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Stabilization by injection of grouts

Short answer

Grouting injects fluid grout (cement, chemical, etc.) under pressure into soil voids to bind particles, reduce permeability and increase strength. Advantages: increases bearing capacity, reduces settlement, controls seepage, works in confined spaces with minimal vibration.

Describe the soil stabilization by injection of suitable grouts with its advantages.

Grouting is the injection of a fluid material (grout) under pressure into soil voids, fissures or cavities. The grout then sets or gels, binding the particles, reducing permeability and increasing strength.

Types of grout:

  • Cement grout: cement-water mixture for coarse sands, gravels and fissured rock.
  • Clay or bentonite grout: for sealing and filling voids.
  • Chemical grout: sodium silicate, acrylamide or resins, which have low viscosity and penetrate fine sands.
  • Bituminous grout: used for sealing.

Method: holes are drilled or pipes driven to the required depth, and grout is pumped in stages at controlled pressure until refusal, so that the grout permeates the soil without fracturing it.

Advantages:

  1. Increases bearing capacity and reduces settlement.
  2. Reduces permeability, so it controls seepage under dams and in excavations.
  3. Can be done in confined spaces, with little vibration or disturbance to existing structures.
  4. Underpins existing foundations without excavation.
  5. Fast and works at any depth.

✓ Answer checked by Claude Sonnet 5.5

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