Repair of Earthquake Damaged Underground Reservoir

A concrete underground water storage reservoir, damaged by earthquake, was repaired with epoxy compounds and by employing some unusual construction methods. Structural redesign and permanent removal of earth fill from the roof slab made it feasible to rehabilitate and strengthen the structure sufficient to meet seismic criteria that were judged to be compatible with the site conditions. The extensive use of epoxy repair techniques was instrumental in making it possible to salvage large portions of the walls and slabs without complete demolition and replacement, which was required for the most severely damaged areas. A substantial part of one exterior wall and adjacent displaced roof slab were successfully jacked back into original positions by a construction procedure that employed the use of heavy bridge shoring together with an array of hydraulic jacks.