Combined Ground Improvement Method for Cultural Heritage Preservation—A Case Study in Angkor Ruins, Cambodia

The historical ruins, which consisted of rocks or soils, are treated for their preservation. In many cases, the ground improvement techniques are being used for the preservation of them. One tower of Angkor ruins was deemed as the most dangerous tower among them for restoration work. The compacted sandy formation was found from −1.5 m from the original ground surface and to +3.5 m above the ground. The safety factor for the ground bearing capacity in rainy season was calculated with S.F = 1.1. When its bearing strata were reconstituted, it was designed to have a sufficient safety factor value of S.F > 1.5. To achieve this purpose, the original sandy soils were mixed with slaked lime and compacted by tamping with geotextile. The material soil used for the platform was a mixture of different soils of original sandy soil, clayey soil, and lateritic soil at weight ratios of 70, 15, and 15%. Slaked lime was added to the mixed soil 1 at a rate of 0.1.