关键词: 复合地基, 既有建筑物, 纠偏加固, 截桩法, 迫降

Abstract: In the coastal areas of the Yangtze River Delta area, the soil improved composite ground is the most widely used foundation type for the multi-story residential buildings with a total height below 24 meters. Due to its special geological and geotechnical environment, there are occasional differential settlements occurred after the completion of these residential buildings.  To mitigate the differential settlements in these buildings, the conventional improvement methods usually have a long construction duration and are often costly. This paper presents a case history of a tilted existing residential building restoration in Qidong City, Jiangsu Province by using the anchored static pressuring pile combined with interception pile method. The existing building was improved by soil-cement mixing columns. Throughout the planned interception of the existing soil-cement columns, this method can restore the tilting and at the same time, significantly reduce the construction duration and the cost. From the construction monitoring data, this combined method can be applied in the buildings on the composite ground with a total height less than 24 meters.

Key words: Composite Ground, Existing Buildings, Tilting Mitigation, Interception Column Method, Forced Settlement