The paper describes the ground investigations carried out during the design period to supplement the tender information provided by the employer, the Taiwan Highspeed Railway Corporation (THSRC). The Grund Investigation was carried out in 2 or 3 stages consisting of boreholes with SPT's and disturbed samples. At some locations in Contract 270 CPT tests were also undertaken, where soil conditions allowed the probe to penetrate the strata. The majority of the foundations to the viaducts are piled. The design of the 2.0m diameter piles was based on local practice verified by 16 No full size pile tests. The test piles varied in length being 30m to 44m in Contract 260 and 55m to 72.5m in Contract 270, to replicate the pile lengths required to support the viaduct structure. The paper presents the results of the load tests, the verification & development of the design equations
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