America Rebuilds: A Year at Ground Zero
Ground Zero Profiles
Engineering the Clean-Up
Artifacts
Video Stories
Imagining the Future
Dialogue
About the Program

Assisting the Rescue
Surveying the Damage
Assessing Buildings
Navigating the PATH
Understanding the Site
Stabilizing the Wall
Removing Debris
Supporting Structures
Extracting Hazards
Uncovering Property



Quick Facts

Sources

Stabilizing the Wall

Crack in the ground widens

To Backfill or Not to Backfill

GEORGE TAMARO: We immediately removed all the equipment working on Liberty Street and began installing wells on the outside of the bathtub to remove as much pressure from the wall as possible. We were undecided on our next step: We needed some lateral support; however, if we put in backfill, the wall might collapse. As we were installing the wells on October 7th and 8th, the decision was thrust upon us: we discovered a five to six inch crack in the street — the wall was moving and we had to take immediate action.

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Image credits: Mueser Rutledge Consulting Engineers