软弱围岩隧道悬臂掘进机铣挖法开挖参数优化研究

Research on Optimization of Construction Parameters of Milling Method of Cantilever Tunnel Boring Machine in Soft Rock Tunnel

摘要: 悬臂式掘进机在隧道施工中应用越来越广泛，尤其在变形、爆破扰动控制严格的隧道工程中优势明显。目前有关悬臂式掘进机破岩机理、截割效率以及地质适应性等方面的研究成果较为丰富，但在悬臂掘进机铣挖隧道的开挖参数优化方面，研究相对较少，相关成果也不成体系。论文以某公路隧道涉铁段为工程背景，开展了铣挖施工参数优化数值仿真分析和现场监测试验研究。根据数值仿真和现场实测结果，建议该公路隧道涉铁段V级围岩铣挖施工过程中上台阶长度采用24 m、下台阶长度采用24 m，开挖进尺控制在2 m以内，台阶高度无量纲比为10 (上台阶)：5 (下台阶)：4.2 (仰拱)。

Abstract: The cantilever type roadheader is increasingly utilized in tunnel construction, particularly in projects requiring strict control of deformation and blasting disturbances. While extensive research has addressed its rock-breaking mechanisms, cutting efficiency, and geological adaptability, systematic studies on the optimization of excavation parameters remain limited. This study conducts numerical simulations and on-site monitoring to optimize milling construction parameters for the highway tunnel, which intersects with a railway. Findings recommend a milling configuration with an upper step length of 24 m, a lower step length of 24 m, controlled excavation footage of 2 m, and a dimensionless step height ratio of 10:5:4.2 (upper step: lower step: elevation arch).