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Geotechnical & Geo-environmental Engineering is our core service and includes the following applications:

• Site investigations;

• Establishing the geotechnical criteria for foundation support and retrofit; 

• Underpinning Design  

• Design of Excavation Support Systems (sheet piling, soldier beam and lagging, diaphragm walls, secant pile walls) 

• Geotechnical criteria for utility crossings beneath existing embankments or structures (Jack and Bore, Directional Drilling);

• Dewatering during construction, and permanent underdrains;

• Establishing the geotechnical design criteria for soft and hard ground tunneling;

• Ground Improvement Design (Dynamic Compaction or Replacement, Preload, and surcharge, Design of Column Supported Embankment, Stone columns, stabilization with lime or cement, compaction grouting)

• Geotechnical design of bulkheads;

• Geotechnical Earthquake Engineering (Site Specific Response Spectra, Site Class, Assessment of Liquefaction Potential and Lateral Spreading);

• Analyses of slope stability of cuts in soil and rock including soil nail and shotcrete stabilization design, and rock bolting design;

• Value Engineering 

• Geotechnical Instrumentation (Inclinometers, Piezometers, Earth pressure cells, Tilt meters, and crack gauges) 

• Geotechnical observation (Inspection Services) for compliance with the criteria for site preparation, pile load tests, earth fills, and ground improvement designs. Oweis is a certified Class A inspection by NYCDOB.  

• Expert reports and testimony related to post-construction performance