Work

Optimization of the shotcrete spraying process in blast-based tunnel construction: Insights for enhancing spraying quality

Year: 2025

Type: article

Abstract: Shotcrete is important to form the primary lining of blast-based tunnel construction , but this process heavily relies on operator expertise. Therefore, this research investigates the following research question: How to effectively model and optimize the shotcrete spraying process to construct high-quality primary linings? This paper proposes a spraying process optimization method, comprising three key components: (1) a spraying trajectories parameterization model; (2) a dynamic spraying deposition model; and (3) a spraying process parameter optimization algorithm. Validation through a railway tunnel case study demonstrates the method's effectiveness, yielding optimal spraying parameters with a mean absolute error of 0.6 cm against a target thickness of 19.4 cm. These findings provide actionable solutions for the spraying process, and reduce reliance on expertise. Future research directions can focus on integrating advanced material characterization into the spraying deposition model and developing intelligent sprayers for precise spraying parameter implementation

Source: Automation in Construction

DOI: 10.1016/j.autcon.2025.106234

Authors: Fenghua Liu, Jiajing Liu, Botao Zhong, Jun Sun

Institutions: Hunan University, Huazhong University of Science and Technology

Language: English

Topic: Tunneling and Rock Mechanics

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: hybrid

Estimated APC paid: $5,490