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Jet Grouting

Jet Grouting

Jet Grouting

TERRATEST

The Jet Grouting process

The Jet Grouting process or Soilcrete is known as a soil-cement stabilisation. The soil around the bore is eroded with the aid of a high-pressure jet of water or cement suspension with a nozzle output speed 100 m/sec (possibly airborne). The eroded soil is rearranged and mixed in the cement suspension. The soil-cement mix is partly ejected into the annular space between the Jet Grouting rod and the bore. Different geometric configurations of Soilcrete elements are possible. The jet erosion distance varies according to the soil type and jet fluids used, and can reach diameters of up to 5 metres.

The Advantages of Jet Grouting

- Applicable to almost all soil types
- Individualised in situ treatment
- Designable strength and permeability
- Specific layer treatment
- Inert components only
- Vibration-free
- Applicable in limited working spaces
- Possibility of different Soilcrete elements
- Maintenance-free
- The safest and most direct sheetpiles method
- Able to operate around underground installations in servce
- Faster than alternative methods


REFERENCES

Jet Grouting
Bilbao Metro (Spain) Underground Line Works
Jet Grouting

The work involved the execution of a waterproof bottom slab with Jet-grouting columns, along the future track path situated between diaphragm walls performed for the excavation. Once the columns were tested, we proceeded to design the required distribution and type sections.

Jet Grouting
Madrid Metro (Spain) TBM Excavation
Jet Grouting

The soil improvement treatment executed by Jet grouting type I, was carried out to avoid possible terrain settling brought about by the TBM ground excavation during the execution of the metro tunnel. For that reason, Jet grouting columns with inverted V shape, were deployed in almost the whole surface to be treated, the only modification applied being the inclination of the columns.

Jet Grouting
Madrid Metro (Spain) TBM Excavation
Jet Grouting

The soil improvement treatment executed by Jet grouting type I, was carried out to avoid possible terrain settling brought about by the TBM ground excavation during the execution of the metro tunnel. For that reason, Jet grouting columns with inverted V shape, were deployed in almost the whole surface to be treated, the only modification applied being the inclination of the columns. A number of tests were carried out prior to the execution of the works, to ensure that the appropriate parameters influenced by the ground conditions were taken into account.

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