基于单轴压缩声发射试验的层状岩体损伤规律分析

Damage Law Analysis of Layered Rock Mass Based on Uniaxial Compression Acoustic Emission Test

层状岩体的损伤破坏规律是岩土工程研究领域中的重要问题之一。以含层理倾角岩体为研究对象,对现有的单轴压缩声发射试验成果开展试验分析、理论研究和数值模拟。结果表明,层理构造对岩体破坏模式影响显著;利用声发射信号响应特征描述层状岩体在轴向荷载作用下损伤破坏规律具有良好效果;基于改进Duncan模型建立的新损伤模型适用于层状岩体在轴向荷载作用下的损伤演化分析,并利用有限元数值模拟对模型做了进一步验证。研究成果可为层状岩体损伤规律的后续研究提供一定的理论参考和技术支持。

The damage and failure law of layered rock mass is one of the important problems in geotechnical engineering.The experimental analysis,theoretical research and numerical simulation of the existing uniaxial compression acoustic emission test results are conducted with the bedding incline rock mass as the research object.The results show that the bedding structure has a significant influence on the failure mode of rock mass.It is effective to describe the damage and failure law of layered rock mass under axial load by using acoustic emission signal response characteristics.The new damage model based on the improved Duncan model is suitable for the damage evolution analysis of layered rock mass under axial load,and the model is further verified by finite element numerical simulation.The research results can provide theoretical reference and technical support for the subsequent research on the damage law of layered rock mass.