Grouting

RIX offers high quality grouting services. Grouting is the injection of grout material under pressure into rock mass, soil mass or a structure to improve its mechanical properties.

Grouting is one of the primary solutions for ground improvement. There are several types of grouting operations for different applications:

  • Permeation grouting (Microfine/Chemical Grouts/GP)
  • Compaction grouting
  • Dam grouting
  • Fracture grouting (compensation)
  • Jet grouting
  • Seepage grouting in structures

Permeation Grouting

Injection of grout into cavities, pores and fractures of subsoil to produce a coherent, high strength and reduced-permeability grouting zone without displacing or changing soil structure. This method is known as Contact Grouting when performed around tunnels and shaft linings to fill the gap between rock surfaces and linings.

Consolidation (Compaction) Grouting:

The injection of grout into discontinuities and cavities to consolidate a layer of the foundation, resulting in greater impermeability and/or strength and less deformability. Consolidation grouting is normally referred to as Blanket Grouting in dam engineering. Compaction grouting is a term for consolidation grouting in a soil mass. Consolidation grouting is commonly used in long wall and other mining methods to fill the empty space between the ground surface and coal mine roof and prevent subsidence of strata.

Dam Grouting:

Dam grouting is the pressure filling of fractures and discontinuities in rock to produce water tightness and strengthen the rock. The grout curtain is mainly installed under the dam foundations, in dam abutments and around the tunnels, shafts and other structures, constructed by drilling and grouting closely-spaced drill holes oriented to optimize the intersection of rock joints. Although curtain grouting will not fully stop water leakage under the dam foundation or at the abutments, it may substantially reduce the rock mass permeability.

Fracture Grouting (Compensation):

Fracture grouting is filling artificially-created or natural cavities in the rock mass with a high-pressure injection of cement-based grout. In fracture grouting, structure of voids and discontinuities is changed remarkably.

Jet Grouting:

Jet grouting uses high-pressure and high-velocity jets to erode, mix and partially replace the in-situ soil or weak rock with cementitious grout slurry to create an engineered soil-cement product of high strength and low permeability. Jet grouting can be performed above or below the water table and in most subsurface stratigraphies, from cohesionless soils to highly plastic clays. The three basic systems in general use are single-fluid, double-fluid and triple-fluid jet grouting.

Seepage Grouting in Structures:

Grouting can be carried out to seal water paths into cracks and joints in the floors, walls or rooves of structures. Cementitious grouts or chemical grouting may be used in various conditions, including subways, tunnels, underground chambers and basements.

RIX has a specialized team for executing various types of grouting works. Using high pressure grouting pumps, mechanical and inflatable packers and a variety of grouting tools, our team is capable of performing grouting operations in difficult rock and soil conditions, from ground surface level to very deep stages. RIX has completed some challenging jobs including dam sites and culverts. One of our most recently completed grouting projects is the installation of a grout curtain under the Copeton Dam spillway in mid-2012. We have received very positive feedback from our clients.

Besides pressure grouting at various depths, our team is capable of performing related activities such as grout mix design, injection of microfine cement, water pressure testing (Lugeon Test), core drilling and logging.

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