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| 围岩与早期强度阶段充填体耦合作用的模拟试验研究 |
| Simulation experiment of coupling effect between surrounding rock and filling body in early strength stage |
| 投稿时间：2018-06-29 |
| DOI： |
| 中文关键词: 围岩 充填体 早期强度 石蜡 耦合作用 裂纹扩展 超声波检测 声发射 |
| 英文关键词: surrounding rock filling body early strength paraffin coupling effect crack propagation ultrasonic testing acoustic emission |
| 基金项目:国家自然科学基金资助项目(51604195). |
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| 中文摘要: |
| 选用全精炼工业石蜡和以石蜡为胶结剂的尾砂石蜡拌合料作为两种充填体模拟材料,通过轴向加载测试并借助超声波检测仪、声发射信号分析仪、裂纹扩展显微成像设备等,对处于早期强度阶段的充填体与围岩的耦合作用机理进行试验研究。结果表明,石蜡和尾砂石蜡这两种材料的力学变形特征与矿山所用充填体早龄期的力学性能相似,用其模拟处于早期强度阶段的胶结充填体是合理和可行的；在加载过程中,围岩/充填体复合试样的破坏裂纹主要沿着围岩与充填体接触面扩展；试样内超声波声速值衰减幅度越大的区域,其内部损伤破坏越严重；试样加载过程中的声发射点分布情况进一步验证了损伤破坏在充填体与围岩接触带区域发生较多,这与裂纹扩展情况相符。 |
| 英文摘要: |
| Fully-refined industrial paraffin and the mixture of tailings with paraffin as cementing agent were chosen as two kinds of similar materials of filling body. The axial loading tester, ultrasonic detector, acoustic emission signal analyzer and micro-imaging equipments for crack propagation were used to study the coupling mechanism between filling body in the early strength stage and surrounding rock. The experimental results show that pure paraffin and the mixture of tailings and paraffin have mechanic deformation characteristics similar to those of the mine-used early-age filling body, and it is reasonable and feasible to use them to simulate the cemented filling body in the early strength stage. In the process of loading, damage cracks in the composite samples mainly extend along the interfaces of surrounding rock and filling body. The larger attenuation amplitude of ultrasonic velocity in the samples, the more serious internal damage in the relevant regions. In addition, the distribution of acoustic emission points in the samples during loading also demonstrates that the damages occur more frequently in the contact zone between filling body and surrounding rock, which is consistent with the crack propagation. |
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