试题详情

某工程场地为软土地基,采用CFG桩复合地基处理,桩径d=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,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应为( )。(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)

ARa = 151kPa; fcu =3210kPa

BRa = 15kPa; fcu =2370kPa

CRa= 159kPa; fcu=2430kPa

DRa = 163kPa; fcu =2490kPa