分层尾砂胶结充填体单轴抗压强度的测试研究

采用高阶段空场嗣后胶结充填法的矿山,充填设计常采用不同配比的尾砂胶结充填体进行分层充填。通过室内试验,对灰砂比为16、18的尾砂胶结充填体进行分次充填并测试其单轴强度;对配比一定、浓度不变时的充填体的单轴强度实测值进行拟合,得出了充填体分层数与其单轴抗压强度的非线性回归方程,并剖析了分层充填体破坏时产生端部效应的机理。采用RFPA软件模拟了某铁矿分层充填体的破坏过程,数值模拟结果与试验结果相符,验证了分层充填体端部效应破坏理论的正确性。

Study on uniaxial compressive strength of stratified cemented tailings backfill

The mines that use high stage delayed backfill method,usually design cemented tailings backfill with different ratio of filling to achieve Stratified filling.Exper iments on the cement-tailing ratio of 1:6, 1:8 for the cemented tailings backfill were grsded filled and then test their uniaxial strength; this paper made uniaxial strength of filling body fitting measured value T when proportion and concentration is constant, the nonlinear number and uniaxial compressive strength of filling body of hierarchical regression equation ,and analyse the generation mechanism of the end effect of stratified filling body when it damages. This paper simulates the damage process stratified backfill in a iron ore by using RFPA software, The results of the numerical simulation and experiment are consistent.it verifies the correctness of the end effect theory.