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本文利用自制的三轴试验系统对2个大型水电站大坝混凝土及一般配比的混凝土在三轴加载下的强度和变形特性进行了试验研究,特别对国内外较少进行的变形特性给予了重点分析。应力组合除三向受压外还包含了国内外较少进行的对强度起控制作用的二压一拉状态,给出了在各种应力组合下混凝土的变形和强度特性;分析了中间应力对强度的影响;并建议了一个用八面体应力表达的混凝土强度准则。该准则的特点是包含了三轴拉压应力状态,并把真三轴、常规三轴、平面应力和平面应变等多种应力状态统一地用相对简单的线性方程表示,便于工程设计的应用。
In this paper, the self-made triaxial test system was used to test the strength and deformation characteristics of the concrete of the two large-scale hydropower station dams and the general ratio of concrete under triaxial loading, and the focus was given to the deformation characteristics that are rarely performed at home and abroad. analysis. In addition to three-way compression, the stress combination also includes the two-pressure and one-pull state that exerts little control over the strength at home and abroad, and gives the deformation and strength characteristics of the concrete under various stress combinations; the intermediate stress pair is analyzed. The effect of strength; and a concrete strength criterion expressed in octahedral stress. This criterion is characterized by the inclusion of triaxial tensile-compressive stress states, and the fact that true triaxial, conventional triaxial, plane stress, and plane strain, and other stress states are uniformly represented by relatively simple linear equations, facilitating the application of engineering design.