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Numerical determination of load of a model tunnel lining, taking into account different heights of soil backfill

Szklennik Paweł

Archives of Civil Engineering

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2022

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Vol. 68, nr 3

289--305

EN

The paper presents an analysis of determining the load of a model tunnel lining in a noncohesive soil medium at two different heights of soil backfill above the structure. A series of simulations were performed with the flexible and rigid tunnel lining. The analysis was performed by conducting simulations with the use of an author’s program based on the discrete element method. The model previously calibrated on the basis of laboratory tests was used. The loads acting on the structure, the distribution of stresses in the surrounding soil medium and the displacements of this medium in the vicinity of the structure were determined and compared. The effect of soil weight and technological load applied from the surface was taken into account. The values of the numerically obtained loads of the tunnel lining were compared with those calculated according to the classic Hewett’s method. It has been proven that in both cases the degree of cooperation between the structure and soil is significantly related to the rigidity of the structure, hence the loads determined may differ significantly from the results obtained according to classical methods. It was shown that discrete modelling allows to reflect differences in the behaviour of the soil medium resulting from different heights of soil backfill. Smaller horizontal pressure was obtained in the side zones of an excavation at a higher backfill. In addition, significantly greater intensity of vertical soil displacements over the lining were observed with a lower backfill height.

PL

W pracy przedstawiono analizę wyznaczania obciążenia modelowej obudowy tunelowej w niespoistym ośrodku gruntowym przy różnych wysokościach nadkładu gruntu nad konstrukcją. W obu przypadkach przeprowadzono szereg symulacji przy konstrukcji obudowy wiotkiej i sztywnej. Analizy dokonano prowadząc symulacje z wykorzystaniem autorskiego programu opartego na metodzie elementów dyskretnych. Wykorzystano model skalibrowany wcześniej na podstawie badań laboratoryjnych. Określono i porównano obciążenia działające na obudowę, rozkład naprężeń w otaczającym ją ośrodku gruntowym oraz przemieszczenia tego ośrodka w otoczeniu konstrukcji. Uwzględniono działanie ciężaru gruntu oraz obciążenia technologicznego zadawanego z powierzchni. Wartości uzyskiwanych numerycznie obciążeń obudowy porównano z obliczonymi według klasycznej metody Hewetta.

2

Badanie przyczyn uszkodzeń podziemnego tunelu łączącego budynki Politechniki Lwowskiej

Nazarewicz B, Czeczin W.

Przegląd Budowlany

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2018

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R. 89, nr 7-8

78--81

PL

W referacie przedstawiono problemy związane z zabezpieczeniem przeciwwodnym tunelu podziemnego zlokalizowanego w Narodowym Uniwersytecie „Politechniki Lwowskiej” (NU „LP”). Opisano sposoby i podano wyniki przeprowadzonych badań. Na tej podstawie zaprojektowano rozwązanie materiałowo-konstrukcyjne prac hydroizolacyjnych.

EN

The paper presents problems related to the waterproofing of an underground tunnel located at the National University of Lviv Polytechnic. The methods are described and the results of the tests carried out are given. On this basis, a materials and structural solution for damp-proofing works has been designed.

3

Vibrations caused by train passages in underground tunnel compared to vibrations from ground surface transportation - some results of investigations

Stypuła K.

Archives of Civil Engineering

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2014

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Vol. 60, nr 2

269--286

EN

The paper describes experimental investigations of vibrations caused by train passages in the shallow underground tunnel (in Warsaw, Poland) in comparison to the results of measurements of vibrations from ground surface transportation (trams and buses). Propagation of surface ground vibrations from underground tunnel is presented. The problem of dynamic response of a building and influence of vibrations caused by underground on people residing in a building is discussed as well. The dynamic response of the building to underground vibrations is essentially different from the response of a building excited by surface sources of transport vibrations. Also the distribution of influence of the transport vibrations on people in the building is significantly different in both cases.

4

Selecting utilities placement techniques in urban underground engineering

Curiel-Esparza J., Canto-Perello J.

Archives of Civil and Mechanical Engineering

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2013

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Vol. 13, no. 2

276--285

EN

Placement of utilities has not been generally accomplished in any sustainable technique resulting in a veritable maze in high density urban areas. As underground space scarcity grows in our cities due to the increasing demands for utility services, subsurface facilities such as utility tunnels are becoming more efficient in providing the required infrastructure. There is a growing public awareness of aesthetic considerations and impatience with street cuts and their associated costs, traffic interferences, noise and accidental utility cuts. Unfortunately the lack of data and the difficulty in quantifying the intangibles has made it impossible to arrive at a reasonably accurate figure of overall negative impact on the urban environment of street cuts. Due to this, current practices of traditional trenching depending only on cost indicators remain as first option in urban planning instead of more sustainable techniques, like utility tunnels. However, it is well known that intangible costs to the public and the utilities might make the utility tunnel concept to be economically feasible in the long run. This paper presents a methodology based on AHP and Delphi processes for the selection of utilities placement techniques in which the intangibles are also assessed to avoid short-sighted urban underground planning.

5

Wzmocnienie betonowej obudowy podziemnych tuneli zbiorczych

Szulborski K., Michalak H., Pęski S., Przybysz P., Pyrak S.

Inżynieria i Budownictwo

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2010

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R. 66, nr 4

182-185

PL

Omówiono rozwiązanie konstrukcji dwóch tuneli o średnicy wewnętrznej 3200 mm, w których znajdują się magistrale wodociągowe średnicy 1200 mm. Przedstawiono stan techniczny tuneli po ponad 30-letniej eksploatacji. Podano rozwiązanie projektowe naprawy (uszczelnienia i wzmocnienia) oraz technologię jej wykonania i zastosowane materiały naprawcze.

EN

The paper is dedicated to two reinforced concrete with water mains located within their structure. These tunnels have been build under railway tracks - the property of Polish Railway Warsaw - and after more than thirty years of exploitation show various damages. The paper characterizes and diagnoses the reasons of those damages to tunnel structure, including description of proposed corrective and repair work technologies.

6

Koncepcje linii kolejowej wokół Morza Bałtyckiego

Anttikoski U., Vilo A.

Budownictwo Górnicze i Tunelowe

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2000

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nr 1

6-12

PL

Koncepcja rozwoju szybkiego transportu kolejowego w Europie przewiduje budowę trasy kolejowej wokół Morza Bałtyckiego. W opracowywanych dokumentach zakłada się, że połączenie kolejowe pomiędzy Estonią a Finlandią na odcinku Zatoki Fińskiej oraz pomiędzy Finlandią a Szwecją na odcinku Zatoki Botnickiej będzie prowadzone długimi tunelami podmorskimi. W artykule przedstawiono koncepcję budowy tuneli kolejowych pomiędzy Tallinem i Helsinkami.

EN

A concept of development of a fast rail transport connection in Europe envisages construction of a railway route round the Baltic Sea. A rail connection between Estonia and Finland is assumed in the documents that arc being prepared along the section of the Finnish Bay and between Finland and Sweden along the section of the Gulf of Bothnia. The route will be running through long section of undersea tunnels. The article presents a concept of the rail tunnels construction between Tallinn and Helsinki.