The Effect of MICP on Physical and Mechanical Properties of Silt with Different Fine Particle Content and Pore Ratio  
[PERSON]  
1 College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China; [EMAIL_ADDRESS] (Y.Z.); [EMAIL_ADDRESS] (Q.W.); ymenghan12236163.com (M.Y.); [EMAIL_ADDRESS] (X.C.); [EMAIL_ADDRESS] (Z.X.); [EMAIL_ADDRESS] (X.H.);  
[PERSON]  
1 College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China; [EMAIL_ADDRESS] (Y.Z.); [EMAIL_ADDRESS] (Q.W.); ymenghan12236163.com (M.Y.); [EMAIL_ADDRESS] (X.C.); [EMAIL_ADDRESS] (Z.X.); [EMAIL_ADDRESS] (X.H.);  
[PERSON]  
1 College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China; [EMAIL_ADDRESS] (Y.Z.); [EMAIL_ADDRESS] (Q.W.); ymenghan12236163.com (M.Y.); [EMAIL_ADDRESS] (X.C.); [EMAIL_ADDRESS] (Z.X.); [EMAIL_ADDRESS] (X.H.);  
[PERSON]  
1 College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China; [EMAIL_ADDRESS] (Y.Z.); [EMAIL_ADDRESS] (Q.W.); ymenghan12236163.com (M.Y.); [EMAIL_ADDRESS] (X.C.); [EMAIL_ADDRESS] (Z.X.); [EMAIL_ADDRESS] (X.H.);  
[PERSON]  
1 College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China; [EMAIL_ADDRESS] (Y.Z.); [EMAIL_ADDRESS] (Q.W.); ymenghan12236163.com (M.Y.); [EMAIL_ADDRESS] (X.C.); [EMAIL_ADDRESS] (Z.X.); [EMAIL_ADDRESS] (Z.X.);  
Zhengzhou University, Zhengzhou 450052, China  
1 School of Rail Transportation, Soochow University, Suzhou 215131, China  
soil classified as silt was tested by [PERSON] et al. [12; 13], and the greatest improvements in shear strength and reduction in hydraulic conductivity achieved are 100% and 90%, respectively. [PERSON] et al. [14] studied the changes of hydraulic conductivity of fine sand and silt after MICP treatment, and the test proved that the application of MICP reduced the hydraulic conductivity of soil, while improving its strength and stiffness. By adding finer particles changing the grain size distribution, [PERSON] et al. [15] concluded samples treated by microorganisms had better fine particle content behavior better in the erosion test. [PERSON] et al. [16] indicates that incorporation of fly ash in Biological cement reaction is an effective means of increasing the strength of soils. Moreover, void ratio (relative density) is taken into consideration on the improvement of soils. [PERSON] et al. [17] conducted triaxial consolidation and drainage tests on sand with different relative compactness (Dr = 30%, 50%, 90%), and found that the strength and deformation control of biochemical loose and moderately compacted sand could reach or exceed that of compacted sand.  
However, experimental data on microbial cemented silt are still very limited considering the variation of both grain size distribution and void ratio. Therefore, the effects of grain size distribution and void ratio on the bio-mineralization process and mechanical properties of microbial cemented silt require further investigation. In the present study, three different types of silt samples with two different void ratios were treated with biological cementation, and the yield of calcium precipitation and uniaxial compression strength (UCS) of the silt samples after biological cementation were evaluated and discussed.