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问题 单项选择题

某基础b=3.0m，埋深1.5m，持力层为软黏土，ψ=0，无侧限抗压强度qu=6.6kPa、γ=18kN/m3，计算地基承载力特征值接近（）。

A、40kPa

B、36kPa

C、39kPa

D、37kPa

答案

参考答案：D

解析：

ψ=0°，Mb=0，Md=1.0，Mc=3.14

软黏土cu(不排水抗剪强度)=qu/2=6.6/2=3.3kPa

fa=0+1.0×18×1.5+3.14×3.3=37.4kPa

[点评] (1)根据GB 50007—2002第5.2.5条，由土的抗剪强度指标确定地基承载力特征值可用以上公式，其第一项为土重度对承载力影响；第二项为基础埋深的影响；第三项为土的c、ψ值对fa的影响；

(2)ck为三轴不固结不排水压缩试验的黏聚力标准值；

(3)承载力系数Mb、Md和Mc，根据土的ψ角查GB 50007—2002表5.2.5；

(4)由该公式计算地基承载力特征值为fa，不能进行深、宽修正。

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