| 低幅值小应变振动下土体弹性刚度的非线性特征与表述方法 |
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| 引用本文： | 贾鹏飞,孔令伟,王 勇,杨爱武.低幅值小应变振动下土体弹性刚度的非线性特征与表述方法[J].岩土力学,2013,34(11):3145-3150. |
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| 作者姓名： | 贾鹏飞 孔令伟 王 勇 杨爱武 |
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| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071； 2. 西北大学 地质学系 大陆动力学国家重点实验室，西安 710069 |
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| 基金项目： | 国家自然科学基金项目(No. 51179186，No. 51109208，No. 41302219)；湖北省自然科学基金(No. 2011CDB407)。 |
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| 摘 要： | 随着高速铁路建设的兴起，轨道以及沿线附近建筑物承受低幅值小应变振动荷载的作用。对于小应变振动下土体的有限元计算，如何确定连接应力和应变之间纽带的刚度张量E，对于建立合理的预测模型来分析高速铁路轨道以及沿线建筑物的沉降变形至关重要。低幅值小应变振动下剪切模量G和阻尼比D随剪应变幅值的变化是反映土体刚度及阻尼特征最重要的两个参数。通过共振柱试验发现，振动荷载作用下土体的剪切模量G必须通过振动应变幅值和固结围压共同来确定，即使在小应变（剪应变幅值10-6
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| 关 键 词： | 两参数Davidenkov模型 共（自）振柱试验 剪切模量 阻尼比 |
| 收稿时间： | 2012-02-20 |
Nonlinear characteristics and determinate method of elastic stiffness for soils due to low-amplitude small-strain vibrations |
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| JIA Peng-fei,KONG Ling-wei,WANG Yong,YANG Ai-wu.Nonlinear characteristics and determinate method of elastic stiffness for soils due to low-amplitude small-strain vibrations[J].Rock and Soil Mechanics,2013,34(11):3145-3150. |
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| Authors: | JIA Peng-fei KONG Ling-wei WANG Yong YANG Ai-wu |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China |
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| Abstract: | Railway track and nearby structures in the vicinity of high-speed railway are exposed to low-amplitude small-strain vibrations as high-speed railway traffic construction activities arise. In the finite element (FE) method, how to determine the stiffness tensor E is important to build a rational predicting model to analyze the settlement of track and nearby structures in the vicinity of high-speed railway. Shear modulus G and damping ratio D which will vary with shear strain amplitude are two important stiffness and damping parameters. It is found through resonant column test study that the shear modulus G of soil due to vibrations must be determined by the strain amplitude and the confining pressure, even though under small-strain (shear strain amplitude 10-6
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| Keywords: | two-parameter Davidenkov model resonant/free-vibration column test shear modulus damping ratio |
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