Physical modeling of deep ground excavation in geologically horizontal strata based on infrared thermography

An overview of the thermography-based experimental studies on roadway excavation in stratified rock masses at CUMTB

“…The fact that infrared radiation energy varies with the change of stress field of the loaded rocks was further verified by the subsequent studies: uniaxial and biaxial loading of sedimentary rocks and igneous rocks; the structural stress fields of rock and gas burst disasters resulting in local abnormal high temperature in mine; projectile impact on rock; the roadway tunnel under plane loading and its excavation process in a physical analog model consisting of alternating layers of sandstone, mudstone and coal, inclined at 0°a nd 90°dip angles [26][27][28][42][43][44][45].…”

“…For the sake of simplicity, the normalized hf ij i k is also referred to as ''IRT'', which actually represents: (a) IRT variations relative to the model's intact state; and (b) the energy release level relative to the maximum mean value of IRT. Detailed computation procedures can be found in the literature [27]. The IR image series, representing the temporal and spatial evolution of the structural and mechanical rock behaviors, can be reconstructed by the IR matrix data sets.…”

“…Contrast sharpening and feature extraction from the noise contained IR thermographies are our expertise. In this study, we used the so-called ''multiple denoising algorithm'' to process the IR data sets and reconstruct the IR images [27]. Very good results were achieved by using the proposed algorithms, leading to an enhanced understanding of the rock response.…”

“…This paper provides an overview of the excavation experiments and studies conducted at the CUMTB' state key laboratory since 2006, which involve excavation of an roadway tunnel in the physical analog model with layered rocks dipping at 0°, 45°, 60°, and 90°. The paper highlights the use of infrared (IR) thermography and the image processing techniques for characterization of the space-time evolution of the excavation-induced damage in horizontal strata, vertical strata, 45°inclined strata, and 60°inclined strata [27][28][29][30]. The information in this paper is supplemented with additional information in other papers in this issue.…”

Skewed pressure characteristics induced by step-by-step excavation of a double-arch tunnel based on infrared thermography

“…He et al simulated a roadway excavation in the geologically horizontal strata at great depth based on physical modeling test by using infrared thermography. The infrared thermography provided an enhanced understanding of the excavation response in terms of initiation, propagation and coalescence of rock damage in the spatial and frequency regimes respectively [15]. Chen et al employed the equivalent material simulating experiments and thermal infrared imager equipments to study the rules of deformation and failure of surrounding rock induced by rock burst [16].…”