Single and two-component grout as high-performance backfilling materials

Segmental lining is not usually applied in hydraulic pressure tunnels but may become a viable alternative if it can withstand internal pressure variations and it is possible to fill the tunnel annular gap with high-performance backfilling material, as single-component grout or pea gravel. The resear...

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Bibliographic Details
Published in:Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World pp. 1241 - 1248
Main Authors: Di Giulio, A., Di Felice, M., Valiante, N., De Carli, G.
Format: Book Chapter
Language:English
Published: United Kingdom CRC Press 2023
Taylor & Francis Group
Edition:1
Subjects:
Unconfined Compression Test
High Durability Performances
High Range Water Reducer
Backfill Grout
Sodium Silicate
Geological Strength Index
ASTM C1437
Overburden
Uni En
Binder Ratio
ASTM D6910
Backfilling Material
Above Ground
Bedding Stiffness
UCS Value
Tangent Young's Modulus
BIM Model
Cyclic Compression Test
Maximum Local Velocities
ASTM E111
Supplementary Cementitious Materials
SEM
Ground Granulated Blast Furnace Slag
SCL
Fresh State's Properties
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Summary:Segmental lining is not usually applied in hydraulic pressure tunnels but may become a viable alternative if it can withstand internal pressure variations and it is possible to fill the tunnel annular gap with high-performance backfilling material, as single-component grout or pea gravel. The research here presented is aimed at studying a mix design for the backfill to be used in a pressure tunnel subjected to severe hydraulic conditions, considering both single and two-component grout. The requirements (high strength and stiffness, cyclic load resistance and durability) are quite common when considering a traditional grout but become challenging for a two-component one. The experimentation consisted in a preliminary phase to find mix designs that conjugated pumpability of the fresh mixture and mechanical properties of the hardened grout, followed by a testing phase on the best recipes, under static and cyclic loads. This paper presents a comparison between the two solutions.
DOI:10.1201/9781003348030-147