董卓, 王永霞, 袁瑞甫.岩石-混凝土组合体单轴压缩力学与破坏特征数值模拟研究[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787.2023070015.

DONG Z , WANG Y X, YUAN R F.Numerical study on mechanical and failure characteristics of rock-concretecombination under uniaxial compression[J].Journal of Henan Polytechnic University(Natural Science) ,doi:10.16186/j.cnki.1673-9787.2023070015.

岩石-混凝土组合体单轴压缩力学与破坏特征数值模拟研究(网络首发)

董卓, 王永霞, 袁瑞甫

河南理工大学 能源科学与工程学院，河南 焦作 454000

摘要:为研究单轴压缩条件下混凝土组分骨料含量、强度等级、占比及界面角度对岩石-混凝土组合体力学与破坏特征的影响，提出了凸多边形随机骨料生成与投放程序，并结合RFPA^2D分析系统进行数值模拟。结果表明：组合体的破坏类型可分为两大类：由混凝土组分破坏并延伸至花岗岩组分或两种组分及界面共同破坏引起的“两体I型和II型破坏”，由混凝土组分单独破坏或混凝土组分和界面共同破坏引起的“单体I型和II型破坏“，同时对界面处应力状态分析从理论上解释了沿界面宏观裂纹的形成原因；组合体抗压强度接近混凝土的单轴抗压强度，其值与混凝土组分强度等级正相关而与占比负相关。组合体弹性模量数值模拟结果与理论值吻合较好，且与骨料含量及强度等级正相关而与占比及界面倾角负相关。组合体泊松比与骨料含量及占比负相关，但强度等级对其影响较小。此外组合体抗压强度及泊松比均随界面倾角的增加呈先减小后增加的变化趋势。研究结果可为地下或坝体等工程的稳定性分析提供参考依据。

关键词:岩石-混凝土组合体;随机骨料;单轴压缩;数值模拟;力学与破坏特征

中图分类号：TU528;TU45

doi:10.16186/j.cnki.1673-9787.2023070015

基金项目:国家自然科学基金资助项目（52104084）；河南省高等学校重点科研项目计划（22A440010）；河南省高校科技创新团队支持计划资助 （22IRTSTHN005）

收稿日期:2023-07-09

修回日期:2023-09-18

网络首发日期:2023-11-30

Numerical study on mechanical and failure characteristics of rock-concretecombination under uniaxial compression（Online）

DONG Zhuo, WANG Yongxia, YUAN Ruifu

School of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， China

Abstract:To investigate the effects of aggregate content， strength grade， proportion， and interface angle of concrete components on the mechanical properties and failure characteristics of rock-concrete composites under uniaxial compression conditions， a convex polygon random aggregate generation and placement program was proposed. Numerical simulations were conducted using the RFPA^2D analysis system. The results show that the failure types of the composite can be divided into two categories， two-body type I and II failure caused by the failure of the concrete component extending to the granite component or simultaneous failure of both components and the interface， and single-body type I and II failure caused by the failure of the concrete component alone or the simultaneous failure of the concrete component and the interface. The stress state analysis at the interface provides a theoretical explanation for the formation of macro-cracks along the interface. The compressive strength of the composite is close to the uniaxial compressive strength of concrete. Its value is positively correlated with the strength grade of the concrete component and negatively correlated with the proportion. The numerical simulation results of the elastic modulus of the composite are in good agreement with the theoretical values. It is positively correlated with the aggregate content and strength grade， and negatively correlated with the proportion and interface inclination angle. The Poisson's ratio of the composite is negatively correlated with the aggregate content and proportion， but the influence of the strength grade on it is relatively small. Additionally， both the compressive strength and Poisson's ratio of the composite exhibit a decreasing-then-increasing trend with increasing interface inclination angle.The results provide a basis for the stability analysis of underground or dam

Key words:rock-concrete combination;random aggregate;uniaxial compression;numerical simulation;mechanical and failure characteristics

CLC：TU528;TU45