Abstract The rock failure process is always accompanied by dilatancy. This study investigated the average infrared radiation temperature (AIRT) characteristics in the rock dilatancy process. An Infrared Radiation (IR) dilatancy precursor point was found prior to the failure of the rocks under load. During the uniaxial loading process, the stress levels of upward-AIRT and downward-AIRT rock samples at the initial point of rock dilatancy were 0.74 σmax and 0.80 σmax, respectively. After rock dilatancy, the AIRT change rate of upward-AIRT sample increased by 1.48 × 10−4°C⋅s−1, and AIRT change rate of downward AIRT sample dropped by 1.29 × 10−4°C⋅s−1. From the initial point to the process reached rock failure, the AIRT change was almost linearly correlated with volumetric strain increment. Based on the IR thermogram, the IR hot spot was defined, and a new index—high temperature point scaling factor (HTPSF)—was proposed for qualitative analysis. The calculated HTPSF values of upward-AIRT and downward-AIRT rock samples at the IR dilatancy precursor point were 0.4 and 0.6, respectively. This study provides a new thought to determine the initial point of rock dilatancy.

中文翻译：

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砂岩剪胀过程红外辐射特性试验研究

摘要 岩石破坏过程总是伴随着剪胀。本研究研究了岩石剪胀过程中的平均红外辐射温度（AIRT）特性。在岩石在载荷作用下发生破坏之前发现了一个红外辐射 (IR) 剪胀前体点。在单轴加载过程中，岩石剪胀初始点的向上AIRT和向下AIRT岩石样品的应力水平分别为0.74 σmax和0.80 σmax。岩石剪胀后，向上AIRT样品的AIRT变化率增加了1.48×10-4°C⋅s-1，向下AIRT样品的AIRT变化率下降了1.29×10-4°C⋅s-1。从初始点到过程达到岩石破坏，AIRT 变化与体积应变增量几乎呈线性相关。根据红外热谱图，定义了红外热点，并提出了一个新的指标——高温点比例因子（HTPSF）——用于定性分析。在红外剪胀前兆点处，向上AIRT 和向下AIRT 岩石样品的计算HTPSF 值分别为0.4 和0.6。该研究为确定岩石剪胀初始点提供了新思路。