 Graduate Geotechnical Research Laboratory
The graduate research laboratory currently provides research space for students performing a variety of research topics ranging from bridge pier scour to reuse of recycled materials for use in transportation projects. The laboratory is currently being fitted with a data acquisition system that will be fully automated and properly interfaced to allow microcomputer controlled testing.
The laboratory is capable of performing all standard geotechnical tests associated with civil engineering research.
Current Research
- Evaluation of the SRICOS Method for Predicting Bridge Pier Scour in Cohesive Soils
The SRICOS method uses site specific measurements and a step by step procedure to predict the scour depth versus time curve at a bridge site (Briaud, et al., 1999). The method can lead to substantial savings in bridge pier construction at cohesive soil sites and sites with infrequent floods. This research uses field case study sites in South Dakota to verify the method so that it can be used confidently in bridge foundation designs. A sensitivity analysis will be conducted to determine the critical input parameters in the method and to prioritize which input parameters are the most important in estimating the scour depth. Guidelines will also be developed on use of the method in small watersheds and ungaged streams where detailed flow records are not available.
- Evaluation of Using Recycled Materials for Use in Transportation Projects
Regions of the United States are experiencing a lack in quantity of conventional aggregates such as sand, gravel, and crushed rock. . It is proposed that mine refuse could provide a practical use as a nontraditional construction material. This investigation consisted of performing laboratory tests to determine the index and engineering properties of the coal mine refuse at a readily available coal mine site. A series of laboratory experiments were performed based on the engineering requirements of embankment and roadway design from local and national specifications. Specifically, index testing consisted of specific gravity, grain size distribution, and soil classification; engineering property tests consisted of freeze/thaw susceptibility, compaction, bearing ratio, direct shear, and triaxial compression testing (with consolidation and permeability measurements). Conclusions were formulated and recommendations were provided based on the results of the laboratory tests.
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