About effect of dynamic loading caused by concrete pump on bending moments, anchor forces and deformations in single level anchored retaining wallMarkov, Iliyan; Radlov, Kalin
doi: 10.1088/1757-899x/1297/1/012005pmid: N/A
This paper explore effect of dynamic loading caused by concrete pump on bending moments, anchor forces and deformations in single level anchored retaining wall. Dynamic loading is obtained by using a special developed dynamic mathematical model of truck-mounted concrete pump, by means of which are calculated the maximal dynamic loadings (acceleration and forces), which are transferred from concrete pump to the soil, and from there accordingly – from soil to the retaining wall under consideration. After that is performed a detailed finite element analysis of the retaining wall, by using software product Plaxis 3D, during which are analyzed the variation of bending moments, anchor forces and deformations in single level anchored retaining wall and after dynamic loading applying. There is also a numerical example considered, for which are calculated the maximal dynamic loadings, which are transferred from concrete pump to the soil, and from ground supports to the retaining wall. An amplification factor (dynamic factor) due to dynamic effects is calculated, by which is necessary to be multiplied the static loadings caused by concrete pump on soil. In the conclusion is made a qualitative assessment of the dynamic influence of concrete pump on the soil and the retaining wall section and ground anchor.
Experiences and practices from application of rockfall remedial works at MKD national road networkJovanovski, Milorad; Peševski, Igor; Papić, Jovan Br.; Abazi, Sead
doi: 10.1088/1757-899x/1297/1/012010pmid: N/A
Rockfalls, landslides and floods continue to have a growing share in the overall damages and losses, influencing considerably the national budget. Recent experiences and practices related to application of stabilisation measures and remediation of rockfall zones along MKD national road network are presented in the article. Analyses are based on case histories where the prognosis of geotechnical conditions is a key element in definition of remedial measures for rock slopes. Some issues related with Consequence Class, as suggested in Eurocode 7 202x, and the concepts of Acceptable Level of Risk are presented. Proposals in definition of Acceptable Level of Risk, through combining Probability of Failure, Reliability Index and Consequence Classes, are given in the article. These findings can help in development and/or improvement of rockfall, landslide and flood risk management strategies.
Possibilities for the construction of a parallel route of the European transport corridor No 9 through Romania, Bulgaria, and GreeceTsonkov, Nikolay; Petrov, Kamen
doi: 10.1088/1757-899x/1297/1/012018pmid: N/A
The Bulgarian state is significantly behind in the development of its strategic road infrastructure. This circumstance is complemented by the deteriorated state of the already-built infrastructure in the Bulgarian state. There is a need to change the policy philosophy for managing and maintaining the strategic infrastructure in Bulgaria. It is necessary to strongly link this policy with the regional development policy, due to the similar objectives they must achieve. They are aimed at bringing Bulgarian regions closer together, and their economic and regional development based on improved connectivity between them. Achieving all this, however, is hampered by a significant deficit in the system. There is a lack of connectivity and development of the transport axes in the North-South direction. In this regard, the authors set as their main objective to analyze and assess the possibilities for the construction of a parallel route of the European transport corridor No. 9 through Romania, Bulgaria, and Greece, which includes the construction of a tunnel between the town of Troyan and the village of Karnare in the central part of the Balkan Mountains. The implementation of this project will bring economic, social, transport, and financial benefits to the Bulgarian state. The construction of the project ensures connectivity between the Balkan countries, the formation of a single European market, stimulating the development of Northern Bulgaria, and a targeted impact on the North and South-Central planning regions.
Prefacedoi: 10.1088/1757-899x/1297/1/011001pmid: N/A
XVI National Transport Infrastructure Conference with International ParticipationThe transport infrastructure is an issue that concerns every member of our society regardless of age, gender, or race. The necessity to discuss its flaws and make amends to do better each day is constant and undeniable, but with the rapid development of computer technology now, more than ever, we must be flexible and adapt to the innovations in our sector.During the XVI National Transport Infrastructure Conference with international participation (NTICIP 2023) we celebrated and shared our achievements, but also paid attention to the problems and challenges ahead of us. Our main goal as an organizer is to create a sustainable connection between administration, science, and business.This year (2023) the main emphasis was on Road Safety, Digitalization, Technology, Strategic Infrastructure, Standards, Geotechnical Engineering and Sustainable Materials.Each guest who took part in the Conference, held from 5th to 7th of October 2023 in Nessebar, Bulgaria, had the opportunity to discuss the scientific side of engineering issues, exchange information and develop professional contacts.Organizing one of the biggest professional forums on the Balkan Peninsula is not an easy task. I am pleased to acknowledge the work of my colleagues at the Institute of Transportation Engineering and the University of Architecture Civil Engineering and Geodesy. But most of all we are all grateful to the authors for entrusting us with their work.Prof. Dr. Eng. Nikolay Mihaylov,Chairman of scientific board at Institute of transportation engineeringList NTICIP 2023 Scientific Committee is available in the Pdf.
The Economic Factor as a Key in Planning Activities of the National Road NetworkTzonevska, Phd Dina
doi: 10.1088/1757-899x/1297/1/012017pmid: N/A
Transport has a key role in economic and social development. It generates economic growth by increasing access to health, education, and other national and regional public services. On one hand, investment in the transport sector boosts economic growth by increasing the return on private investment. On the other hand, the improvement of the transport service helps to reduce the prices of resources and thus - to reduce the production costs, to increase the possibilities of access to different markets. An important problem in defining the need for the construction of transport infrastructure objects is consideration of the economic factor of the projects. It is necessary for making decisions on the implementation of transport policy at the national and international level. Bringing out the economic factor as a key factor in the planning of activities on the national road network has a wide public significance, this necessitates the improvement of coordination in terms of its implementation.
Advanced technologies for landslide monitoringMilev, N.; Totsev, A.; Angelova, M.
doi: 10.1088/1757-899x/1297/1/012008pmid: N/A
The article reviews modern landslide monitoring methods. The purpose of the observation method in the design and control of the behavior of geotechnical structures and its role in creating chances for cost savings or pre-emptively averting construction risks is a driving force in the context of landslides. This approach is established within Eurocode 7 as a fundamental tenet of geotechnical design, serving as a valid validation method for limit states. Monitoring of large areas is common in everyday engineering practice which makes the installation of transducers in multiple points very difficult. Due to this reason the use of so-called contactless approaches is widely accepted. A distinguishable representor of that method is DInSAR – technique for successful displacements measurement by means of SAR data which is economically feasible and capable of detecting classic failure modes. The article presents and compares methods such as: LiDAR, Infrared sensors, Fiber oprics, Shape array accelerometers, In-place inclinometers, and others. Despite the development of technologies, the application of monitoring in Bulgaria is not enough used.
Analysis of the impact of rail head wear on railway superstructure stabilityMirchev, K; Lepoev, M
doi: 10.1088/1757-899x/1297/1/012014pmid: N/A
Continuous welded rail track (CWR) is a superstructure construction of the railway that withstands significant compressive forces from the longitudinal extension of the rails due to temperature changes, ensuring the safe railway operation. The applicable for the Bulgarian railway system methodology for determining the critical compressive force at which the CWR loses stability has been examined. Different types of rails with their respective design parameters, important for the force calculation, have been taken into consideration. The considered design parameters, as moment of inertia and sectional modulus of the rails, change during operation due to the rail head wear. The aim of the article is to examine specific examples of railway tracks on curves, analyzing the impact of the changed operational design parameters of the rail on the stability of the track. The operational and geometric parameters of the railway track have been considered.
Strategic development of the national road networkPaunova, Desislava; Tzonevska, Dina
doi: 10.1088/1757-899x/1297/1/012016pmid: N/A
Strategically developed transport infrastructure is a basic prerequisite for efficient, effective, and sustainable transport. The transport infrastructure is essential for economic growth, for the mobility of labor resources, for the supply of transport services and for the competitiveness of the bulgarian economy. A major problem identified in relation to the characteristics and qualities of the infrastructure along the main routes is the lack of continuous, consistent, and permanent transport networks to ensure fast and safe movement over longer distances. The development of the national road network must follow the principles of continuity and synergy with the national and European strategic documents. The main strategic priorities in the development of transport are effective maintenance and modernization of the transport infrastructure, as well as increasing the security and safety of the transport system.
Peer Review Statementdoi: 10.1088/1757-899x/1297/1/011002pmid: N/A
All papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.1. Type of peer review: Single anonymous2. Conference submission management system: Morressier3. Number of submissions received: 274. Number of submissions sent for review: 275. Number of submissions accepted: 226. Acceptance Rate (Submissions Accepted / Submissions Received × 100): 81.48 %7. Average number of reviews per paper: 1.008. Total number of reviewers involved: 129. Contact person for queries:Name: Eng. Georgia KinevaAffiliation: Institute of transportation engineering LtdEmail: [email protected]