干燥及饱水状态多孔玄武岩力学性质试验研究  

Experimental Study on Mechanical Properties of Porous Basalt in Dry and Saturated State

作　　者：沈筠 吴启一 韩云飞 许泽宁 吴林松 姚华彦[2] SHEN Yun;WU Qiyi;HAN Yunfei;XU Zening;WU Linsong;YAO Huayan(Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China;College of Civil Engineering,Hefei University of Technology,Hefei 230000,China;Anhui Conch Design&Research Institute of Building Materials Co.,Ltd.,Wuhu 241000,China)

机构地区：[1]安徽省交通控股集团有限公司,安徽合肥230088 [2]合肥工业大学土木与水利工程学院,安徽合肥230000 [3]安徽海螺建材设计研究院有限责任公司,安徽芜湖241000

出　　处：《金属矿山》2024年第5期232-236,共5页Metal Mine

基　　金：安徽省交通控股集团有限公司科技项目(编号:JKKJ-2019-05)。

摘　　要：多孔玄武岩具有典型的蜂窝气孔状构造,为了了解其工程特性,先对某多孔玄武岩的孔隙特征进行了分析,并开展了干燥与饱水两种状态下的单轴压缩、巴西劈裂和直剪试验。结果表明:多孔玄武岩存在大量大小且分布不均的孔隙,对岩石的力学性质有较大的影响。在饱水状态下,多孔玄武岩的单轴抗压和抗拉强度以及内摩擦角和黏聚力均有不同程度的降低;其破坏形式与干燥状态也有明显差异;劈裂试验软化系数低于单轴压缩试验。多孔玄武岩具有较高的孔隙率,其软化机制主要在于孔隙水压力和矿物颗粒摩擦弱化。饱水对多孔玄武岩的变形、强度以及破坏特征有明显的影响。The porous basalt has typical honeycomb pore structure.In order to study its engineering characteristics,the pore characteristics of porous basalt are firstly analyzed in this paper,and uniaxial compressive test,Brazilian splitting test and direct shear test are carried out under dry and saturated conditions.The results show that the porous basalt has a large number of unevenly distributed pores,which have a great influence on the mechanical properties of the rock.The uniaxial compressive and tensile strength,angle of internal friction and cohesive force of porous basalt all decrease in different degrees under saturated condition.The destruction form is also obviously different from the dry state.The softening coefficient of splitting test is lower than that of uniaxial compressive test.Porous basalt has high porosity,and its softening mechanism mainly lies in the weakening of pore water pressure and friction of mineral particles.The saturated state has obvious influence on the deformation,strength and failure characteristics of porous basalt.

关 键 词：多孔玄武岩 CT 扫描 单轴压缩试验 巴西劈裂试验 直剪试验 

分 类 号：TU45[建筑科学—岩土工程]