soils土的抗剪强度.ppt

《soils土的抗剪强度.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、§5Shearstrengthofsoils/土的抗剪强度ShearfailureandCoulombCriterion/剪切破坏与库仑定律Stresslimitequilibrium/土中一点的极限平衡Sheartest/抗剪强度试验Stresspath/应力路径Rheologyandresidualstrength/土的流变与残余强度5.1ShearfailureandCoulombCriterion剪切破坏与库仑定律SlopesinHighway5.1.1Shearfailureofsoils/土的剪切破坏τ=sτ=τf5.1.2Directsheartesta

2、ndCoulombCriterion/直剪试验与库仑定律Shearboxonsand/砂土直剪试验←Returnc-cohension（粘聚力）kPaφ-frictionangle,angleofshearingresistance（内摩擦角）(OnNon-cohesivesoils/无粘性土)(OnCohesivesoils/粘性土)5.2Stresslimitequilibrium/土中一点的应力极限平衡5.2.1MohrStresscircle/莫尔应力圆5.2.2Pole(Originofplane/极点)5.2.3Stresslimitequilibrium

3、(Mohr-CoulombFailureCriterion)土的极限[平衡条件（莫尔——库仑准则）LimitStressCircleforNon-Cohesive/无粘性土的极限应力圆LimitStressCircleforCohesiveSoils粘性土的极限应力圆←Return5.3ShearTest/抗剪强度试验Unconfinedcompressiontest/无侧限抗压强度试验Forsoftclay,φisconsideredas0,对饱和的软粘土，φ=0无侧限抗压强度试验原理Triaxialtest/三轴剪切试验三轴剪切试验原理TotalStressCir

4、cle总应力圆EffectiveStressCircle有效应力圆typestest-UU(Unconsolidatedundrainedtest不固结不排水剪——快剪)-CU(consolidatedundrainedtest固结不排水剪——固结快剪)-CD(consolidateddrainedtest固结排水剪——慢剪)(a)SaturatedSoil(b)UnSaturatedSoilUU(Unconsolidatedundrainedtest/不固结不排水剪)-CU(consolidatedundrainedtest/固结不排水剪)-CD(consolida

5、teddrainedtest/固结排水剪)UUCUCDInsituVanetest/十字板剪切试验←Return5.4StressPath/应力路径NormallyconsolidatedsoilsOverconsolidatedsoils正常固结土超固结土