地铁隧道周围粉质黏土动力参数试验研究
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摘要
利用GDS共振柱试验仪,对地铁隧道周围粉质黏土进行动力参数(动剪切模量和阻尼比)研究,分析在不同围压试验条件下三种粉质黏土动剪切模量和阻尼比变化规律。试验结果表明:随着动剪应变的增大,动剪切模量逐渐减小,阻尼比逐渐增大;围压越大,动剪切模量越大,阻尼比越小,且围压对动剪切模量的影响效果要显著于阻尼比;液性指数越小的土体,围压对阻尼比的影响效果越显著;最大动剪切模量与围压、参考剪应变与围压、最大阻尼比与围压均存在较好的线性关系。
The dynamic parameters(dynamic shear modulus and damping ratio) of a silty clay surrounding the metro tunnel were studied by using the GDS resonant column test and the dynamic shear modulus and damping ratio of the silty clay samples were analyzed under different confining pressures. The results show that, with the increase of dynamic shear strain, the dynamic shear modulus decreases and the damping ratio increases; with the increase of confining pressure, the dynamic shear modulus increases and the damping ratio decreases and the effect of confining pressures on the dynamic shear modulus is more significant than that of the damping ratio; the liquid index has smaller effect, the effect of the confining pressure on the damping ratio is more obvious; the relationships between the maximum dynamic shear modulus and the confining pressure, the reference shear strain and the confining pressure, the maximum damping ratio and confining pressure has a good linear relationship.
The dynamic parameters(dynamic shear modulus and damping ratio) of a silty clay surrounding the metro tunnel were studied by using the GDS resonant column test and the dynamic shear modulus and damping ratio of the silty clay samples were analyzed under different confining pressures. The results show that, with the increase of dynamic shear strain, the dynamic shear modulus decreases and the damping ratio increases; with the increase of confining pressure, the dynamic shear modulus increases and the damping ratio decreases and the effect of confining pressures on the dynamic shear modulus is more significant than that of the damping ratio; the liquid index has smaller effect, the effect of the confining pressure on the damping ratio is more obvious; the relationships between the maximum dynamic shear modulus and the confining pressure, the reference shear strain and the confining pressure, the maximum damping ratio and confining pressure has a good linear relationship.
引文
[1] 刘峰.软土地区地铁隧道长期沉降及对地铁安全的影响[D].南京:南京大学,2013.
[2] 唐益群,赵化,王元东,等.地铁荷载下隧道周围加固软黏土应变累积特性[J].同济大学学报(自然科学版),2011(7):972-977.
[3] 雷勇.地铁行车荷载作用下黏性土动力特性试验研究[D].沈阳:沈阳建筑大学,2018.
[4] Hardin B O,Drnevich V P.Shear modulus and damping in soil measurement and parameter effects [J].Journal of Soil Mechanics and Foundations Division,1972,98(6):603-624.
[5] 连玉平,张颖,蔡辉腾,等.福建漳州地区典型土动力特性的试验研究[J].西北地震学报,2010,32(4):363-366.
[2] 唐益群,赵化,王元东,等.地铁荷载下隧道周围加固软黏土应变累积特性[J].同济大学学报(自然科学版),2011(7):972-977.
[3] 雷勇.地铁行车荷载作用下黏性土动力特性试验研究[D].沈阳:沈阳建筑大学,2018.
[4] Hardin B O,Drnevich V P.Shear modulus and damping in soil measurement and parameter effects [J].Journal of Soil Mechanics and Foundations Division,1972,98(6):603-624.
[5] 连玉平,张颖,蔡辉腾,等.福建漳州地区典型土动力特性的试验研究[J].西北地震学报,2010,32(4):363-366.