条形基础宽度为3.6m,合力偏心距为0.8m,基础自重和基础上的土重为100kN/m,相应于荷载效应标准组合时上部结构传至基础顶面的竖向力值为260kN/m,修正后的地基承载力特征值至少要达到多少才能满足承载力要求。
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某条形基础,宽度b=2.0m,埋深1.5m,基础顶作用竖向荷载Fk=350kN/m,土层分布:0~3.0m,黏土γ=19.8kN/m3,Es=12MPa;3.0~5.0m淤泥质黏土,γ=18kN/m3,Es=4MPa。试计算软弱下卧层地基压力扩散角和软弱下卧层顶面附加压力值。
某山区地基,地面下2m深度内为岩性相同,风化程度一致的基岩,现场实测该岩体纵波速度为2700m/s,室内测试岩块纵波波速为4300m/s,从现场取6个试样进行饱和单轴抗压强度试验,得到饱和单轴抗压强度平均值为13.6MPa,标准差5.59MPa,试计算2m深度基岩地基承载力特征值。
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A. The Juice-Juju uses only the inside of the orange.
B. A, Right B. Wrong C. Doesn’t say
某高层建筑,地上25层,地下2层,采用筏板基础,底面尺寸30m×25m,板厚2.45m,竖向荷载Fk=3×105kN,基础埋深6.0m,地下水位-5.0m,土层分布:0~2m填土,γ=15kN/m3;2~10m粉土,γ=17kN/m3;10~18m黏质粉土,γ=19kN/m3;18~26m粉土,γ=18kN/m3;26~35m为卵石,γ=21kN/m3。混凝土γ=24.5kN/m3。试求:(1)基底平均压力;(2)基底附加压力;(3)在22m取土进行压缩试验,试验最大压力;(4)φ=20°,ck=15kPa,计算地基承载力特征值。