红杏视频

Title of talk:
Getting Wet! Exploring impacts of Groundwater on intact, corroded and relined pipes

Talk abstract:
Culvert and sewer systems are generally designed without any consideration of groundwater, and yet the sustainability of such assets needs to be examined in the context of flooding and groundwater loads due to climate change. This presentation describes three recent experiments that explore the potentially dramatic impacts of groundwater on culverts and storm sewers. Firstly, an experiment on a corrugated steel pipe was conducted using a test facility that permits saturated ground testing, and investigation of culvert performance during flood events. The pipe was buried in dry sand, and its response observed under simulated wheel loading for three different groundwater conditions: when dry, after the groundwater level was raised close to the surface (simulating a flood event), and when the groundwater was lowed back down to the haunches (leaving much of the sand unsaturated). The changes in soil modulus for the three different levels of effective stress produced substantial changes in the bending moments that develop, with substantially higher vehicle load moments for the high groundwater (flood) condition. Next, perforations were opened along the haunches of the pipe, representing the impacts of severe corrosion. After raising the water level back to the crown, erosion of the backfill soil commenced, which also produced significant changes to the bending moments distributions induced by wheel loads. Finally, an experiment was undertaken to examine culvert response following repair using a cured in place polymer pipe liner. This involved applying external groundwater on the liner to explore the impact of buoyancy which is normally ignored in liner design. External pressures were then raised to the point where the liner experienced buckling failure. Each of these experiments provides unique data, reveals the profound impacts of groundwater, and better equips designers to make rehabilitation decisions in the context of climate change.

Bio:
Trained in Australia, Dr Moore has held the position of Professor and Canada Research Chair in Infrastructure Engineering within the Department of Civil Engineering at Queen’s University since 2001. His more than 300 publications examine conventional and trenchless construction of new and deteriorated water, sewer, and energy pipelines, and have underpinned dozens of contributions to North American and other international codes of buried pipe design practice. Research includes work clarifying the strength of new and deteriorated pipes, contributions to behaviour of pipe liners, pipes pulled into place using slip lining, pipe bursting and horizontal directional drilling, and studies of onshore and offshore oil and gas pipelines. Ian’s studies combine analysis of soil-pipe interaction, and use of the world’s most capable and active buried pipe testing facility that he has developed with his colleagues at Queen’s. Recognition for Dr Moore's work includes best paper awards from the ASCE, CGS, CSCE, ICE and NASTT, and Fellowships in the Royal Society of Canada (Academy of Sciences), the Canadian Academy of Engineering and other learned societies.