超声波振动下不同应力条件对岩石强度影响的试验

doi:10.13278/j.cnki.jjuese.20180192

吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (3): 755-761.doi: 10.13278/j.cnki.jjuese.20180192

超声波振动下不同应力条件对岩石强度影响的试验

尹崧宇¹, 赵大军²

1. 中交天津航道局有限公司天津市疏浚工程技术企业重点实验室, 天津 300450;
2. 吉林大学建设工程学院, 长春 130026

收稿日期:2018-07-18 出版日期:2019-05-26 发布日期:2019-06-03
通讯作者: 赵大军(1964-),男,教授,博士生导师,主要从事地下钻采技术方面的研究,E-mail:1729333689@qq.com E-mail:1729333689@qq.com
作者简介:尹崧宇(1989-),男,博士,主要从事地下钻采技术方面的研究,E-mail:15421072@qq.com
基金资助:
国家自然科学基金项目（41572356）

Experiment on Effect of Different Stress Conditions on Rock Strength Under Ultrasonic Vibration

Yin Songyu¹, Zhao Dajun²

1. Tianjin Key Laboratory for Dredging Engineering Enterprises, CCCC Tianjin Dredging Co. Ltd., Tianjin 300450, China;
2. Construction Engineering College, Jilin University, Changchun 130026, China

Received:2018-07-18 Online:2019-05-26 Published:2019-06-03
Supported by:
Supported by National Natural Science Foundation of China(41572356)

摘要/Abstract

摘要： 振动有助于碎岩，以往关于振动碎岩机理的研究大多在低频率段展开。为填补超高频率段下振动碎岩机理的空白，采用单轴动静组合加载模式，开展了超声波振动下不同应力条件对岩石强度影响的试验研究，其中超声波振动频率为20 kHz，预压范围为100~500 N。研究结果表明：当预压小于200 N时，岩石内部应力状态无法满足强度准则，岩石强度下降不明显；当预压大于等于200 N时，岩石强度随振动时间的增加而逐渐降低且存在最优预压力值（400 N）使得岩石强度最低。缩短振动频率与岩石固有频率的差值有利于提高超声波振动碎岩效率。

关键词: 超声波振动, 预压力, 数值模拟, 抗压强度

Abstract: Vibration contributes to crushing of rocks. Research on the mechanism of vibrating rock is usually carried out in the low frequency range. In order to fill in the gap of the mechanism of rock crushing by vibration of ultra-high frequency section, an experimental study on the effect of ultrasonic vibration on rock strength under different stress conditions was conducted based on static and dynamic loading models, under the condition that the ultrasonic vibration frequency was 20 kHz, and the preloading range was 100-500 N. It is demonstrated that the rock strength remained unchanged basically when the preloading was less than 200 N. The reason is that the internal stress state of rock did not meet the strength criterion. When the preloading was more than 200 N, the rock strength increased with vibration duration, and there is an optimal preloading value (400 N) to minimize the rock strength. The efficiency of ultrasonic vibration rock crushing can be improved by narrowing the difference between the vibration frequency and the natural frequency of the rock.

Key words: ultrasonic vibration, preloading, numerical simulation, compressive strength

中图分类号:

P634.1

尹崧宇, 赵大军. 超声波振动下不同应力条件对岩石强度影响的试验[J]. 吉林大学学报(地球科学版), 2019, 49(3): 755-761.

Yin Songyu, Zhao Dajun. Experiment on Effect of Different Stress Conditions on Rock Strength Under Ultrasonic Vibration[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(3): 755-761.

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超声波振动下不同应力条件对岩石强度影响的试验

Experiment on Effect of Different Stress Conditions on Rock Strength Under Ultrasonic Vibration

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