改进的判别砂土液化势的剪切波速法
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摘要
依据动三轴试验 ,提出 Gmax(k Pa)与 (σd/2 ) 1/2 (k Pa) 1/2成线性关系 ,并且对于不同地区的砂土 ,能够根据 emin进行初步归一 ,从而提出了适用于一般砂土的简化临界剪切波速公式 .该公式明确体现出临界剪切波速与深度、地震加速度等成 1 /4次方关系 ,采用它能够合理地解释液化可能性随深度增加而减少的现象 .通过与其他学者提出的方法以及动三轴试验结果的对比表明 ,本文的方法简单而有效
According to the result of cyclic triaxial tests, a correlation between liquefaction resistance and elastic shear modulus is presented. It shows that G max (kPa) is in linear relation with ( σ d /2) 1/2 (kPa) 1/2 . Applying to soils from different sites, the correlation can be normalized according to its minimum void ratio. From the above results, an improved method is established to evaluate the liquefaction potential with shear wave velocity. The critical shear wave velocity of liquefaction is in linear relation with 1/4 power of depth and the maximum acceleration during earthquakes. The phenomenon that the possibility of liquefaction decreases with the increment of the depth can be explained rationally by the method proposed in this paper. Compared with previous methods and the results of cyclic triaxial tests, this method is simpler and more effective.
According to the result of cyclic triaxial tests, a correlation between liquefaction resistance and elastic shear modulus is presented. It shows that G max (kPa) is in linear relation with ( σ d /2) 1/2 (kPa) 1/2 . Applying to soils from different sites, the correlation can be normalized according to its minimum void ratio. From the above results, an improved method is established to evaluate the liquefaction potential with shear wave velocity. The critical shear wave velocity of liquefaction is in linear relation with 1/4 power of depth and the maximum acceleration during earthquakes. The phenomenon that the possibility of liquefaction decreases with the increment of the depth can be explained rationally by the method proposed in this paper. Compared with previous methods and the results of cyclic triaxial tests, this method is simpler and more effective.
引文
石兆吉 .1986.判别水平土层液化势的剪切波速法 [J] .水文地质和工程地质 ,( 4 ) :9～ 10
石兆吉 ,郁寿松 ,丰万玲 .1993.土壤液化势的剪切波速判别法 [J] .岩土工程学报 ,15( 1) :74～ 80
De Alba P,Baldwon K,Janoo V,etal.1984 .Elastic- wavevelocitiesand liquefaction potential[J] .Geotech Testing J,7( 2 ) :77～ 88
Dobry R,Powell D J.1980 .Liquefaction potential ofsaturated sand- the stiffness method[A] .Proceedingsof Seventh WorldConference on Earthquake Engineering[C] .3:2 5～ 32
Dobry R,Stokoe K H,Ladd R S,et al.1981.Susceptibility from S- wave velocity in- situ testing to evaluate liquefactionsusceptibility[J] ,J Geotech Engrg Div,10 7:81～ 54 4
Hardin B O,Drenvich V P.1972 .Shearmoduleand dam ping in soils:Design equationsand curves[J] .J soil mech and FandDiv,98:667～ 692
Hardin B D,Richart F E.1963.Elastic wave velocities in granularsoils[J] .J Soils Mech And Found Div,89( SM1) :33～65
Sakai Y,Yasuda S.1979.Liquefaction characteristicsof undisturbed sandy soils[A ] .Proceedings12 th Annual Meeting[C] .389～ 392
Seed H B.1979.Soil liquefaction and cyclic mobility evaluation for level ground during earthquakes[J] .J Geotech EngrgDiv,10 5( GT2 ) :2 0 1～ 2 55
Stokoe K H,Rosset J M.1988.Liquefaction potential of sands from shear wave velocity[A] .Proceedings,N inth WorldConference on Earthquake Engineering[C] .3:2 13～ 2 18
Tokim atsu K,U chida A .1990 .Correlation between liquefaction resistance and shear wave velocity [J] .Soils andFoundations,30 ( 2 ) :33～ 4 2
Tokim atsu K,Yamazaki T,Yoshimi Y.1986.Soil liquefaction evaluation by elastic shearmoduli[J] .Soilsand Foundations,2 6( 1) :2 5～ 35
石兆吉 ,郁寿松 ,丰万玲 .1993.土壤液化势的剪切波速判别法 [J] .岩土工程学报 ,15( 1) :74～ 80
De Alba P,Baldwon K,Janoo V,etal.1984 .Elastic- wavevelocitiesand liquefaction potential[J] .Geotech Testing J,7( 2 ) :77～ 88
Dobry R,Powell D J.1980 .Liquefaction potential ofsaturated sand- the stiffness method[A] .Proceedingsof Seventh WorldConference on Earthquake Engineering[C] .3:2 5～ 32
Dobry R,Stokoe K H,Ladd R S,et al.1981.Susceptibility from S- wave velocity in- situ testing to evaluate liquefactionsusceptibility[J] ,J Geotech Engrg Div,10 7:81～ 54 4
Hardin B O,Drenvich V P.1972 .Shearmoduleand dam ping in soils:Design equationsand curves[J] .J soil mech and FandDiv,98:667～ 692
Hardin B D,Richart F E.1963.Elastic wave velocities in granularsoils[J] .J Soils Mech And Found Div,89( SM1) :33～65
Sakai Y,Yasuda S.1979.Liquefaction characteristicsof undisturbed sandy soils[A ] .Proceedings12 th Annual Meeting[C] .389～ 392
Seed H B.1979.Soil liquefaction and cyclic mobility evaluation for level ground during earthquakes[J] .J Geotech EngrgDiv,10 5( GT2 ) :2 0 1～ 2 55
Stokoe K H,Rosset J M.1988.Liquefaction potential of sands from shear wave velocity[A] .Proceedings,N inth WorldConference on Earthquake Engineering[C] .3:2 13～ 2 18
Tokim atsu K,U chida A .1990 .Correlation between liquefaction resistance and shear wave velocity [J] .Soils andFoundations,30 ( 2 ) :33～ 4 2
Tokim atsu K,Yamazaki T,Yoshimi Y.1986.Soil liquefaction evaluation by elastic shearmoduli[J] .Soilsand Foundations,2 6( 1) :2 5～ 35
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