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Study on Damage Evolution and Acoustic Emission Characteristics of Sandstone at Uniaxial Compressive Loading

Author: HeShunYou
Tutor: LiuBaoXian
School: West China University
Course: Geotechnical Engineering
Keywords: Acoustic emission count the number of Damage variable Fractal
CLC: TU452
Type: Master's thesis
Year: 2010
Downloads: 147
Quote: 0
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Abstract


With the continuous development of economic construction, the use of rock engineering is growing, underground development continue toward the deep major the rock engineering Accidents often occur, in order to avoid the occurrence of these accidents, it is necessary to carry out effective monitoring of the project in the rock mass, predict the strength and stability of the rock mass, prevent rock burst, to provide reliable data for the project, and to guide the project's safety. In this paper, the experimental study, theoretical analysis of the method of combining damage evolution of sandstone under different loading rates and acoustic emission characteristics were analyzed, and some research. First, the axial displacement control loading uniaxial compression test, the sandstone under different loading rates stress - strain curve, some basic mechanical parameters of the sandstone, explores the sandstone under different loading rates some variation of these basic mechanical parameters of sandstone. Uniaxial compression experiment of acoustic emission, acoustic emission instrument acoustic emission signals collected in the process of loading tests, acoustic emission characteristics of sandstone under different loading rates of injury characteristics and damage process analysis, discussion of sandstone and Summary sandstone the damage deformation characteristics, characteristics of the acoustic emission count the number of acoustic emission energy counting characteristics, as well as the acoustic emission process fractal. By uniaxial compression test, the sand with different loading rate, the mechanical properties will be some changes, the performance in the uniaxial compressive strength with the increase of the loading rate and showed increasing trend, while its elastic modulus Poisson's ratio will increase with the loading rate enhancement, but this trend is not obvious. Acoustic emission experiments, sandstone sandstone damage evolution of acoustic emission count during the loading process - time curve presents several distinct phases: Acoustic Emission initial stage, the acoustic emission calm stage, acoustic emission growth stage, acoustic emission stability stage. The first two stages located in the damage process of sandstone compaction stage, the latter two stages respectively corresponding to elastic deformation and plastic deformation of the sandstone injury until the failure stage, through the acoustic emission energy and time curve analysis can be drawn these rules, just do not count the number of less obvious. Damage evolution based on acoustic emission curve derived sandstone damage evolution in the process: the stage of initial damage, damage stability in the evolution and development stage, damage the rapid development stage, residual damage stage. Fractal acoustic emission count the number of studies have found that the sandstone in uniaxial compression process, the sound emission the correlation dimension count number change with sandstone internal damage evolution has consistency, changes in the correlation dimension characterization of sandstone internal fissures The development of the situation.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Rock ( rock ) mechanics and rock testing > Rock mechanical properties and stress theory
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