一条形基础,宽为b=2m,埋深d=1.5m,由上部承重墙传下的竖向力为F=500kN,则该条形基础的基底压力p为
A.280kPa
B.260kPa
C.310kPa
D.276kPa
A.280kPa
B.260kPa
C.310kPa
D.276kPa
条形基础宽2m,基底埋深1.50m,地下水位在地面以下1.50m,基础底面的设计荷载为350KN/m,地基土分布:第一层土厚度为3米,天然重度γ=20.0kN/m3,压缩模量Es=12MPa;第二层为软弱下卧层,其厚度为5米,天然重度γ=18.0kN/m3,压缩模量Es=4MPa;扩散到软弱下卧层顶面的附加压力pz最接近于下列哪一个数值?()
A 78kPa;
B 89kPa;
C 109kPa;
D 143kPa。
有一条形基础,宽b=3.0m,埋深d=2.0m,地基土为砂土,其饱和重度为21kN/m3,内摩擦角φ=30°,地下水位与地面齐平,求:
①地基土的极限荷载(Nγ=20,Nq=22.4,Nc=37) 。
②若提高此地基承载力,应采取哪些措施。
某条形基础,底宽b=1.5m,埋深d=2m,地基土的重度γ=18kN/m3,饱和重度γsat=19kN/m3,抗剪强度指标为c=10kPa,ψ=20°,地下水位埋深为1.5m,试求该地基的Pcr和。
表 临塑荷载pcr及临界荷载p_{frac{1}{4}}的承载力Nr、Nq、Nc值 | |||||||
ψ(°) | Nr | Nq | Nc | ψ(°) | Nr | Nq | Nc |
0 | 0 | 1.00 | 3.14 | 22 | 0.61 | 3.44 | 6.04 |
2 | 0.03 | 1.12 | 3.32 | 24 | 0.72 | 3.87 | 6.45 |
4 | 0.06 | 1.25 | 3.51 | 26 | 0.84 | 4.37 | 6.90 |
6 | 0.10 | 1.39 | 3.71 | 28 | 0.98 | 4.93 | 7.40 |
8 | 0.14 | 1.55 | 3.93 | 30 | 1.15 | 5.59 | 7.95 |
10 | 0.18 | 1.73 | 4.17 | 32 | 1.34 | 6.35 | 8.55 |
12 | 0.23 | 1.94 | 4.42 | 34 | 1.55 | 7.21 | 9.22 |
14 | 0.29 | 2.17 | 4.69 | 36 | 1.81 | 8.25 | 9.97 |
16 | 0.36 | 2.43 | 5.00 | 38 | 2.11 | 9.44 | 10.80 |
18 | 0.43 | 2.72 | 5.31 | 40 | 2.46 | 10.84 | 11.73 |
20 | 0.51 | 3.06 | 5.66 | 45 | 3.66 | 15.64 | 14.64 |
A.10cm
B. 8cm
C. 6cm
D. 4cm
A.-0.45m,0.4m,0.92m
B.-0.12m,0.5m,0.92m
C.-0.12m,0.4m,1.92m
D.-1.12m,0.4m,0.92m
A.-0.45m,0.4m,0.92m
B.-0.12m,0.5m,0.92m
C.-0.12m,0.4m,1.92m
D.-1.12m,0.4m,0.92m