ABSTRACT
This paper uses vacuum pre-pressure combined with gridded soil mixing wall to treat the deep silty soil of a sheet-pile wharf. Firstly, the soil, after vacuum pre-pressure pretreatment, is tested with cement formulation and test pile. Then the three-dimensional numerical simulation of the quay is carried out by Midas GTS NX to study the force deformation of the gridded cement mixing wall and its influence on the construction process. The results show that: the mechanical parameters of cement-reinforced soil increase rapidly with the increase of cement incorporation ratio (14%, 16%, 18%, 20%), but the increase tends to slow down after increasing to 16%, and the best incorporation ratio of cement is determined to be 16%; according to the test results of field construction process test, the compressive strength of boring core samples with water-cement ratio of 1.5 and 16% cement incorporation can reach the design use requirements. The gridded soil-mixing wall and the soil between the walls jointly coordinate the force conditions of the quay structure and the soil, resisting the vertical and horizontal loads by increasing the overall stiffness and reducing the lateral soil pressure acting on the front wall.
