KARST GEOLOGY SERVEY OF BRIDGE FOUNDATION PILES' BOTTOM

According to demand of karst geology survey of foundation piles' bottom at a bridge's east suspension tower, the synthesis survey technology was adopted to karst geology survey of each foundation piles' bottom for the engineering, in which electromagnetic wave reflection method was the main method, fitted with high density electrical method and acoustic wave reflection method. It was introduced in detail with survey principle and process and effects of synthesis analysis of the three methods. According to the analysis of survey, rock was relatively more complete in 30 meters depth in total, only partial area was relatively fractured, some clay blanket and soft mud interlayer were filled between joint planes, no large-scale or greatly large-scale karst cavities existed. Proved by drilling and brazing, survey effect was agreement with real geology condition. It was indicated that the synthesis survey technology could be extended to karst geology survey for other same engineering.