不同含水率高固水充填材料压缩变形特性研究

Study on compressive deformation characteristics of high solid water filling materials with different moisture content

为揭示高固水充填材料压缩变形特性,制备61%、65%、69%3种含水率的充填材料,通过室内试验分析其基本性能,并利用单轴承载试验研究材料抗压稳定性及变形特性.结果表明:高固水充填材料早期强度较高,混合材料凝结时间在30 min左右满足充填要求,材料流动度较好满足运输要求;单轴压缩条件下材料应力应变曲线宏观上有4个阶段:压密阶段、线弹性阶段、屈服阶段、峰后残余变形阶段;材料的弹性模量和割线模量随材料含水率的增加而明显减小,割线模量线性下降趋势比弹性模量变化特征较缓;随着高固水充填材料含水率增高其黏聚力损失较小,材料整体性越好,延性变形特征明显.

In order to reveal the compression and deformation characteristics of high water content filling materials,the filling material with 61%,65%and 69%water content was prepared.The basic properties were analyzed through laboratory tests,and the compressive stability and deformation characteristics of the materials were studied by uniaxial bearing tests.The results show that the early strength of high water content filling materials was high,filling requirements were met when setting time lasts 30 minutes,and the material fluidity was better to meet the transportation requirements.Under uniaxial compression,the material stress-strain curve has four stages:compaction stage,linear elasticity stage,yield stage and post-peak residual deformation stage.With the increase of the water content,the elastic modules and secant modulus of the material decrease obviously,and the linear decreasing trend of secant modulus is slower than the elastic modulus.With the increase of water content of high water content filling materials,the loss of cohesive force is small,the material integrity is better,and the characteristics of the ductility deformationare clear.