School of Safety Engineering, China University of Mining and Technology MOE Key Lab of Mine Gas and Fire
Disaster Prevention and Control, China University of Mining and Technology

为得到水对煤样力学性质及声电特征的影响规律,对干燥煤样和饱和煤样进行了拉伸试验,比较分析了拉伸过程中干燥、饱和煤样的应力-应变和声电信号的变化差异。研究表明:拉伸过程中,煤样经历了应变线性增长、塑性增长和拉伸破裂3个阶段,电磁辐射及声发射信号与煤样变形破裂基本同步对应,加载初期,声电信号较小,当发生塑性变形或破裂变形时,声电信号迅速增长至峰值;水使煤样的抗拉强度降低31.5%,使拉应变增长101.1%,即水对煤样具有降低强度、增加塑性,使声电信号衰减的作用。监测分析表明煤样声电信号的变化幅度可评价水对煤样的影响程度。

In order to obtain water affected to the mechanics features and acoustic- electricity features of the coal sample, a tensile experiment was conducted on t he dry coal sample and saturated coal sample. The variation differences between the stress strain and acoustic- electric signal of the dry and saturated coal samples du ring the tensile process were compared and analyzed. The study showed that during the tensile process, the coal sample had experienced a stress liner increasing, pla stic increasing and tensile fracturing stages and the electromagnetic radiation and acoustic emission signal were basic synchronous correspondence to the deformation fracturing of the coal sample .At the initial loading period, the acoustic and electric signal was low and when a plastic deformation or a fracturing deformation occurred, t he acoustic- eclectic signal was rapidly increased to the peak. Water could make the tensile strength of the coal sample reduced by 31 .5% and could make the tensile s tress increased by 101. 1%. Water could reduce the strength and increase the plasticity of coal sample to make the acoustic- electric signal attenuation. The monitorin g, measurement and analysis on acoustic- electric signal variation amplitude of the coal sample could evaluate the influence degree of mechanical property and acousti C- electricity characteristics of water to coal sample.

国家自然科学基金资助项目(51104156)；中央高校基本科研业务费专项资金资助项目(2010QNB01)；