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针对花岗岩残积土原状样、重塑样和剔除粒径大于5mm颗粒的重塑样,分别进行小型、中型和大型3种不同直径试样的三轴固结不排水剪切试验,研究了不同试样尺寸下花岗岩残积土的应力-应变特性,探讨了颗粒大小和试样尺寸对花岗岩残积土应力-应变特性及抗剪强度的影响。研究表明:不同尺寸大小的试样所测定的应力-应变关系相似,但量值大小有差异;存在超粒径颗粒会造成土样的有效粘聚力偏高,有效内摩擦角偏低;当不存在超粒径颗粒时,随着试样尺寸的增加,土样的有效粘聚力增大、有效内摩擦角减小,且其变化趋势具有线性规律,总粘聚力减小、总内摩擦角增大;总体来说,粘聚力变化较大,内摩擦角变化较小。
According to the original granite remnant samples, the remodeling samples and remodeling samples with particle sizes larger than 5 mm, the triaxial consolidation undrained shear tests of three kinds of small, medium and large diameter samples were carried out respectively. Stress-strain characteristics of granite remnant soils, the effect of particle size and sample size on the stress-strain properties and shear strength of granite remnant soils was discussed. The results show that the stress-strain relations of the samples with different sizes are similar, but the magnitude of the values are different. The existence of oversized particles can cause the effective cohesion of the soil sample to be high and the effective internal friction angle to be low. In the absence of superfine particles, as the sample size increases, the effective cohesion of soil samples increases, the effective internal friction angle decreases, and the change trend has a linear rule, the total cohesion decreases, the total internal The friction angle increases; on the whole, the cohesion force changes greatly and the internal friction angle changes little.