Abstract The combined high retaining structure with little urban space, especially under the deep under-consolidated earth filling condition, was studied based on the project in Liangmao mountain depot of Shenzhen Metro Line 10. The superiority of the combined retaining structure including double-row piles over the pile-slab wall, single-row piles, and gravity retaining wall schemes was confirmed based on the numerical analysis by MIDAS/GTS. Based on the this, the force and deformation characteristics, including the influence of pile diameter, row spacing, and pile length on the displacement and internal force of the retaining structure, were analyzed. The simulation results show that the change of the pile diameter has a great influence on the displacement and the bending moment of the pile. As the row spacing increases, the absolute value of the maximum negative bending moment in the upper part of the front row of piles and the positive bending moment in the lower part tends to decrease. The pile length has some influence on the horizontal displacement of the pile but only a limited influence on the internal force of the pile.
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