基于PFC^(2D)的不同倾角组合孔洞岩石力学特性及破坏特征  

Mechanical properties and failure characteristics of combined hole rocks with different dip angles based on PFC^(2D)

作　　者：王宇驰 杨勇 张忠政 胡军[2] 夏治国 杨斌 WANG Yu-chi;YANG Yong;ZHANG Zhong-zheng;HU Jun;XIA Zhi-guo;YANG Bin(Open-pit Mining Branch,Gongchangling Mining Corporation of Ansteel Mining Co.Ltd.,Liaoyang 111000,China;School of Civil Engineering,University of Science and Technology LiaoNing,Anshan 114051,China;School of Mining Engineering,University of Science and Technology LiaoNing,Anshan 114051,China)

机构地区：[1]鞍钢集团矿业弓长岭有限公司露采分公司,辽阳111000 [2]辽宁科技大学土木工程学院,辽宁鞍山114051 [3]辽宁科技大学矿业工程学院,辽宁鞍山114051

出　　处：《矿冶》2022年第3期132-139,共8页Mining And Metallurgy

基　　金：辽宁省教育厅重点项目(2017LNZ003)。

摘　　要：天然岩体中存在不同几何形状的裂隙和孔洞缺陷,这些孔洞缺陷改变了岩体的力学特性,是引起围岩失稳的关键因素。对组合孔洞缺陷模型进行研究,有助于围岩的稳定性控制。采用二维颗粒流(PFC^(2D))软件对不同倾角组合孔洞缺陷的岩石进行单轴压缩试验,研究这些缺陷对岩石力学特性和破坏特征的影响。结果表明:孔洞缺陷的存在降低了岩石的单轴抗压强度、峰值应变、起裂应力和损伤应力,加速了裂纹的产生,促进了岩石的破坏;不同倾角对试样力学性能和损伤程度的影响不同,随着倾角的增大基本呈先降低后升高的趋势;裂纹产生前,各模型的拉应力集中区分布在孔洞的上、下端部,压应力集中区分布在孔洞的左右两侧;模型破坏后,压应力集中区域沿孔洞的左右端部转移至模型的左右两侧。There are fissures and hole defects with different geometric shapes in natural rock mass.These hole defects change the mechanical properties of the rock mass and are the key factors that cause the instability of the surrounding rock.The research on the coupling hole defect model is helpful for the stability control of surrounding rock.Two-dimensional particle flow(PFC^(2D))software was used to carry out uniaxial compression tests on rocks with different inclination angles combined with void defects to study the effects of these defects on rock mechanical properties and failure characteristics.The results show that the existence of void defects reduces the uniaxial compressive strength,peak strain,crack initiation stress and damage stress of the rock mass,accelerates the generation of cracks,and promotes the damage of the rock;Different inclination angles have different effects on the mechanical properties and damage degree of the samples,and with the increase of inclination angle,it basically shows a trend of first decreasing and then increasing;Before the crack occurs,the tensile stress concentration area of each model is distributed on the upper and lower ends of the hole,and the compressive stress concentration area is distributed on the left and right sides of the hole;After the model is damaged,the compressive stress concentration area is transferred to the left and right sides of the model along the left and right ends of the hole.

关 键 词：PFC^(2D) 组合孔洞缺陷 倾角 岩石力学特性 破坏特征 

分 类 号：TU45[建筑科学—岩土工程]