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Modern Pre-Excavation Grouting for Underground Structures in Rock
The pre-grouting method or grouting ahead of the excavation face in underground construction in rock can offer significant advantages in many situations. This is particularly the case in difficult rock conditions such as water ingress or mechanically difficult rock, in which pre-grouting can contribute to avoiding problems and serious delays. Modern cost-effective methods and material technology for pre-grouting in underground construction aims to achieve the desired result as quickly as possible, hence reducing the down time during excavation as much as possible. Collapses at the tunnel face or unexpected high water inrushes are not uncommon experiences when tunnelling in geologically difficult rock conditions such as fault zones in alpine terrain or tunnels with shallow location influenced by weathering or low rock stresses. Tunnelling in urban areas often involve shallow location of tunnels, proximity to existing underground structures, as well as establishing connections between underground structures. The consequences of a groundwater drawdown or deformations in the ground caused by collapses are unacceptable due to the possible impact on buildings with sensitive foundations. This paper addresses the issue of how modern pre-grouting can strongly reduce the risk of problems and offer a cost-effective reduction of water ingress into tunnels. The state-of-the art technology of rapid hardening micro-cements and liquid colloidal silica is particularly emphasized. This technology can improve the cost-effectiveness and technical feasibility of tunnelling in sensitive environment in difficult rock conditions significantly.
Modern Pre-Excavation Grouting for Underground Structures in Rock
The pre-grouting method or grouting ahead of the excavation face in underground construction in rock can offer significant advantages in many situations. This is particularly the case in difficult rock conditions such as water ingress or mechanically difficult rock, in which pre-grouting can contribute to avoiding problems and serious delays. Modern cost-effective methods and material technology for pre-grouting in underground construction aims to achieve the desired result as quickly as possible, hence reducing the down time during excavation as much as possible. Collapses at the tunnel face or unexpected high water inrushes are not uncommon experiences when tunnelling in geologically difficult rock conditions such as fault zones in alpine terrain or tunnels with shallow location influenced by weathering or low rock stresses. Tunnelling in urban areas often involve shallow location of tunnels, proximity to existing underground structures, as well as establishing connections between underground structures. The consequences of a groundwater drawdown or deformations in the ground caused by collapses are unacceptable due to the possible impact on buildings with sensitive foundations. This paper addresses the issue of how modern pre-grouting can strongly reduce the risk of problems and offer a cost-effective reduction of water ingress into tunnels. The state-of-the art technology of rapid hardening micro-cements and liquid colloidal silica is particularly emphasized. This technology can improve the cost-effectiveness and technical feasibility of tunnelling in sensitive environment in difficult rock conditions significantly.
Modern Pre-Excavation Grouting for Underground Structures in Rock
Hognestad, H. O. (author) / Holter, K. G. (author)
Proceedings of the Fourth International Conference on Grouting and Deep Mixing ; 2012 ; New Orleans, Louisiana, United States
Grouting and Deep Mixing 2012 ; 890-902
2012-08-17
Conference paper
Electronic Resource
English
Grouting , Highways and roads , Chemical grouting , Anchors , Cement , Excavation , Cutoffs , Piles , Mixing , Underground structures , Rocks , Foundations , Hydraulic structures
Modern Pre-Excavation Grouting for Underground Structures in Rock
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