کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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310865 | 533392 | 2010 | 11 صفحه PDF | دانلود رایگان |
This study was committed to the simulation of a roadway excavation in the geologically horizontal strata at great depth based on physical modeling test. A new approach of Physically Finite Elemental Slab Assemblage (PFESA) was employed for construction of the large-scale physical model simulating roadway excavation in stratified rocks. The roadway excavation without support in our test was designed as two phases, i.e. phase 1: full-face excavation and phase 2: staged excavation. The experimental test was carried out under the deep ground stress condition of unbalanced confinement. Rock response to the excavation was monitored and captured in real-time and over the entire field by using infrared (IR) thermography, incorporated with such image processing procedures as data statistics, noise removal and two-dimensional DFT (Discrete Fourier Transformation) for extracting features from the resulting thermographies. IRT, defined as the statistical mean value of the IR image matrix, was used as a measure of rock response, characterizing the full-face excavation, the staged excavation as a linear process and a non-linear process respectively by its time-Marching scheme within the IR radiation domain. The denoised IR images and the two-dimension Fourier spectra provide an enhanced understanding of the excavation response in terms of initiation, propagation and coalescence of rock damage in the spatial and frequency regimes respectively.
Journal: Tunnelling and Underground Space Technology - Volume 25, Issue 4, July 2010, Pages 366–376