矸石充填材料应力应变特征实验研究

为掌握矸石充填材料应力应变特征，选取云冈煤矿3组粒径80 mm以下原生矸石试样，同时设计6组不同粒径级配的矸石试样，加工大直径加载容器，采用TAW-3000型电液伺服控制材料试验系统进行了压缩实验。结果表明：矸石压缩过程可分为应变快速增长、非线性增长和缓慢增长3个阶段；应变主要由矸石块体的移动、破碎而导致块体之间空隙被填充引起，而并非矸石本身变形所致；相同轴向应力下，应变随试样中的小粒径矸石占比增加而减小，随大粒径矸石占比增加逐渐增大；原生组矸石试样应变处于设计级配组的中间范围。实验得到矸石试样应变与小粒径矸石占比的关系式，可为矸石充填开采设计研究提供参考。

Experiental Study on Stress and Strain Characteristic of Gangue Filling Material

In order to master the stress and strain characteristics of gangue filling materials, three groups of primary gangue samples with particle size below 80 mm in Yungang Coal Mine were selected, and six groups of gangue samples with different particle size grading were designed. The large diameter loading container was processed, meanwhile, the compression experiment was carried out by using TAW-3000 electro-hydraulic servo control system. The results show that the compression process of gangue can be divided into three stages: rapid growth, nonlinear growth and slow growth; the strain is mainly caused by the movement and breakage of rock blocks, which leads to the filling of the space between the blocks, but not the deformation of the gangue itself; under the same axial stress, the strain decreases with the increase of the proportion of small particle size in the sample, and increases with the increase of the proportion of large particle size gangues; the strain of primary gangue samples is in the middle range of the designed grading groups. The relationship between the strain of gangue samples and the proportion of gangues with small particle size is obtained, which can provide reference for the design and research of filling and mining of gangue.