Analysis of stability and mechanical strength characteristics of waste rock-ungraded tailings slurry
To determine the stability and hardening strength characteristics of waste rock-ungraded tailings slurry in a gold mine,tests were conducted on the slurry's bleeding rate,stratification degree,and hardening strength.The stability of the filling slurry was evaluated using the bleeding rate and stratification degree as indicators.An in-depth analysis was performed on the uniaxial stress-strain curve,failure behavior,factors influencing the strength,and the evolution of the filling body's strength.Based on the test data,a regression model for the strength of the filling body was established and verified through supplementary tests.The test results showed that when the concentration is below 68％,the proportion of waste rock has a dominant effect on the stratification degree.When the concentration exceeds 68％,the influence of waste rock addition on slurry segregation decreases,while changes in the cement-sand ratio lead to reduced anti-segregation performance.Under conditions of a high cement-sand ratio,increasing the proportion of waste rock reduces the elastic strain value,whereas the plasticity of the filling body decreases as the waste rock proportion increases.The main strength increase of the filling body occurs within the first 0-7 d of curing,after which the rate of strength growth gradually slows.Factors influencing the rate of strength growth are cement-sand ratio＞slurry concentration.The established regression model for predicting the filling slurry mix parameters shows an error margin within±15％,making the model reliable for providing a reference for future mix optimization.
万方数据
维普
