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| | Abstract | | An electrical resistivity survey has been conducted to evaluate the damage of the stone structure at the Bayon temple of Ankor Thom. It was impossible to stick regular metal electrode on the surface, because the objects are composed of sand-stone and/or laterite blocks. As the countermeasure, moist cakes of bentonite covered by aluminum foil were used as electrodes and mounted on the sand-stone and laterite blocks. From the result of the survey, the foundation structure below the northern part of the temple was classified into three different resistivity zones. The low, high and very high resistivity zones are correspondent to the natural soil, the artificially compacted soil and the zone of sand-stone and laterite blocks respectively. An resistivity tomography was also carried out at the damaged terrace located at northern part of the temple tower. From the result of tomography, quite high resistivity anomalies are detected, which suggests that there are highly loosened and dry zones below the terrace and/or pore spaces are formed between the sand-stone and laterite blocks. |
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