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Factors Affecting Lubrication of Pipejacking in Soft Alluvial Deposits

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Innovative Solutions for Soil Structure Interaction (GeoMEast 2019)

Part of the book series: Sustainable Civil Infrastructures ((SUCI))

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Abstract

Inadequate lubrication during pipe ramming can result in exaggerated jacking force leading to damages to the jacked pipe string and adjoining properties. However, a consensus due to limited studies has not yet reached. This study describes a method that can be used to evaluate the lubrication performance by the reduction in the frictional coefficient μ as a function of injection mode, soil and lubrication natures, and pipe deviation. The results of an application of the method to a pipe ramming project in soft alluvial deposits are presented. Compared to 0.4 kPa of the 2–8 m section of the gravel, the excessive pipe deviation, while spanning through the 8-21 m section of the same gravel at Drive C, increases the frictional stress τld to 12.5 kPa, thereby reducing the reduction in the frictional coefficient μ to 71%. At Drive D, the combined effects, resulting from the excessive pipe deviation and the varying face resistance induced by driving into the 11–24 m section of clayey gravel, contribute to the growing frictional stress τld of 4.0 kPa and are deemed as being the major cause leading to the low reduction of 84%. While pipejacking through the 24–31 m section of clayey gravel, the occasional gravel leads to the inability of developing lower face resistance causing the misleading reduction of 60%. To summarise, the excessive pipe deviation and/or the varying face resistance largely affects the percentage reduction in the μ value despite the excessive volumes of injected lubricant. The occasional gravel leads to the misleading reduction.

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Correspondence to Wen-Chieh Cheng .

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Cheng, WC., Li, G. (2020). Factors Affecting Lubrication of Pipejacking in Soft Alluvial Deposits. In: El-Naggar, H., El-Zahaby, K., Shehata, H. (eds) Innovative Solutions for Soil Structure Interaction. GeoMEast 2019. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-34252-4_10

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