基于DEM的孔洞数量对多孔类岩石材料拉剪力学特征的影响  

Influence of Pore Number on the Tensile and Shear Mechanical Characteristics of Porous Rock-like Materials via the DEM

作　　者：赵铁永 方传峰 吴根水 刘迅[2,3] 胡晨晖 ZHAO Tieyong;FANG Chuanfeng;WU Genshui;LIU Xun;HU Chenhui(Tongchuang Engineering Design Co.Ltd.,Shaoxing 312000,Zhejiang,China;School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China;Sanya Research Institute,Hunan University of Science and Technology,Sanya 572024,Hainan,China)

机构地区：[1]同创工程设计有限公司,浙江绍兴312000 [2]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [3]湖南科技大学三亚研究院,海南三亚572024

出　　处：《科技和产业》2025年第6期24-29,共6页Science Technology and Industry

基　　金：湖南省自然科学基金(2024JJ6219);湖南科技大学科研启动基金(E523C7);湖南省教育厅科学研究优秀青年项目(24B0441)。

摘　　要：多孔类岩石材料的拉剪力学特性影响工程的安全性与稳定性。构建含不同孔洞数量的数值模型,通过DEM法开展直接拉伸与直剪试验的数值模拟,探究孔洞数量对材料拉剪力学特征的影响。结果表明,随孔洞数量增加,抗拉强度、压拉强度比、凝聚力和内摩擦角以不同形式下降。另外,拉伸作用下裂隙主要沿水平方向生成且不受孔洞数量影响,剪切作用下裂隙主要沿与水平方向一定角度生成,孔洞数量增加主要导致剪切作用下裂隙产状的各向异性下降。The tensile and shear properties of porous rock-like materials affect the safety and stability of engineering.In this paper,numerical models with different number of pores were constructed,and the numerical simulation of direct tensile and direct shear tests were carried out by the DEM to explore the influence of the pore number on the tensile and shear characteristics of materials.The results show that the tensile strength,the ratio of compressive strength to tensile strength,cohesion and internal friction angle decrease in different forms with the increase of the pore number.In addition,under tensile action,cracks are mainly formed along the horizontal direction and are not affected by the number of pores.Under shear action,cracks are mainly formed along a certain Angle with the horizontal direction.The increase of the pore number mainly leads to the decrease of the anisotropy of fracture occurrence under shear action.

关 键 词：离散元数值模拟 孔洞数量 多孔类岩石材料 拉剪力学特性 

分 类 号：TU452[建筑科学—岩土工程]