This paper presents a field study on the compressive bearing capacity of pre-bored grouted planted (PGP) pile and bored pile embedded in deep soft clay. The test site consisted of many concrete square piles which were used for the foundation of the old structures. The PGP pile and bored pile were considered as the two suitable pile types in this test site. The test results show that: the compressive bearing capacity of 900 mm PGP pile with 1200 mm enlarged base is identical to the compressive

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... aring capacity of 1000 mm bored pile, and the ultimate unit skin friction of PGP pile is about 1.28 times the ultimate unit skin friction of bored pile. Based on the comparison between the PGP pile and bored pile, the PGP pile can be considered as a type of resource conservation and eco-friendly pile foundation. Ó 2020 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).