摘要
为研究河冰在复杂应力状态下的力学性质及破坏准则,对淡水柱状冰在恒定轴向加载速率(0.4 mm/min)下,分别进行温度-6、-12、-18和-24°C,围压500、1000和1500 kPa的常规三轴压缩试验。得到天然淡水柱状冰三轴压缩应力应变曲线,三轴压缩广义剪应力峰值与温度及围压的关系,以及三轴压缩能量耗散特征,并利用莫尔库仑准则分析温度和围压对河冰强度参数的影响规律。结果表明:在所选试验条件下,柱状冰主要发生单剪破坏和延性破坏;在恒定温度条件下,广义剪应力峰值随围压的增大呈现近似线性增加;在恒定围压条件下,广义剪应力峰值随温度的升高呈现近似线性减小;根据莫尔库仑理论解释柱状冰破坏准则,在4种试验冰温下,其内摩擦角分别为21°、45°、42°和52°,黏聚力分别为1191.6、513.2、861.6和933.4 kPa;从能量特征角度考虑,柱状冰三轴压缩耗散的能量随着围压的增大有逐渐增加趋势。
In order to study the mechanical properties and failure criteria of river ice under complex stress state,constant axial loading rate（0.4 mm/min） triaxial compression experiments were carried out on colum-nar freshwater ice at four temperatures（-6,-12,-18 and-24 °C） and three confining pressures（500,1000 and 1500 kPa）. The stress-strain curves and the relationship between the peak value of generalizedshear stress with temperature and confining pressure have been obtained. The Mohr Coulomb criterion wasused to analyze the influence of temperature and confining pressure on the intensity parameters of river ice.The results indicate that the failure types of the columnar ice are mainly as shear failure and ductile fail-ure under the selected experimental conditions. The peak value of generalized shear stress increases approxi-mately linearly with the increase of confining pressure at constant temperature,and decreases approximatelylinearly with the increase of temperature at constant confining pressure. To explain the failure criterion ofcolumnar ice by Mohr Coulomb theory under four experimental temperatures,the internal friction angles are21°,45°,42° and 52°,and cohesive strength are 1191.6,513.2,861.6 and 933.4 kPa,respectively. Con-sidering the energy characteristics,the energy dissipated by triaxial compression of the columnar ice increases gradually with the increase of the confining pressure.
作者
韩红卫
解飞
汪恩良
张栋
HAN Hongwei;XIE Fei;WANG Enliang;ZHANG Dong(School of Water Conservancy and Civil Engineering,Northeast Agricultural University,Harbin 150030,China)
出处
《水利学报》
EI
CSCD
北大核心
2018年第10期1199-1206,共8页
Journal of Hydraulic Engineering
基金
黑龙江省应用技术研究与开发计划项目(GZ16B009)
黑龙江省博士后科研启动金(LBH-Q17011)
东北农业大学"青年才俊"项目(17QC11)
关键词
河冰
三轴压缩
强度
破坏准则
river ice
triaxial compression
strength
failure criteria
