水利学报2026，Vol.57Issue(7)：1079-1092,14.DOI:10.3724/j.slxb.20250575
高频变幅水压下裂隙砂岩蠕变行为与劣化机理研究
Creep behavior and deterioration mechanism of fractured sandstone under high-frequency variable water pressure
摘要
Abstract
To evaluate the long-term stability of surrounding rock under high-frequency variable amplitude water pres-sure in abandoned mine roadways converted into lower reservoirs of pumped-storage hydropower stations,this study focuses on sandstone from the Haizhou open-pit mine.Step-loading creep tests were conducted using a self-developed visualization device for coupled hydraulic-stress action testing and the effects of different included angles between fractures,variation amplitude and frequency of water pressure on creep characteristics,long-term strength,and failure mechanism were systematically examined in conjunction with scanning electron microscope(SEM)analy-sis.The results show:(1)High-frequency variable water pressure significantly enhances the creep effect,with the creep curve exhibiting a"climbing"phenomenon during the steady-state stage.Greater variation amplitude or higher frequency of water pressure leads to more pronounced creep deformation.(2)Long-term strength decreases with increasing fracture angle,variation amplitude and frequency of water pressure,with the maximum reduction observed at a 90° fracture angle,1.2 MPa amplitude,and a frequency of 3 cycles/day.A quadratic polynomial relationship exists between variation frequency and long-term strength,while a linear relationship exists between variation ampli-tude and long-term strength.(3)Specimen failure primarily propagates along the fracture tips.Larger water pressure amplitude intensifies shear failure,while higher frequency shifts the failure mode toward a tensile-shear composite type and increases the degree of fragmentation.(4)SEM analysis reveals that the water-rock chemical and physical interactions,coupled with the"compression-decompression"effect induced by high-frequency water pressure,accel-erate mineral dissolution,particle migration,and irreversible crack damage,ultimately leading to strength deteriora-tion and instability.关键词
裂隙岩体/水-力耦合/蠕变变形/长期强度/劣化机理Key words
fractured rock mass/hydro-mechanical coupling/creep deformation/long-term strength/deterioration mechanism分类
建筑与水利引用本文复制引用
王乐华,宋春鹏,许晓亮,王小平,李心怡,朱斐..高频变幅水压下裂隙砂岩蠕变行为与劣化机理研究[J].水利学报,2026,57(7):1079-1092,14.基金项目
国家自然科学基金项目(52479103) （52479103）
国家自然科学基金重大科研仪器研制项目(52327811) （52327811）
