高频超声波技术在构造岩石学研究中的应用——以郯庐断裂带南段巢湖地区为例

APPLICATION OF HIGH-FREQUENCE ULTRASONIC WAVE TECHNOLOGY TO TECTONO-PETROLOGY——TAKING CAOHU AREA OF SOUTH PART OF TANCHENG-LUJIANG FAULT BELT AS EXAMPLE

应用高频超声波技术对皖东郯庐断裂带南段巢湖地区凤凰山背斜进行了纵波波速的系统测试,讨论了波速大小与应力之间的对应关系,分析了背斜核部的应力分布状态,给出了不同构造变形部位的应力相对大小与其超声波速的半定量关系,从理论和实践上探讨了超声波测试应用在构造岩石研究中的可行性。研究结果表明,高频超声波检测应用在地质构造研究中有其可能性和可行性。波速大小与构造变形的岩石中地质应力的量级有关,在凤凰山背斜处根据波速得出的应力结果与理论推导一致;根据波速结合构造、岩性可以较准确地确定应力分布的状态及应力强度最大的部位。这对于构造岩石学研究以及指导工程地质学实践具有一定借鉴意义。与其他方法相比较,超声法比较简单,测试精度高,有较好的应用前景。

A new method using high-frequency ultrasonic wave technique to the study of structural geology is presented. The relationship between wave velocity and stress in rocks is discussed,and the state of stress distribution in the core parts of anti-cline is presented. The study results show that the ultrasonic wave technology is a possible tool for the study of tectono-petrology. The distributions of wave velocity have close relation to that of stress quality in the deformed rocks. The stress distributions in Fenghuangshan anti-cline obtained by wave velocity are of the same rule with the theoretic deduction. With the ultrasonic wave technique,the distributions of the stress state and the strongest locations can be easily and accurately determined,which is very helpful to the study of tectono-petrology as well as the practice of engineering geology. Comparing with the other methods of studying tectono-petrology,the ultrasonic wave technique is of merit of simple control and high accuracy.