论文部分内容阅读
针对地下水对隔水煤柱和矿井地下水库边界的反复浸水损伤过程,研究反复浸水对煤样的力学性质损伤作用,对矿井地下储水和含水层保护等问题有借鉴意义。文中选择15个不同浸水次数的典型煤样进行单轴压缩声发射实验。研究发现,煤样的峰值应力、弹性模量、应变软化模量、后峰值模量均随着煤样浸水次数的增加而呈现不同程度的减小,而峰值应变随着浸水次数的增加而上升。综上反映了水对煤样的明显弱化作用。声发射累计计数、能率均能很好地表示出裂隙发育的各个阶段,对求取弹性模量研究煤样力学性质有重要作用。实验结果对反复浸水作用下煤样的力学性质和裂隙损伤的研究具有借鉴作用。
Aiming at the repeated water damage process of groundwater to the boundary between water-separated coal pillar and mine underground reservoir, the study on the effect of repeated water immersion on the mechanical properties of coal samples is of significance for the underground water storage and aquifer protection in coal mines. In this paper, 15 typical coal samples with different immersion times were selected for uniaxial compression acoustic emission experiments. The results showed that the peak stress, elastic modulus, strain softening modulus and post-peak modulus of coal samples decreased with the increase of coal sample immersion times, while the peak strain increased with the increase of immersion times . In summary, the obvious weakening effect of water on coal samples is reflected. Acoustic emission cumulative count, energy rate can well represent the various stages of fracture development, for the study of elastic modulus to study the mechanical properties of coal samples have an important role. The experimental results can be used as a reference for the study of mechanical properties and fracture damage of coal samples under repeated water immersion.