DOI: 10.11799/ce202508020
Mechanical properties and energy evolution law of variably-sized backfill bodies
ZHAO Mengye
ZHU Lei
LIU Chengyong
GU Wenzhe
LIU Zhicheng
HE Zhiwei
DING Ziwei
QIU Huafu
LI Yuhang
Abstract：Based on three kinds of fly ash content(15%,20%,25%)and three kinds of cement content(6%,8%,10%),cubic specimens with side lengths of 40,50,70.7 and 100 mm were prepared to investigate the effect of size on the damage characteristics and energy evolution of the backfill bodies.The results show that when the size of the backfill body is certain,the strength of the backfill body with 20%fly ash content and 10%cement content is the highest,and the compressive strength of the backfill body shows the law of"increasing first and then decreasing"with the increase of the size,and it reaches the peak value of 19.85 MPa when the size is 70.7 mm.The elastic modulus of the backfill body is positively correlated with the size,and with the increase of the specimen size,the damage form changes from tensile damage to X-type shear damage.The energy characteristics of backfill bodies of different sizes under uniaxial compression are similar,the elastic energy dominates before reaching the maximum stress,and the dissipated energy rises after reaching the maximum stress,and with the increase of size,the energy storage limit and bearing capacity of the backfill body show the trend of increasing and then decreasing,and the curve of elastic-energy consumption ratio changes from stable to rising,which can be used as a basis for the destruction of the backfill body.
Keywords：gangue cemented backfill bodyuniaxial compressionfailure characteristicsmaterial ratioenergy evolution
Publication Date：2025-08-20
Online Publishing Date：2025-09-10(First online date of this platform, not the publication date of the document)
Pages：7( 146-152 )