2016 ◽  
Vol 128 ◽  
pp. 32-37 ◽  
Author(s):  
Yinghong Qin ◽  
Kanghao Tan ◽  
Haifeng Yang ◽  
Fanghua Li
Keyword(s):  
Crushed Rock ◽  
Permafrost Regions

Effect of Vibrating Load on Grain Size Distribution of Crushed Rock Layer

2010 ◽  
Vol 168-170 ◽  
pp. 663-668
Author(s):  
Li Jun Yang ◽  
Wen Hui Bai ◽  
Bin Xiang Sun ◽  
Shuang Jie Wang ◽  
Jin Zhao Zhang
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Crushed Rock ◽  
Rock Layer ◽  
Fines Content ◽  
The Matrix ◽  
Study Laboratory ◽  
Permafrost Regions ◽  
Highway Embankment

For the construction of the proposed Qinghai-Tibet Express Highway in warm and ice-rich permafrost regions, it will be necessary to utilize the new technique of cooling the ground temperature by the coarsely crushed rock layer with a low fines content, instead of the traditional measures taken to increase simply thermal resistances, so as to protect from damage to highway embankment due to thaw settlement. The vibrating loads such as wheel load and tamping load may cause the breakage and abrasion of the matrix grains in the coarsely crushed rock layer. This results in decreasing of grain size and increasing of fines content in the crushed rock layer, thus decreasing the porosity of crushed rock layer. The smaller porosity of crushed rock layer may weaken the cooling effect of buoyancy-driven natural convection of the pore air in the crushed rock layer of the highway embankment, thus resulting in instability and failure of the embankment structure in permafrost regions. Under these conditions, the influence of vibrating load on the grain size distribution of the coarsely crushed rock layer has to be investigated experimentally. In the present study, laboratory experiments on the grain size variation of the coarsely crushed rock layer under vertically vibrating loads were carried out. The test results show that the vibrating load can cause the breakage and abrasion of the matrix grains in the coarsely crushed rock layer and the shapes of coarely crushed rock grain tend to be non-angular.

Fieldwork among the Goemai in Nigeria: discovering the grammar of property expressions

2007 ◽  
Vol 60 (1) ◽  
pp. 67-80
Author(s):  
Birgit Hellwig
Keyword(s):  
Advantages And Disadvantages ◽  
Combination Of Methods

Abstract This paper describes fieldwork experiences among the Goemai of Central Nigeria. It first introduces the fieldwork setting, and then focuses on one illustrative example: the investigation of property-denoting (‘adjectival’) expressions. The paper describes the different methods employed, compares them, and evaluates their results. It shows some advantages and disadvantages, and – on this basis – advocates using a combination of methods in order to benefit from each method's advantages while counterbalancing its disadvantages. In particular, the paper argues in favour of a semantics-based approach to fieldwork, illustrating the invaluable insights to be gained from it.

scholarly journals Aflatoxin species: their health effects and determination methods in different foodstuffs

2012 ◽  
Vol 10 (3) ◽  
pp. 675-685 ◽  
Author(s):  
Sezgin Bakırdere ◽  
Selin Bora ◽  
E. Bakırdere ◽  
Fırat Aydın ◽  
Yasin Arslan ◽  
...  
Keyword(s):  
Health Effects ◽  
Analytical Techniques ◽  
The Other ◽  
Advantages And Disadvantages ◽  
Time Period ◽  
Long Time ◽  
Sensitive Determination ◽  
Determination Methods ◽  
And Storage

AbstractCarcinogenic and mutagenic properties of aflatoxin species are known in literature. Their intake over a long time period might be health-dangerous for human even at trace levels. It is well known that different foodstuffs can be contaminated by aflatoxin species through growing and storage. Due to the serious health effects, sensitive determination of aflatoxin species in any matrices related with the human being is very crucial at trace levels. In literature, there are sensitive techniques to analyze the different samples for the contents of their aflatoxin species. Each technique has some advantages and disadvantages over the other techniques. This review aims to summarize the different health effects of aflatoxin species, development of analytical techniques and applications of developed techniques in a variety of matrices.

scholarly journals PECULIARITIES OF CONSTRUCTION OF GEODESIC NETWORK FOR DEVELOPMENT OF OPEN MINERAL DEPOSITS

2020 ◽  
Vol 11 (87) ◽  
Author(s):  
Oksana Serant ◽  
◽  
Olena Kubrak ◽  
Nataliia Yarema ◽  
Maksym Batura ◽  
...  
Keyword(s):  
Geodetic Network ◽  
Cost Effective ◽  
Weather Conditions ◽  
Reference Network ◽  
Satellite Measurement ◽  
Geodetic Networks ◽  
Advantages And Disadvantages ◽  
Adverse Weather ◽  
The Creation ◽  
Combination Of Methods

The creation of geodetic networks for open deposits has its own characteristics, in contrast to the creation of conventional geodetic networks. Surveying networks of support points for groups of quarries and individual quarries located in developed mining regions, as well as in large industrial, hydraulic and agricultural structures adjacent to cities, are being developed on the basis of existing networks of higher-class triangulation points. In the absence of higher-class triangulation points, open source support networks are created independently. The study of geodetic monitoring in mining, especially in deposits that are developed in an open way. The design of geodetic reference networks depends entirely on the shape of the quarry and the system of its opening. According to its form, choose the method of creating a planned geodetic basis. For the most part, a backbone network is created to further condense and create a film network.After analyzing the methods of creating a spatial reference network for open deposits, we concluded that the classical methods of creating a planned-height geodetic network on the territory of the mining enterprise are time-consuming, long-term and economically unprofitable. The GNSS method is the best for creating such networks at present. Of course, it cannot fully replace all methods due to various constraints, such as interference, lack of communication, and adverse weather conditions. Therefore, given the advantages and disadvantages of the methods analyzed in the article to create spatial networks in open fields, the authors consider it appropriate to combine the GNSS method with polygonometry, as the use of only satellite measurement method is impractical, but in combination with polygonometry -altitude networks for geodetic works. This combination significantly reduces measurement time, is less time-consuming, cost-effective and meets the accuracy requirements of the relevant networks. Approbation of the combination of methods for the creation of a spatial geodetic network for monitoring the open field was carried out at the Vilnohirsk mining and metallurgical plant.

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