摘要
为了研究堆石料的模量阻尼特性,采用大连理工大学研制的微机控制电液伺服式粗粒土静动力剪切仪,对古水水电站灰岩堆石料进行模量阻尼试验研究,研究了不同围压、不同剪应变对堆石料模量阻尼特性的影响。试验结果表明,在剪应变增加的情况下,堆石料的动力剪切模量会减小,阻尼比随剪应变变化的规律则与之相反;围压的增加引起堆石料的最大动剪切模量的增加;围压的增大会引起动力剪切模量随之而增大,而阻尼比则随之减小;堆石料的动力应变关系可以用等效线性模型描述。
Dynamic shear tests on rock fill materials of Gushui Hydropower Station were performed to study their characteristics of modulus damping. The computer-controlled electro-hydraulic servo static and dynamic shear instrument developed by the staff of Dalian University of Technology was adopted to conduct the modulus damping experiments of the limestone rock fill in Gushui Hydropower Station. The impact of different confining pressure and shear strain on the modulus damping characteristics of the rock fill were studied. The experimental results indicate that the dynamic shear modulus of rock fill material decreases with the increasing of the shear strain,while the damping of rock fill material increases with the shear strain. As the confining pressure increases,values of maximum dynamic shear modulus grow while the damping modulus decreases. The dynamic stress-strain relationship can be described by the nonlinear viscoelastic dynamic constitutive models.
出处
《水利与建筑工程学报》
2015年第2期173-176,共4页
Journal of Water Resources and Architectural Engineering
关键词
动力剪切仪
堆石料
动剪切模量
阻尼比
static and dynamic shear instrument
rock fill materials
dynamic shear modulus
damping ratio
