河南理工大学学报（自然科学版）2026，Vol.45Issue(4)：159-169,11.DOI:10.16186/j.cnki.1673-9787.2025030020
不同裂隙贯穿度岩体力学特性与统计损伤模型
Mechanical properties and statistical damage model of rock mass with different fracture persistence
摘要
Abstract
Objectives To investigate the deformation and failure characteristics of rock mass under the influ-ence of fracture persistence and confining pressure,triaxial compression tests were conducted on rock specimens.Methods The evolution laws of mechanical properties and mechanical behaviors of fractured rock mass were analyzed.The coupled effects of fracture-induced damage and load-induced damage,as well as the resulting macroscopic mechanical responses,were theoretically characterized.Results The re-sults show that as confining pressure increases,the peak point of the stress-strain curve shifts to the right,the post-peak softening segment declines more gently,and the plastic behavior becomes more pro-nounced.Confining pressure promotes rapid activation of defects,inducing microcracks to propagate and co-alesce around pre-existing fractures and specimen ends,ultimately leading to macroscopic rock failure.With increasing fracture persistence,tensile strains gradually transform into compressive strains,and the rock undergoes tension-shear composite failure.The tensile failure observed in stage Ⅱ is essentially the result of the combined coalescence of secondary shear cracks and tensile cracks.An expression relating the total damage of rock mass under loading to the superposition of the two damage components was estab-lished.Using statistical damage theory and the D-P criterion,a damage constitutive model for fractured rock mass was developed to describe the nonlinear effect of fracture persistence on rock damage and failure.The physical meanings of the model parameters were clarified:m represents the brittleness characteristics of the rock mass,and F₀ reflects its average strength.Both m and F₀ show a decreasing trend with increas-ing fracture persistence.The variations in these parameters,reflecting changes in ductility-brittleness and strength characteristics of the rock mass,are consistent with the experimental results,thereby validating the proposed model.Conclusions The findings provide a theoretical basis for evaluating the stability of frac-tured rock mass engineering projects.关键词
裂隙岩体/围压/变形破坏/损伤演化/本构模型Key words
fracture rock mass/confining pressure/deformation and failure/damage evolution/constitutive model分类
建筑与水利引用本文复制引用
王欣,刘小宇,郑世航,袁超..不同裂隙贯穿度岩体力学特性与统计损伤模型[J].河南理工大学学报（自然科学版）,2026,45(4):159-169,11.基金项目
国家自然科学基金资助项目(42401163) （42401163）
陕西省自然科学基金资助项目(2024JC-YBQN-0273) （2024JC-YBQN-0273）
教育部产学合作协同育人项目(2407185825) （2407185825）
