Regarding the difference between the construction process of shotcrete lining and open cut method, we must first understand the construction process of the two, and then compare them.

　　I. Construction process of shotcrete lining

　　Shotcrete lining is usually constructed using the New Austrian Tunneling Method (NATM), and its construction process mainly includes the following steps:

　　1. Excavation: Use drilling and blasting method, tunnel boring machine method or other suitable excavation methods to excavate the tunnel according to the designed section size.

　　2. Initial support: Initial support is carried out immediately after excavation, including spraying concrete, installing anchor rods and steel mesh to control the deformation of the surrounding rock and ensure construction safety.

　　3. Monitoring and feedback: By installing monitoring instruments, the deformation of the surrounding rock and support structure is continuously monitored, and the construction parameters are adjusted according to the monitoring data to ensure support safety.

　　4. Secondary lining: After the initial support is stable, the secondary lining is applied according to the geological conditions and design requirements to form a composite lining structure to enhance the overall stability and waterproof performance of the tunnel.

　　5. Waterproof layer construction: Lay a waterproof layer on the inner side of the secondary lining to prevent groundwater penetration and protect the lining structure.

　　6. Installation of auxiliary facilities: Including the installation of drainage, ventilation, lighting, monitoring and other systems to improve the tunnel function.

　　II. Open-cut construction process

　　The open-cut construction process is relatively direct, mainly including:

　　1. Ground preparation: Clear ground obstacles, carry out fencing and traffic diversion in the construction area to ensure construction safety.

　　2. Excavation: Use excavators, bulldozers and other equipment to excavate from the ground to the designed depth to form a foundation pit.

　　3. Support: During or after the excavation, support is carried out, including piling, grouting, and support installation to prevent the collapse of the foundation pit.

　　4. Waterproof layer construction: Lay a waterproof layer on the bottom and side walls of the foundation pit to prevent groundwater penetration.

　　5. Underground structure construction: Pour concrete in the foundation pit and construct the underground structure, including the bottom plate, side wall and top plate.

　　6. Backfill and restoration: After the construction of underground structure is completed, the foundation pit is backfilled and the ground is restored, including roads, greening, etc.

　　III. The main differences between shotcrete lining and open cut method in the construction process are:

　　1. Excavation and support method: shotcrete lining is supported immediately after excavation, while open cut method is supported after excavation.

　　2. Construction environment: shotcrete lining is suitable for underground excavation, while open cut method is carried out on the ground.

　　3. Construction sequence: shotcrete lining is a dynamic construction, and the construction strategy is adjusted according to the monitoring data; the open cut method has a more fixed sequence, from ground excavation to underground structure construction.

　　These differences reflect the applicable scenarios and characteristics of the two construction methods. The choice of which method should be based on the geological conditions, environmental requirements and cost-benefit analysis of the specific project.