水化作用下页岩力学强度的劣化行为实验

doi:10.3969/j.issn.1006-6535.2026.02.016

特种油气藏 ›› 2026, Vol. 33 ›› Issue (2): 143-150.DOI: 10.3969/j.issn.1006-6535.2026.02.016

水化作用下页岩力学强度的劣化行为实验

邵先宇¹, 王科¹, 王志强², 赵凌云^1,3,4, 李智渲⁵, 谭永胜⁶, 高为^1,7

1.贵州大学资环学院·喀斯特地质资源与环境教育部重点实验室,贵州贵阳 550025;
2.中国石油川庆钻探工程有限公司,四川成都 610051;
3.贵州省油气勘查开发工程研究院,贵州贵阳 550081;
4.自然资源部复杂构造区非常规天然气评价与开发重点实验室,贵州贵阳 550081;
5.四川长宁天然气开发有限责任公司,四川成都 610000;
6.中国科学院武汉岩土力学研究所,湖北武汉 430071;
7.贵州省煤层气页岩气工程技术研究中心,贵州贵阳 550014

收稿日期:2024-11-19 修回日期:2026-01-19 发布日期:2026-07-30
通讯作者: 王科(1990—),男,副教授,2014年毕业于长江大学石油工程专业,2019年毕业于西南石油大学油气田开发工程专业,获博士学位,现主要从事页岩气排采及储层评价研究工作。
作者简介:邵先宇(2000—),男,助理工程师,2022年毕业于西南科技大学地质工程专业,2025年毕业于贵州大学地质工程专业,获硕士学位,现主要从事页岩气开发基础性研究工作。
基金资助:
国家自然科学基金“基于气水交互驱动的页岩气储层微纳米孔隙排采机制研究——以正安常压页岩气井为例”(42462020);贵州省科技计划项目“页岩气井预注CO₂增压防井间压窜机理研究”(黔科合基础-ZK[2022]一般106)

Study on the deterioration behavior of shale mechanical strength under hydration

SHAO Xianyu¹, WANG Ke¹, WANG Zhiqiang², ZHAO Lingyun^1,3,4, LI Zhixuan⁵, TAN Yongsheng⁶, GAO Wei^1,7

1. College of Resources and Environment Engineering,Guizhou University Key Laboratory of Karst Georesources and Environment(Guizhou University),Ministry of Education,Guiyang,Guizhou 550025,China;
2. CNPC Chuanqing Drilling Engineering Co.,Ltd. Chengdu,Sichuan 610051,China;
3. Guizhou Oil and Gas Exploration and Development Engineering Research Institute, Guiyang, Guizhou 550081, China;
4. Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas, Ministry of Natural Resources, Guiyang, Guizhou 550081, China;
5. Sichuan Changning Natural Gas Development Co. LTD,Chengdu,Sichuan 610000,China;
6. Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;
7. Guizhou Research Center of Shale Gas and CBM Engineering Technology,Guiyang,Guizhou 550014,China

Received:2024-11-19 Revised:2026-01-19 Published:2026-07-30

摘要/Abstract

摘要： 针对水化作用对地下工程岩体力学强度影响不明确的问题,运用岩石力学实验与数值仿真相结合的方法,以龙马溪组页岩为研究对象,通过对不同浸泡时间下的岩石进行单轴抗压实验和Abaqus有限元数值分析,探讨水化作用对页岩力学性能的影响及其破坏机理。结果表明:水化作用会削弱页岩的内聚力,从而显著降低页岩的峰值应力和弹性模量,并且随着水化时间的延长,岩石的破坏模式由脆性破坏转变为塑性破坏;同时,水化作用对页岩力学强度的劣化存在临界点,劣化后的岩石力学强度约为干燥状态下的69.19%。研究成果为理解地下工程岩体的水化力学劣化行为及指导工程稳定性评估具有重要意义。

关键词: 页岩, 水化作用, 单轴抗压强度, 有限元分析, 力学强度劣化

Abstract: In response to the insufficient understanding of rock mass hydration on mechanical strength in underground engineering,a combined approach of rock mechanics experiments and numerical simulation was used,with Longmaxi Formation shale as the study object.Uniaxial compression tests and Abaqus finite element simulations were conducted on rock samples after different soaking times to investigate the impact of hydration on shale mechanical properties and its failure mechanism.The results show that hydration weakens the shale cohesion,thereby significantly reducing its peak stress and elastic modulus.Moreover,as hydration time increases,the failure mode of the rock transitions from brittle to plastic.Meanwhile,there exists a critical point in the deterioration of shale mechanical strength under hydration:the post-deterioration mechanical strength is about 69.19% of that in dry conditions.The findings are of great significance for understanding the hydration-induced mechanical deterioration behavior of underground engineering rock masses and guiding stability evaluations for engineering projects.

Key words: shale, hydration, uniaxial compressive strength, finite element analysis, mechanical strength deterioration

中图分类号:

TE21

邵先宇, 王科, 王志强, 赵凌云, 李智渲, 谭永胜, 高为. 水化作用下页岩力学强度的劣化行为实验[J]. 特种油气藏, 2026, 33(2): 143-150.

SHAO Xianyu, WANG Ke, WANG Zhiqiang, ZHAO Lingyun, LI Zhixuan, TAN Yongsheng, GAO Wei. Study on the deterioration behavior of shale mechanical strength under hydration[J]. Special Oil & Gas Reservoirs, 2026, 33(2): 143-150.

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水化作用下页岩力学强度的劣化行为实验

Study on the deterioration behavior of shale mechanical strength under hydration

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