Abstract
To improve the stress state of traditional antislide pile and utilize the stable soil on both sides of a landslide and slope foot, a spatial arc antislide pile supporting structure was proposed. Based on numerical calculation, a parametric study was conducted to assess the influence of the rise-span ratio on the stress state of the supporting structure, the displacement of the pile top, and the earth pressure in the front of the pile. The optimal rise-span ratio was 3-16 according to the numerical simulation results. An indoor model test at the optimal rise-span ratio was carried out, recording the pile strain and the earth pressure in front of the pile. The results showed that some indices increased with the increase in rise-span ratio, such as the load transferred to the pile at the arch foot, the bending moment of the piles, the displacement of the pile top, and the earth pressure; within a certain depth near the pile top, the soil in front of the pile is loose during the loading processes, and the earth pressure at the range was zero. The overall safety factors of the four supporting models were 2.42, 2.66, 2.78, and 2.84, respectively, which can satisfy the requirements for practical engineering. The test results verify the feasibility and rationality of the spatial arc antislide pile supporting structure, which can provide a new idea for landslide treatment.
Highlights
To take full use of the antislide force of stable soil on the both sides of landslide, some scholars have researched an arc antislide pile, which was arranged on the plane arch line, and the pile top was connected by an arc-shaped coupling beam
In the composite supporting structure, the load transferred from the pile on the arch crown to the pile on the arch foot along the coupling beam, so Mx was existed. e diagram of Mx under the level 5 load is shown in Figure 5. e maximum of Mx was at the top of pile, and Mx at the bottom section of the pile was close to zero
Mx of P1 was the largest, and P4 was the smallest and P2 was between the two piles because the coupling beam transferred load to the pile at arch foot. e pile at arch foot was set as support of the supporting system
Summary
E cross section of the antislide piles and the coupling beam was rectangular, with the dimensions of 40 cm × 30 cm and 60 cm × 60 cm, respectively, as described in Figures 2 and 3. E piles and coupling beam were made of C30 concrete, and the elastic model was used. Vertical uniform distributed pressure was applied on the top of the slope to simulate static vehicle load. E load was divided into five levels, each of which is 30 kPa. By applying vertical load on the slope surface, pushing force of the soil acted on the antislide piles
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