Practice and Optimization of Shotcrete Protection Construction Technology for Highway Cutting Slopes
公路路堑边坡喷射混凝土防护施工技术实践及优化研究

摘要

山区及丘陵地区公路路堑开挖后，原有岩土体应力平衡被打破，边坡易出现风化剥落、裂隙扩张、小 型溜塌等病害，直接威胁道路运营安全。喷射混凝土凭借施工便捷、整体性强、防护效果稳定的优势，成 为路堑边坡主流防护工艺。本文依托公路路堑边坡实体工程，系统阐述喷射混凝土防护施工原理与工艺流 程，梳理坡面清理、配合比设计、分层喷射、养护管控等关键工序要点，分析回弹量大、表层开裂、厚度不 均等常见质量问题成因，针对性提出工艺优化与质控改进方案。实践表明，优化后的施工技术可有效提升边 坡防护整体性与耐久性，降低病害发生率，可为同类路堑边坡防护工程提供参考。

Abstract

After the excavation of highway cuttings in mountainous and hilly areas, the original stress balance of rock and soil masses is disturbed, and slope defects such as weathering and spalling, crack expansion, and small scale sliding collapse are likely to occur, directly threatening road operation safety. With the advantages of convenient construction, strong integrity, and stable protection performance, shotcrete has become a mainstream protection technology for cutting slopes. Based on a practical highway cutting slope project, this paper systematically expounds the construction principles and process flow of shotcrete protection, reviews key construction procedures such as slope surface cleaning, mix proportion design, layered spraying, and curing control, and analyzes the causes of common quality problems such as large rebound loss, surface cracking, and uneven thickness. Targeted process optimization and quality control improvement schemes are then proposed. Practice shows that the optimized construction technology can effectively improve the integrity and durability of slope protection, reduce the occurrence rate of defects, and provide reference for similar cutting slope protection projects.