中外公路2026，Vol.46Issue(3)：201-207,7.DOI:10.14048/j.issn.1671-2579.2026.03.022
基于闪长岩机制砂的隧道喷射混凝土配合比设计
Mix Proportion Design of Tunnel Shotcrete Based on Diorite Manufactured Sand
摘要
Abstract
Tunnel construction produces a large amount of waste slag,which cannot be effectively utilized due to various factors.By using tunnel slag to prepare manufactured sand to replace natural sand,resources can be saved;costs can be reduced,and the environment can be protected.Based on the Xi'an-Shiyan high-speed railway project,the physical and mechanical properties of diorite along the tunnel were tested;the physical properties and concrete performance of manufactured sand and natural sand were comparatively studied,and the effects of water-binder ratio and sand ratio on the performance of shotcrete were analyzed by designing multiple sets of mix proportion tests.The results indicate that diorite has few impurities,good stability,and a low radioactivity index,which is suitable for preparing manufactured sand;compared with natural sand,manufactured sand particles are characterized by rough surfaces,a high fineness modulus,and a high water demand,and meanwhile,the manufactured sand concrete has slightly poorer fluidity but higher strength;when the water-binder ratio is 0.410.43,and the sand ratio is 51%52%,the overall performance of the manufactured sand shotcrete is optimal,and the designed mix proportion shows a good application effect in field trial spraying.It is practicable to apply diorite manufactured sand in shotcrete,which can meet the engineering requirements of tunnel shotcrete,and its application in concrete materials can be further promoted in the future.关键词
机制砂/闪长岩/隧道喷射混凝土/配合比/工作性能/力学性能Key words
manufactured sand/diorite/tunnel shotcrete/mix proportion/workability/mechanical property分类
交通工程引用本文复制引用
宋福宁,王泽刚,刘乃飞,宋战平..基于闪长岩机制砂的隧道喷射混凝土配合比设计[J].中外公路,2026,46(3):201-207,7.基金项目
国家自然科学基金资助项目(编号:52178393) （编号:52178393）
西北旱区生态水利国家重点实验室(西安理工大学)开放基金资助项目(编号:2022KFKT-8) （西安理工大学）
