Due to the high population density in metropolitan area in Taipei, deep excavations are frequently used for both public infrastructure and private sector construction. Such excavations often result in large settlement of nearby buildings which naturally concerns their residents. The ground conditions in Taipei are generally lightly over consolidated clays and silts with a high water table and several measures are commonly adopted to reduce the settlement of adjacent buildings beside excavations. Amongst these, the installation of temporary props to the facades of buildings beside excavations is not an unusual sight. Sometimes an additional row of piles is installed between the perimeter wall and the adjacent building. In this paper, the records of settlement for several buildings beside excavations in Taipei is presented, and the effectiveness of protective propping and piling is assessed.
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