A modified push-out method was used to explore the bond characteristics of the mortar–rock interface in an anchor system at different loading rates. Under a high loading rate (≥ 1·12 × 10⁻⁴ s⁻¹), stick–slip behaviour, which is usually used to describe the mechanism of earthquakes, was observed at the mortar–rock interface for the first time in this experimental research. The test results showed that the load–displacement curve under a high loading rate included four stages: elastic deformation, interface softening, residual friction and stick–slip oscillation. A micro-mechanical model of bond–slip at the mortar–rock interface was also developed. A series derivation revealed the relationships among the dilatancy stress of the mortar–rock interface, the loading rate and the stress drop of stick–slip. The mechanism of stick–slip behaviour at the mortar–rock interface was theoretically established. The modified visco-elastoplastic constitutive model established to describe the stick–slip characteristics of a mortar–rock interface was verified with experimental results using Abaqus software.

中文翻译：

---

高加载速率下砂浆-岩石界面的粘滑特性

修改后的推出方法用于研究锚固系统中不同荷载速率下砂浆-岩石界面的粘结特性。高负荷率（≥1·12×10 ^-4  s ^-1），本实验研究首次在砂浆-岩石界面观察到粘滑特性，通常用于描述地震的机理。试验结果表明，高载荷率下的载荷-位移曲线包括四个阶段：弹性变形，界面软化，残余摩擦和粘滑振动。还建立了砂浆-岩石界面粘结-滑移的微观力学模型。一系列推导揭示了砂浆-岩石界面的剪胀应力，荷载率和粘滑的应力降之间的关系。理论上建立了砂浆-岩石界面处粘滑行为的机理。