中国地质灾害与防治学报2026，Vol.37Issue(4)：173-184,12.DOI:10.16031/j.cghc.202510003
孔裂隙组合缺陷砂岩蠕变破坏试验研究
Experimental investigation of creep failure behavior of sandstone with combined pore-fissure defects
摘要
Abstract
Internal defects is a primary intrinsic factor governing the deformation and failure of rocks under load.To elucidate the effects of pore-fissure combined defects on the creep behavior of rocks,a series of step-loading creep tests were conducted,with particular emphasis on the effects of pore location and diameter on creep evolution.The fracture process was monitored using acoustic emission(AE)and digital image correlation(DIC)techniques.The results show that:(1)pore position significantly affects creep duration,which is shortest when the pore is located at z position;creep duration varies in a"V-shaped"trend with increasing pore diameter.(2)the long-term strength generally decreases with larger pore diameters,reaching its minimum at the z position with a 3 mm diameter pore.During creep,the cumulative AE ringing exhibits a stepwise increase and undergoes an abrupt surge immediately before failure.(3)in the failure stage,the AE b-value transitions from fluctuating to a sustained decline,serving as a clear precursor to instability.(4)Pore spatial position exerts a dominant control over the macroscopic fracture pattern,whereas pore size primarily induces local variations.However,when the pore diameter reaches 4 mm,semi-enveloping crack propagation around the pore is observed.These findings demonstrate that pore position and size jointly control the temporal evolution of creep failure,long-term strength degradation,and crack propagation patterns.The results provide important experimental evidence for long-term strength prediction,failure mode analysis,and instability precursor identification in defect-containing rock masses.关键词
组合缺陷/声发射特征/蠕变/DIC特征/裂纹扩展Key words
combined defects/acoustic emission characteristics/creep/DIC characteristics/crack propagation分类
天文与地球科学引用本文复制引用
赵娜,温宇,王来贵..孔裂隙组合缺陷砂岩蠕变破坏试验研究[J].中国地质灾害与防治学报,2026,37(4):173-184,12.基金项目
国家重点研发计划项目(2017YFC1503101) （2017YFC1503101）
辽宁省教育厅资助项目(LJ2020JCL013) （LJ2020JCL013）
辽宁省教育厅基本科研项目(LJ212510147044) （LJ212510147044）
