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Grouting to fill the voids and empty spaces in the back of tunnel lining is referred to as contact grouting. Contact groiuting is in particular important in segmental tunnel linings by contributing to the structaral stablity of the bored ground and reducing groundwater leakage into the tunnel. After defining various type of grouting, the article explains contact grouting, typical grout mixes, adminxtutres, quality control tests and injection processes. For more information contact info@geoengineeringltd.com
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