某7层框架结构，上部荷载Fk＝80000kN，筏板基础14m×32m，板厚0.46m，基础埋深2m，采用粉喷桩复合地基，m＝26%，单桩承载力特征值为237kN，桩体试块fcu＝1800kPa，桩径0.55m，桩长12m，桩间土fsk＝100kPa，γ＝18kN/m3，试验算复合地基承载力是否满足求（β＝0.8，η＝0.33）。
参考答案：
桩体承载力特征值
Ra＝ηfcuAp＝0.33×1800×0.237＝141kN＜fpk＝237kN
取Ra＝144kN
复合地基承载力特征值
深度修正后fa
fa＝fspk+ηdγm(d-0.5)，设ηd＝1
fa＝214+1.0×18×(2-0.5)＝214+27＝241kPa
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