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White Papers Synopsis

​​Suction Compression Index based on CLOD Test Results

Authors: Robert W. Thompson, P.E., Howard A. Perko, P.E.

Synopsis: The objectives of the present investigation are to augment the validity of the empirical suction compression index relationship, and expand its applicability to relatively undisturbed samples from the Denver, Colorado area.


Comparison of Constant Volume Swell Pressure and Oedometer Load-Back Pressure

Authors: Robert W. Thompson. P.E., Howard A. Perko, P.E., and William D. Rethamel, P.E.

Synopsis: Swelling pressure is defined many ways and is dependent on the testing procedure. Along the Front Range area of Colorado, swelling pressure is usually determined using an oedometer and loading the sample after swelling.


Mitigating Hazard Due to Expansive, Steeply Dipping Bedrock and Flat-Lying Soil and Bedrock through Deep Sub-Excavation

Authors: Ronald M. McOmber, P.E., David A. Glater, P.E., C.P.G.

Synopsis: Deep sub-excavation is being widely used in the Denver area as a means to reduce risk of poor foundation and floor slab performance due to heave of expansive soil and bedrock. The method was first applied in the mid-1990s in expansive, steeply dipping bedrock in north-central Jefferson County, near Golden, Colorado.


Utilization of Compaction Grouting in Cohesive Soils to Stabilize and Re-level Distressed Tanks and Bins

Authors: Marc E. Cleveland, P.E., Joe Harris 

Synopsis: Study of three projects in the Midwest United States where compaction grouting was utilized to stabilize and re-level heavily loaded tank and bin structures founded on cohesive soils.​


Remediation of Settlement in Shallow-to-Deep Utility Trenches using Low Mobility Compaction Grouting Techniques in Cohesive Backfill

Authors: Marc E. Cleveland, P.E., Joe Harris, Rick Forsyth

Synopsis: Cohesive clay backfill in utility trenches might not always be uniformly compacted to project specifications and can experience excessive settlement over time. Utilities are usually installed beneath paved roadways. Settlement can effect the performance and drainage characteristics of the paved surface and in severe cases can be a safety issue. Patching and overlays can provide short-term solutions but do not address the long-term risk or ongoing maintenance costs. Mechanical removal, reworking or replacement of fill may not be efficient, practical, or economical, and may have risk of future movement if not properly constructed.