Experimental study on the compaction of saturated broken rock of continuous gradation

In order to study the compaction characteristics and particles size distribution of saturated broken rock of continuous gradation,an experimental study was conducted on saturated broken rock which satisfies the Talbol distri- bution by using self-made equipment and MTS816. 03 rock mechanics test system. The influences of n on the secant modulus,the tangent modulus,the porosity,the bulking factor and the compactness were analyzed. The variation laws of distribution coefficient r with Talbol index and axial stress were investigated. The stress-strain relationship of broken rocks was established,which can reflect the variation of particle size distribution. The results show that the secant mod- ulus,the tangent modulus,the porosity,the bulking factor and the compactness of rock samples were negatively related with the Talbol index n in the bearing process of broken rock samples. The distribution coefficient r decreased when axial stress increased. And the distribution coefficient r tended to increase with n,when the axial stress was less than 50% of the uniaxial compressive strength. When the axial stress was more than 50% of the uniaxial compressive strength,the relationship between distribution coefficient r of broken rock samples and n fluctuated. The distribution coefficient r of different n tended to be uniform with the axial stress exceeded 90% of the uniaxial compressive strength.