Rammed Aggregate Piers

a ground improvement system that uses compacted aggregate to create stiff pier elements.

are a patented/proprietary ground improvement system that uses compacted aggregate to create stiff pier elements.

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Vibro-Concrete Columns

used when the soil surrounding the column is very soft and compressible

were first developed in Europe as an alternative to stone columns when the soil surrounding the column is very soft.

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Deep Mixing Method

the blending of cement, lime, slag, and other binders to stabilize soil

involves the blending of cement, lime, slag, and/or other binders in powder or slurry form to stabilize soil in-situ.

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Column Supported Embankments

provide the necessary support by transferring the embankment load

can be placed through the soft ground to transfer the embankment load to a firm stratum.

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Forensics and Expert Witness Services

on over 75 geotechnical structures across North and South America

The Collin Group has performed forensic evaluations on over 75 geotechnical structures across North and South America.

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Excavation Support Systems

over 30 years of design and construction experience

Dr. Collin has been designing excavation support systems for over 30 years.

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Reinforced Soil Slopes

combine tensile inclusions with soil to create steep slopes

combine tensile inclusions (typically geosynthetic reinforcement) with soil to create steep slopes.

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Stone Columns

are commonly installed by water jetting or air jetting

are commonly installed by vibrating cylindrical probes into the ground to create an annular space that is filled with stone.

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Soil Nailing

the passive reinforcement of existing ground by installing closely spaced steel bars

is a top down construction technique consisting of reinforcing the ground with drilled and typically grouted steel bars.

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Mechanically Stabilized Earth Walls

consist of soil reinforced with either extensible or inextensible reinforcement.

consist of tensile inclusions (reinforcements) mixed with soil to create a composite material that is stronger than the individual components.

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Welcome to The Collin Group Web Site

Innovative Geotechnical Engineering

Dr. Collin founded The Collin Group, Ltd. in 1995. The firm specializes in soil-structure interaction, numerical modeling, earth retaining structure design, ground improvement, geosynthetics, mechanically stabilized earth and reinforced soil slopes, soil nailing, and forensic evaluation of geotechnical structures.