A thermo-chemo-mechanical cohesive zone model (CZM) is proposed to describe the shear behaviour of the interface between cemented paste backfill (CPB) and rock under the coupled effects of temperature and binder hydration. To quantitatively evaluate the thermal effect on the binder hydration, an equivalent thermal age is put forward to express the contribution of temperature to the mechanical properties. The interface shear strength properties (e.g., adhesion and friction angle) are then formulated with the equivalent thermal age. Besides, the evolution of the modes I & II fracture toughness of the CPB/rock interface cured at various thermal conditions is experimentally investigated and incorporated into the CZM. The proposed thermo-chemo-mechanical CZM is validated against the measured data from the direct shear tests on the CPB/rock specimens cured at temperatures of 2 °C, 20 °C, and 35 °C for 1, 3, 7 and 28 days. The good agreement between the predicted results and the laboratory measurements proves the satisfactory predictability of the thermo-chemo-mechanical CZM. The results of the sensitivity analysis indicate that the proposed CZM is sensitive to the variations in friction angle, adhesion and modes I & II fracture toughness.

提出了一种热-化学-机械内聚力区域模型（CZM）来描述水泥浆回填（CPB）与岩石之间的界面在温度和粘合剂水化作用的耦合作用下的剪切行为。为了定量评估对粘合剂水合的热效应，提出了等效的热老化时间来表达温度对机械性能的影响。然后以等效的热老化时间来计算界面剪切强度特性（例如，附着力和摩擦角）。此外，还对在各种热条件下固化的CPB /岩石界面的I和II型断裂韧度的演变进行了实验研究，并将其纳入CZM。拟议的热化学机械CZM已通过在2°C，20°C和35°C下固化1天，3天，7天和28天的CPB /岩石样品的直接剪切试验的测量数据进行了验证。预测结果与实验室测量值之间的良好一致性证明了热化学机械CZM的令人满意的可预测性。敏感性分析的结果表明，提出的CZM对摩擦角，附着力以及I和II型断裂韧度的变化敏感。