Expertise

TUNNEL EXCAVATION METHODS

1. hard rock tunnel boring machines
2. soft rock open face shields
3. earth pressure balance machines
4. conventional drill and blast
5. pipe jacking and microtunneling
6. compressed air mining
7. roadheader mining

TUNNEL LINING AND TEMPORARY SUPPORT

1. cast-in-place concrete
2. single pass bolted and gasketed precast concrete and steel segments
3. new Austrian tunneling method
4. conventional methods including rock bolt, shotcrete and steel sets

GROUND MODIFICATION

1. permeation grouting
2. compaction grouting
3. ground freezing
4. dewatering
5. jet grouting
6. soil mixing

EXCAVATION SUPPORT AND SHAFTS

1. soldier pile and lagging
2. sheet piles
3. deep shafts
4. soldier pile and tremie concrete

MICROTUNNELING/AUGER BORING/HORIZONTAL BORING

1. underground pipeline
2. road crossings
3. water crossings
4. lake intakes and outtakes
5. specialty water supply installations

HORIZONTAL WELLS

1. fixed angle or guided (walkover or wireline)
2. jetting bits, shielded bits, mud motors, downhole hammers
3. surface to surface, blind, in-tunnel or between shafts
4. for contaminant clean-up, drainage or water supply
5. difficult soils (flowing sands, expansive clays)
6. various casing materials (carbon steel, SS, lightweight SS, HDPE, HTPE, PVC, fiberglass), perforation, filter and connection styles
7. shelter casing or direct installation
8. for groundwater extraction, air sparging, hot air injection, soil vapor extraction and drainage
9. specialty techniques such as hydraulic fracturing of low permeability soils from the wellbore.
10. water sampling

GEOTECHNICAL ANALYSIS

1. finite element analysis
2. geotechnical instrumentation

WINE CAVES

1. wine cave design

DOCUMENT ADMINISTRATION

1. project website development and maintenance
2. document administration and management