For concrete buildings, the tasks of maintenance and reconstruction will rapidly increase with time, and concrete breaking is one of the important technical processes. In this study, it proposed the water jet combined with mechanical cutter head breaking concrete technology, which has advantages in efficiency, safety and quality compared with mechanical breaking concrete buildings. To reveal parameter influence rules and damage mechanism of water jet combined with mechanical cutter head breaking concrete, it investigated the experiment of water jet combined with mechanical cutter head breaking concrete under different water jet parameters by orthogonal experiment and numerical simulation. Within the range of water jet parameters studied in this experiment, the order of sensitive factors of water jet parameters is the diameter of the nozzle > the impact time > the water pressure > the jet target distance. Compared with the mechanical breaking methods, the working pressure of the mechanical cutter head can reduce by 10.00%–36.67% in water jet combined with mechanical cutter head. The optimal water jet parameter combination is the 360 MPa of water pressure, the 6 mm of jet target distance, the 80 s of impact time, and the 0.5 mm of diameter of the nozzle. Moreover, based on the smooth particle hydrodynamics (SPH) method, it established the numerical model of water jet combined with mechanical cutter head breaking concrete, verified by the crack propagation state inside the concrete based on computer tomography (CT). The results demonstrated that at the initial stage of water jet impacting concrete, compressive stress and shear stress caused craters formation; at the stage of continuous impact of water jet, cracks formation in concrete was mainly caused by tensile stress; at the initial stage of mechanical cutter head pressing concrete, concrete was mainly subjected to compressive stress and shear stress resulting in craters development; at the stage of mechanical cutter head penetrating concrete, cracks development was mainly caused by compressive stress and shear stress. The results can provide theoretical supports for the water jet combined with mechanical cutter head breaking concrete buildings.

对于混凝土建筑而言，维护和改造的任务会随着时间的推移而迅速增加，而混凝土破碎是重要的技术工序之一。本研究提出了水射流结合机械刀盘破碎混凝土技术，与机械破碎混凝土建筑相比，在效率、安全和质量方面具有优势。为揭示水射流结合机械刀盘破碎混凝土的参数影响规律和破坏机理，通过正交试验和数值模拟研究了不同水射流参数下的水射流结合机械刀盘破碎混凝土试验。在本实验研究的水射流参数范围内，水射流参数敏感因素的顺序是喷嘴直径> 冲击时间 > 水压 > 射流目标距离。与机械破碎法相比，水射流结合机械刀盘可降低机械刀盘工作压力10.00%~36.67%。最佳水射流参数组合为360 MPa的水压、6 mm的射流目标距离、80 s的冲击时间和0.5 mm的喷嘴直径。此外，基于 喷嘴直径为 5 mm。此外，基于 喷嘴直径为 5 mm。此外，基于光滑粒子流体动力学（SPH）方法，建立水射流结合机械刀头破碎混凝土的数值模型，并通过计算机断层扫描混凝土内部裂缝扩展状态进行验证(CT)。结果表明，在水射流冲击混凝土的初始阶段，压应力和剪应力导致了弹坑的形成；在水射流连续冲击阶段，混凝土裂缝的形成主要是由拉应力引起的；机械刀盘压制混凝土初期，混凝土主要承受压应力和剪应力，形成弹坑；在机械刀头穿透混凝土阶段，裂缝的发展主要是由压应力和剪应力引起的。研究结果可为水射流结合机械刀盘破碎混凝土建筑物提供理论支持。