粉土的动力特性及液化势研究
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摘要
本文对典型的粉土进行了试验研究。结合共振柱和动三轴试验结果 ,得到了 G/Gmax～γ/γr 和 D～γ曲线。在动三轴仪上 ,安装了压电陶瓷弯曲元用以测试土样的 Gmax,并通过先期振动控制试样Gmax,在土样密度和 Gmax同时与现场土体一致的情况下 ,进行了应变控制的动三轴液化试验。根据试验结果 ,给出了粉土在不同的地震震级下的临界剪应变变化范围和均值。
Test and research on typical silt are conducted herein. G/G max ~ γ/γ r and D～γ curves are acquired by combining the test results of resonant column and cyclic triaxial tests.Bender element system is installed on the triaxial apparatus to measure the G max of soil sample.Strain controlled triaxial liquefaction tests are conducted under the condition when the density of soil samples and G max are both the same with those of soil mass in the field. The variation range and mean value of critical shear strain of silt during different seismic intensities are given based on the test results.
Test and research on typical silt are conducted herein. G/G max ~ γ/γ r and D～γ curves are acquired by combining the test results of resonant column and cyclic triaxial tests.Bender element system is installed on the triaxial apparatus to measure the G max of soil sample.Strain controlled triaxial liquefaction tests are conducted under the condition when the density of soil samples and G max are both the same with those of soil mass in the field. The variation range and mean value of critical shear strain of silt during different seismic intensities are given based on the test results.
引文
[1] De Alba,P.,Baldwin,K.,Janoo,V.,Roe,G.and Celikkol,B.Elastic-wave Velocities and Liqufaction Potential.Geotech-nical Testing Journal,Vol.7,No.2 ,pp.77-88,1984.
[2 ] Tokimatsu,K.,Yamazaki,T.and Yoshimi Y.Soil liquefactionevaluations by elastic shear moduli.Soils and Foundations,Vol.2 6 ,pp.2 3-35 ,1986 .
[3] 刘小生 ,赵冬 ,汪闻韶 .原状结构性对砂土动力变形特性的影响试验 .水利学报 ,第 2期 ,1993.
[4] Yokel F.Y.,Dobry R.,Powell D.J.and Ladd R.S.Liquefactionof Sands During Earthquakes-The Cyclic Strain Approach.In-ternational Symposium on Soils under Cyclcic and TransientL oading,Swansea.pp.5 71-5 80 ,1980 .
[5 ] L i,X.S.,Yang,W.L.,Shen,C.K.and Wang,W.C.Energy-Injecting Virtual Mass Resonant Column System.Jour-nal of Geotechnical and Geoenvironmental Engineering Vol.12 4,No.5 ,pp.42 8-4 38,1998.
[6 ] 石兆吉 ,郁寿松 ,丰万玲 .土壤液化势的剪切波速判别法 .岩土工程学报 ,Vol.15 ,No.1,pp.74-80 ,1993.
[7] 刘颖 ,谢君斐等 .砂土震动液化 .地震出版社 ,pp.134,1984.
[8] 黄博 ,殷建华 ,陈云敏 ,吴世明 .压电陶瓷弯曲元法测试土样弹性剪切模量 ,振动工程学报录用 .
[9] 黄博 ,陈云敏 ,殷建华 ,吴世明 .控制试样初始剪切模量的动三轴液化试验 ,岩土工程学报录用 .
[2 ] Tokimatsu,K.,Yamazaki,T.and Yoshimi Y.Soil liquefactionevaluations by elastic shear moduli.Soils and Foundations,Vol.2 6 ,pp.2 3-35 ,1986 .
[3] 刘小生 ,赵冬 ,汪闻韶 .原状结构性对砂土动力变形特性的影响试验 .水利学报 ,第 2期 ,1993.
[4] Yokel F.Y.,Dobry R.,Powell D.J.and Ladd R.S.Liquefactionof Sands During Earthquakes-The Cyclic Strain Approach.In-ternational Symposium on Soils under Cyclcic and TransientL oading,Swansea.pp.5 71-5 80 ,1980 .
[5 ] L i,X.S.,Yang,W.L.,Shen,C.K.and Wang,W.C.Energy-Injecting Virtual Mass Resonant Column System.Jour-nal of Geotechnical and Geoenvironmental Engineering Vol.12 4,No.5 ,pp.42 8-4 38,1998.
[6 ] 石兆吉 ,郁寿松 ,丰万玲 .土壤液化势的剪切波速判别法 .岩土工程学报 ,Vol.15 ,No.1,pp.74-80 ,1993.
[7] 刘颖 ,谢君斐等 .砂土震动液化 .地震出版社 ,pp.134,1984.
[8] 黄博 ,殷建华 ,陈云敏 ,吴世明 .压电陶瓷弯曲元法测试土样弹性剪切模量 ,振动工程学报录用 .
[9] 黄博 ,陈云敏 ,殷建华 ,吴世明 .控制试样初始剪切模量的动三轴液化试验 ,岩土工程学报录用 .
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