Geotechnical Partnership, Inc.

Providing geotechnical engineering and testing services to the New England design and construction community.

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Engineering Services:

Site Investigation and Subsurface Exploration:

Site subsoil and groundwater sampling and testing is undertaken to gather raw data for design of foundations, tunnels, dams, and earth retaining walls, as well as for specialty methods (soil nailing, jet and compaction grouting, other ground improvement etc.).

Basic field equipment includes ATV and truck mounted soil and bedrock drilling rigs, excavators, specialized drilling equipment and geotechnical testing equipment trucks.

We provide an unusual combination of field personnel to complete your project efficiently within a reasonable budget:

  • A geotechnical engineer is on-site throughout soil sampling to provide field testing, computer data logging and preliminary engineering analysis. The engineer has a minimum of 30 years of PE level geotechnical engineering experience and will carry your project through to completion.

  • A senior level geotechnical technician is on-site to provide specialized soil testing (e.g. field soil particle gradation, unconfined compression (UC), soil electrical resistivity etc.). Field data collected is computer ready for direct recording plotting and analysis.

  • Deep drilling and soil sampling is performed by drilling crews we have trained and worked with for a minimum of 14 years.

Backhoe excavations can also be arranged for inspection of specific underground strata or structures.

Geotechnical Soil-Structure Analysis:

  • Soil Improvement Systems: Conventional methods of site improvement (excavation of problematic bearing soils and replacement with engineered fills) are often not practicable or economic. Soil improvement methods such as arrays of aggregate piers allow shallow foundation systems to be installed economically. This is particularly economic for contaminated sites. We perform settlement analysis including computer aided design with Settle 3D.

  • Intermediate and Deep Foundation Systems: Alternatives include friction and end-bearing pile systems: timber piles, steel H-piles, pipe piles, concrete piles, cast-in-place piles, helical (screw) piles, pressure injected footings (PIFs), and lightweight piles (e.g. ductile iron piles; plastic piles). Computer assisted design includes use of GRL WEAP, a finite element analytic approach.

  • Slope Stability Analysis: With the increasing scarcity of level, buildable sites, analysis of the stability of earth slopes has become increasingly necessary. We utilize Slide 5.0 (slip surface analysis) and Phase 2 (finite element analysis) to assist in slope stability determination.

  • Earth Retaining Structures: As sloping sites are more commonly built upon, they require temporary or permanent earth retention structures to provide a buildable area. Common retaining structures include: steel and timber sheeting, jet grouting, MSE walls, bin walls, soil nail walls, and conventional gravity retaining walls. We provide computer generated analysis utilizing Phase 2 (for many wall types) and GoldNail (for soil nail walls).

Field Monitoring and Testing of Earthwork and Specialty Systems:

  • General Earthwork and Shallow Foundations: Nuclear Field Compaction Testing of bearing of foundations, grade slabs and roads.

  • Aggregate Piers: Pier Modulus Tests, Pier Stabilization Tests, and Pier Diameter Confirmation.

  • Pile Foundations: Pressure Injected Footing Base Formation Monitoring; Pile Load Tests; End-Bearing Pile Set Confirmation; Friction Pile Adhesion Confirmation.

  • Soil Nail Walls; Tiebacks and Tiedowns: Performance Tests; Proof Tests; Installation Monitoring

  • Adjacent Structure Movement Instrumentation: Level Surveys, Tell-Tales, and Inclinometers

Laboratory Soil Testing:

Soil Tests available at the Geotechnical Partnership, Inc. Soils Laboratory:

  • Granular Soils:

    • Moisture Content

    • Particle Gradation Test (Sieve)

    • Proctor Tests (ASTM D1557; D698)

    • Direct Shear Test (DS)

    • Soil Resistivity (Box)

  • Cohesive Soils:

    • Moisture Content

    • Atterberg Limits Test (LL, PL, PI)

    • Unconfined Compression Test (UC)

    • Oedometer (Consolidation) Test

Our Typical Project Involvement, by Project Phase:

  • Geotechnical Engineering Site Evaluations with Design Recommendations.

  • Project Structural Drawing Review.

  • Construction Specification Preparation (e.g. Earthwork; Sheeting & Shoring; Specialty Systems)

  • Specialty Contractor Submittal Review

  • Construction Phase Monitoring and Testing with Daily Field Reports (Earthwork and Specialty Systems)

Specialty Services:

  • Engineering design and hand calculations for aggregate pier systems.

  • Field installation monitoring for aggregate pier installation (QC or QA)

  • Liquefaction mitigation sites: geotechnical design and field monitoring.