三轴应力条件下干湿循环对砂岩力学与蠕变特性研究

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0011

中国安全科学学报 ›› 2025, Vol. 35 ›› Issue (S2): 154-160.doi: 10.16265/j.cnki.issn1003-3033.2025.S2.0011

三轴应力条件下干湿循环对砂岩力学与蠕变特性研究

甘一雄¹^,²^,³(), 刘英杰¹^,²^,³, 孙祚¹^,³^,⁴^,^**(), 程业¹^,²^,³, 颜丙乾¹^,²^,³, 张婧雯¹^,³

¹ 煤炭科学研究总院有限公司, 北京 100013
² 露天煤矿灾害防治与生态保护全国重点实验室, 北京 100013
³ 天地科技股份有限公司, 北京 100013
⁴ 中国矿业大学(北京) 应急管理与安全工程学院, 北京 100083

收稿日期:2025-07-10 出版日期:2026-02-04
通信作者:
**孙祚(1990—),男,山东枣庄人,博士研究生,副研究员,主要研究方向为矿山灾害风险评估与预警等方面。E-mail: sun_zuo6@163.com。
作者简介:
甘一雄 (1992—),男,湖南常德人,博士,助理研究员,主要从事矿山边坡灾害监测预警与风险评价技术等方面的工作。E-mail: ganyixiong@126.com。
刘英杰研究员
孙祚副研究员
程业助理研究员
颜丙乾副研究员
张婧雯助理研究员
基金资助:
国家自然科学基金资助(52174188); 中国煤炭科工集团有限公司科技创新创业资金专项重点项目(2022-ZD002)

Effect of dry-wet cycles on mechanical and creep characteristics of sandstone under triaxial stress conditions

GAN Yixiong¹^,²^,³(), LIU Yingjie¹^,²^,³, SUN Zuo¹^,³^,⁴^,^**(), CHENG Ye¹^,²^,³, YAN Bingqian¹^,²^,³, ZHANG Jingwen¹^,³

¹ Chinese Institute of Coal Science, Beijing 100083, China
² State Key Laboratory of Disaster Prevention and Ecology Protection in Open-Pit Coal Mines, Beijing 100013, China
³ Tiandi Science & Technology Co., Ltd., Beijing 100013, China
⁴ School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China

Received:2025-07-10 Published:2026-02-04

摘要/Abstract

摘要：

为研究三轴应力条件下干湿循环作用对砂岩力学与蠕变特性的影响,基于经历0、2、4、8、16、32次干湿循环作用后的砂岩开展常规三轴压缩试验和蠕变试验。试验结果表明:砂岩的抗压强度σ_c、弹性模量E及泊松比μ与干湿循环次数呈负相关,与所施加的三轴围压呈正相关;以脆性指标定量表征砂岩的脆性,脆性指标与干湿循环次数呈负相关;砂岩蠕变破坏形式以剪切破坏为主,随着干湿循环次数的增加,最终蠕变应变增大,且8~16次干湿循环阶段中的蠕变平均增幅最高;干湿循环作用重塑砂岩的内部结构,随着循环次数增加,受载荷作用的砂岩变形及劣化加剧;砂岩结构的稳态性在8次干湿循环后被破坏,短期及长期力学特性均发生大幅度劣化,后续水岩作用逐渐减弱,劣化趋势逐渐放缓。

关键词: 三轴围压, 干湿循环, 力学特性, 蠕变特性, 脆性指标, 劣化机制

Abstract:

In order to study the influence of dry-wet cycles on the mechanical and creep characteristics of sandstone under triaxial stress conditions, conventional triaxial compression tests and creep tests were carried out based on sandstone subjected to 0, 2, 4, 8, 16, and 32 dry-wet cycles. The results show that the compressive strength σ_c, elastic modulus E, and Poisson's ratio μ of sandstone are negatively correlated with the number of dry-wet cycles and positively correlated with the applied triaxial confining pressure. The brittleness index for quantitatively characterizing the brittleness of sandstone is negatively correlated with the number of dry-wet cycles. The creep failure form of sandstone is mainly shear failure. With the increase of dry-wet cycles, the final creep strain increases, and the average increase rate of creep between eight and 16 dry-wet cycles is the highest. Dry-wet cycles reshape the internal structure of sandstone. With the increase of cycles, the deformation and deterioration of sandstone under load are intensified. After eight dry-wet cycles, the stability of the sandstone structure is destroyed, and the short-term and long-term mechanical characteristics deteriorate greatly. The subsequent water-rock interactions gradually are weakened, and the deterioration trends gradually slow down.

Key words: triaxial confining pressure, dry-wet cycle, mechanical characteristic, creep characteristic, brittleness index, deterioration mechanism

中图分类号:

X936

甘一雄, 刘英杰, 孙祚, 程业, 颜丙乾, 张婧雯. 三轴应力条件下干湿循环对砂岩力学与蠕变特性研究[J]. 中国安全科学学报, 2025, 35(S2): 154-160.

GAN Yixiong, LIU Yingjie, SUN Zuo, CHENG Ye, YAN Bingqian, ZHANG Jingwen. Effect of dry-wet cycles on mechanical and creep characteristics of sandstone under triaxial stress conditions[J]. China Safety Science Journal, 2025, 35(S2): 154-160.

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三轴应力条件下干湿循环对砂岩力学与蠕变特性研究

Effect of dry-wet cycles on mechanical and creep characteristics of sandstone under triaxial stress conditions

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