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Abstract Concerning foundation design of power equipment on thick soft soil layer in coastal region，the overwhelming question is settlement control. The ground settlement can be manipulated by changing the pile slenderness ratio of blocked foundation with the pile below. Comparing two schemes in several aspects，the case study shows that just altering pile length makes inconspicuous efforts to the vibration displacement of foundation in coastal areas. According to the analysis，it is appropriate to use the more reliability foundation style called rigid-flexible and long-short pile composite foundation，which is argued more available in differential settlement control，to design and calculate.
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Received: 15 April 2006
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