加载速率影响的煤体破裂过程声-电荷试验研究

发布时间：2018-04-16 18:26

本文选题：加载速率 + 煤体失稳形式　；参考：《岩土力学》2017年12期

【摘要】：为建立加载速率影响下煤体不同失稳形式的声发射-电荷判据,以阜新五龙矿某工作面为研究对象,采用物理试验研究方法,开展了不同加载速率下煤体破裂过程声-电荷监测试验,深入研究了加载速率影响的煤体力学性质、破裂规律和煤体破裂过程能量耗散与声发射-电荷信号的对应关系。研究结果表明:加载速率越高,应力调整越提前,煤样单轴抗压强度增加,累积变形能耗散加剧,煤体失稳形式由静载失稳过渡到类动载扰动失稳,煤体失稳破坏的动力特征明显,压缩型冲击地压动力灾害发生几率增大;不同加载速率下煤岩破裂过程产生的声-电荷信号变化与煤岩受载的应力突变具有较好的一致性;对所用煤样的声发射-电荷信号进行量化分析,初步提出了判定煤体失稳形式的声-电荷复合判定依据,在不同矿区、不同工作面上,可依据监测获得的声-电荷现场数据辅以采动应力场的变化情况,对采动过速诱发的煤体压缩型冲击地压的发生几率进行预测和预警。
[Abstract]:In order to establish the acousto-charge criterion of different instability forms of coal under the influence of loading rate, a working face of Wulong Mine in Fuxin was studied, and the physical test method was adopted.The acousto-charge monitoring tests of coal body rupture process at different loading rates were carried out. The mechanical properties of coal body, the fracture law and the relationship between the energy dissipation during coal mass rupture process and acoustic emission-charge signal were studied in depth.The results show that the higher the loading rate, the earlier the stress adjustment, the higher the uniaxial compressive strength of the coal sample, the greater the energy dissipation of cumulative deformation, and the transition from static load instability to dynamic disturbance instability.The dynamic characteristics of coal body failure are obvious, the probability of compression type rock burst dynamic disaster is increased, and the acoustic-charge signal changes in the process of coal rock fracture under different loading rates are in good agreement with the stress abrupt change of coal and rock load.The acoustic emission-charge signal of the coal sample is quantitatively analyzed, and the basis of the acoustic-charge compound judgement for judging the instability of coal body is put forward preliminarily. In different mining areas and different working faces,According to the acoustic-charge field data obtained by monitoring and the variation of mining stress field, the probability of coal compression type rock burst induced by mining overspeed can be predicted and forecasted.
【作者单位】：辽宁工程技术大学力学与工程学院;重庆大学煤矿灾害动力学与控制国家重点试验室;辽宁大学物理学院;
【基金】：国家自然科学基金面上项目(No.51374123,No.51774164);国家自然科学基金青年项目(No.51504029,No.51504122) 煤矿灾害动力学与控制国家重点试验室自主研究资助项目(No.2011DA105287-FW 201605)~~
【分类号】：TD315

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