干燥及饱水状态下基于巴西劈裂法的板岩抗拉强度

Tensile strength of slates under Brazilian splitting test in dry and saturated condition

为研究干燥及饱水状态下不同层理角度板岩的抗拉强度的相关规律,采用微机控制电液伺服万能试验机对不同层理角度的板岩试件进行巴西劈裂试验,获得其破坏荷载、饱和含水率、抗拉强度等力学参数;基于获得的力学参数分析不同状态下板岩试件抗拉强度的变化规律以及其相对应的破坏模式。研究结果表明:随着板岩试件层理角度的增加,其抗拉强度逐渐降低,饱水状态下板岩试件的抗拉强度明显低于干燥状态下板岩试件的抗拉强度,并且层理角度为0°和90°板岩试件的破坏模式为纯拉伸破坏,层理角度为30°和60°板岩试件的破坏模式为沿层面剪切破坏。

In order to study the related law of the tensile strength of slates in different bedding angles in dry and saturated condition, failure load, saturated water content, tensile strength of slates of different bedding angles were obtained by Brazilian splitting test using microcomputer control electro-hydraulic servo universal testing machine. The related laws and the failure mode of the tensile strength of slates in different bedding angles under different states were analyzed. The results show that the tensile strength of slates decreases with the increase of bedding angles of slates, the tensile strength of the slates specimen in the water-saturated state is significantly lower than that of the slates specimen in the dry state. Failure mode of slate specimens is the pure tensile failure when the bedding angles are 0° and 90°. Failure mode of slate specimens is the shear failure along the level when the bedding angles are 30° and 60°.