王文, 曹学文, 洪磊,等.高温-水冷却循环作用下砂岩物理力学性能和损伤特征研究[J].河南理工大学学报（自然科学版）,2024,43(6):38-48.

WANG W, CAO X W, HONG L,et al.Study on the physical and mechanical properties and damage characteristics of sandstone under high temperature-water cooling cycles[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(6):38-48.

高温-水冷却循环作用下砂岩物理力学性能和损伤特征研究

王文, 曹学文, 洪磊, 雷钧祺, 周青山

河南理工大学 能源科学与工程学院，河南 焦作 454000

摘要: 目的 为研究砂岩在多次高温-水冷却循环作用下的物理力学性能和损伤特征，  方法 对砂岩进行200~600 ℃下高温-水冷却循环试验。通过超声波纵波波速测试、物理参数测量、单轴压缩试验，分析高温-水冷却循环对砂岩物理力学性能的影响及损伤特征。  结果 结果表明：温度低于400 ℃时，砂岩试样质量损失较少，高于400 ℃时，质量损失较严重；随着温度升高和高温-水冷却循环次数增加，砂岩试样质量损失率增加，纵波波速降低；砂岩试样的弹性模量和峰值抗压强度在600 ℃时迅速下降，500~600 ℃时，存在影响砂岩试样弹性模量和峰值抗压强度的温度阈值；温度升高，砂岩试样损伤加剧，200 ℃时，随着高温-水冷却循环次数增加，砂岩试样强度提升，温度高于200 ℃时，随着循环次数增加，砂岩试样损伤加剧；砂岩试样单轴破坏模式以剪张复合破坏为主，随着循环次数增加，砂岩试样由斜向剪切破坏向锥形剪切破坏过渡，温度越高，砂岩试样锥形破坏块体越大。  结论 研究结果表明，高温-水冷却循环后，砂岩试样的物理力学性质严重劣化。

关键词:岩石力学;高温砂岩;物理参数;水冷却循环;应力特征

doi:10.16186/j.cnki.1673-9787.2021110019

基金项目:国家自然科学基金资助项目（52174109）；河南省高校科技创新人才支持计划项目（23HASTIT011）；安全学科“双一流”创建工程入库项目（AQ20230501）

收稿日期:2022/11/09

修回日期:2023/09/12

出版日期:2024-09-24

Study on the physical and mechanical properties and damage characteristics of sandstone under high temperature-water cooling cycles

WANG Wen, CAO Xuewen, HONG Lei, LEI Junqi, ZHOU Qingshan

School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract: Objectives To study the physical and mechanical characteristics of sandstone under multiple high temperature-water cooling cycles， Methods the sandstone was subjected to high temperature-water cooling cycle tests at 200~600 ℃. The influence of these cycles on the physical and mechanical properties of sandstone samples was analyzed using ultrasonic longitudinal wave velocity test， physical parameter measurements， and uniaxial compression tests.  Results The results showed that the mass loss of sandstone samples was lower at temperatures below 400 ℃， but became more significant at temperatures above 400 ℃. As both the temperature and the number of high temperature-water cooling cycles increased， the mass loss rate of the sandstone samples increased， and the longitudinal wave velocity decreased. The elastic modulus and compressive strength of the samples decreased rapidly at 600 ℃， with a temperature threshold affecting these properties between 500~600 ℃. At 200 ℃， the strength of the sandstone samples increased with the number of cycles， but when the temperature exceeded 200 ℃， the damage increased with the number of cycles. The uniaxial failure mode of the sandstone samples was primarily shear-tension composite failure. With more cycles， the failure mode transferred to conical shear failure， and higher temperatures resulted in larger conical failure blocks.  Conclusions The study indicated that the physical and mechanical properties of sandstone samples deteriorated significantly after high temperature-water cooling cycles.

Key words:rock mechanics;high temperature sandstone;physical parameter;water cooling cycle;stress characteristic