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| Analysis method for portal double-row anti-slide piles considering load distribution by horizontal soil arching between piles |
| CHENG Dong1, 2, ZHU Yanpeng1, 2*, YANG Yunbo1, 2, FANG Guangwen3, HUANG Anping3 |
| (1. School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 3. School of Environment and Urban Construction, Lanzhou City University, Lanzhou, Gansu 730070, China) |
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Abstract Due to their excellent anti-sliding performance and efficient construction advantages, Portal-type Double-Row Anti-Slide Piles are extensively utilized in large-scale soil landslide control projects. However, existing analytical methods inadequately account for the distribution mechanism of landslide thrust exerted by the horizontal soil arch between piles in the loaded section. To address this issue, a simplified calculation method for landslide thrust distribution in the region behind the arch formed by horizontal soil arches between piles was proposed, based on the limit equilibrium method. Next, considering the slip surface as the boundary, the portal-type double-row anti-slide piles are divided into a load-bearing segment and an embedded segment. A calculation model for the reinforcement of soil landslides by portal-type double-row anti-slide piles is established, which takes into account the distribution effect of the inter-pile horizontal soil arch. By incorporating rigid and semi-rigid connection conditions between the pile top and the crown beam, the force method was adopted to solve the model and derive a corresponding calculation method for the internal forces and deformations of the pile shaft. Utilizing the proposed method, a case study was conducted to verify its accuracy through comparison with numerical simulation results, alongside a sensitivity analysis of key parameters. The study yields several conclusions: there is a significant difference in the pile top bending moment between the front and rear row piles, the rear row piles exhibit a sheltering effect on the front row piles. As the stiffness ratio between the crown beam and the pile body increases, the pile top horizontal displacement and the maximum bending moment of the pile shaft for both the front and rear row piles decrease non-linearly, and increasing the horizontal subgrade reaction coefficient of the embedded segment can effectively reduce the pile top horizontal displacement without significantly affecting the bending moment of the pile shaft.
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2026, Vol. 45 
