三轴受压聚丙烯纤维珊瑚海水混凝土力学性能及损伤分析

Mechanical properties test and damage analysis of polypropylene fiber coral seawater concrete under triaxial compression

为了研究聚丙烯纤维珊瑚海水混凝土三轴受压时的力学性能,以侧向围压和聚丙烯纤维掺量为变化参数,对36个试件开展了常规的三轴压缩加载试验。通过试验总结了试件的破坏形态,并获取其三轴受压试验过程的应力-应变曲线。基于试验数据,分析了变化参数对聚丙烯纤维珊瑚海水混凝土特征点参数和损伤演化过程的影响规律,提出了侧向围压与聚丙烯纤维珊瑚海水混凝土力学性能指标的关系表达式。试验结果表明:聚丙烯纤维珊瑚海水混凝土的破坏形态随侧向围压的增大逐渐由竖向劈裂转为斜向剪切和横向断裂;三轴受压状态下,掺入适量聚丙烯纤维可有效提高珊瑚海水混凝土的初始弹性模量、峰值应力和峰值应变。

To investigate the mechanical performance of polypropylene fiber coral seawater concrete under triaxial compression,36 specimens were subjected to conventional triaxial compression loading tests with lateral confining pressure value and polypropylene fiber content as changing parameters.The failure modes of the specimens were summarized through experiments,and the stress strain curves of the triaxial compression test were obtained.Based on the experimental data,the influence of changing parameters on the characteristic point parameters and damage evolution process of polypropylene fiber coral seawater concrete was analyzed.The test results show that the failure mode of polypropylene fiber coral seawater concrete gradually changes from vertical splitting to oblique shear and transverse fracture with the increase of lateral confining pressure.In the state of triaxial compression,the initial elastic modulus,peak stress and peak strain of polypropylene fiber reinforced coral seawater concrete can be improved by adding proper amount of polypropylene fiber.