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【单选题】
饱和粘性土试样在三轴仪中进行固结不排水剪切试验，施加的围压σ3是196kPa，试样破坏时的主应力差σ1-σ3=274kPa，测得孔隙水压力u=176kPa，如果破裂面与水平面成α=58°角，试求破坏面上的正应力。()A.
σ=273kpa
B.
σ=283kpa
C.
σ=2903kpa
D.
σ=260kpa
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A.
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B.
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C.
among, when
D.
among, where
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A.
正确
B.
错误
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