Hudson Geotechnics, Inc. (HGI)’s services are provided for projects in Southern California and nationwide; HGI’s personnel have experience over 30 years throughout the United States, for projects up to multi-billion-dollar developments, in a broad range of geotechnical engineering, geology, and ground motion evaluations

Site investigations

Drilling, sampling, cone penetration testing, geophysics, and geotechnical laboratory testing

Foundations

Analysis and recommendations for shallow, intermediate, and deep foundations for structures such as:

• high-rise buildings
• hospitals
• sports stadiums
• airport terminals
• infrastructure buildings
• pipelines
• bridges
• data centers
• commercial buildings

Slope stability evaluation

Including fill embankments and cut slopes

Groundwater and dewatering

Evaluation for basements and underground structures

Earth retaining structures

Geotechnical recommendations for earth retaining structures (permanent and temporary), including:

• soil nail walls
• tied-back soldier pile walls
• mechanically-stabilized earth (MSE) walls

Underground projects

Geotechnical engineering consultation for underground projects, including for:

• station excavation and shoring
• station design
• station seismic design
• tunnel seismic design
• tunnel construction and design

Instrumentation and monitoring

Geotechnical instrumentation and monitoring, including:

• InSAR satellite deformation monitoring
• automated total station instrumentation and monitoring
• slope inclinometer installation and monitoring
• tilt-gauge and crack meter instrumentation and monitoring

Geological mapping and evaluation

Mapping the surface and subsurface geology of a site to identify different rock and soil units, their properties, and any geological hazards such as faults, folds, and fractures

Geologic observations during construction

Observing geologic conditions to verify preconstruction explorations and closely map potential hazards

Geologic-seismic hazards assessment

Identifying and evaluating the potential for geologic hazards such as liquefaction, landslides, earthquakes, surface fault rupture, volcanic eruptions, seismic-induced settlement, subsidence, tsunamis, inundation, seiches, flooding, oil wells, methane gas, radon gas, and naturally occurring asbestos

Site-specific ground motion studies

Employing probabilistic and deterministic approaches, HGI assesses the expected earthquake ground shaking at the site based on regional seismicity and site soil and rock conditions.

Acceleration-time series development

Selection of appropriate earthquake records (acceleration-time series) from databases, considering their source mechanism, distance to the site, and recording station compatibility. These records are scaled or modified to match the site-specific response spectrum and used in non-linear analyses

Ground response analysis

Analyze the soil profile at the site to understand how it amplifies or deamplifies earthquake ground motions. This involves 1- or 2-dimensional models of the soil profile with propagation of seismic waves.

Partially non-ergodic ground motion studies

Instrumentation of the site (or using existing nearby broadband seismographs) to observe earthquakes and ambient vibrations to obtain site-specific path and site properties that improve accuracy over globally regressed ground motion models.

Seismic instrumentation

Deployment of sensors (typically 3-component broadband seismometers) and data acquisition systems to capture earthquake shaking and ambient vibrations to better understand regional and site seismic properties