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首页> 外文期刊>International Journal of Rock Mechanics and Mining Sciences >Mechanical property and thermal damage factor of limestone at high temperature
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Mechanical property and thermal damage factor of limestone at high temperature

机译：高温下石灰石的机械性能和热损伤系数

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摘要

Experiments with ten groups of limestone specimens (four samples per group) under ten specific temperatures, 25 degrees C, 100 degrees C, 200 degrees C, 300 degrees C, 400 degrees C, 500 degrees C, 600 degrees C, 700 degrees C, 800 degrees C, and 900 degrees C, show that the high-temperature effect on the elastic modulus of rocks conforms to thermoelastic responses with a quadratic temperature function. The thermal damage factor can be reduced, by ignoring the effect of Poisson's ratios and densities, to simply a ratio of the P-wave velocities before and after high-temperature treatments. Based on the collected experimental data, we correlate the P-wave velocities change rate with both the peak compressive strength and effective solid matrix. It demonstrates that the high-temperature effect on the thermal damage factor can be directly expressed as the rate of change in the peak compressive strength and effective solid matrix. All these properties (thermal damage factor calculated by the P-wave velocity, peak compressive strength, and effective solid matrix) share a similar exponential trend with increasing temperature. The rates of change in the elastic modulus, P-wave velocity, peak compressive strength, and effective solid matrix also exhibit a similar powerful trend with increasing temperature. This study provides insight into the detailed characteristics of thermal damage related to the mechanical property of limestones exposed to high temperature.
机译：用十组石灰石标本（每组四个样品）进行10个特定温度，25℃，100℃，200℃，300摄氏度，400℃，500摄氏度，600℃，700℃， 800℃和900摄氏度，表明岩石弹性模量的高温效应符合具有二次温度功能的热弹性响应。通过忽略泊松比和密度的效果，可以减少热损伤因子，仅仅是高温处理之前和之后的P波速度的比率。基于收集的实验数据，我们将P波速度变化率与峰值抗压强度和有效固体基质相关联。它表明，对热损伤因子的高温效应可以直接表示为峰值抗压强度和有效固体基质的变化率。所有这些属性（通过P波速度计算的热损伤因子，峰值抗压强度和有效的固体矩阵）与升高的温度相比，共用了类似的指数趋势。弹性模量，P波速度，峰值抗压强度和有效固体基质的变化率也表现出类似的强大趋势随着温度的增加。本研究提供了与暴露于高温暴露于高温的机械性能的热损伤的详细特征。

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