摘要
岩体表面施工时会形成可观的随机不规则节理界面,而界面又是影响岩石—混凝土组合体稳定的关键。基于水平光滑界面的花岗岩—混凝土组合体材料单轴压缩试验,采用颗粒离散元程序PFC2D进行建模与参数标定,考虑不同节理倾角与高宽比的矩形节理界面,利用正交设计方法,开展不规则矩形节理对花岗岩—混凝土组合体轴压力学行为的细观模拟研究。结果表明:随着节理倾角的增加,组合体峰值应力与弹性模量呈现出“V”字的变化趋势,节理倾角的增加对应力—应变曲线有着显著的影响,而角度一定时高宽比的增加会改变同角度时的峰值应力与应变;节理倾角的增加会改变裂隙的数量与分布区域,组合体的最终破坏模式也随着倾角的改变从压缩破坏逐渐转变为剪切滑移破坏,且贯通主裂隙集中在矩形节理的角点处,沿角点处向外扩展导致模型的最终破坏;建立了考虑高宽比、节理倾角的本构方程。
Considerable random and irregular joint interfaces are formed during the construction of rock mass surface,which is the key to the stability of rock-concrete composite.In this paper,based on uniaxial compression test of granite-concrete composite materials with horizontal smooth interface,the particle discrete element program PFC2D is used to model and calibration parameters.Considering the rectangular joint interface with different joint inclination angle and aspect ratio,the orthogonal design method is used to conduct a mesoscale simulation study on the axial pressure behavior of granite-concrete composite with irregular rectangular joints.The results show that with the increase of joint inclination angle,the peak stress and elastic modulus of the assembly show a"V"trend,and the increase of joint inclination angle has a significant influence on the stress-strain curve,while the increase of aspect ratio will change the peak stress and strain at the same joint inclination angle.The increase of joint inclination angle will change the number and distribution area of cracks,and the final failure mode of the assembly will gradually change from compression failure to shear-slip failure with the change of inclination angle.Moreover,the through main fracture is concentrated at the corner of the rectangular joint,and the expansion along the corner point leads to the final failure of the model.At the same time,a constitutive equation considering the aspect ratio and joint inclination angle is established.
作者
李庆文
钟宇奇
潘创创
聂帆帆
李玲
李涵静
刘艺伟
LI Qingwen;ZHONG Yuqi;PAN Chuangchuang;NIE Fanfan;LI Ling;LI Hanjing;LIU Yiwei(School of Civil and Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,China)
出处
《金属矿山》
CAS
北大核心
2024年第8期19-28,共10页
Metal Mine
基金
辽宁省自然科学基金面上项目(编号:2023-MS-298)
辽宁省教育厅高校基本科研面上项目(编号:JYTMS20230866)
辽宁省博士科研启动基金项目(编号:2019-BS-120)。
关键词
矩形节理界面
花岗岩—混凝土组合体
轴压力学行为
颗粒离散元
rectangular joint interface
granite-concrete composite
axial compressive behavior
particle discrete element
