Tunnel
Tunnels have encountered every type of ground condition during construction, and can experience movement and water issues that can be remedied with geotechnical construction techniques. Jet grouting and cement grouting stabilize soft soils to facilitate boring operations through alignments and break-ins and break-outs. Compaction grouting stabilizes sinkholes that threaten tunneling operations, and can be used to realign TBMs that have become mired in soft soils. Fracture and permeation grouting stabilize ground above existing tunnels beneath structures for settlement control, or can be performed during tunneling operations for heave control, accompanied by computerized monitoring systems to monitor movement. Chemical and polyurethane grouting control groundwater for new or aging tunnels, and microfine cement grouting controls groundwater in weak sedimentary rock conditions. Compaction grouting, polyurethane and foam sand grouting fill abandoned tunnels. Existing and planned tunnels benefit from Hayward Baker’s experience.