重塑黏土和原状粉质黏土的动力特性试验研究
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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。
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.
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.
引文
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[2]MAIR R J.Developments in geotechnical engineeringresearch:Application to tunnels and deep excavations[J].Proc.Institute Civil Engineering London,1993(3):27-41.
[3]石兆吉,丰万玲,张占吉,等.土壤动压缩模量的共振柱法测定[J].岩土工程学报,1985,7(6):25-32.SHI Zhao-ji,FENG Wan-ling,ZHANG Zhan-ji,et al.The measurement of dynamic young/s modulus byresonant column method[J].Chinese Journal ofGeotechnical Engineering,1985,7(6):25-32.
[4]顾尧章.海底黏土的剪切模量[J].岩土工程学报,1995,7(2):29-35.GU Yao-zhang.Shear modulus of the marine clay[J].Chinese Journal of Geotechnical Engineering,1995,7(2):29-35.
[5]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.YUAN Xiao-ming,SUN Rui,SUN Jing et al.Laboratoryexperimental study on dynamic shear modulus ratio anddamping ratio of soils[J].Earthquake Engineering andEngineering Vibration,2000,20(4):133-139.
[6]郭中华,余湘娟,严蕴.循环荷载作用软土计算模型初探[J].河海大学学报,2002,30(1):109-112GUO Zhong-hua;YU Xiang-juan;YAN Yun.Discussionon calculation model for soft soil under cyclic loading[J]Journal of Hehai University,2002,30(1):109-112.
[7]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
[8]何昌荣.动模量和阻尼的动三轴试验研究[J].岩土工程学报,1997,19(2):39-48.HE Chang-rong.Dynamic triaxial test on modulus anddamping[J].Chinese Journal of Geotechnical Engineering,1997,19(2):39-48.
[9]王权民,李刚,陈正汉,等.厦门砂土的动力特性研究[J].岩土力学.2005,26(10):1628-1632.WANG Quan-min;LI Gang;CHEN Zheng-han,et al.Research on dynamic characteristics of sands in Xiamencity[J].Rock and Soil Mechanics,2005,26(10):1628-1632.
[10]郭莹,刘洋.确定动模量与阻尼比的试验技术研究[C].第七届全国土动力学学术会议论文集,北京:清华大学出版社,2006,266-269.
[11]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程与工程振动,1995,15(1):73-84.CHEN Guo-xing,XIE Jun-fei,ZHANG Ke-xu.Theempirical evaluation of soil moduli and damping ratio fordynamic analysis[J].Earthquake Engineering andEngineering Vibration,1995,15(1):73-84.
[12]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):125-131.WU Shi-ming,XU You-zai.State-of-art and developmentof soil dynamics[J].Chinese Journal of GeotechnicalEngineering,1998,20(3):125-131.
[13]齐剑峰,聂影,赵维,等.室内黏土试样制备技术的改进及应用[C].土工测试技术实践与发展(第24届全国土工测试学术研讨会论文集),郑州:黄河水利出版社,2005,123-126.
[14]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,2000.
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