CONTROLLING HIGH HYDROSTATIC WATER INFLOWS AT LAKE MEAD CONNECTOR TUNNEL-DEVELOPMENT, OUTCOMES, AND LESSONS LEARNED

摘要

Significant water control challenges have been experienced and overcome at thernSouthern Nevada Water Authority’s Lake Mead Intake No. 3 Connector Tunnel Project.rnThese challenges are attributed to the tunnel depth, jointed ground conditions andrnclose proximity to a relatively infinite water source, Lake Mead, resulting in high hydrostaticrngroundwater pressure. A well thought-out grouting program using cementitiousrnand chemical grout mixtures has been developed jointly by the Owner and Contractorrnfor water control during the drill-and-blast subsurface excavation. This paper sharesrnthe guidelines developed, the adjustments employed, and the lessons learned of thernimplemented water control program.