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Rappahannock Regional Jail Expansion Retaining Wall

Stafford, VA

DESCRIPTION

A 23 ft high retaining wall was required to create space for the expansion of the existing detention facility. The 378,000 sf expansion increased the inmate capacity to 2000.

CHALLENGE

The site investigation suggested that the existing hillside was composed predominately of stiff marine clays overlaying sedimentary rock formations exhibiting varying degrees of weathering. High groundwater was reported in some of the boring logs and shallow slope failures and perched water in the existing hillside were evident.

SOLUTION

GeoStructures investigated a number of alternative solutions. In the preliminary design, it became apparent that the low long-term strength of the marine clay would drive economic viability. GeoStructures developed two options and ultimately determined the MSE Wall solution comprising precast panels and ribbed steel strips to be the most beneficial. To enhance stability while maintaining economy, GeoStructures proposed an innovative L shaped cross section, with longer steel strips near the bottom of the structure. This design detail enhanced sliding stability over the weak marine clay soils.

Owner

Rappahannock Regional Jail Authority - Stafford, VA

General Contractor

Balfour Beatty Construction - Fairfax, VA

Architect

PSA-Dewberry - Fairfax, VA

Structural Engineer

Hankins & Anderson Consulting Engineers - Richmond, VA

Civil Engineer

Dewberry - Fairfax, VA

Product

Retaining Walls

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