ABSTRACT
Soils and foundation of Bayon temple of Angkor Thom has been studied since 1994 by Japanese Government Team for Safeguarding Angk Japanor (JSA). The character defining elements of the authenticity are identified as 1. trenched foundation system for the temple zone, 2. uniform grain size distribution of silty sand of the manmade fill, 3. simple shallow direct foundation of the main tower of 32 m in height standing upon thick silty sand compacted fill. The compacted filled platform is very hard with SPT N-value of 100-200 in dry condition but collapses in water. Amazing fact is the central tower has been standing without failure for more than 800 years since it had been constructed in late 12th century or early 13th century,
