CHALLENGES IN TUNNELING WITH A HARD ROCK SLURRY TBM IN COLUMBUS, OHIO

摘要

The City of Columbus OSIS Augmentation Relief Sewer (OARS) is a major componentrnin the City’s Long Term Control Plan (LTCP) for CSOs. The alignment passes throughrnkarstic-solution featured limestone that called for a hard rock slurry pressure balancernTBM to control the large water volumes anticipated. The project is unique as it requiredrnthe utilization of several innovative ideas to drive one of the longest hard rock tunnelsrnusing a slurry TBM. The paper will explore several of these ideas such as; muck andrnslurry removal, installation of an upgraded slurry system during production mining, andrnseveral unique methods of cutterhead access.