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某灌注桩桩径0.9m,桩长15m,扩底直径D=1.2m,扩底高度2.0m,承台埋深2.0m,土层分布:0~2.0m填土;2~5.0m黏土,qsik=30kPa,5~14m粉砂,qsik=40kPa;14~17m砾砂,qsik=95kPa,qpk=2500kPa,计算单桩极限承载力接近()。