Project Description

Context of the project

This high-speed train line connects Hong Kong with Guangzhou in 48 minutes.

Description of the project

Bachy Soletanche Group Limited was part of the integrated consortium which was awarded Contract 811 A (Express Rail Link). The scope of works comprises the construction of a 300 metre long cut-and-cover tunnel in a dense urban environment.

Our solution

During the first phase, advanced utility and traffic diversion works were completed. In particular, a viaduct was completely dismantled and rebuilt at a different location. In the second phase, the geotechnical works which comprised an excavation of a 240,000 cu. metre “box” of 30 deep metre, was carried out. The third and last phase consisted in building the permanent reinforced concrete underground structure inside the diaphragm wall and a building to accommodate the mechanical and electrical rooms. The main technical difficulty of the project lies with the crossing of the existing metro line. This imposes a very specific sequence of works and limits the allowable settlement and displacements.

The existing line being founded on barrettes socketed into the rock, BSGL has proposed to re-use them to support the newly built structure. The final task, the load transfer from the old to the new structure, was a very delicate operation.

Type of project:

Railway infrastructure

Railway infrastructure



Subsidiary of Soletanche Bachy: 

Project owner:

Prime contractor:


Bachy Soletanche Group Limited – Laing O’Rourke

Works period:

03/2010 – 04/2016

Types of techniques:

Icon diaphragm wall

Diaphragm wall

Icon barrettes


Your country is: United States?

Key figures of the project

of cut-and-cover tunnel

Related techniques

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Around the world, close to you. Soletanche Bachy is rooted in your territories to provide you with the solutions of foundation and soil technologies adapted to your needs.

Your country is: United States ?