植物脲酶诱导碳酸盐沉淀改良土体研究进展OACSTPCD

Soil improvement by enzyme induced carbonate precipitation(EICP)is an emerging hot technologie in the field of geotechnical engineering.The research status of soil improvement by EICP are summarized com-prehensively,the key technical parameters are optimized,and the prospects of future development of EICP are pointed out.The standard method of soil improvement by plant urease promoting sinking of calcium carbonate is suggested.The preservation methods of plant urease and the longterm performance of soil improvement by EICP under special environmental conditions are conducted.The research results show that EICP can signifi-cantly improve the performance of soil,the maximal unconfined compressive strength reaches 3 MPa,the abili-ty of wind erosion resistance reaches 29.1 m·s-1,the surface penetration strength reaches 1.065 MPa,the rate of permeability coefficient reduction reaches 98.2％,the rate of heavy metal ion mass content reduction reaches 99.96％.