Tunneling projects encounter a variety of geotechnical problems. Jet grouting and soil mixing stabilize soft soils to allow TBMs to safely bore through them. Jet grouting and soil mixing create tangent or secant pile shafts for tunnel access. Jet grouting, chemical grouting and cement grouting stabilize soils around break-ins and break-outs and control groundwater. Anchors, shotcrete, and grouting techniques stabilize tunnel liners. Compaction grouting densifies loose soil under tunnel alignments, and helps relevel TBMs. Fracture grouting, chemical grouting, and compaction grouting control settlement of overlying structures during tunnel boring. Hayward Baker has experience with the full range of geotechnical construction techniques to solve a variety of tunneling issues.