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首页> 外文期刊>Tunnelling and underground space technology >Thermal image and spectral characterization of roadway failure process in geologically 45 degrees inclined rocks
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Thermal image and spectral characterization of roadway failure process in geologically 45 degrees inclined rocks

机译：45度地质倾斜岩巷道破坏过程的热图像和光谱表征

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摘要

Large-scale geomechanical model test was conducted in order to investigate stability of an un-supported tunnel with rectangular cross section embedded in 45 inclined alternating strata of sandstone, mudstone and coal seam. The loading path consists of two groups: cases A-G with overburden depths from 296 to 948 m and small loading rate, and cases H-M with overburden depths from 1126 to 2047 m and fast loading rate. Infrared thermography, incorporated with image processing and Fourier transform, was employed to characterize the rock responses. Averaged temperature field, < IRT >, represents energy release rate, oscillating at stick-slip pattern with different periods and amplitudes. Overburden depth and loading speed have a significant impact on < IRT > curve, i.e. small overburden depth and loading speed corresponds to long period and small amplitude; whereas, great overburden depth and fast loading speed to short period and high amplitude. The processed thermal image best represents rock behavior by two major IRT distribution modes. For loading cases A-G, the coal strata were over stressed indicated by high IRT while the mudstone strata were less stressed represented by low IRT, corresponding to the static interlayer friction. For loading cases H-M, the mudstone strata were over stressed indicated by high IRT while the coal strata were less stressed indicated by low IRT, corresponding to the dynamic friction. Fourier spectra and spatial frequency were employed to characterize the infrared sequence. Ultra-high spatial frequency component is a precursor for predicting the imminent dynamic event. Low spatial frequency component may be served as an indicator of the tunnel-wide sphere of influence that the stress redistribution extends. (C) 2015 Elsevier Ltd. All rights reserved.
机译：为了研究在45°倾斜砂岩，泥岩和煤层交替地层中埋置的矩形截面无支撑隧道的稳定性，进行了大规模的地质力学模型试验。加载路径由两类组成：A-G覆盖层深度为296至948 m且加载速率较小的情况，H-M加载层深度为1126至2047 m且加载速率较高的情况。结合图像处理和傅立叶变换的红外热成像技术被用来表征岩石的响应。平均温度场代表能量释放率，以不同周期和幅度的粘滑模式振荡。上覆深度和加载速度对曲线有显着影响，即上覆深度小和加载速度对应于长周期和小幅度；上覆深度大，加载速度快，周期短，振幅大。经过处理的热图像通过两种主要的IRT分布模式最能代表岩石行为。对于A-G加载情况，高IRT表示煤层应力过大，而低IRT表示泥岩层应力较小，这与层间静摩擦相对应。对于H-M加载情况，高IRT表示泥岩地层应力过大，而低IRT表示煤层应力较小，这与动摩擦相对应。利用傅立叶光谱和空间频率来表征红外序列。超高空间频率分量是预测即将发生的动态事件的先兆。低空间频率分量可以用作应力重新分布扩展的隧道范围影响范围的指标。 （C）2015 Elsevier Ltd.保留所有权利。

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