Dynamic Compaction of Hard Rock and Shales

  • Hopkins, Tommy (PI)

Grants and Contracts Details


OBJECTIVES: The major objective of this study is to examine the effectiveness of new impact compactors for breaking down and compacting mixtures of hard rocks and soft shales. The value of using this type of equipment for compacting highway subgrades will be examined. A draft specification and construction methods will be provided for possible use on demonstration projects. In the future, the study may examine the effectiveness of the new equipment for compacting other embankment materials, such as durable and non-durable shales and different types of soils. BACKGROUND: Achieving good compaction of embankment mixtures containing soft clayey shales and hard slabs of limestone, such as interbedded layers of materials ITom the Kope Geological Formation, is a major problem in many areas of Kentucky. Failure of conventional equipment to achieve good compaction of mixtures of soft and hard materials has led to numerous landslides and settlement failures, which has cost millions of dollars in repairs. This new, innovative compaction technology has the potential to vastly improve the engineering behavior of compacted materials and can lead to large savings to the Cabinet in constructing new roadways, as well as reconstructing old highways. Techniques and experience needs to be developed so that this technology can be evaluated and implemented. Reduced water content requirements and increased lift thickness may lead to large savings to contractors and the Cabinet. Large increases in the strengths of materials would decrease settlements and prevent, or minimize, instability problems. The dynamic compactors appear suitable for breaking down and compacting clayey shales. FY 2007 PROPOSED WORK: It is anticipated that the basic research methods would be determined and pad testing initiated during the 2007 fiscal year. Full field testing and demonstration will take place in succeeding years. PROGRAMMED COST FY 2007: TOTAL ESTIMATED COST: $50,000 $50,000 Note: The required full field testing/demonstration would be funded ITom other sources.
Effective start/end date7/1/066/30/07


Explore the research topics touched on by this project. These labels are generated based on the underlying awards/grants. Together they form a unique fingerprint.