This paper presents a case report of water seepage through deep bored piles during construction of deep basement of thehigh-rise hotel project in Bangkok. Bottom-up method of construction was used with diaphragm wall as a temporary wallduring excavation and as a permanent wall after completion. There were three steel bracing layers. The maximum depthof excavation of -14.80 m. from ground surface. After excavating to the final depth, there was water seepage observed atpile head during pile head trimming at cut-off level of more than 85%. This phenomenon is rarely seen as for as the authorsconcern. There are several possible causes; for example, percentage of fly ash mixture together with high water head. Tominimize the possible long-term durability, PU form grouting shall be conducted to stop the water seepage before castingmat foundation.
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