橡胶砂应力-应变特性三轴-单剪联合试验研究
发布时间：2018-08-01 13:19
【摘要】：橡胶砂作为一种环保的岩土材料有广泛的应用前景。应用三轴和单剪两种试验方法对2种固结压力下、7种配比橡胶砂的应力-应变特性、体变特性和模量衰减特性进行了对比研究,结果表明:随着橡胶颗粒含量的增加,橡胶砂模量降低,应力-应变曲线向应变硬化型转变,线性关系增强;随着橡胶颗粒含量的增加,橡胶砂剪胀特性减弱,剪缩增大;橡胶砂应力-应变关系可用扩展邓肯-张模型进行模拟,模型参数受橡胶颗粒含量影响的规律明显;随着橡胶颗粒含量的增加,橡胶砂的静剪切模量Gs与剪应变γ曲线降低,而橡胶砂模量衰减曲线Gs/G0-γ(G0为初始剪切模量)向大应变方向偏移;三轴和单剪两种试验方法得到的橡胶砂应力-应变特性、体应变-剪应变规律类似,但试验参数明显受应力状态和应力路径的影响,两者的差异主要表现为三轴试验得到的应力-应变曲线和模量曲线高于单剪试验,产生这种差异的主要原因是由于前者的平均应力相对较大。试验还得到了橡胶砂初始模量随橡胶颗粒含量降低的经验关系。
[Abstract]:Rubber sand as a kind of environmental protection geotechnical material has a wide application prospect. The stress-strain characteristics, bulk deformation characteristics and modulus attenuation characteristics of seven kinds of rubber sand under two kinds of consolidation pressures were studied by using triaxial and single-shear test methods. The results show that the content of rubber particles increases with the increase of rubber particle content. The modulus of rubber sand decreases, the stress-strain curve changes to strain-hardening type, and the linear relationship increases, and with the increase of rubber particle content, the dilatancy of rubber sand decreases and the shear shrinkage increases. The stress-strain relationship of rubber sand can be simulated by extended Duncan Chang model. The model parameters are affected by rubber particle content obviously, and the static shear modulus Gs and shear strain 纬 curve of rubber sand decrease with the increase of rubber particle content. However, the modulus attenuation curve of rubber sand G _ s / G _ 0- 纬 (G _ 0 is the initial shear modulus) deviates to the direction of large strain, and the stress-strain characteristics of rubber sand obtained by triaxial and single-shear methods are similar to those obtained by bulk strain-shear strain. But the test parameters are obviously affected by stress state and stress path. The difference between the two is that the stress-strain curve and modulus curve obtained by triaxial test are higher than those in single shear test. The main reason for this difference is that the average stress of the former is relatively large. The experimental results show that the initial modulus of rubber sand decreases with the content of rubber particles.
【作者单位】： 湖南工业大学土木工程学院;
【基金】：国家自然科学基金(No.51108177) 湖南省自然科学基金(No.10JJ4040) 湖南工业大学自科基金项目(No.2012HZX20,No.2013HZX09)~~
【分类号】：TU41
本文编号：2157712
[Abstract]:Rubber sand as a kind of environmental protection geotechnical material has a wide application prospect. The stress-strain characteristics, bulk deformation characteristics and modulus attenuation characteristics of seven kinds of rubber sand under two kinds of consolidation pressures were studied by using triaxial and single-shear test methods. The results show that the content of rubber particles increases with the increase of rubber particle content. The modulus of rubber sand decreases, the stress-strain curve changes to strain-hardening type, and the linear relationship increases, and with the increase of rubber particle content, the dilatancy of rubber sand decreases and the shear shrinkage increases. The stress-strain relationship of rubber sand can be simulated by extended Duncan Chang model. The model parameters are affected by rubber particle content obviously, and the static shear modulus Gs and shear strain 纬 curve of rubber sand decrease with the increase of rubber particle content. However, the modulus attenuation curve of rubber sand G _ s / G _ 0- 纬 (G _ 0 is the initial shear modulus) deviates to the direction of large strain, and the stress-strain characteristics of rubber sand obtained by triaxial and single-shear methods are similar to those obtained by bulk strain-shear strain. But the test parameters are obviously affected by stress state and stress path. The difference between the two is that the stress-strain curve and modulus curve obtained by triaxial test are higher than those in single shear test. The main reason for this difference is that the average stress of the former is relatively large. The experimental results show that the initial modulus of rubber sand decreases with the content of rubber particles.
【作者单位】： 湖南工业大学土木工程学院;
【基金】：国家自然科学基金(No.51108177) 湖南省自然科学基金(No.10JJ4040) 湖南工业大学自科基金项目(No.2012HZX20,No.2013HZX09)~~
【分类号】：TU41
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