不同温度条件下花岗岩变形破坏及声发射时序特征

地震 ›› 2000, Vol. 20 ›› Issue (3): 87-94.

不同温度条件下花岗岩变形破坏及声发射时序特征

蒋海昆, 张流, 周永胜

中国地震局地质研究所,北京 100029

收稿日期:1999-09-21 修回日期:2000-01-03 出版日期:2000-07-31 发布日期:2022-09-30
作者简介:蒋海昆（1964-）,男,云南通海人,副研究员, 1996年在读博士生,主要从事地震活动性分析、地震综合预报、地震时空分形、岩石破裂实验及理论研究。
基金资助:
中国地震局“九五”科研攻关项目（95-04-02-01)及山东省自然基金项目（Y97E02079)的部分成果; 实验工作得到中国地震局构造物理开放实验室的经费支持; 中国地震局地质研究所论著（2000C0005)

Characteristics of AE temporal sequences in the process of deformation and failure of granite at high pressure, different temperatures

JIANG Hai-kun, ZHANG Liu, ZHOU Yong-sheng

Institute of Geology, CSB, Beijing 100029, China

Received:1999-09-21 Revised:2000-01-03 Online:2000-07-31 Published:2022-09-30

摘要/Abstract

摘要： 在 400 MPa围压及20~ 850℃的温度范围内,研究了花岗岩的变形破坏及声发射时序特征。结果表明,随环境温度的升高,岩石强度降低,破坏方式从突发式失稳逐渐转变为渐进式,破坏类型亦从脆性剪切破裂逐渐转变为半脆性、半延性和延性破坏。声发射数量随温度升高迅速减少,出现AE活动及AE活动明显增强的差应力水平亦有所提高。温度不太高时（250℃以下）,随破坏强度的临近,破前AE累计频度指数增长,其指数增长速率随温度增加而减小; 650℃以上的高温条件下破前已无 AE记录。温度对 AE序列的 b值具有重要的影响作用,总的来看b值在低温时较高而在高温时较低。研究结果还显示, AE 时间序列具有明显的多标度多分形特征,其性质主要决定于 AE的时间密集部分; 标度指数T的分布范围随温度增加而扩大,表明AE时间序列的标度类型随温度升高而增加,其时间结构趋于更加复杂、无序。

关键词: 声发射, 温度, 岩石强度, b值, 局域标度指数谱

Abstract: Under the condition of 400 MPa confining pressure and different temperatures （from room temperature to 850℃）, features of failure and AE temporal sequences of granite have been studied. The results show that rock strength of granite decreases gradually with rising of temperature. The sample failure mode changes from abrupt instability to gradual failure and the failure types of medium changes from brittle shear fracture into semi-brittle, semi-ductile and ductile failure. With rising of temperature, the numbers of AE events decrease quickly. Meanwhile, the level of differential stress at which AE emerges also has a little increase. Below 250℃, the cumulate number of AE before the failure correspond to the exponential increasing model while the failure approaching, and the rate of exponential increasing minimizes with rising of temperature; there is no AE events has been recorded at the high temperature （650℃ and above). There is obvious influence of temperature on b value of AE temporal sequences. The b-value is higher at low temperature than that at high temperature. It has been pointed out that the AE temporal sequences represent obvious multifractal characteristics, which mainly controlled by the temporal cluster feature of AE sequences. Distribution ranges of index Textend with rising of temperature, this means the scaling types of AE temporal sequences increase with rising of temperature, and its temporal structures become more complicated and disordered.

Key words: Acoustic Emission, Temperature, Rock strength, b-value, f (T)~ Tspectra

中图分类号:

P313

蒋海昆, 张流, 周永胜. 不同温度条件下花岗岩变形破坏及声发射时序特征[J]. 地震, 2000, 20(3): 87-94.

JIANG Hai-kun, ZHANG Liu, ZHOU Yong-sheng. Characteristics of AE temporal sequences in the process of deformation and failure of granite at high pressure, different temperatures[J]. EARTHQUAKE, 2000, 20(3): 87-94.

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