有机材料联合EICP固化黄泛区粉土抗剪特性

his paper proposed a technology to combine organic materials (glutinous rice flour, brown sugar and skimmed milk powder) with EICP technology to solidify silt in the Yellow river flood area as a countermeasure to the problem that the enzyme-induced calcite precipitation (EICP) lacks nucleation sites and is not ideal for fine-grained soil solidification, .The effect of organic materials on the shear properties of silt solidified by EICP in the Yellow river flood area was analyzed by direct shear test, and the underlying improvement mechanism was analyzed by means of scanning electron microscope. The results show that, compared with the traditional EICP, the improvement of soil shear strength and foundation bearing capacity of organic materials combined with EICP are increased by 5.7%-20.3% and 6.2%-32.2%, respectively. The improvement of soil shear strength is mainly due to the improvement of cohesion, and the improvement effect of skimmed milk powder is the best among the tested organic materials. Within a certain range of the plastic limit of natural soil, the shear strength and foundation bearing capacity of soil are the most sensitive to the change of the content of reaction solution. The results confirm that the organic material modified EICP is efficient and economical, and can be used for the reinforcement of fine-grained soil foundation in practical engineering.