Abstract
A warehouse that had been built in thick sot soil ground with long PC piles of point supported and used as steel products center was divided into two parts. The western half was retained as it was with piled foundation and reused as automobile disassembly yard. The eastern half was used as macadam stock yard after dismantling ware structure as well as foundation piles. Within a few months after the operation of stockyard, the columns of the adjacent disassembly yard were found being settled. Overhead travelling cranes in the disassembly yard was also found being deformed. A question why the structure that is supported by point bearing piles should have settled was sent to the first author. This paper describes the process of geotechnical study and field monitoring including GPS to disclose the mechanism.
