为解决山岭隧道施工现场岩碴大量堆积，造成资源浪费、环境破坏等问题，以西南地区某高原隧道工程为依托，研究岩碴部分替代喷射混凝土中粗骨料的可行性和实用性。基于确定的基准试验组喷射混凝土的配合比，通过唯一变量原则，开展喷射混凝土中粗骨料岩碴替代率分别为10%、15%、20%、25%、30%、35%的室内试验，主要包括喷射混凝土的坍落度、黏聚性、保水性、抗压强度、抗折强度等室内试验。另外，在依托工程现场开展不同岩碴替代率的混凝土试喷工作和实体强度的大板试验。基于室内及现场试验结果，得到喷射混凝土中粗骨料的岩碴最大替代率应控制在30%以下，现场试验段隧道拱顶和边墙的喷射混凝土回弹率均满足规范要求；通过大板试验，进一步验证了岩碴对粗骨料的最大替代率应控制在30%以下的使用要求。

The accumulation of rock debris produced by mountain tunnel construction always causes resource waste and environmental damage. Therefore, the feasibility and practicality of partially replacing coarse aggregates in shotcrete by rock debris are examined based on a plateau tunnel project in the southwest China. Based on the determined benchmark experimental group of shotcrete mix proportions, indoor tests are conducted on the replacement rates of coarse aggregate by rock debris in shotcrete, 10%, 15%, 20%, 25%, 30%, and 35%, respectively, using the principle of unique variables. The tests include the slump, cohesion, water retention, compressive strength, flexural strength, etc. of shotcrete. Additionally, concrete spraying tests with different rock debris replacement rates and large plate tests of solid strength are conducted in the construction site. The indoor and onsite test results show that replacement rate of rock debris for coarse aggregates in shotcrete is better be controlled within 30%, which can guarantee the rebound rate of shotcrete in the tunnel arch and sidewalls. The large plate test further validates the recommended replacement rate.