Harmach Walid

Structural Stability Analysis of the A13 North Tunnel – Grand Paris Express Project Context: Study on the stability of the A13 North Tunnel, located on the route of the tunnel boring machine for Line 15 West. The tunnel presents specific challenges due to its construction in unreinforced concrete and masonry, as well as the complex geology of the Saint-Cloud hill. Mission Objective: Validate the stability of the highway tunnel during the passage of the tunnel boring machine to ensure the safety and longevity of the infrastructure. Methodological Approach: Documentary Research: Compilation of an exhaustive bibliography to determine the geometric and mechanical characteristics of the A13 North Tunnel. Modeling with DIANA FEA: Application of finite element software to model the current state of the tunnel and extract existing stresses. Evaluation of Future Stresses: Use of Robot Structural Analysis to simulate the effect of the settlement trough generated by the passage of the tunnel boring machine, allowing for the evaluation of induced stresses. Results Obtained: Confirmation of the structural stability of the tunnel, with projected stresses remaining below the admissible thresholds defined by current standards. Related Projects:

- 50th Anniversary Concert of Terminal 1 at Charles de Gaulle Airport (CDG): Production of stability calculation notes and roof reinforcement to host a concert. Ancillary structure for Line 15: Production of internal and secondary structure calculation notes.

- Development of a specific approach for the study of old and fragile masonry structures, offering solutions for projects with limited data.

Collaborated as an assistant site manager, involving budget management, drafting the Specific Safety and Health Protection Plan (PPSPS), and evaluating the work to be carried out. Contributed as a study assistant by estimating and measuring projects in the study phase, in addition to managing supplier and subcontractor consultations. Actively used Mensura and AutoCAD software to facilitate these tasks. Integrated into a Civil Engineering and Utilities (VRD) team for the creation of a logistics center.

Integrated into a Civil Engineering and Utilities (VRD) team for the expansion of the Moléon E.Leclerc shopping center in Langon (Gironde).