Abstract: Soil solidification based on Microbial Induced Carbonate Precipitation ( MICP) or Enzyme-induced Calcium Carbonate Precipitation (EICP) is a trendy green and environmentally friendly foundation treatment technology in the field of geotechnical engineering in recent years. Compared with the MICP method,the EICP method is not easily restricted by environmental factors when dealing with engineering geological problems and the cost is lower. In this paper,a series of experimental studies have been carried out to improve the seepage-mechanical properties of sandy soil by EICP method. The EICP grouting mineralization test was carried out by using the carbon fiber reinforcement method and the porosity,permeability,calcium carbonate content and other indicators of the sand were systematically analyzed. The test results showed that after adding carbon fiber to the sand,under the action of EICP mineralization,CaCO3 crystals have different deposition conditions on the surface of the fiber,the surface of the sand and the fiber are roughened to different degrees and the pores between the sand particles can be filled and cemented. When the content of carbon fiber is 1. 2%,the performance in all aspects is optimal. The above test results show that the carbon fiber-based EICP mineralization method can inhibit the brittle failure of sand and improve the permeability-mechanical properties of sand. Under the background of " Dual Carbon" ,it has good application prospects and development potential.

Key words: EICP,sand soil,carbon fiber,infiltration-mechanical properties