珊瑚海水混凝土三轴受压力学性能试验研究

Investigation on mechanical properties of coral seawater concrete in triaxial compression

为研究珊瑚海水混凝土的三轴受压力学性能,对24个试件进行常规三轴试验。试验观察了试件的破坏形态,获取其受力破坏全过程的应力-应变曲线。结果表明:随着围压值增大,其破坏形态由竖向劈裂转为斜向剪切和横向断裂;应力-应变曲线上升段斜率增大、峰值点提高、峰点后下降段平缓,其相应峰值应力、峰值应变、弹性模量、耗能均增大,而延性系数则先增后降且最终稳定;侧向围压能延缓初始损伤出现,降低损伤发展速率和程度。

In order to study the triaxial compressive mechanical properties of coral seawater concrete,24 specimens were fabricated for conventional triaxial tests.The damage morphology of the specimens and obtained their stress-strain full process curves were observed.The results showed that the damage pattern changed from vertical splitting to oblique shear and transverse fracture with the increase of the circumferential pressure.The slope of the rising section of the stress-strain curve increased,the peak point increased and the falling section after the peak point leveled off.The peak stress,peak strain,elastic modulus and energy dissipation increased,while the ductility coefficient increased and then decreased and finally stabilized.The lateral circumferential pressure could delay the appearance of the initial damage and reduce the rate and degree of damage development.