珊瑚礁砂混凝土双轴受压强度试验与应力空间破坏准则

Failure Criterion in Stress Space for Coral Reef Sand Concrete Under Biaxial Compression

设计了海水拌制的珊瑚礁砂混凝土立方体试件双轴受压力学试验,总结了珊瑚礁砂混凝土破坏形态、抗压强度、破坏准则。结果表明,珊瑚礁砂混凝土试件随着应力比的变化而表现出不同的破坏特征;当双轴加载应力比为α=0.5时混凝土抗压强度最大;当应力比为α=0.25时,主压应变最大;最后建立了双轴受压珊瑚礁砂混凝土的主应力破坏准则。

Mechanical experiments on coral reef sand concrete cube specimen under biaxial compression were designed and implemented with a three-aixal testing instrument.Ratio of the second principal stress to the third principal stress was fixed after specimens were pre-loaded.Failure patterns were observed and recorded,and stress-strain data were logged automatically during the whole process of compressing.Compressive strength was presented.The experimental results show coral reef sand concrete specimens exhibit different failure characteristics due to the various stress ratio.When biaxial loading stress ratioαkeeps at 0.5,the compressive strength reaches the highest,while the third principal strain reaches maximum when stress ratioαis about 0.25.Finally,failure criterion in stress space for biaxial compression coral reef sand concrete is suggested based on the envelop curve of all test results.