真三轴条件下高强度石膏强度与变形特征研究

Research on the Strength and Deformation Characteristics of High-Strength Gypsum Material in True Tri-Axial Experiments

应用真三轴试验装置对高强度石膏材料的强度变形特征进行深入研究。研究结果表明:σ_3、σ_1-ε_1相同的曲线,初始切线模量和破坏强度随σ_2的增大而增大,软化程度随σ_2的增大而减弱;σ_2相同的曲线,Mb随σ_3的增加而逐渐降低,且其变化量随着σ_2的增大而减小。Tresca屈服准则和Mogi破坏准则更适合于高强度石膏材料。

Further research for the strength and deformation characteristics of the high-strength gypsum material is carried out by true tri-axial apparatus. The results show that for the same curves as σ3、σ1-ε1,both the initial tangent modulus and the failure strength have positive correlation with σ2,and the softing type becomes lower due to the increased σ2. For the same σ2,the correlation between Mband σ3 is opposite; and Mbvariation decreases with the increase of σ2. And the Tresca yield criterion and Mogi failure criterion are more suitable for high-strength gypsum material.