Ảnh hưởng của kích thước mẫu thí nghiệm đến cường độ chịu cắt thu được từ thí nghiệm cắt trực tiếp trên đất sét cao lanh đầm chặt

The primary objective of this study is to investigate the effect of sample size on the shear strength behavior of compacted kaolin. To achieve this, a series of direct shear tests were conducted on saturated kaolin samples with dimensions of 10 × 10 × 2 cm and 6 × 6 × 2 cm, subjected to three net normal stress levels: 50, 100, and 200 kPa. The test results show that, for a given net normal stress, the larger samples consistently exhibit higher shear strength compared to the smaller ones. Notably, the cohesion value derived from the larger samples is substantially greater, while the corresponding internal friction angle is lower than those obtained from the smaller samples.