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Transportation

Baltimore Washington Parkway Slope Repair at Route 197 Exit

Laurel, MD

Description

After a series of rainstorms, the fill embankment at the reconstructed Route 197 interchange failed, with resulting settlement and lateral movement of a retaining wall that supported the southbound lanes of the parkway.

Challenge

A slope failure beneath a precast retaining wall system created several challenges to the Federal Highway Administration and the National Park Service including minimize the cost for slope stabilization as well as minimize the impact on trees and parkland.

Solution

A Tensar Ares temporary wall system was utilized to minimize impact on the trees and parkland.  Geopier vertical soil reinforcements were used to stabilize both the wall and the slope.  The Tensar wall provided a work platform for Geopier installation and use of a crane to remove and replace the precast wall with minimal disturbance to the existing tree line.  The Geopier elements provided a cost effective means of controlling settlement of the precast wall and reinforcing the high plastic clay slope so that ultimately a rockfill berm counterbalance could be installed to stabilize the slope.

 

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