深部花岗岩中天然开启节理剪切性能试验研究

发布时间：2018-06-02 08:36

本文选题：天然开启节理 + 剪切强度　；参考：《地下空间与工程学报》2017年01期

【摘要】：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。
[Abstract]:Aiming at the natural open joints in the deep granite from the preferred geological disposal area of high-level radioactive waste in China, the shear properties of the granite were tested and analyzed based on laboratory tests. The cyclic loading and unloading tests of compressive stress perpendicular to the joint surface were carried out first, and then the direct shear tests of natural joints were carried out under different compressive stress conditions. At the same time, the accurate area of shear surface is obtained by using 3D laser scanning technique, and the roughness evaluation of joint surface is realized. The test results show that the natural open joint is in a compacted state under the corresponding deep ground stress condition, and the change of the compressive stress amplitude will not cause the unrecoverable deformation of the opening joint. The shear properties of the same joint on the scale of laboratory tests are consistent, and the shear properties of joints at different depths are similar, and there is no obvious correlation between the joint roughness coefficient (JRC) and the shear strength parameters. The above conclusions and the obtained Mohr-Coulomb strength parameters can provide a preliminary basis for subsequent field tests and numerical analysis.
【作者单位】：核工业北京地质研究院环境工程研究所;核工业北京地质研究院中核集团高放废物地质处置评价技术重点实验室;四川大学水利水电学院;中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家自然科学基金(11402079)
【分类号】：TU45

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