Effect of loading rates on the characteristics of thermal damage for mudstone under different temperatures
Effect of loading rates on the characteristics of thermal damage for mudstone under different temperatures
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DOI：
10.1016/j.ijmst.2015.07.015
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发表时间：
2015-09-01
影响因子：
11.8
通讯作者：
Liu Ruixue
中科院分区：
文献类型：
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作者：
Mao Rongrong;Mao Xianbiao;Liu Ruixue
利用岩石力学伺服试验系统MTS810和高温炉MTS652.02，对4种不同加载速率的泥岩试件进行了从室温到400℃的单轴压缩试验。研究了不同加载速率的泥岩在不同温度条件下的力学性质。结果表明，当温度从室温升高到400℃，加载速率小于0.03 mm/S时，泥岩试件的峰值强度随加载速率的增加而降低，当加载速率超过0.03 mm/S时，各峰值强度出现显著差异；在200~400℃温度范围内，随着加载速率的增加，弹性模量值呈下降趋势。随着加载速率的增加，泥岩中的碎屑数量越来越多，加载速率较高的泥岩中甚至可以观察到粉末状颗粒。在高加载速率下，不同温度下泥岩试件的破坏模式主要为锥形破坏。(C)爱思唯尔集团代表中国矿业大学出版的《2015》。
The uniaxial compression tests for mudstone specimens are carried out with four different loading rates from room temperature to 400 degrees C by using the Rock Mechanics Servo-controlled Testing System MTS810 and high temperature furnace MTS652.02. The mechanical properties of mudstone with various loading rates are studied under different temperature conditions. The results show that when temperature increases from room temperature to 400 degrees C and loading rate is less than 0.03 mm/s, the peak strength of mudstone specimen decreases as loading rate increases, while the various peak strengths show significant differences when loading rate exceeds 0.03 mm/s. At room temperature, the elastic modulus decreases at the first time and then increases with loading rate rising. When the temperature is between 200 and 400 degrees C, the elastic modulus presents a decreasing trend with increasing loading rate. With increasing the loading rate, the number of fragments in mudstone becomes larger and even the powder is observed in mudstone with higher loading rate. Under high loading rate, the failure mode of mudstone specimens under different temperatures is mainly conical damage. (C) 2015 Published by Elsevier B.V. on behalf of China University of Mining & Technology.