摘要
工程体和地质体间的相互作用是土木与水利工程建设稳定性分析的重要研究对象,因此明确揭示岩石-混凝土一体两介质体的损伤破坏问题是十分必要的。基于齐热哈塔尔引水隧洞围岩-衬砌结构,以岩石-混凝土一体两介质体为物理模型,进行单轴声发射试验。研究了声发射参数变化的物理意义,并建立了离散元数值模型来探究两介质体的破坏机理。研究表明,单轴压缩试验中两介质体展现出连续介质力学的特性,主裂纹由混凝土部分向岩石部分延伸;声发射参数骤增点可作为两介质体破坏失稳的前兆信息;揭示了岩石-混凝土一体两介质体的基本力学特性和其破坏机理,证实了声发射参数骤增点即为混凝土裂缝贯穿交界面向岩石延伸、介质体加速损伤临近失稳破坏的时刻。
The interaction between engineering and geological bodies is an important research object in the stability analysis of civil and hydraulic engineering construction.It is necessary to clearly reveal the damage and failure of rock-concrete integrated medium.Based on the surrounding rock-lining structure of the Qirehatar diversion tunnel,the uniaxial acoustic emission test is carried out with the rock-concrete integrated medium as the physical model and the physical meaning of the change of the acoustic emission parameters is studied.A discrete element numerical model is established to study the failure mechanism of two medium bodies.The study shows that the two medium bodies exhibit the characteristics of continuum mechanics in the uniaxial compression test and the main crack extends from the concrete part to the rock part.The sudden increase of acoustic emission parameters can be used as the precursor information of the failure and instability of the two medium bodies.The basic mechanical properties and the failure mechanism of rock-concrete integrated medium are revealed.Confirming that the sudden increase point of the acoustic emission parameters is the moment when the concrete crack extends through the interface to the rock and the accelerated damage of the medium is nearing the instability and failure.
作者
宿辉
张玉廷
李琦
袁周祥
高轩
SU Hui;ZHANG Yu-ting;LI Qi;YUAN Zhou-xiang;GAO Xuan(College of Water Conservancy and Hydropower,Hebei University of Engineering,Handan 056038,China;Huanghe Wanjiazhai Water Conservancy Hub Co.,Ltd., Taiyuan 030002,China)
出处
《科学技术与工程》
北大核心
2019年第23期206-210,共5页
Science Technology and Engineering
关键词
一体两介质
单轴压缩试验
声发射试验
离散元方法
integrated two media
uniaxial compression test
acoustic emission test
discrete element method
