土无侧限抗压试验中的声发射特性研究

声发射检测技术因其无损、实时等优点已成为一种重要的无损检测与评价手段,但其在建筑工程领域尤其是岩土工程领域中的应用研究较少。将声发射技术应用于土的无侧限抗压试验,运用历经图和关联图的分析方法,研究土体受压过程中振铃计数、能量、持续时间、幅度这4个声发射特征参数的变化规律。试验结果表明,声发射技术可应用于土的无侧限抗压试验,声发射特征参数对土体受压过程中的应力的变化过程有很高的敏感度。

Acoustic Emission Characteristic in Soil Unconfined Compression Test

Acoustic emission detection technology has become an important method for nondestructive testing and evaluation because of its advantages such as nondestructive and real-time. The application of acoustic emission detection technology in the field of construction engineering, especially in geotechnical engineering, is seldom studied. Applying acoustic emission techniques for soil unconfined compression test, the change law of acoustic emission parameters such as counts, energy, duration and amplitude in the process of soil compression was studied by using the analysis approach of time-relationship and association diagram. Experimental results show that acoustic emission technology can be used in soil unconfined compression test. Acoustic emission parameters are very sensitive to the variation of stress and strain in the process of soil compression.