基于近场动力学方法的岩石十字裂纹破坏分析  

Rock cross crack destruction analysis based on peridynamic theory

作　　者：郑立静 宁晓骏[1] 刘国坤 彭一 ZHENG Lijing;NING Xiaojun;LIU Guokun;PENG Yi(School of Architectural Engineering,Kunming University of Science and Technology,Kunming 650500,China;School of Architectural Engineering,Hunan Institute of Engineering,Xiangtan 411104,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500 [2]湖南工程学院建筑工程学院,湖南湘潭411104

出　　处：《四川建筑科学研究》2024年第4期63-70,共8页Sichuan Building Science

基　　金：湖南省教育厅项目(22B0737)。

摘　　要：采用单键双参数键型近场动力学方法对岩石十字裂纹破坏过程进行了模拟。相较于传统的键型近场动力学,考虑了物质点对间法向及切向的移动情况,以此来突破泊松比的限制,同时为避免施加荷载时位移产生突变而引入了线性加载算法,并建立了能准确描述岩石破坏的近场动力学模型,进而模拟了岩石的十字正交裂纹的起裂及裂纹成核的过程。本次模拟将轴向压缩下的含不同位置与不同倾斜角的初始十字裂纹试件的裂纹扩展路径与试验结果进行了对比分析,研究了裂纹的中心点间距、裂纹的倾斜角等因素对裂纹的起裂及裂纹扩展路径的影响。通过对比发现,模拟结果与试验结果吻合性良好。This article used the single bond dual parameter bond type peridynamic method to simulate the process of rock cross crack failure.Compared to traditional bond type peridynamic,this article considered the normal and radial movement of material point pairs,breaking through the limitations of Poisson’s ratio,and introduced a linear loading algorithm to avoid sudden changes in displacement when applying loads.A peridynamic model that could accurately describe rock failure was established,thereby simulating the initiation and nucleation process of cross orthogonal cracks in rocks.This experiment compared and analyzed the crack propagation path of initial cross crack specimens with different positions and inclination angles under axial compression with experimental results.The effects of factors such as crack center spacing and crack inclination angle on crack initiation and propagation were studied,and the simulation results were in good agreement with the experimental results.

关 键 词：岩石破坏 裂纹扩展 近场动力学 线性加载 数值模拟 十字正交裂纹 

分 类 号：TU45[建筑科学—岩土工程]