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Elastic modulus evolution of triaxially stressed mudstone at high temperature up to 400°C
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-08-18 , DOI: 10.1002/ese3.801 Zijun Feng 1, 2 , Chao Zhang 1, 2 , Fuke Dong 2 , Dong Yang 2
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-08-18 , DOI: 10.1002/ese3.801 Zijun Feng 1, 2 , Chao Zhang 1, 2 , Fuke Dong 2 , Dong Yang 2
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The elastic modulus is a key parameter in the constitutive equation of rock material, which changes with exterior conditions, including temperature. To study the evolution of the elastic modulus of the surrounding rock in some high‐temperature underground engineering works (eg, underground coal gasification, in situ pyrolysis of oil shale), a servo‐controlled rock testing machine was used in a study of the variation in elastic modulus of Jimsar mudstone (the roof stratum of Jimsar oil shale) when subjected to triaxial compression at high temperatures. The elastic modulus exhibited nonmonotonal variation when heated to 400°C while subjected to triaxial compression. This occurred in three stages. An empirical model involving piecewise linear function was used to quantitatively describe the relationship between elastic modulus and temperature. Elasticity increased between room temperature and 265°C, then weakened between 265 and 341°C, then increased at 341‐400°C, in accordance with the calculated result from the empirical model. Thermal expansion, thermal cracking, water loss, and structure reconstruction had a combined effect on the elastic modulus of the mudstone. The results will be helpful for understanding the mechanism of strata movement in some underground high‐temperature engineering operations.
中文翻译：
三轴应力泥岩在高达400°C的高温下的弹性模量演化
弹性模量是岩石材料本构方程中的关键参数，它会随着外部条件（包括温度）而变化。为了研究某些高温地下工程（例如，地下煤气化，油页岩的原位热解）中围岩弹性模量的变化，使用了伺服控制的岩石试验机来研究其变化。高温三轴压缩时Jimsar泥岩（Jimsar油页岩的屋顶地层）的弹性模量 当在三轴压缩下加热到400℃时，弹性模量表现出非单调变化。这发生在三个阶段。涉及分段线性函数的经验模型用于定量描述弹性模量和温度之间的关系。根据经验模型的计算结果，在室温至265°C之间，弹性增加，然后在265至341°C之间，弹性减弱，然后在341-400°C，弹性增加。热膨胀，热裂，失水和结构重建对泥岩的弹性模量有综合影响。研究结果将有助于理解某些地下高温工程作业中地层运动的机理。
更新日期：2020-08-18
中文翻译：
三轴应力泥岩在高达400°C的高温下的弹性模量演化
弹性模量是岩石材料本构方程中的关键参数，它会随着外部条件（包括温度）而变化。为了研究某些高温地下工程（例如，地下煤气化，油页岩的原位热解）中围岩弹性模量的变化，使用了伺服控制的岩石试验机来研究其变化。高温三轴压缩时Jimsar泥岩（Jimsar油页岩的屋顶地层）的弹性模量 当在三轴压缩下加热到400℃时，弹性模量表现出非单调变化。这发生在三个阶段。涉及分段线性函数的经验模型用于定量描述弹性模量和温度之间的关系。根据经验模型的计算结果，在室温至265°C之间，弹性增加，然后在265至341°C之间，弹性减弱，然后在341-400°C，弹性增加。热膨胀，热裂，失水和结构重建对泥岩的弹性模量有综合影响。研究结果将有助于理解某些地下高温工程作业中地层运动的机理。
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