The capacity of the Wuku-Yangmei section of Freeway No.1 is not sufficient to cater for developing the Taoyuan Aerotropolis. To provide more traffic lanes to the existing freeway, a series of pier foundations at its embankment are constructed for the Wuku-Yangmei Overpass which is to ease peak-hour congestion between Taipei and Taoyuan. Soil nail shoring system and an alternative shoring method with ring beam at slope portion and composite shoring system at foundation portion are applied to Piers B7 and C15, respectively, to compare their surface tension crack, lateral slope displacement, and lateral displacement-time curve. Field measurements indicate that the soil nail shoring system fails to limit slope lateral displacement leading to the extensive slope sliding incident. 3D finite element (FE) analyses using the parameters that are back-calculated by comparing the lateral displacement-depth curves to the inclinometer data have been conducted. The same parameters have been brought forward to the case of the alternative shoring. The modeling results are found to be in agreement with the field measurements and the shear strain profile may give a better understanding of the sliding surface position.
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