CUED Publications database

Increasing allowable deformation criteria through application of level II LTSM approach

Mortier, H and Jonker, JH and Rots, JG and Hobbelman, GJ and Giardina, G and Hendriks, MAN (2013) Increasing allowable deformation criteria through application of level II LTSM approach. In: World Tunnel Congress WTC, 2013-5-31 to 2013-6-7, Geneva, Switzerland.

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In the central part of the Delft railway tunnel project, an underground railway station is being built at very close distance to the existing station building, which is still in operation. Although elaborate sensitivity analyses were made, some unforeseen deformations were encountered during the first phases of the execution process. Especially the installation of temporary sheet pile walls as well as the installation of a huge amount of grout anchor piles resulted in deformations exceeding the predicted final deformations as well as the boundary values defined by a level I limiting tensile strain method (LTSM) approach. In order to ensure the execution process, supplementary analyses were made to predict future deformations, and this for multiple cross sections. These deformations were implemented into a finite element model of the masonry of the building in order to define probable crack formation. This Level II LTSM approach made it possible to increase the initially foreseen deformation criteria and the continuation of the works. Design steps, design models and monitoring results will be explained within this paper.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Structures
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 20:14
Last Modified: 26 Apr 2018 02:00