Performance of cantilever sheet pile walls in sensitive clays: Case study Campus Ullevål
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The continuous development of urban areas often requires underground constructions close to existing structures and in challenging ground conditions. In Norway, deep excavations in soft marine clays are usually supported by sheet pile walls (SPW) and tieback anchors or internal struts to safeguard the excavation pit and its surroundings until sufficient support is provided by the permanent structure. Cantilever SPWs are rarely used, as deflections are often quite significant. Furthermore, the acting earth pressure distribution, and consequently also the deflection profile, is often difficult to predict. Particularly, the earth pressure distribution and its development over time warrants further investigation. The research project CURIOUS (Campus Ullevål: Research and Instrumentation Of Underground Structures) was initiated at NGI to study and improve the design of cantilever SPW in sensitive clays. A six-meter-deep excavation pit in Oslo was equipped with an elaborate monitoring system, including strain sensors on the SPW, inclinometers, load cells on temporary struts and geodetic points, to gain a better understanding of the earth pressure development along the retaining structure during the different construction stages. In this paper, results of the instrumentation are presented for different construction phases. The earth pressure distribution acting along the SPW was back calculated based on monitoring data and further compared with predicted distributions. Performance of cantilever sheet pile walls in sensitive clays: Case study Campus Ullevål