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Waterborne Geophysical Investigation to Assess Condition of Grouted Foundation: Old River Control Complex-Low Sill Structure, Concordia Parish, Louisiana
[Technical Report, Final Report]
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MSOAK RIDGE INST FOR SCIENCE AND EDUCATION TNADVANCED GEOSCIENCES INC.SPOTLIGHT GEOPHYSICAL SERVICES, LLC
Pagination or Media Count:
The Old River Low Sill Structure ORLSS at the Old River Control Complex ORCC in Concordia Parish, LA, is a steel pile-founded, gated reinforced-concrete structure that regulates the flow of water into the Atchafalaya River to prevent an avulsion between the Mississippi River and the Atchafalaya River. A scour hole that formed on the southeast wall of ORLSS during the Mississippi River flood of 1973 was remediated with riprap placement and varied mixtures of self-leveling, highly pumpable grout. Non-invasive waterborne geophysical surveys were used to evaluate the distribution and condition of the grout within the remediated scour area. Highly conductive areas were identified from the surveys that were interpreted to consist mostly of grout. Resistive responses, likely representing mostly riprap andor sediment, were encountered near the remediated scour area periphery. A complex mixture of materials in the remediated scour area is interpreted by the more gradual transitions in the geophysical response. Survey measurements immediately beneath ORLSS were impeded by the abundance of steel along with the structure itself. The survey results and interpretation provide a better understanding of the subsurface properties of ORLSS.
[A, Approved For Public Release]