Working mechanism and method for theoretical calculation of arch-chord coupled anti-sliding structure

With the increase in the mileage of high-speed railways around the world, subgrade problems related to the same have been emerging in large numbers. In view of the shortcomings of slow construction speed and large disturbance caused by conventional anti-slide piles during emergency reinforcement of subgrades, an "arch-chord coupled anti-slide structure" is proposed in this study, based on the three-dimensional characteristics of the subgrade creep, and its anti-slide mechanism is analyzed; furthermore, a theoretical calculation method for the same is proposed. The results show that the arch-chord coupled anti-sliding structure can form a coupled body containing multiple surrounded piles when subjected to thrust, thus offering a pile-soil composite structure similar to a retaining wall. This results in a large anti-sliding force. By setting a virtual pile to regularize the layout of the structural pile, the pile internal force can be accurately computed. The findings of this study provide a theoretical basis for the analysis and design of coupled anti-sliding structures in future.