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本文利用自制的混凝土三轴试验系统,对国内尚未研究的轻骨料混凝土在常规三轴及真三轴受压状态下的强度特性进行了试验研究;分析了中间应力对强度的影响;在与普通混凝土三轴受压状态下的特性进行比较中,发现它与普通混凝土的显著差别除极限强度低外,在三向高压应力比下具有明显的平台流塑特性。据此,提出轻骨料混凝土在八面体应力空间下表述的强度准则。该准则的特点是考虑了平台流塑应力的影响;考虑了罗德角影响的偏平面上的强度包络线方程,形式简单,且能充分满足边界条件,与试验结果符合较好。本文的工作为充分利用轻骨料混凝土在三轴应力状态下的强度,提供了试验及理论依据。
In this paper, a self-made concrete triaxial test system is used to study the strength characteristics of light-weight aggregate concrete that has not been studied in the conventional triaxial and true triaxial compression states; the influence of intermediate stress on the strength is analyzed; When comparing the characteristics of ordinary concrete in the triaxial compression state, it is found that the significant difference between it and the ordinary concrete, except for the low ultimate strength, has obvious platform flow-plastic characteristics under the three-direction high-pressure stress ratio. Based on this, the strength criterion of lightweight aggregate concrete expressed in the octahedral stress space is proposed. This criterion is characterized by considering the influence of the platform's flow plasticity stress; taking into account the influence of the Rode angle on the deflection plane of the strength envelope equation, the form is simple, and can fully meet the boundary conditions, and the test results are in good agreement. The work of this paper provides experimental and theoretical basis for making full use of the strength of light aggregate concrete in triaxial stress state.