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Underground Lunch and Learn: Overview of Trenchless Techniques and the Engineering Judgement Required to use Empirical Estimating Methods for Pipe Jacking Forces
February 13 @ 12:00 pm - 1:00 pmFree, Lunch Provided
Overview of Trenchless Techniques and the Engineering Judgement Required to use Empirical Estimating Methods for Pipe Jacking Forces
An overview of trenchless techniques including pipe ramming, auger boring, pilot tube guidance, pipe jacking, hand mining, mechanical excavation, TBMs, MTBMs, and HDD.
Estimating jacking force parameters often involves empirical methods that are correlated to ground conditions by coefficients derived from case histories. A recent MTBM project in Denver, Colorado with twin 96-in. MTBM storm drains under a rail yard illustrates this point. There are a wide variety of methods for predicting jacking forces, and wide variation of geologic-related coefficients included in those methods. There does not seem to be good agreement between the resulting models. The authors have compared multiple estimating models to the actual measured results and found widely varying deviations.