单轴载荷下不同含水率砂岩力学和红外辐射特征

Mechanical and infrared radiation properties of sandstone with different water contents under uniaxial compression

为揭示水对砂岩受力和红外辐射特性影响,开展不同含水率砂岩的单轴压缩试验,并进行红外辐射监测。研究结果表明:随着含水率增加,砂岩的单轴压缩强度、弹性模量逐渐降低,说明水对岩石的力学性质起到了一定的"软化"作用;含水率对砂岩红外辐射特性影响较大,砂岩含水率越高,其从初始时刻到最高应力时刻的升温幅度越大;含水率越高的砂岩试样表面平均红外辐射温度(AIRT)随时间变化的波动越小,温度随应力增加而增加的趋势越明显;含水岩石在临破裂前红外热像变化较平稳,没有温度异常,而对于干燥岩石,其临破裂前表面平均红外辐射温度突然增大,出现较明显的高温异常条带。

In order to investigate the effect of water on mechanical and infrared radiation properties of rock, a series of uniaxial compressive tests were conducted on sandstone specimens with different water contents, and the infrared radiation characteristics were monitored. The results show that with the increase of water content, both of uniaxial compressive strength and elastic modulus of specimens decrease, which indicates that the sandstone becomes ＂soft＂ when the water content increases. Water contents have great influence on the infrared radiation characteristics of rocks. For specimen with higher water content, the amplitude of temperature rising is greater, and the variation of average infrared radiation temperature（AIRT） with time has smaller fluctuation. The temperature shows a more obvious increasing trend with the increase of external load. For wet specimens, the AIRT changes mildly with the increase of loading, and there is no temperature anomaly on the surface. However, AIRT of dry specimens increases abruptly and high-temperature anomaly strips can be monitored.