Geotechnical Engineering Properties of Soils Solidified by Microbially Induced CaCO₃ Precipitation (MICP)

Table 3

Advantages and disadvantages of grouting methods.

Method	Procedure	Advantage/disadvantage	Reference
Two-phase grouting method	Placement: bacterial injection, CaCl2 injection	Avoiding clogging	[66]
Parallel injection method	The bacteria and the cementation fluid were injected at the same time	Most calcite precipitating close to the inlet area	[67]
Repeated staged injection method	Bacterial injection, static period for 2 h, cementation fluid injection	Reducing porosity	[67]
Soaking method	Bacterial injection, soaking in the cementation fluid	The pores becoming smaller or even blocked, the cementation fluid being difficult to penetrate into	[68]
Electro-biogrouting method	Imposing electric field with a certain voltage gradient	Promoting the diffusion of biomass in soil pore, more uniform	[69]
Spraying method	Spraying bacteria solution evenly on the surface of sand practices	Improving the average hardness and compressive strength	[70]
Unsaturated percolation method	Using peristaltic pump to control the infiltration rate (the saturation is about 75%)	Having better curing effect, with the average compression strength being 19.7 MPa	[71]