含软弱夹层岩石自然结构面剪切破坏机理与强度模型研究

岩质边坡的安全对滑坡灾害防治、川藏铁路以及“一带一路”都具有重要的实际意义；岩质边坡的失稳滑移往往与软弱结构面有关，而结构面的粗糙度及其充填状态是影响其力学性质的关键因素。本项目以天然硬性岩石结构面为研究对象，首先拟借助3D扫描、3D雕刻和弹性波CT技术制作一系列与工程岩体同岩性的平滑结构面、锯齿结构面以及粗糙结构面试样；然后结合声发射监测技术，分析结构面在不同粗糙度与充填度复合作用下的剪切行为，阐明粗糙度对结构面剪切强度的贡献度及其演化规律，进而基于断裂力学与摩擦学原理揭示粗糙度与充填度复合作用下结构面的剪切机理，并确定粗糙度和充填度的定量关系；最后提出能够度量含不同粗糙度硬性充填结构面的剪切强度模型。该项目研究对理解充填夹层与粗糙度双重因素作用下岩质边坡的失稳过程与机理、评估其稳定性具有重要的理论意义和工程价值。

The safety of rock slopes is important for the prevention and control of landslide disasters, especially Sichuan-Tibet Railway and the Belt and Road. Unstable sliding of rock slope are often induced by the weak structural plane, of which the roughness and filling state are the key factors. In this project, natural hard rock discontinuity will be taken as the research object. Firstly, a series of samples with smooth discontinuity, sawtooth discontinuity and rough discontinuities specimens will be prepared using 3D scanning, 3D engraving and elastic wave CT technology. The lithology of specimens is the same as the engineering rock mass. Then, combined with the acoustic emission monitoring technology, the shearing behavior of the discontinuities under different roughness and filling degree will be analyzed. The contribution degree of roughness to the shear strength and its evolution raw will be clarified. Furthermore, based on the principle of fracture mechanics and tribology, the shearing mechanism under the coupling effect of roughness and filling degree will be revealed, and the quantitative relationship between roughness and filling degree will be determined. Finally, a strength model will be established to evaluate the shear strength of filling discontinuities with different roughness. The project has theoretical and engineering value for understanding the process and mechanism of instability of rock slope, as well as for evaluating stability of rock slope with filling interlayer.