| 基于岩石表面位移场的超声波振动下花岗岩损伤特性试验研究 |
| 投稿时间：2020-10-30 修订日期：2021-02-24 点此下载全文 |
| 引用本文：张程,赵大军,张书磊,等.基于岩石表面位移场的超声波振动下花岗岩损伤特性试验研究[J].钻探工程,2021,48(3):39-45.ZHANG Cheng,ZHAO Dajun,ZHANG Shulei,et al. Experimental study on damage characteristics of granite under ultrasonic vibration based on the displacement field of the rock surface[J]. Drilling Engineering, 2021,48(3):39-45. |
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| 基金项目:国家自然科学基金项目“超声波振动碎岩机理的研究”（编号：41572356） |
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| 中文摘要:超声波振动碎岩技术作为解决硬岩钻进难题的新方法，其技术可行性受到国内外学者的大量验证，但是对于超声波振动下硬岩破碎机理的认识还存在不足。超声波振动下岩石表面径向响应位移与内部损伤状态存在着必然的联系，本文通过监测岩石在超声波振动过程中表面不同深度处的径向响应位移，利用应力波传播理论从能量耗散角度分析了岩石表面不同深度监测点径向响应位移的时空演化与岩石内部损伤发展的关系，得出超声波振动下岩石损伤主要由振动头高频冲击岩石造成的Hertz锥形环状裂纹和超声波振动交变应力产生的疲劳拉伸裂纹造成的，Hertz锥形环状裂纹的扩展深度为10 mm，疲劳损伤裂纹主要在10~20 mm深度处产生，超声波振动下岩石发生局部宏观破碎前存在着明显的径向响应位移征兆，岩石表面径向响应位移可以作为超声波振动下的破坏判据。本文的研究对于丰富超声波振动下硬岩的破碎机理具有重要意义。 |
| 中文关键词:超声波振动 振动碎岩 花岗岩 径向响应位移 损伤破碎规律 |
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| Experimental study on damage characteristics of granite under ultrasonic vibration based on the displacement field of the rock surface |
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| Abstract:Ultrasonic vibration rock fragmentation technology is a new method to solve hard rock drilling problems. Its technical feasibility has been verified by a large number of scholars at home and abroad. However， there is still insufficient understanding of the hard rock fragmentation mechanism under ultrasonic vibration. There is an inevitable connection between the surface radial response displacement of rock and its internal damage state under ultrasonic vibration. In this paper， by monitoring the radial response displacement of rock surface at different depths during ultrasonic vibration， the relationship between the spatial-temporal evolution of surface radial response displacement of rock at different depths and the development of its internal damage is analyzed by using the theory of stress wave propagation. The results show that the damage of rock under ultrasonic vibration is mainly caused by Hertz cone-shaped circular crack caused by high-frequency impact of the vibrating head and fatigue damage caused by the alternating stress of ultrasonic vibration. The propagation depth of Hertz cone-shaped circular crack is 10mm， and the fatigue damage crack mainly occurs at the depth of 10 to 20mm. There is obvious indication of radial response before the local macro fracture of rock under ultrasonic vibration. The radial response displacement of rock surface can be used as the failure criterion under ultrasonic vibration. The research in this paper is of great significance for enriching the mechanism of hard rock breaking under ultrasonic vibration |
| keywords:ultrasonic vibration vibratory rock breaking granite radial response displacement damage and fracture law |
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