With the development of national infrastructure, the use of concrete has been increasing sharply, which leads to excessive exploitation of natural sand.It would result in serious damage of the environment.Re-garding sustainable development of the concrete industry, there is an inevitable trend of using the artificial sand correctly to replace river sand.In view of the erosive environment of tunnel lining concrete in Yunnan Province and the study of making C40 concrete,under the same conditions of the gelled material dosage, water-blinder ra-tio and sand ratio, the concrete is mixed with 0%、15%、25%、35%、45% and 55% of manufactured sand in place of natural river sand, respectively to investigate variation rules of working performance and mechanical function of tunnel lining concrete with diverse substitute rate.The result shows that the best substitute rate of manufactured sand is about 35%, with which the working performance and mechanical function of the concrete works well.%随着混凝土用量急速增长，必将引起天然砂的过量开采，对自然环境造成破坏，如何正确使用机制砂替代河砂成为混凝土行业可持续发展的必然趋势。针对云南地区隧道二衬混凝土处于侵蚀环境特点，以拟配 C40混凝土为研究对象，在胶凝材用量、水胶比、砂率均相同的条件下，分别掺入0％、15％、25％、35％、45％和55％的机制砂等量替代天然砂，研究不同的机制砂替代率下混凝土的工作性能和力学性能的变化规律，从而找到适用于隧道二衬混凝土的机制砂最佳替代率为35％左右，在该掺量下混凝土的工作和力学性能均有好的发挥。
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