'Challenges from Pipe Installation to Rehabilitation' - Dr Haitao Lan
Abstract:
Pipelines help transport water, wastewater, gas and oil to different locations and are commonly buried underground. However, when buried, they are easily forgotten. In this presentation, three challenges will be briefly discussed from pipe installation, performance and rehabilitation. For pipe installation, Horizontal Directional Drilling (HDD) is one of the most popular Trenchless Technologies to install pipelines crossing rivers, lakes and other obstacles. Borehole stability is one of the most concerns during construction. Experimental and numerical investigation are applied for examining stability of horizontal boreholes with different buried depths. For pipe performance, an example is given here about a corrugated High Density Polyethylene (HDPE) pipe buried in a full-scale facility simulating differential ground movement (or 90 degree dip fault). Its structural response is shown with increase of soil movement. For pipe rehabilitation, a challenge related to sliplining, a preferred rehabilitation method for deteriorated culverts and drainage structures is discussed. When a liner pipe is placed within the deteriorated host pipe, the gap between the two is filled with grout. Two experimental tests have been undertaken to simulate external grouting pressure around the liner and investigate what is the critical pressure triggering pipe failure.
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