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1、地基承載習(xí)題第八章第一節(jié)習(xí)題一?有一條形基礎(chǔ),如圖所示,基礎(chǔ)寬度b=3m，埋深d=2m，作用在基礎(chǔ)底面的均布荷載P=190KPa。已知土的內(nèi)摩擦角φ=15°，粘聚力C=15KPa，容重γ=18KN/m3。求此時地基中的塑性范圍？步驟1：地基中塑性區(qū)邊界線的表達(dá)式為步驟2：塑性區(qū)邊界線計算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步驟3：第八章第一節(jié)習(xí)題二?已知地基土的容重γ=18.5KN/m3，粘聚力C=15KPa，內(nèi)摩擦角φ=18°，條基寬度b=2.4m，埋深d=1.6m，試求該地基的Pcr？9?步驟1：步驟2：表8-1臨塑荷載Pcr及臨界荷載P1/4的承載力系數(shù)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第八章第一節(jié)習(xí)題三?已知有一條形基礎(chǔ)，基礎(chǔ)寬度b=3m，埋深d=2m，作用在基礎(chǔ)底面的均布荷載P=190KPa。已知土的內(nèi)摩擦角φ=15°，粘聚力C=15KPa，容重γ=18KN/m3。試求該地基的界限荷載P1/3，P1/4？??步驟1：表8-1臨塑荷載Pcr及臨界荷載P1/4的承載力系數(shù)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步驟2：第八章第一節(jié)習(xí)題四?已知有一條形基礎(chǔ)，基礎(chǔ)寬度b=3m，埋深d=2m，作用在基礎(chǔ)底面的均布荷載P=190KPa。已知土的內(nèi)摩擦角φ=15°，粘聚力C=15KPa，容重γ=18KN/m3。試求條形基礎(chǔ)的臨塑荷載Pcr和界限荷載P1/4？?步驟1：查表得：表8-1臨塑荷載Pcr及臨界荷載P1/4的承載力系數(shù)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第八章第一節(jié)習(xí)題五?某條形基礎(chǔ)，基底寬b=1.5m，埋深d=2m，地基土的重度γ=19KN/m3，飽和土的重度γsat=21KN/m3，抗剪強度指標(biāo)φ=20°，C=20KPa，地下水埋深為1.5m，試求該地基的界限荷載P1/4？步驟1：9表8-1臨塑荷載Pcr及臨界荷載P1/4的承載力系數(shù)Nr、Nq、Nc值φ(度)NrNqNcφ(度)NrNqNc001.003.1422
