| 高温后砂岩抗拉强度及应变场演化实验研究 |
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| 引用本文： | 王来贵,张阳,刘向峰,初旭光.高温后砂岩抗拉强度及应变场演化实验研究[J].中国安全生产科学技术,2018,14(3):57-64. |
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| 作者姓名： | 王来贵 张阳 刘向峰 初旭光 |
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| 作者单位： | （1.辽宁工程技术大学 力学与工程学院，辽宁 阜新 123000；2.中国中铁十四局 第一工程发展有限公司，山东 日照 276800） |
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| 摘 要： | 为研究高温后砂岩的抗拉力学特性及变形破坏规律，对不同温度作用后的砂岩进行巴西劈裂实验，同时采用数字散斑相关方法对砂岩变形破坏进行监测。研究表明:高温作用后砂岩质量损失率增加，波速整体呈降低趋势，砂岩物理特性出现一定劣化；高温作用使砂岩抗拉强度呈先增加后减小的趋势，25~400℃增大了16.08%，400~1 000℃减小了69.30%，砂岩表现为脆性破坏特征；砂岩劈裂过程中，水平应变场演化过程为:局部小变形产生、扩展→小变形区域聚集、合并、连接→应变局部化带产生→应变局部化带扩展并贯穿→宏观劈裂破坏；随着温度升高，应变局部化启动水平先增加后降低，400℃为转折点。该研究方法可为煤矿火灾安全等领域提供借鉴。
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| 关 键 词： | 高温 砂岩 变形破坏 数字散斑 抗拉强度 |
Experimental study on tensile strength and strain field evolution of sandstone after high temperature |
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| WANG Laigui,ZHANG Yang,LIU Xiangfeng,CHU Xuguang.Experimental study on tensile strength and strain field evolution of sandstone after high temperature[J].Journal of Safety Science and Technology,2018,14(3):57-64. |
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| Authors: | WANG Laigui ZHANG Yang LIU Xiangfeng CHU Xuguang |
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| Affiliation: | (1. College of Mechanics and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China;
2. 1st Engineering Development Co., Ltd., China Railway 14th Bureau Group, Rizhao Shandong 276800, China) |
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| Abstract: | In order to study the tensile mechanical characteristics and the laws of deformation and failure of sandstone after high temperature, the Brazilian split tests on sandstone under the effect of different temperatures were carried out, at the same time, the deformation and failure of sandstone were monitored by using the digital speckle correlation method. The results showed that after the effect of high temperature, the mass loss rate of sandstone increased, the wave velocity presented the decrease trend as a whole, and the physical properties of sandstone appeared a certain deterioration. The tensile strength of sandstone increased first and then decreased under the effect of high temperature, which increased by 16.08% in the temperature range of 25-400℃ and decreased by 69.30% in the temperature range of 400-1000℃, and the sandstone presented the characteristic of brittle failure. The evolution process of the horizontal strain field in the process of sandstone splitting was the generation and expansion of local small deformation, the gathering, merging and connection of a small deformation area, the formation of strain localization band, the expansion and penetration of strain localization band, and the macroscopic splitting failure. With the increase of temperature, the starting level of strain localization increased first and then decreased, and 400℃ was the turning point. This method can provide the reference for the fire safety of coal mine and other fields. |
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| Keywords: | high temperature sandstone deformation and failure digital speckle tensile strength |
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