soils土的抗剪強(qiáng)度.ppt

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1、§5Shearstrengthofsoils/土的抗剪強(qiáng)度ShearfailureandCoulombCriterion/剪切破壞與庫侖定律Stresslimitequilibrium/土中一點(diǎn)的極限平衡Sheartest/抗剪強(qiáng)度試驗(yàn)Stresspath/應(yīng)力路徑Rheologyandresidualstrength/土的流變與殘余強(qiáng)度5.1ShearfailureandCoulombCriterion剪切破壞與庫侖定律SlopesinHighway5.1.1Shearfailureofsoils/土的剪切破壞τ=sτ=τf5.1.2Directsheartesta

2、ndCoulombCriterion/直剪試驗(yàn)與庫侖定律Shearboxonsand/砂土直剪試驗(yàn)←Returnc-cohension（粘聚力）kPaφ-frictionangle,angleofshearingresistance（內(nèi)摩擦角）(OnNon-cohesivesoils/無粘性土)(OnCohesivesoils/粘性土)5.2Stresslimitequilibrium/土中一點(diǎn)的應(yīng)力極限平衡5.2.1MohrStresscircle/莫爾應(yīng)力圓5.2.2Pole(Originofplane/極點(diǎn))5.2.3Stresslimitequilibrium

3、(Mohr-CoulombFailureCriterion)土的極限[平衡條件（莫爾——庫侖準(zhǔn)則）LimitStressCircleforNon-Cohesive/無粘性土的極限應(yīng)力圓LimitStressCircleforCohesiveSoils粘性土的極限應(yīng)力圓←Return5.3ShearTest/抗剪強(qiáng)度試驗(yàn)Unconfinedcompressiontest/無側(cè)限抗壓強(qiáng)度試驗(yàn)Forsoftclay,φisconsideredas0,對(duì)飽和的軟粘土，φ=0無側(cè)限抗壓強(qiáng)度試驗(yàn)原理Triaxialtest/三軸剪切試驗(yàn)三軸剪切試驗(yàn)原理TotalStressCir

4、cle總應(yīng)力圓EffectiveStressCircle有效應(yīng)力圓typestest-UU(Unconsolidatedundrainedtest不固結(jié)不排水剪——快剪)-CU(consolidatedundrainedtest固結(jié)不排水剪——固結(jié)快剪)-CD(consolidateddrainedtest固結(jié)排水剪——慢剪)(a)SaturatedSoil(b)UnSaturatedSoilUU(Unconsolidatedundrainedtest/不固結(jié)不排水剪)-CU(consolidatedundrainedtest/固結(jié)不排水剪)-CD(consolida

5、teddrainedtest/固結(jié)排水剪)UUCUCDInsituVanetest/十字板剪切試驗(yàn)←Return5.4StressPath/應(yīng)力路徑NormallyconsolidatedsoilsOverconsolidatedsoils正常固結(jié)土超固結(jié)土