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针对取自中国高放废物地质处置首选预选区深部花岗岩中的天然开启节理,基于室内试验对其剪切性能进行了测试分析。首先开展了垂直于节理面的压应力循环加卸载测试,之后在不同压应力条件下开展了天然节理直剪试验。同时,借助三维激光扫描技术获得了剪切面精确面积,并实现了节理面粗糙度评价。测试结果表明:在对应的深部地应力条件下,天然开启节理处于压密状态,且压应力幅值的变化不会使得开启节理产生不可恢复的变形;同一条节理在室内试验尺度上的剪切性能具有一致性,不同深度处节理的剪切性能也具有相似性;节理粗糙系数(JRC)与剪切强度参数之间未发现明显的相关关系。上述研究结论以及获得的Mohr-Coulomb强度参数可以为后续现场试验和数值分析提供初步依据。
In view of the natural open joints in deep granite from the preselected preselected area for geological disposal of high level radioactive waste in China, its shear properties were tested and analyzed based on laboratory tests. First, the compressive stress cyclic loading-unloading test perpendicular to the joint plane was carried out. Then the natural joint shear test was carried out under different compressive stress conditions. At the same time, the exact area of the shear surface was obtained by 3D laser scanning technology, and the roughness of joint surface was evaluated. The test results show that under the corresponding deep in-situ stress conditions, the natural open joints are in a compact state, and the change of the compressive stress amplitude will not cause unrecoverable deformation of the open joints. The shear of the same joint in the laboratory test scale The shear properties of the joints at different depths also have similarities. There is no obvious correlation between the joint roughness parameters (JRC) and the shear strength parameters. The above conclusions of the study and the obtained Mohr-Coulomb strength parameters can provide a preliminary basis for subsequent field tests and numerical analysis.