Test Study on Construction Schemes of Mixing Pile in Low-moisture Content Silty Loam

To solve the mixing problem of the drill in the construction of cement-soil mixing pile in low moisture content silty loam in northern China, this paper carries out a feasibility field test study of the two construction schemes, namely, presoaking method and higher water-cement ratio method. They are conducted in the context of the ground treatment of the cement-soil mixing pile used for the foundation of the Dongci drainage culvert and sluice, a sub-project of the Heibei Baigou River governance project (Zhuozhou part). The feasibility of the two schemes under the site condition is compared and analyzed by measuring data regarding the construction speed and compressive strength of cement soil. It is found that both the schemes are applicable on an engineering basis in low moisture content silty loam, but the higher water-cement ratio method is superior to the presoaking method in terms of construction efficiency and effect. Furthermore, on the condition of silty loam, when the higher water-cement ratio method is applied, the optimal water-cement ratio is 1.5, which satisfies construction quality and economy at the same time. The research finding provides not only a new idea for selecting the construction scheme for cement-soil mixing piles in low moisture content silty loam but also reliable construction technical parameters for cement-soil mixing pile construction under similar conditions.