McCook Reservoir Instrumentation and Monitoring

The McCook Reservoir project is a below-grade reservoir to temporarily store combined sanitary overflow (CSO) water from the city of Chicago and surrounding communities. CSO is stored until it can be treated and then discharged into the Chicago sanitary and ship canal (CSSC). The reservoir is being excavated through approximately 15.2 m (50 ft) of soil and 76.2 m (250 ft) of rock, requiring the installation of earthen retaining walls and rock support measures for the near vertical rock wall to achieve the design depths and geometries. In addition, in order to minimize groundwater infiltration and CSO exfiltration, a perimeter cutoff wall and grout curtain have been installed. Due to the project proximity to adjacent roadways, railways, and waterways as well as for onsite project safety, a potential failure modes analysis was performed on the various project features and a surveillance and monitoring plan was developed to monitor for those failure modes that were deemed credible. This monitoring program consists of a series of piezometers, inclinometers, time domain reflectometry, extensometers, crack meters, survey methods, and visual monitoring. An automated data acquisition system (ADAS) is also installed that permits near-real time access to automated instrumentation data. The purpose of this paper is to discuss the lessons learned regarding design and installation considerations for the design, installation, data management, interpretation, and evaluation of the instrumentation.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 551-562
  • Monograph Title: Geo-Chicago 2016: Sustainability and Resiliency in Geotechnical Engineering

Subject/Index Terms

Filing Info

  • Accession Number: 01609419
  • Record Type: Publication
  • ISBN: 9780784480120
  • Files: TRIS, ASCE
  • Created Date: Aug 11 2016 3:03PM