Experimental Study of Rockfill Particle Breakage

Abstract

As the high concrete faced rockfill dams construction, grain breakage gradually become the factors that influence the high dam construction which can not be ignored. This text based on the master of rockfill of shuibuya dam as the experimental material, getting and analyzing the particle breakage data under different confining pressure through the large-scale triaxial test, and the results show that the particle breakage index increases with the increase of confining pressures. The relationship between particle breakage index and confining pressure can be expressed by formula;Particle breakage increase leading to reduced internal friction angle and the shear strength of rockfill, and the author newly introduced two broken variable to describe the relationship which can be expressed by the formula between the particle breakage and internal friction angle, it has certain reference value for establishing constitutive model considering particle breakage.

A rockfill particle breakage evolution model for predicting gradation changes

“…Ye [12] carried out a series of shock loading tests with different influencing factors (initial gradation, water content, compaction coefficient)，found that regardless of the initial gradation and moisture content, under shock loading, the degree of particle breakage increases with the compaction coefficient. Xu [13] conducted large-scale triaxial tests with Shuibuya rockfill as the test material, and found that the particle breakage index increased with the increase of confining pressure. Sun [14] carried out a consolidated drainage triaxial test with a maximum deformation of 25% for the rockfill material of the high-face concrete rockfill dam Shuibuya Dam, and found that the rockfill material will undergo obvious particle breakage under the action of high pressure.…”