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Abstract: The South Hartford Conveyance and Storage Tunnel (SHCST) is a major component of the Hartford Metropolitan District’s Clean Water Project (CWP). This tunnel is intended to capture and store Combined Sewer Overflows (CSO) from the southern portion of Hartford, CT and Sanitary Sewer Overflows (SSO) from West Hartford and Newington, CT. The project is estimated to cost approximately $500 MM and...
Abstract: This paper presents the design and construction of a deep rock conveyance and storage tunnel and pump station cavern that was built about 70 m below ground surface for the City of Indianapolis. The TBM tunnel ran nearly 16 km in limestone with a finished inside diameter of 5.5 m. It provided a minimum storage volume of 205 million liters of untreated excess wet weather overflow. A pump station...
Abstract: Many major cities in the United States have a combined storm water and sanitary sewer network. Regular rainfall overwhelms the system capacity and results in millions of cubic meters of untreated sewage being dumped into local waterways. One legally mandated solution includes several kilometers of large diameter shallow or deep rock or soil tunnels, a pump station as well as associated...
Abstract: Precast segmental linings are increasingly used in the mechanized tunneling methods using TBM- bored shield tunnels. Tunnel segments are designed following the approach of limit state design recommended by national and international codes and guidelines. Ultimate limit state (ULS) and serviceability limit state (SLS) are specified in these design codes. The former focuses mostly on the ultimate...
Abstract: One of the major environmental impacts related to blasting operation in tunnelconstruction is ground vibration. The elastic energy which is at a level less than the energy requiredto break the rock, increases the ground vibration. Ground vibration is a matter of great concern as itmay cause damage to the existing adjacent structures depending upon the intensity and duration ofvibration. The...
Abstract: Methods for analysis and design of segmental tunnel linings are presented inconformance with standards and guidelines from Austria (ÖVBB), France (AFTES), Germany(DAUB), Japan (JSCE), Netherland, United States (FHWA) and International Tunneling Association(ITA). Effect of embedment loads on segments is analyzed using elastic equations, a beam-springmodel, and Finite Element or Finite Difference...
Abstract: Major rapid transit projects are planned to be built across the Greater Toronto and Hamilton Region in Canada. The plan is part of The Big Move (Metrolinx 2008) a 25-year, $50 billion plan that will improve regional transportation. Metrolinx, an agency of the Government of Ontario, is now working collaboratively across the region to deliver major Toronto rapid transit projects.
Abstract: Tunneling operation in congested urban areas becomes more frequent as demand for further utiliz-ing underground spaces grows. In urban settings, it is not uncommon for tunnel designers to plan a tunnel route in close proximity to other structures to satisfy other competing objectives like rais-ing the alignment to reduce excavation volume. Setting the alignment close to existing structures...
Abstract: The South Hartford Conveyance and Storage Tunnel (SHCST) is a major component of the Hartford Metropolitan District’s Clean Water Project (CWP). This tunnel is intended to capture and store Combined Sewer Overflows (CSO) from the southern portion of Hartford, CT and Sanitary Sewer Overflows (SSO) from West Hartford and Newington, CT. The project is estimated to cost approximately $500 MM and...
Abstract: Cracking in tunnel linings is a major cause for reduction in serviceability due to water infiltration and exfiltration, and reinforcement corrosion. In current industry practice, in order to control ground water inflow in lined tunnels, maximum crack width is limited to allowable values in a range of 0.15-0.3 mm specified by the codes, guidelines and recommendations. However, a correlation...
