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针对南京红山窑水利枢纽工程中原状膨胀红砂岩,采用RMT—150B多功能刚性岩石伺服试验机,对不同吸水率状态下的红砂岩圆柱体试件进行常规直接剪切试验,试验结果表明:膨胀红砂岩的抗剪强度与吸水率密切相关,随着吸水率的增加,粘聚力和内摩擦角都明显降低。膨胀红砂岩的吸水率对粘聚力的影响比对内摩擦角的影响要大的多,而且吸水率的变化幅度越大影响越明显。
Aiming at the Hongxingya water conservancy project in Nanjing, the RHK-150B multi-functional rigid rock servo tester was used to perform conventional direct shear tests on red sandstone cylindrical specimens under different water absorption conditions. The test results show that: The shear strength of expansive red sandstone is closely related to water absorption. With the increase of water absorption, the cohesion and internal friction angles are significantly reduced. The effect of the water absorption rate of the expansive red sandstone on the cohesion force is much greater than that of the internal friction angle, and the greater the change in the water absorption rate, the more obvious the effect is.