Red Line Tel Aviv: Planning and Constructing the
TBM Tunnels of the Eastern Section (Part 2)

The Red Line is the first line of the Tel Aviv urban railway. 2 x 2.7 km tunnels were driven using two EPB tunnel boring machines from Herrenknecht for the eastern section of the Red Line. It is being built by a consortium comprising the Israeli construction company Danya Cebus and the Chinese contractor CCECC. The WBI GmbH undertook the detailed design and accompanied construction activities on behalf of the joint venture. This report follows up on the previous one that was published in tunnel 4/2019. It deals with the appropriate mix composition of the annular gap grout and the driving activities in the tunnel sections in clay and Kurkar.

6 Annular Gap Grout

A cement-based mortar was used for grouting the annular gap for tunnelling the eastern section of the Tel Aviv Red Line [2]. The mixes applied are presented in Table 1. The grout properties were tested in the lab at the WBI-Center.

The fresh mortar has a density of 2.1 g/cm³. Workability was proven by means of slump tests, in which horizontal slumps of roughly 50 to 60 cm could be achieved on up to 6 h old samples.

The deformability of the annular gap mortar in its fresh state is of decisive importance for dimensioning the segmental lining. Therefore, oedometer tests were...

Related articles:

Issue 07/2016 Research and Development

New Test Stand for annular Gap Mortars

A qualitatively high-grade tunnel lining requires the tunnel segment annular gaps to be properly grouted. At the same time, this provides a decisive contribution to a high rate of advance during...

Issue 06/2021

Requirements for Annular Gap Mortar for TBM Driven Tunnels With Single Segmental Lining

1 Introduction In TBM driven tunnels, the segmental lining is installed inside the shield. With the aid of the jacks, the finalized segmental ring is pressed against the already installed rings and...

Issue 04/2020

Test Methods for Simulating the Solidification Process of Annular Gap Backfilling Materials

1 Introduction 1.1 Necessity of the Annular Gap Backfilling In mechanized tunnelling a gap remains between the segmental lining and the excavated ground – the annular gap – that must be completely...

Issue 07/2017

Porous Annular Gap Grout in Shield Tunnelling

Test Procedures for the Assessment of Durability under Sulphate Exposure

The current article presents the results and conclusions regarding investigations of the durability of a cement-based, porous annular gap filling material, which were part of a master thesis at the...

Issue 03/2016

New Development of an Annular Gap Mortar for mechanized Tunnelling

1 Introduction and Motivation During mechanized tunnelling employing shield driving machines, the prevailing soil is removed at the face by means of a cutting wheel. The surrounding soil is supported...