尺寸效应对生土立方体试件抗压强度的影响

试件的抗压强度是生土基建筑材料的重要力学指标.本次研究以生土材料立方体试件尺寸效应为研究目的,探寻不同尺寸试件对材料抗压强度的影响.对采用同样制样方法、养护方式和加载方法的三种尺寸立方体生土试件进行抗压强度试验,研究试件的破坏形态、抗压强度以及试件的不同尺寸对强度的影响规律与作用机理,并采用统计筛选法推算三种尺寸试件的强度关系系数.结果表明,小尺寸试件破坏过程显著.材料抗压强度随试件尺寸的增大而减少,呈现出线性关系.100 mm试件与150 mm试件的强度换算系数为0.67,100 mm试件与200 mm试件的强度换算系数为0.42.生土基材料试件抗压强度受尺寸效应影响显著.

Effect of different specimen size on raw soil materials

The compressive strength of parts is an important mechanical indicator of raw soil-based building materials. For the purpose of studying the size effect of cube specimens of raw soil materials, this research explores the influence of different sizes of specimens on compressive strength of the materials. Compressive strength tests of three kinds of cube raw soil specimens with the same sample preparation method, maintenance method and loading method were carried out to investigate failure pattern and compressive strength of the specimens. The regularity and mechanism of effect of different specimen sizes on the strength are investigated, and the strength relation coefficients of the three sizes of specimens are calculated hence by statistical screening method. Results from our researches indicate that the failure process of specimens with small size is obvious. The compressive strength of the material decreases with increase of specimen size, exhibiting a linear relationship. The strength conversion coefficient between 100 mm specimen and 150 mm specimen is 0.67, and that between 100 mm specimen and 200 mm specimen is 0.42. The compressive strength of raw soil-based materials is significantly affected by size effect.