| 秦超,牛雷雷,朱万成*,张乃源.不同龄期砂浆全长黏结锚杆中应力波传播的试验研究[J].实验力学,2021,36(6):725~734 |
| 不同龄期砂浆全长黏结锚杆中应力波传播的试验研究 |
| Experimental study on stress wave propagation in the full grouted rock bolts with mortar at different ages |
| 投稿时间：2020-11-23 修订日期：2021-01-21 |
| DOI：10.7520/1001-4888-20-231 |
| 中文关键词: 全长黏结锚杆 养护龄期 应力波 含缺陷锚固锚杆 |
| 英文关键词:full grouted rock bolts curing age stress wave anchoring defects |
| 基金项目:国家自然科学基金（51525402、51904056）资助 |
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| 中文摘要: |
| 利用激振锤冲击锚杆激发应力波，研究不同龄期砂浆全长黏结锚杆中的应力波传播规律。基于应力波在全长锚固锚杆中的传播试验，测得速度和幅值随着锚固剂养护龄期增长而衰减，养护龄期14d内，波速和幅值衰减程度急剧下降，在3d时达到最大，14d后波速和幅值衰减程度维持稳定。由不同龄期条件下的应力波频谱分析可知，随着养护龄期的增长，同一波形中能量占比的变化趋势保持不变，但是高频谐波所占能量的比例增大；能量占比曲线交叉点向低频移动，总能量衰减趋于稳定。在拉拔过程中，随着拉拔力的增大，锚固系统中应力波波速略有上升，应力波幅值衰减程度减小，各谐波幅值差异值也随之减小。基于应力波在含缺陷锚固锚杆中传播的试验，发现应力波波速和幅值的衰减幅度可以用于评价锚固效果，进而用于评估锚固施工质量。 |
| 英文摘要: |
| The stress wave propagation in the full grouted rock bolts with mortar was investigated, where the mortar is subjected to different ages and stress wave induced by a shock excitation hammer impacting the bolt. It is found that both velocity and amplitude decrease with the increment of curing age of the anchor agent, based on the experiment of stress wave propagation in the full grouted rock bolts. Velocity and amplitude attenuation drastically decrease within the first 14 curing ages and maintain steadily thereafter. The energy proportion manifests no change in the same waveform with the increment of curing ages, but the proportion taken by high-frequency harmonic increases. The crossing point of energy proportion curves moves towards low frequency area, whereas the decrement of total energy tends to be stable.During the pulling process, as the pulling force increases, the stress wave velocity in the anchoring system increases slightly, the attenuation of the stress wave amplitude decreases, and the difference forthe amplitude of each harmonic wave also decreases. The construction quality of anchoring can be evaluated by the anchoring effect of anchoring agent, which can be estimated by the attenuation amplitude of stress wave velocity and amplitude, based on the experiment of stress wave propagation in defective anchored bolt. |
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