Tunnel ground improvement | VSL-Intrafor specialized leader

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NEW STRUCTURES
Transport infrastructure
As a specialist of structural systems and ground engineering, we provide bespoke solutions combining design and methods, in-house systems and project execution for the construction of transport infrastructure worldwide.
Ground engineering, post-tensioning, heavy lifting…: discover our solutions to cater for a complex architecture, difficult site conditions, accelerated schedules and more.
Industrial & energy-producing structures
As a specialist of structural systems and ground engineering, we provide bespoke solutions combining design and methods, in-house systems and project execution for the construction of industrial and energy-producing structures worldwide.
Existing Structures
We deliver bespoke inspections, preservation plans and maintenance operations to manage the ageing of structures and optimize their safety, durability and asset value.
As specialists of structural components, we specialise in the repair or replacement of parts of an asset that are essential to guarantee continued safe use. The repair or replacement of parts of an asset due to structural deterioration is essential to maintain or reinstate it in a condition that guarantees continued safe use. As specialists of structural components, VSL helps owners and asset managers to define a tailored-made solution balancing cost, safety, continuity of service, performance and durability.
- Repair
- Replacement
We offer structural modification solutions to accommodate new uses or requirements that help maintain a structure’s value, comply with the latest design codes and safety recommendations or answer to new needs.
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Tunnel ground improvement: What is at stake?

The construction of tunnels in poor soil or in varied soil conditions provides for a variety of unique challenges. When building a metro or irrigation tunnel, it is necessary to account for:

The structural sustainability against water pressure,

The soil reinforcement using grout injections and clouting (if a tunnel is built with a traditional method).

The cross-passages to create connections between two tunnels,

Adequate protection for the surrounding buildings and underground infrastructure networks along the tunnel

Convergence areas between two tunnels: where ground stability is concerned, it is of absolute necessity to make sure that the construction of one tunnel will not impact the construction of the other.

How VSL can help you

VSL-Intrafor has extensive experience in all ground improvement solutions – even when complex in nature (depth, complicated environmental setting).
The solution depends on structural requirements or existing soil conditions:

grouting,
jet grouting,
stone columns,
vibro-compaction,
ground freezing.

VSL Intrafor manages over 400 pieces of specialized equipment including ground improvement machinery such as vibroflots, stone columns equipment, grouting pumps and jet grouting pumps.

What are the VSL tunnel ground improvement solutions?

A Design & Build package, including specialized equipment.

Ground Improvement Brochure

Discover our Case Studies

Here is a selection of our references.

HONG KONG, Hong Kong

2015 -2016

HONG KONG, Hong Kong

2017 – 2018

SEE ALL CASE STUDIES

Solutions that can be combined with ground improvement

Horizontal directional coring

Construction of underground metro stations

Tunnel Access or ventilation shafts

Tunnel Box Jacking

Cut and cover tunnel