Energy consumption and damage characteristics of stratified backfill under triaxial loading and unloading
SONG Weidong
WANG Jie
TAN Yuye
CAO Shuai
Abstract：To explore the intrinsic relationship among the energy dissipation mechanism,the damage characteristics and the layered structure,triaxial cyclic loading and unloading tests were carried out using TAW-2000 test system on different layered cemented backfill with filling times of 1,2,3 and 4 respectively.The results show that the dissipation energy,the elastic energy and the total energy absorbed of the backfill satisfy the linear relationship with the filling times.Most of the energy absorbed by the backfill is dissipated (about 85％) and only a small fraction (about 15％) is used to generate the elastic energy.The calculation formula of the three-dimensional damage value D of the backfill is deduced.D follows an exponential increment with the increase of the axial pressure,a polynomial increment with the increase of the filling times,and an exponential decrease with the increase of the confining pressure.Compared with the filling times,D is more sensitive to the confining pressure.The regression equation of the damage value D and the axial pressure,confining pressure and filling times is established by Excel.
Keywords：stratified backfillcyclic loadingenergy dissipationdamage characteristicsdamage value Dregression analysis
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1050-1057 )