天然帶磁圓柱巖石試件壓縮過程應(yīng)力磁強(qiáng)效應(yīng)研究
[Abstract]:When the earthquake occurs, the earthquake source buried deep underground, the preparation, development and occurrence of the earthquake is difficult to directly explore, resulting in a large gap between the ground needs research work and the disaster prevention requirements. It is of great significance to understand the evolution of microcracks and the changing process and law of the development of rock under stress, which is of great significance to ensure the safety of engineering. The natural rock all has the certain intensity magnetism, when the rock is subjected to the external force, the microfissure in the rock will change, the distribution of the magnetic field around the rock will also change, the magnetic field will change with the change of the rock fissure. It is based on this theory that the magnetic physical quantity magnetic intensity is introduced into the study of rock compression fracture process. In this experiment, the natural magnetic cylindrical rock specimen is used as the research object to simulate the process of stress energy from accumulation to release in the process of compression fracture of rock in the crust, and to prepare earthquake for the source. The relationship between stress change and magnetic intensity variation in rock is simulated under finite conditions. At the same time, considering the spatial distance between the earthquake source and the surface, the paper studies the method of measuring the magnetic intensity near the rock by remote sensing, establishes the theoretical model of the variation of the rock fracture and magnetic intensity, and explores the mechanism of the change of the magnetic field of the fault. In this experiment, the axial loading system and data acquisition system are used to carry out axial loading and real-time monitoring to obtain four physical quantities: vertical load (stress), vertical displacement (strain), magnetic intensity, test time, etc. The corresponding relationship between them is found through data processing and analysis, and the analysis method of seismic geomagnetic observation data based on the experimental study of stress and magnetic intensity of rock compression fracture is presented, which relates the mechanical properties of rock to the basic physical quantity of electromagnetism. A large number of experimental results show that the stress increases with the increase of strain, and the magnetic intensity decreases with the increase of strain at the stage of stress rise, and the stress and magnetic intensity are approximately antisymmetric. At the stage of stress decreasing, that is, the bearing capacity of rock is lost after failure, the magnetic intensity of rock changes suddenly, and then increases or decreases. When the rock is about to reach the maximum stress, the rate of change of the magnetic intensity, that is, the slope of the change of the magnetic intensity with time, will change, and the phenomenon of the fluctuation will occur, and the magnetic condition of the rock itself. There is a great relationship between the fracture and the failure form.
【學(xué)位授予單位】:東北大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:TU45
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