福州市闽江下游防洪堤饱和地基土动力特性试验研究
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摘要
结合动三轴和共振柱试验,对福州市闽江下游防洪堤饱和地基土的动模量和阻尼比的发展规律及其影响因素进行了研究.试验结果表明,地基土体的动剪切模量和阻尼比随动剪应变幅变化趋势相似,动剪切模量随动剪应变幅的增大而减小,阻尼比随动剪应变幅的增大而增大,变化过程大致可分为平缓—快速—平缓3个阶段.固结压力对归一化的动剪切模量比和阻尼比影响不大,阻尼比随土中粘粒含量的增多而增大.由动强度试验结果可知,固结应力比Kc对土的动强度影响较大,在初始应力水平相同时,动强度随Kc的增大而增大.
Based on dynamic triaxial tests and the resonant column apparatus tests,the characteristics of dynamic shear modulus and damping ratio of saturated foundation soils of flood control levee in the lower reaches of the Min river in Fuzhou city were studied in detail.The experiment results indicated that the relationships of dynamic shear modulus and damping ratio versus dynamic shear strain of different foundation soils showed a similar tendency that the dynamic shear modulus will decrease with the dynamic shear strain increase,while the damping ratio will increase at the same time,and the process can be divided into three stages of smooth-rapid-smooth.The influence of consolidation pressure on normalized dynamic shear modulus or damping ratio was not significant,and the damping ratio will increase with clay content increase.Experimental results of dynamic strength have shown that the influence of the ratio of consolidation stress on dynamic strength was significant,dynamic strength will increase with the raise of Kc when the initial consolidation pressure is the same.
Based on dynamic triaxial tests and the resonant column apparatus tests,the characteristics of dynamic shear modulus and damping ratio of saturated foundation soils of flood control levee in the lower reaches of the Min river in Fuzhou city were studied in detail.The experiment results indicated that the relationships of dynamic shear modulus and damping ratio versus dynamic shear strain of different foundation soils showed a similar tendency that the dynamic shear modulus will decrease with the dynamic shear strain increase,while the damping ratio will increase at the same time,and the process can be divided into three stages of smooth-rapid-smooth.The influence of consolidation pressure on normalized dynamic shear modulus or damping ratio was not significant,and the damping ratio will increase with clay content increase.Experimental results of dynamic strength have shown that the influence of the ratio of consolidation stress on dynamic strength was significant,dynamic strength will increase with the raise of Kc when the initial consolidation pressure is the same.
引文
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[8]阎金安,王武林.尾矿砂的动力特性研究[J].岩土力学,1990,11(4):69-74.
[9]栾茂田,何杨,许成顺,等.黄河三角洲粉土循环剪切特性的试验研究[J].岩土力学,2008,29(12):3 211-3 216.
[2]吴世明,徐攸在.土动力学现状与发展[J].岩土工程学报,1998,20(3):125-130.
[3]齐剑峰,栾茂田,杨庆,等.饱和黏土动剪切模量与阻尼比的试验研究[J].岩土工程学报,2008,30(4):519-523.
[4]Hardin B O,Drnevich V P.Shear modulus and damping in soils:measurement and parameter effects[J].Journal of the SoilMechanics and Foundations Division,ASCE,1972,98(6):603-624.
[5]Hardin B O.Vibration modulus of normally consolidated clay:design equations and curves[J].Journal of the Soil Mechanicsand Foundations Division,ASCE,1968,94(2):353-369.
[6]袁晓铭,孙锐,孙静,等.常规土类动剪切模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4):133-139.
[7]张茹,何昌荣,费文平,等.固结应力比对土样动强度和动孔压发展规律的影响[J].岩土工程学报,2006,28(1):101-105.
[8]阎金安,王武林.尾矿砂的动力特性研究[J].岩土力学,1990,11(4):69-74.
[9]栾茂田,何杨,许成顺,等.黄河三角洲粉土循环剪切特性的试验研究[J].岩土力学,2008,29(12):3 211-3 216.
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