某工程场地为软土地基，采用CFG桩复合地基处理，桩径d=0.5m，按正三角形布桩，桩距s=1.1m，桩长l=15m，要求复合地基承载力特征值fspk=180kPa，则单桩承载力特征值Ra及加固土试块立方体抗压强度平均值fcu分别为（）。（取置换率m=0.2，桩间土承载力特征值fsk=80kPa，折减系数β=0.4）。
A．Ra=151.5kPa，fcu=2316kPa
B．Ra=155.5kPa，fcu=2270kPa
C．Ra=159.5kPa，fcu=2430kPa
D．Ra=163.5kPa，fcu=2495kPa
参考答案：A
解析：
根据《建筑地基处理技术规范》(JGJ 79-2002)第9．2．5条及第9．2．7条计算
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