GTI is prepared to meet all your engineering needs by performing high quality work in a timely and cost effective manner, specific to your projects needs. These services, available to our clients throughout the United States and internationally.
Services include, but are not limited to the following:
Drilling
With our highly experienced professional staff of engineers, geologists, scientists, and technicians, GTI can perform a wide range of geotechnical testing. Testing includes standard penetration testing, as well as undisturbed ring sampling, vane shear testing, and cone penetrometer testing. Additionally, GTI also performs rock coring, including RQD testing, nuclear and cross-hole seismic testing. GTI can provide a wide variety of equipment to meet your geotechnical needs including, but not limited to:
Seismic Refraction
GTI’s experienced staff of engineers and geologists can perform Seismic Refraction Studies for difficult to reach and/or remote locations as a cost effective alternative to conventional drilling services. The seismic refraction method consists of measuring (at known points along the surface of the ground) the travel time of compressional waves generated by an impulsive energy source. The energy source utilized consists of a 12-pound sledgehammer, which is detected by 12 separate geophones, then amplified and recorded by a seismograph. Measurements of time and distance are recorded and plotted on a graph, from which the depth of various layers can be determined along with their individual velocities.
From the seismic wave velocities, GTI engineers can extrapolate geotechnical design parameters such as dry density, angle of internal friction and soil cohesion. This method is especially useful in archaeologically and environmentally sensitive areas. Widely utilized by the telecommunication industry for monopole and lattice tower foundation design in elevated, mountainous areas; this method is also eapplicable to custom home and commercial structure foundation design.
Geophysical Services
GTI is prepared to provide several geophysical, non-destructive testing services to suit sensitive and/or difficult subsurface exploration needs. GTI utilizes geophysical engineering for various foundation designs, site risk assessments, and site suitability studies. Whether designing a deep foundation system, determining depth to groundwater, or searching for earth fissures, the wide array of geophysical engineering services offered by GTI can meet your needs. These geophysical services offered by GTI include, but are not limited to:
Laboratory Services
GTI’s full service laboratory is certified by AMRL, CCRL, AASHTO, the City of Phoenix and ADOT for various laboratory tests of soils, concrete, and asphalt. Laboratory testing services for geotechnical studies offered by GTI include, but are not limited to:
