Some descriptions of D'Appolonia projects involving tunnels and underground construction are provided in the following:
Geotechnical Engineering for Light Rail Transit System
D’Appolonia provided geotechnical engineering consulting services, prepared designs and provided construction management services over a ten-year period for the construction of a light rail transit (LRT) system connecting metropolitan and south suburban Pittsburgh, Pennsylvania. The work included both above- and below-ground components of the system.
Redesign of Fossil-Fuel Power Plant Cooling Water Intake Canal
D’Appolonia developed designs to rehabilitate a cooling water intake canal at a 700-MW power plant. The selected remedial concept involved the construction of two buried 11-foot-diameter concrete pipes connecting new inlet and outlet transition structures. The work was completed on an expedited schedule to minimize outage at the power plant.
Ground Improvement for Coal Refuse Conveyor Tunnel Construction
D’Appolonia was retained to investigate an abandoned coal mine and to determine its possible effect on a tunnel to be constructed through the area. We developed a program of grout injection through 100-foot-deep boreholes to stabilize loose and/or unstable rock conditions. The grouting program successfully mitigated the poor tunnelling conditions and allowed the tunnel to be completed on schedule.
Evaluation of Spillway Tunnel for Hydropower Generation Usage
As part of a study to determine the feasibility of pressurizing a spillway outlet tunnel for hydropower generation, D’Appolonia planned and conducted an extensive in-situ testing program that included drilling and sampling of the tunnel liner and surrounding rock, hydraulic pressure testing, crack survey and evaluation of laboratory testing results.
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