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Abstract A new walking type static cone penetration which has strong penetration ability was invented. It can penetrate into the hard rock and soil layers such as strong weathered rock and reach the required exploration depth of end bearing pile and was called triple-bridge cone penetration which the total penetration force test was added on the basis of the double- bridge cone penetration test. A new accurate estimation method of piling pressure at the specified pile diameter and depth or embedded depth of pile at the specified piling pressure and pile diameter has been proposed after the comparative study between triple-bridge cone penetration test and pressure test of model pile，and The whole rock and soil are considered as a system. A new estimation method of ultimate bearing capacity of the end bearing pile in the pearl river delta region was summarized after the comparative study between triple-bridge cone penetration test and static loading test，and these methods fill the gaps in current code. The findings show that the triple-bridge cone penetration test which has strong penetration ability will provide very useful guidance to the design，construction and inspection of pile foundation.
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2015, Vol. 34 
