胶凝砂砾石料动力特性试验  

Dynamic characteristic test on cemented sand and gravel material

作　　者：明宇[1,2] 蔡新[1,3] 郭兴文[3] 傅华[4] 

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]青岛市市政工程设计研究院,山东青岛266101 [3]河海大学力学与材料学院,江苏南京210098 [4]南京水利科学研究院岩土工程研究所,江苏南京210029

出　　处：《水利水电科技进展》2014年第1期49-52,共4页Advances in Science and Technology of Water Resources

基　　金：高等学校博士学科点专项(20100094110014);国家自然科学基金(51179061);"十二五"国家科技支撑计划(2012BAD10B02)

摘　　要：为研究胶凝砂砾石料的动力特性,采用大型动力三轴试验仪进行胶凝掺量为60 kg/m3的胶凝砂砾石料的动力试验,分析了材料最大动弹性模量与围压之间的关系,推导了非线性动弹性模量及阻尼比的表达式。试验结果表明:胶凝砂砾石料的动应力动应变关系具有明显的非线性特征,且受围压的影响较大;材料动弹性模量随动应变的增大而减小,而阻尼比则相应增大,并趋于某最大值;动应变一定时,围压增大引起材料动弹性模量增大,而阻尼比则随之减小。In order to study the dynamic characteristics of cemented sand and gravel material, dynamic triaxial tests on cemented sand and gravel material with gel content of 60 kg/m3 were performed by the large-scale dynamic triaxial apparatus, the relationship between the maximum dynamic elastic modulus of the material and confining pressure was derived, and the expressions for the nonlinear dynamic elastic modulus and damping ratio were established. Test results show that the dynamic stress-strain relationship of the cemented sand and gravel material is obviously nonlinear, and is significantly influenced by the confining pressure. The dynamic elastic modulus of the material decreases with the increase of the dynamic strain, while the damping ratio increases with the dynamic strain and tends to a constant. As the dynamic strain is constant, the dynamic elastic modulus increases and the damping ratio decreases with the increase of the confining pressure.

关 键 词：胶凝砂砾石料 动力三轴试验 动弹性模量 阻尼比 

分 类 号：TV41[水利工程—水工结构工程]