The application of permeable mortar in tunnel engineering aims to solve the drainage problem inside the tunnel and improve the safety and durability of the tunnel. Adding fiber is one of the effective means to improve the water permeability,compressive strength and pore structure of mortar. Based on this,taking paper fiber as the research object,the influence of paper fiber on the performance of permeable mortar is briefly discussed. The paper fiber was mixed into the cement mortar under alkaline condition,and the water permeability,compressive strength and pore structure of the mortar test block modified by the paper fiber were tested and analyzed. The results show that the water absorption of mortar test block increases gradually with the increase of paper fiber content,and can reach 2～3 times of that of ordinary mortar test block. The addition of paper fiber will reduce the compressive strength of mortar test block,and the higher the content,the lower the compressive strength;With the increase of water-cement ratio,the pore volume of mortar can be reduced,the structure of mortar is denser,and the anti-shrinkage ability of mortar is enhanced.
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