2. S-Bahn-Stammstrecke München – Besondere geotechnische Untersuchungen für ein herausforderndes Innenstadtprojekt/Munich’s second core S-Bahn route – special geotechnical investigations for a challenging inner-city project

Sailer, Martin; Fillibeck, Jochen; Loga, H; Kretschmer, Markus

doi:10.37544/0005-6650-2017-07-08-65

Bauingenieur

2017

DOI: 10.37544/0005-6650-2017-07-08-65

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2. S-Bahn-Stammstrecke München – Besondere geotechnische Untersuchungen für ein herausforderndes Innenstadtprojekt/Munich’s second core S-Bahn route – special geotechnical investigations for a challenging inner-city project

Martin Sailer¹,

Jochen Fillibeck²,

H Loga³

et al.

Abstract: Die 2. S-Bahn-Stammstrecke München ist ein Projekt mit besonderen geotechnischen Herausforderungen. Die Grenzen bisheriger Erfahrungen in München werden mit den geplanten Baumaßnahmen – insbesondere den über 40 m tiefen Baugruben oder den circa 340 m² großen Spritzbetonvortrieben an den Haltepunkten Hauptbahnhof und Marienhof – überschritten. Derartige Baumaßnahmen führen zu außergewöhnlichen Fragestellungen, zu deren Klärung für die 2. S-Bahn-Stammstrecke München verschiedene geotechnische Sonderuntersuchunge… Show more

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Indexversuche zur Bestimmung der Abrasivität von Lockergestein

Drucker,

Feinendegen,

Holzhäuser

et al. 2024

Geotechnik

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Die Abnutzung von Werkzeugen kann insbesondere im Spezialtief‐ und Tunnelbau einen relevanten Kostenfaktor darstellen, der möglichst bereits vor Bauausführung prognostizierbar gemacht werden soll. Dabei sind jedoch unterschiedliche Faktoren, etwa das Verschleißpotenzial des Baugrunds, die Werkzeugeigenschaften, aber auch die Baumethode, die Ausführungsbedingungen sowie weitere Projektgegebenheiten zu berücksichtigen. Der DGGT‐Arbeitskreis 1.11 „Verschleiß und Verklebung“ arbeitet an Empfehlungen, u. a. zur Bewertung des Verschleißpotenzials von Lockergestein. In diesem Zusammenhang wurden mehrere Indexversuche identifiziert, die zur Bestimmung der Abrasivität von Böden herangezogen werden können, wobei jedoch zu berücksichtigen ist, dass Laborergebnisse nicht immer die realen Baugrundverhältnisse widerspiegeln. Die vorgestellten Versuchsmethoden decken unterschiedliche Korngrößenbereiche ab, eine Kombination der Versuche ermöglicht die Charakterisierung der Abrasivität von weitgestuften und gemischtkörnigen Lockergesteinen.

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Indexversuche zur Bestimmung der Abrasivität von Lockergestein

Drucker,

Feinendegen,

Holzhäuser

et al. 2024

Geotechnik

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Calculation of the foundation settlement during compensation grouting

Luzin

Ermoshina

2019

E3S Web Conf.

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The article presents the issue of correctly calculating the SSC of the foundation bases in the process of compensation grouting. It is shown that the numerical calculation should be performed in two versions: hydrostatic pressure and rear volume strain in a cluster of soil. Using the example of an object in Moscow, the use of the PLAXIS 3D design complex was shown to calculate additional precipitation of buildings during compensation grouting and the passage of a tunnel under it. A method is given for determining the required volume of suspension during compensation grouting using numerical methods for calculating the SSC.

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Effects of Jack Thrust on the Damage of Segment Lining Structure during Shield Machine Tunnelling

Xu,

Chen,

Zhong

et al. 2023

Buildings

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Constructing a tunnel with a large longitudinal slope and a small-radius sharp curve is challenging. During the construction process, it necessitates a series of intricate operations, including adjusting the horizontal and vertical posture of the shield machine, controlling the tunnelling thrust, and consistently ensuring the appropriate over-excavation amount inside and outside of the turn. Improper operations can easily induce undue stress on the segments. This study establishes a finite element numerical model of lining segments subjected to jacking force under various construction conditions. The concrete damage plasticity (CDP) constitutive model was used to characterize the mechanical behavior of concrete under load. The mechanical characteristics and damage behavior of segments under construction conditions, such as significant thrust escape, vertical attitude adjustment of the shield machine, excavation in soft and hard interbedded strata, line turning, sudden failure of the propulsion system, and eccentricity of brace boots, were analyzed. The results revealed that, when advancing according to the maximum thrust design value (50 MPa), cracks in the tensile plastic damage zone near the brace boot plate and the edges of the segment can develop. This can lead to localized corner failure of the concrete at the lining’s edge. Therefore, it is recommended that the jack’s thrust value should not surpass 30 MPa. Maintaining the usual uneven jack thrust state of shield tunnelling along the design axis is unlikely to result in segment concrete cracking. Damage to the segment caused by the eccentricity of the brace boot plate is the most severe; hence, avoiding the eccentricity of the brace boot plate during construction is crucial. The findings of this research can guide the control of jack thrust during shield tunnelling construction and offer insights into the design of segment parameters.

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2. S-Bahn-Stammstrecke München – Besondere geotechnische Untersuchungen für ein herausforderndes Innenstadtprojekt/Munich’s second core S-Bahn route – special geotechnical investigations for a challenging inner-city project

Cited by 3 publications

References 0 publications

Indexversuche zur Bestimmung der Abrasivität von Lockergestein

Indexversuche zur Bestimmung der Abrasivität von Lockergestein

Calculation of the foundation settlement during compensation grouting

Effects of Jack Thrust on the Damage of Segment Lining Structure during Shield Machine Tunnelling

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