Discussion
Grouting is used in a jointed rock foundation chiefly to
Answer: D
Correct answer: reduce permeability along the joints
Grout injected under pressure fills the open joints and reduces the permeability of the rock mass, which is what a grout curtain beneath a dam is for. It also stiffens the mass somewhat by knitting the blocks together, but the primary purpose is watertightness. It does not alter the intact strength of the rock material, which is a property of the mineral fabric, and it does not remove the joints.
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