Optimization of surrounding rock stability and support scheme for complex terrain highway tunnels in northwest Yunnan
滇西北复杂地形公路隧道围岩稳定性及支护方案优化

摘要

本文立足滇西北高山峡谷复杂地形与特殊地质工况，系统剖析区域公路隧道围岩失稳的核心机理与现有支护体系 的突出问题，结合区域典型隧道工程施工实践，从围岩动态监测、分级稳定性评价、差异化支护设计、施工工艺优化、 全过程动态管控等维度，提出一套适配滇西北复杂地质、可落地、可闭环、可推广的围岩稳控与支护方案优化策略。 研究成果可有效解决滇西北隧道软岩大变形、偏压失稳、支护失效等行业痛点，提升围岩整体稳定性与支护结构耐久 性，为区域同类山区公路隧道工程安全施工、质量提质、风险防控提供实操技术支撑与管理参考。

Abstract

Based on the complex terrain of high mountains and valleys and unique geological conditions in northwestern Yunnan, this paper systematically analyzes the core mechanisms underlying rock mass instability in regional highway tunnels and identifies critical issues with existing support systems. Drawing on practical experiences from typical tunnel projects in the region, it proposes a comprehensive strategy for rock mass stability control and support system optimization that addresses the region's challenging geological conditions—being implementable, closed-loop, and scalable. The approach encompasses dynamic monitoring of surrounding rock, graded stability assessment, tailored support design, construction process optimization, and full-process dynamic management. These findings effectively address industry challenges such as significant deformation in soft rock, lateral pressure-induced instability, and support failure in northwestern Yunnan tunnels, enhance overall rock mass stability and support structure durability, and provide actionable technical guidance and management references for safe construction, quality improvement, and risk mitigation in similar mountainous highway tunnel projects.