Climate Change Implications on the Condition of the Road Surface in Bulgaria

Belev, Georgi; Ivanova-Radovanova, Petja; Ivanov, Vladimir; Chervenkov, Hristo

doi:10.1007/978-3-031-26754-3_9

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…Anti-icing chemical reagents and chemical compounds of the environment aggressively affect the concrete of the road bed. All this leads to the need to solve the problem of durability of road surfaces [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Modelling of a Three-Dispersed Suspension Filtration

Safina¹

2023

IJCCSE

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The injection method of soil stabilization is one of the methods to improve the soil base during the road construction. This method consists in the introduction of special compounds into the ground with the help of special equipment. Such compositions, as a rule, are solutions of polymers or cement, which harden, forming a solid base. The advantages of the injection method of soil stabilization for roads include rapid completion of work, minimal environmental impact, the possibility of application in difficult geological conditions, as well as strengthening the soil base at great depth. Injection solutions penetrate into microcracks and micropores of soils, forming a deposition. The study of liquid filtration in a porous soil system is of great practical importance. The paper considers the filtration of liquid in a porous medium with three types of particles. In the considered problem, each of the three types of suspension particles is characterized by its linear filtration function. It determines the size-exclusion particle capture mechanism, in which particles whose diameter exceeds the size of the pores get stuck in them, the rest pass through them unhindered. Numerical solutions are obtained for the concentrations of suspended particles of three types, as well as the total deposition. Depending on the initial parameters of the problem, the concentrations of suspended particles are either monotonic functions or non-monotonic, reaching the maximum value. In this paper, asymptotic solutions are constructed for the concentrations of suspended and retained particles near the concentration front, which are compared with numerical ones. The solution is obtained at infinity using a traveling wave.

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Section: Introductionmentioning

confidence: 99%

Modelling of a Three-Dispersed Suspension Filtration

Safina¹

2023

IJCCSE

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Applying cluster analysis in Bulgarian chemical industry for the period 2010-2020

Stoyanova,

Ravnachka,

Genchev

2024

J geographical I JC

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This paper discusses the territorial organization of the chemical industry in Bulgaria. Using the ESRI ArcGIS software and applying cluster analysis, the study aims to group (cluster) the 28 Bulgarian districts (NUTS 3 level classification) based on produced output, persons employed, and Bulgarian lev (BGN) equivalent of foreign exchange earnings from exports for the period 2010-2020. Three reference years, 2010, 2015, and 2020, have been selected for the observed period. The general conclusion is that the chemical industry in Bulgaria is characterized by high territorial concentration. Varna was the leading district in developing the chemical industry in the observed period from 2010 to 2020, followed by Plovdiv, Ruse, and Sofia (the capital). At the other pole were the districts of Vidin, Montana, Vratsa, Pleven, Lovech, Razgrad, Silistra, Targoviste, Dobrich, Pernik, Kyustendil, Blagoevgrad, Sliven, Yambol, and Kardzhali. The findings of the research show that territorial polarization is linked with several factors that can be grouped according to their impact into four groups: 1) raw material and energy, 2) transport infrastructure and proximity to the end user, 3) state and environmental regulations, and 4) provision of skilled labor.

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Climate Change Implications on the Condition of the Road Surface in Bulgaria

Cited by 2 publications

References 14 publications

Modelling of a Three-Dispersed Suspension Filtration

Modelling of a Three-Dispersed Suspension Filtration

Applying cluster analysis in Bulgarian chemical industry for the period 2010-2020

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