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M arineGeoresources Geotechnology Tocitethisarticle: Ji-ChengW ang,JianlinYu,ShiguoM a XiaonanGong(2015):HammersImpactForceonPileand Piles Penetration,M arineGeoresources Geotechnology,DOI:10.1080/1064119X.2015.1016637 Tolinktothisarticle:/10.1080/1064119X.2015.1016637 Acceptedauthorversionpostedonline:28M ay2015. Hammer’s Impact Force on Pile and Pile’s Penetration Ji-Cheng Wang Institute of Architectural Engineering, Ningbo University of Technology, Ningbo, Zhejiang, China Jianlin Yu College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China Ma Shiguo Ningbo Urban Construction Investment Holding Company Limited, Ningbo, Zhejiang, China Xiaonan Gong College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China Address correspondence to Ji-Cheng Wang, No. 201, Fenghua Road, Jiangbei District, Ningbo, Zhejiang 315211, China. E-mail: wjc1818@ Color versions of one or more of the figures in the article can be found online at /wifa. Abstract Methods of energy and momentum conservation, vibration theories, and model tests are employed to research into impact force of hammer on pile and pile’s penetration Analytical formula of impact force of hammer on pile is obtained. Comparison of results from the three methods finds that the analytical formula proposed by this paper conforms well to practical situations. Research results 1 show that, If hammer’s impact energy remains unchanged, Penetration increases with the increase of hammer weight and cushion stiffness; Impact force the pile head receives degrades with the increase of hammer weight but increases with the increase of cushion stiffness; Impact time decreases with the increase of cushion stiffness but increases with the increase of hammer weight. Model test shows that, compared with cotton cloth cushion, elastic cushion’s advantages lie in that relatively small pile head impact force can achieve big pile penetration, and cotton cloth is gradually compacted with the in