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重塑黏土和原状粉质黏土的动力特性试验研究

Dynamic Properties of Saturated Clay and Undisturbed Silty Clay

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【作者】 聂影肖启华梁义聪

【Author】 NIE Ying1,2,XIAO Qi-hua2,LIANG Yi-cong2(1.School of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian 116085,P.R.China;2.Institute of Construction Engineering,CISDI Engineering Co.Ltd.,Chongqing 400013,P.R.China)

【机构】 大连理工大学土木水利学院中冶赛迪工程技术股份有限公司建工部

【摘要】 试验采用单个空心试样振后固结再振的动扭剪方法与采用多个试样的常规动扭剪方法,针对重塑黏土、原状粉质黏土探讨了不同方法下两种土样的动力特性。试验结果表明:单个试样振后固结再振得到的动剪切模量G、阻尼比ξ与用多个试样的常规动扭剪方法得到的试验结果比较接近,可以认为在小应变下采用单个试样振后固结再振的试验方法是比较可靠的。同时发现卸压时的G随着固结压力的减少而降低,下降的梯度比加压时的小。重塑黏土和原状粉质黏土的G/Gmax~γ和ξ/ξmax~γ基本与试验方法和围压无关,并对模型中有关参数的影响因素做出了初步的探讨,给出了归一化动力变形关系曲线。采用单个试样进行振后固结再振的方法具有节省取样数量和减小试验操作、试样差异等因素对试验结果分析的影响,并且在试验结果可靠的基础上能够提供很多便利。

【Abstract】 The apparatus for static and dynamic universal triaxial and torsional shear soil testing was employed to perform stress-controlled cyclic torsional shear testing under isotropic consolidated conditions.We conducted a dynamic torsion test of a single hollow sample to obtain its dynamic property data at different effective confining pressures with saturated clay and disturbed silty clay.The results show that the maximum dynamic shear modulus Gmax and ξ obtained from single sample of the cyclic shear test approached those of the traditional method of dynamic torsional testing.We indicate that G/Gmax~γ and/max~γ of the two soils are independent of confining pressure and testing methods.Each G and can be obtained from the equations we provide.Furthermore,the single sample test method can diminish the differences between the samples during experimentation and effectively provide convenience with authentic experimental results.

【基金】 国家自然科学基金资助项目(50579006,50639010);国家自然科学基金重点基金资助项目(50439010)
  • 【文献出处】 重庆建筑大学学报 ,Journal of Chongqing Jianzhu University , 编辑部邮箱 ,2008年06期
  • 【分类号】TU435;TU442
  • 【被引频次】8
  • 【下载频次】145
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