土力学与地基基础习题二

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1、地基承载习题第八章第一节习题一 有一条形基础,如图所示,基础宽度b=3m，埋深d=2m，作用在基础底面的均布荷载P=190KPa。已知土的内摩擦角φ=15°，粘聚力C=15KPa，容重γ=18KN/m3。求此时地基中的塑性范围？步骤1：地基中塑性区边界线的表达式为步骤2：塑性区边界线计算α(°)15202530354045505510.52sin2α-5.45α-5.115.26-1.43-5.116.76-1.90-5.118.06-2.38-5.119.11-2.86-5.119.88-3.

2、33-5.1110.36-3.81-5.1110.52-4.28-5.1110.35-4.75-5.119.88-5.22-5.11Z(m)-1.28-0.250.571.141.441.441.130.49-0.45步骤3：第八章第一节习题二 已知地基土的容重γ=18.5KN/m3，粘聚力C=15KPa，内摩擦角φ=18°，条基宽度b=2.4m，埋深d=1.6m，试求该地基的Pcr？9 步骤1：步骤2：表8-1临塑荷载Pcr及临界荷载P1/4的承载力系数Nr、Nq、Nc值φ(度)NrNqNcφ

3、(度)NrNqNc001.003.14220.613.446.0420.031.123.32 240.723.876.4540.061.253.51 260.844.376.9060.101.393.71 280.984.937.4080.141.553.93 301.155.597.95100.181.734.17 321.346.358.55120.231.944.42 341.557.219.22140.292.174.69 361.818.259.97160.362.435.00 382

4、.119.4410.80180.432.725.31 402.4610.8411.73200.513.065.66 453.6615.6414.64第八章第一节习题三 已知有一条形基础，基础宽度b=3m，埋深d=2m，作用在基础底面的均布荷载P=190KPa。已知土的内摩擦角φ=15°，粘聚力C=15KPa，容重γ=18KN/m3。试求该地基的界限荷载P1/3，P1/4？  步骤1：表8-1临塑荷载Pcr及临界荷载P1/4的承载力系数Nr、Nq、Nc值φ(度)NrNqNcφ(度)NrNqNc00

5、1.003.14220.613.446.0420.031.123.32 240.723.876.45940.061.253.51 260.844.376.9060.101.393.71 280.984.937.4080.141.553.93 301.155.597.95100.181.734.17 321.346.358.55120.231.944.42 341.557.219.22140.292.174.69 361.818.259.97160.362.435.00 382.119.4410.

6、80180.432.725.31 402.4610.8411.73200.513.065.66 453.6615.6414.64步骤2：第八章第一节习题四 已知有一条形基础，基础宽度b=3m，埋深d=2m，作用在基础底面的均布荷载P=190KPa。已知土的内摩擦角φ=15°，粘聚力C=15KPa，容重γ=18KN/m3。试求条形基础的临塑荷载Pcr和界限荷载P1/4？ 步骤1：查表得：表8-1临塑荷载Pcr及临界荷载P1/4的承载力系数Nr、Nq、Nc值φ(度)NrNqNcφ(度)NrNqNc0

7、01.003.14220.613.446.0420.031.123.32 240.723.876.4540.061.253.51 260.844.376.9060.101.393.71 280.984.937.4080.141.553.93 301.155.597.95100.181.734.17 321.346.358.55120.231.944.42 341.557.219.22140.292.174.69 361.818.259.97160.362.435.00 382.119.4410.

8、80180.432.725.31 402.4610.8411.73200.513.065.66 453.6615.6414.64第八章第一节习题五 某条形基础，基底宽b=1.5m，埋深d=2m，地基土的重度γ=19KN/m3，饱和土的重度γsat=21KN/m3，抗剪强度指标φ=20°，C=20KPa，地下水埋深为1.5m，试求该地基的界限荷载P1/4？步骤1：9表8-1临塑荷载Pcr及临界荷载P1/4的承载力系数Nr、Nq、Nc值φ(度)NrNqNcφ(度)NrNqNc001.003.1422