Abstract
In the construction technology of an earth pressure balance (EPB) shield, soil conditioning is an important technology. It is possible to condition the properties of excavation soil and improve the excavation efficiency by injecting suitable conditioners. Soil conditioning is more important in cohesionless stratum because the flow plasticity of this stratum is typically poor. The soil is conditioned by the interaction between the soil particles and the soil conditioners, the internal principles of which need to be investigated by microscopic tests. Based on the CT test, the changes in porosity after soil conditioning were analyzed, and it was revealed that soil conditioners can make pores form separate structures. Based on the SEM test, the mechanism for the reduction in porosity of the soil was obtained: the flakes formed by the conditioners replaced the original pores.
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