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Volume 44 (2022): Edizione 3 (September 2022)

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Volume 43 (2021): Edizione 4 (December 2021)

Volume 43 (2021): Edizione 3 (September 2021)

Volume 43 (2021): Edizione 2 (June 2021)

Volume 43 (2021): Edizione s1 (December 2021)
Special Edizione: Underground Infrastructure of Urban Areas

Volume 43 (2021): Edizione 1 (April 2021)

Volume 42 (2020): Edizione 4 (December 2020)

Volume 42 (2020): Edizione 3 (September 2020)

Volume 42 (2020): Edizione 2 (June 2020)

Volume 42 (2020): Edizione 1 (April 2020)

Volume 41 (2019): Edizione 4 (December 2019)

Volume 41 (2019): Edizione 3 (September 2019)

Volume 41 (2019): Edizione 2 (June 2019)

Volume 41 (2019): Edizione 1 (April 2019)

Volume 40 (2018): Edizione 4 (December 2018)

Volume 40 (2018): Edizione 3 (November 2018)

Volume 40 (2018): Edizione 2 (October 2018)

Volume 40 (2018): Edizione 1 (July 2018)

Volume 39 (2017): Edizione 4 (December 2017)

Volume 39 (2017): Edizione 3 (September 2017)

Volume 39 (2017): Edizione 2 (June 2017)

Volume 39 (2017): Edizione 1 (March 2017)

Volume 38 (2016): Edizione 4 (December 2016)

Volume 38 (2016): Edizione 3 (September 2016)

Volume 38 (2016): Edizione 2 (June 2016)

Volume 38 (2016): Edizione 1 (March 2016)

Volume 37 (2015): Edizione 4 (December 2015)

Volume 37 (2015): Edizione 3 (September 2015)

Volume 37 (2015): Edizione 2 (June 2015)

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Volume 36 (2014): Edizione 4 (December 2014)

Volume 36 (2014): Edizione 3 (September 2014)

Volume 36 (2014): Edizione 2 (June 2014)

Volume 36 (2014): Edizione 1 (March 2014)

Volume 35 (2013): Edizione 4 (December 2013)

Volume 35 (2013): Edizione 3 (September 2013)

Volume 35 (2013): Edizione 2 (June 2013)

Volume 35 (2013): Edizione 1 (March 2013)

Volume 34 (2012): Edizione 4 (December 2012)

Volume 34 (2012): Edizione 3 (September 2012)

Volume 34 (2012): Edizione 2 (June 2012)

Volume 34 (2012): Edizione 1 (March 2012)

Dettagli della rivista
Formato
Rivista
eISSN
2083-831X
Pubblicato per la prima volta
09 Nov 2012
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

Volume 43 (2021): Edizione s1 (December 2021)
Special Edizione: Underground Infrastructure of Urban Areas

Dettagli della rivista
Formato
Rivista
eISSN
2083-831X
Pubblicato per la prima volta
09 Nov 2012
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

7 Articoli

Special Issue Article

Accesso libero

Forecasting the impact of buildings with multi-storey underground parts on the displacement of subsoil using modern numerical tools

Pubblicato online: 11 Dec 2021
Pagine: 479 - 491

Astratto

Abstract

The paper will analyse and review the experience to date in determining the impact range of implementation of deeply founded structures on the displacement of the subsoil in the vicinity.

With the background of these experiences, primarily empirical, the present possibilities of using numerical modelling to forecast the displacements of the terrain surface in various stages of works, that is, execution of deep excavation support systems, excavation-deepening phases with successive adding of struts, construction of underground levels and erection of the above-ground part of the building, will be presented.

Based on the results of own research, conclusions on the use of 3D numerical models in spatial shaping and designing the structure of underground parts of new buildings erected in dense urban development will be presented. The characterised 3D numerical models were verified, taking into account the actual results of geodetic measurements of the completed buildings.

Determining the range and forecasting the displacements of the subsoil are necessary for the design and implementation of investments due to the need to ensure the safety of erection and use of a new building and the buildings located within the area of influence.

Parole chiave

  • influence on neighbouring constructions
  • soil displacement
  • 3D numerical modelling
  • deep building foundations
  • buildings with multi-storey undergrounds
Accesso libero

Optimisation of absorber parameters in the case of stochastic vibrations in a bridge with a deck platform for servicing pipelines

Pubblicato online: 05 Dec 2021
Pagine: 492 - 500

Astratto

Abstract

The paper focuses on the problem of optimising the cooperation between a dynamic vibration absorber (DVA) and a structure. The authors analyse a road beam bridge equipped with a working platform (deck) used to service pipelines installed on the structure. The paper studies the problem of choosing the optimal parameters for damping absorbers that reduce the random vibration of a beam subjected to a random sequence of moving forces with a constant velocity. The stochastic properties of the load are modelled by means of a filtering Poisson process. A single-degree-of-freedom (SDOF) absorber model with a multi-degree-of-freedom (MDOF) primary structure model are is considered.

Parole chiave

  • urban network infrastructure
  • dynamic vibration absorber (DVA)
  • vibration effect
  • dynamic analysis
  • Poisson process
  • random vibration
Accesso libero

Analysis of the structure of liners used for the modernisation of brick collectors

Pubblicato online: 22 Dec 2021
Pagine: 501 - 509

Astratto

Abstract

Brick sewers were designed as egg-shaped, pear-shaped, bell-shaped, vaulted, and even rectangular (sometimes with granite ceilings and floor slabs). In exceptional cases, circular sections were also made of brick. Efforts were made in order to ensure optimal flow conditions, and also that the cross-section was adapted to the shape of the rock mass pressure line. This is due to the fact that the most advantageous shapes for masonry collectors are shapes in which no tensile stresses will occur in any part of the cross-section under the influence of external loads. Nevertheless, sewage conduits degrade over time. The boundary conditions of their use also change, which affects the magnitude of mechanical and hydraulic loads. Further use of a sewer in such a case requires its renewal, and less frequently, modernization that results from the necessity to change its function. This is usually done by introducing a new conduit into the interior of the renovated or modernized sewer, which in literature is called a liner.

The aim of the analysis was to determine the thickness of the liners that strengthen the structures of brick channels with an inverted egg cross-section and with dimensions of 1050 × 700 mm, which are intended for gravitational sewage systems. The analysis included the performance of variant static and strength calculations for the assumption that the conduit after its modernization will be replaced with a conduit operating in the pressure system, which is a very rare requirement.

It was assumed that the best solution would be to use a CIPP (Cured In Place Pipe) liner.

Parole chiave

  • brick sewer
  • renovation
  • CIPP liner
  • modernization of brick sewers
Accesso libero

Early-Age Thermal-Shrinkage Cracking in Deep Foundations

Pubblicato online: 16 Dec 2021
Pagine: 510 - 520

Astratto

Abstract

With the growing rate of urbanisation, deep foundations are playing an ever-larger role in the development of cities, reaching deeper than before to fulfil the requirements of new constructions. While current European standards include design procedures for structural and geotechnical design, they lack provisions for massive deep foundations with regard to early-age thermal effects. This paper presents aspects of the phenomenon especially important for deep foundations and discusses normative requirements that influence their thermal behaviour. Further, the paper describes the methods and results of the research carried out in the United Kingdom on 1.50-m-thick diaphragm walls of a deep circular shaft. Shaft features are described, as well as the materials used. The measurements were carried out using vibrating wire strain gauges coupled with temperature readings. The results presented refer to one of the test panels concreted in January 2020. The temperature results are analysed together with the influence of work scheduling on the readings. Strain results that indicate contractive behaviour of the test panel are investigated together with the possible causes leading to such readings. Plans and directions for future research are discussed.

Parole chiave

  • deep foundations
  • diaphragm walls
  • hydration heat
  • early-age thermal cracking
  • tremie concrete
Accesso libero

Analysis of the temperature effect on the stresses and deformations of GRP panels during the grouting process when using relining technology

Pubblicato online: 22 Dec 2021
Pagine: 521 - 531

Astratto

Abstract

The paper presents a numerical analysis of the behaviour of egg-shaped glass-reinforced plastic (GRP) panels during the grouting process when using short relining technology. The analysis was carried out for panels subjected to temperature changes. The temperature increase was caused by the heat of hydration of the grout. It was shown that temperature had a significant effect on the stresses occurring in the panels’ walls and also on their deformations. The analysis involved grout being added in a single stage and then in two stages for comparison. The distribution of stresses and deformations were examined for panels with different wall thicknesses that ranged from 12 to 20 mm. Extensive knowledge about the grouting process and the effect of temperature on the behaviour of GRP panels during the assembly stage when using short relining technology could make this non-disruptive technology more competitive with regards to the time of its implementation and its costs when compared to traditional methods.

Parole chiave

  • relining technology
  • GRP
  • grouting process
  • temperature
Accesso libero

An innovative rainwater system as an effective alternative for cubature retention facilities

Pubblicato online: 22 Dec 2021
Pagine: 532 - 547

Astratto

Abstract

The paper focuses on the possibilities of rainwater flow control in an innovative rainwater system which is equipped with a retention canals system. Sewage retention canal is a modern solution that provides effective retention of excess rainwater by using a capacity of sewer pipes and manholes. The retention is possible by using special damming partitions which have flow openings. The hydraulic working of the traditional rainwater system and the innovative rainwater system were compared with each other. The analysis was based on the results obtained from simulations using hydrodynamic modeling. Maximum possible values of rainwater outflow intensity from outlet nodes for the traditional rainwater system and the innovative rainwater system were discussed. On the basis of the analysis it was shown that the innovative rainwater system outweighs the classic rainwater one. It discharges two functions: transports and simultaneously retains excess rainwater in canals.

Parole chiave

  • Innovative rainwater system
  • sewage retention canal
  • rainwater retention
  • flow reduction
Accesso libero

Modern concrete pipes: a review of reinforcement and new technologies

Pubblicato online: 22 Dec 2021
Pagine: 548 - 557

Astratto

Abstract

The paper discusses existing reinforcement, future reinforcement and new technologies for concrete pipes used in the sewage systems. Concrete pipes currently in use and under investigation are reviewed. Structural fibres, as the main reinforcement of concrete pipes, are known as an attractive alternative to the traditional steel bars. Steel, synthetic and basalt fibres have been considered. The latest research and mechanical properties of individual fibres are presented. Advances in fibre-reinforced concrete provide a new basis for the design of more efficient concrete pipes, especially those resistant to biological corrosion and with a longer service life. In the article, future non-corrosive reinforcement due to the reduction of steel reinforcement and corrosion protection linings has been proposed.

Parole chiave

  • concrete pipe
  • underground structures
  • fibre
  • reinforcement
7 Articoli

Special Issue Article

Accesso libero

Forecasting the impact of buildings with multi-storey underground parts on the displacement of subsoil using modern numerical tools

Pubblicato online: 11 Dec 2021
Pagine: 479 - 491

Astratto

Abstract

The paper will analyse and review the experience to date in determining the impact range of implementation of deeply founded structures on the displacement of the subsoil in the vicinity.

With the background of these experiences, primarily empirical, the present possibilities of using numerical modelling to forecast the displacements of the terrain surface in various stages of works, that is, execution of deep excavation support systems, excavation-deepening phases with successive adding of struts, construction of underground levels and erection of the above-ground part of the building, will be presented.

Based on the results of own research, conclusions on the use of 3D numerical models in spatial shaping and designing the structure of underground parts of new buildings erected in dense urban development will be presented. The characterised 3D numerical models were verified, taking into account the actual results of geodetic measurements of the completed buildings.

Determining the range and forecasting the displacements of the subsoil are necessary for the design and implementation of investments due to the need to ensure the safety of erection and use of a new building and the buildings located within the area of influence.

Parole chiave

  • influence on neighbouring constructions
  • soil displacement
  • 3D numerical modelling
  • deep building foundations
  • buildings with multi-storey undergrounds
Accesso libero

Optimisation of absorber parameters in the case of stochastic vibrations in a bridge with a deck platform for servicing pipelines

Pubblicato online: 05 Dec 2021
Pagine: 492 - 500

Astratto

Abstract

The paper focuses on the problem of optimising the cooperation between a dynamic vibration absorber (DVA) and a structure. The authors analyse a road beam bridge equipped with a working platform (deck) used to service pipelines installed on the structure. The paper studies the problem of choosing the optimal parameters for damping absorbers that reduce the random vibration of a beam subjected to a random sequence of moving forces with a constant velocity. The stochastic properties of the load are modelled by means of a filtering Poisson process. A single-degree-of-freedom (SDOF) absorber model with a multi-degree-of-freedom (MDOF) primary structure model are is considered.

Parole chiave

  • urban network infrastructure
  • dynamic vibration absorber (DVA)
  • vibration effect
  • dynamic analysis
  • Poisson process
  • random vibration
Accesso libero

Analysis of the structure of liners used for the modernisation of brick collectors

Pubblicato online: 22 Dec 2021
Pagine: 501 - 509

Astratto

Abstract

Brick sewers were designed as egg-shaped, pear-shaped, bell-shaped, vaulted, and even rectangular (sometimes with granite ceilings and floor slabs). In exceptional cases, circular sections were also made of brick. Efforts were made in order to ensure optimal flow conditions, and also that the cross-section was adapted to the shape of the rock mass pressure line. This is due to the fact that the most advantageous shapes for masonry collectors are shapes in which no tensile stresses will occur in any part of the cross-section under the influence of external loads. Nevertheless, sewage conduits degrade over time. The boundary conditions of their use also change, which affects the magnitude of mechanical and hydraulic loads. Further use of a sewer in such a case requires its renewal, and less frequently, modernization that results from the necessity to change its function. This is usually done by introducing a new conduit into the interior of the renovated or modernized sewer, which in literature is called a liner.

The aim of the analysis was to determine the thickness of the liners that strengthen the structures of brick channels with an inverted egg cross-section and with dimensions of 1050 × 700 mm, which are intended for gravitational sewage systems. The analysis included the performance of variant static and strength calculations for the assumption that the conduit after its modernization will be replaced with a conduit operating in the pressure system, which is a very rare requirement.

It was assumed that the best solution would be to use a CIPP (Cured In Place Pipe) liner.

Parole chiave

  • brick sewer
  • renovation
  • CIPP liner
  • modernization of brick sewers
Accesso libero

Early-Age Thermal-Shrinkage Cracking in Deep Foundations

Pubblicato online: 16 Dec 2021
Pagine: 510 - 520

Astratto

Abstract

With the growing rate of urbanisation, deep foundations are playing an ever-larger role in the development of cities, reaching deeper than before to fulfil the requirements of new constructions. While current European standards include design procedures for structural and geotechnical design, they lack provisions for massive deep foundations with regard to early-age thermal effects. This paper presents aspects of the phenomenon especially important for deep foundations and discusses normative requirements that influence their thermal behaviour. Further, the paper describes the methods and results of the research carried out in the United Kingdom on 1.50-m-thick diaphragm walls of a deep circular shaft. Shaft features are described, as well as the materials used. The measurements were carried out using vibrating wire strain gauges coupled with temperature readings. The results presented refer to one of the test panels concreted in January 2020. The temperature results are analysed together with the influence of work scheduling on the readings. Strain results that indicate contractive behaviour of the test panel are investigated together with the possible causes leading to such readings. Plans and directions for future research are discussed.

Parole chiave

  • deep foundations
  • diaphragm walls
  • hydration heat
  • early-age thermal cracking
  • tremie concrete
Accesso libero

Analysis of the temperature effect on the stresses and deformations of GRP panels during the grouting process when using relining technology

Pubblicato online: 22 Dec 2021
Pagine: 521 - 531

Astratto

Abstract

The paper presents a numerical analysis of the behaviour of egg-shaped glass-reinforced plastic (GRP) panels during the grouting process when using short relining technology. The analysis was carried out for panels subjected to temperature changes. The temperature increase was caused by the heat of hydration of the grout. It was shown that temperature had a significant effect on the stresses occurring in the panels’ walls and also on their deformations. The analysis involved grout being added in a single stage and then in two stages for comparison. The distribution of stresses and deformations were examined for panels with different wall thicknesses that ranged from 12 to 20 mm. Extensive knowledge about the grouting process and the effect of temperature on the behaviour of GRP panels during the assembly stage when using short relining technology could make this non-disruptive technology more competitive with regards to the time of its implementation and its costs when compared to traditional methods.

Parole chiave

  • relining technology
  • GRP
  • grouting process
  • temperature
Accesso libero

An innovative rainwater system as an effective alternative for cubature retention facilities

Pubblicato online: 22 Dec 2021
Pagine: 532 - 547

Astratto

Abstract

The paper focuses on the possibilities of rainwater flow control in an innovative rainwater system which is equipped with a retention canals system. Sewage retention canal is a modern solution that provides effective retention of excess rainwater by using a capacity of sewer pipes and manholes. The retention is possible by using special damming partitions which have flow openings. The hydraulic working of the traditional rainwater system and the innovative rainwater system were compared with each other. The analysis was based on the results obtained from simulations using hydrodynamic modeling. Maximum possible values of rainwater outflow intensity from outlet nodes for the traditional rainwater system and the innovative rainwater system were discussed. On the basis of the analysis it was shown that the innovative rainwater system outweighs the classic rainwater one. It discharges two functions: transports and simultaneously retains excess rainwater in canals.

Parole chiave

  • Innovative rainwater system
  • sewage retention canal
  • rainwater retention
  • flow reduction
Accesso libero

Modern concrete pipes: a review of reinforcement and new technologies

Pubblicato online: 22 Dec 2021
Pagine: 548 - 557

Astratto

Abstract

The paper discusses existing reinforcement, future reinforcement and new technologies for concrete pipes used in the sewage systems. Concrete pipes currently in use and under investigation are reviewed. Structural fibres, as the main reinforcement of concrete pipes, are known as an attractive alternative to the traditional steel bars. Steel, synthetic and basalt fibres have been considered. The latest research and mechanical properties of individual fibres are presented. Advances in fibre-reinforced concrete provide a new basis for the design of more efficient concrete pipes, especially those resistant to biological corrosion and with a longer service life. In the article, future non-corrosive reinforcement due to the reduction of steel reinforcement and corrosion protection linings has been proposed.

Parole chiave

  • concrete pipe
  • underground structures
  • fibre
  • reinforcement

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