含两组叠置X型裂隙类岩石材料单轴拉伸破坏特征

发布时间：2018-04-02 08:57

本文选题：类岩石材料　切入点：X型裂隙　出处：《煤炭学报》2017年08期

【摘要】：含裂隙岩石/类岩石试件在单轴压缩下的破坏特征已有较多研究,但对含X型裂隙试件单轴拉伸下的破坏特征尚无研究结论。对含两组叠置X型裂隙类岩石材料试件进行了单轴拉伸试验,并与对应试件单轴压缩情况的已有实验结果进行了对比,研究了含两组叠置X型裂隙类岩石试件单轴拉伸下的岩桥贯通行为及强度特征。研究结果表明:含两组叠置X型裂隙类岩石材料试件在单轴拉、压作用下的破坏模式及岩桥贯通模式表现不同,在单轴拉伸作用下含两组叠置X型裂隙类岩石试件岩桥处不会出现贯通现象;含两组叠置X型裂隙类岩石材料试件的次裂隙位置影响试件单轴拉伸强度,在主裂隙位置固定情况下,次裂隙角度与最大拉应力方向垂直时试件强度最低,次裂隙角度与最大拉应力方向相同时试件强度最高。
[Abstract]:The failure characteristics of fractured rock / rock specimens under uniaxial compression have been studied, but there is no conclusion on the failure characteristics of specimens with X-type fractures under uniaxial tension.Uniaxial tensile tests were carried out on the specimens containing two groups of superimposed X type fractured rock materials, and the results were compared with the existing experimental results of uniaxial compression of the specimens.The bridging behavior and strength characteristics of rock bridges under uniaxial tension with two sets of superimposed X-type fractured rock specimens are studied.The results show that the failure modes and the rock bridge connecting modes of the specimens containing two groups of X type fractured rock materials under uniaxial tension and compression are different.Under the action of uniaxial tension, two groups of overlaid X type fractured rock specimens will not appear through the rock bridge, and the secondary fracture position of the specimen containing two groups of superimposed X type fractured rock materials will affect the uniaxial tensile strength of the specimen.When the main fracture position is fixed, the strength of the specimen is the lowest when the secondary fracture angle is perpendicular to the direction of the maximum tensile stress, and the strength of the specimen is the highest when the angle of the secondary crack is the same as the direction of the maximum tensile stress.
【作者单位】：山东大学土建与水利学院;山东大学岩土与结构工程研究中心;山东城市建设职业学院工程管理系;
【基金】：国家自然科学基金面上资助项目(51379114,41672281);国家自然科学基金青年基金资助项目(51509146)
【分类号】：TU45

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