铁路隧道软弱围岩开挖支护施工优化技术分析

Analysis of Optimization Technology for Excavation and Support Construction of Weak Surrounding Rock in Railway Tunnels

摘要:

文章以川北某新建货运铁路隧道为研究对象,结合泥质页岩、风化砂岩及断层破碎带的地质特征,剖析原有台阶法开挖及常规支护工艺存在的不足,从开挖工法、爆破参数、超前支护、初期支护与动态监测五个维度开展系统优化,形成适配西南山区软弱围岩的成套施工方案。研究结果表明,优化后的工艺能够有效抑制围岩持续变形,提高支护结构稳定性,实现施工安全与施工效率同步改善。

Abstract:

This article takes a newly built freight railway tunnel in northern Sichuan Province as the research object. Combining the geological characteristics of mudstone shale, weathered sandstone, and fault fracture zones, the shortcomings of the original step method excavation and conventional support technology are analyzed. Systematic optimization is carried out from five dimensions: excavation method, blasting parameters, advanced support, initial support, and dynamic monitoring, forming a complete construction plan suitable for weak surrounding rock in southwestern mountainous areas. The research results indicate that the optimized process can effectively suppress the continuous deformation of the surrounding rock, improve the stability of the support structure, and achieve synchronous improvement of construction safety and efficiency.