Laboratory Model Test of Fully Buried Portal Frame-Shaped Slope-Stabilizing Piles

Dai, Zihang; Zhihua, Qiu; Li, Hengyang; Cai-jin, LU; Yang, Jianhui

doi:10.1520/gtj20210031

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…The sectional bending moment of the pile was calculated based on the data collected through strain gauges. The calculation formula can be expressed in Equation (20). The direction of the pile bending moment was defined according to the coordinate system and concerning the right-hand rule, as shown in Figure 9.…”

Section: Test Resultsmentioning

confidence: 99%

“…Some scholars indicated that the crown beam plays a significant role in coordinating the deformation of anti-slip piles, and the back-row piles had a greater impact on slope stability than the front-row piles [17,18]. Reliability and economic efficiency are two important factors for portal frame composite structure, and excessively large pile spacing and crown beam size leads to the failure in the slope reinforced by anti-slide piles, which may weaken the soil arching effect [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Research on Mechanical Characteristics of Slope Reinforcement by Spatial Arc Crown Beam Composite Supporting Structure

et al. 2022

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To effectively optimize the mechanical behavior of a traditional anti-slide pile and reduce environmental destruction, a new method for slope reinforcement by a spatial arc crown beam composite supporting structure was proposed. First, a numerical model was validated through lab-scale model test data obtained herein, and then a full-scale numerical model was created for an in-depth understanding of the distribution regularity of displacement along the pile, the soil pressure, the crown beam stiffness, and so on. The results demonstrated that: (1) The spatial arc crown beam is simplified to a two-hinged arch, and the maximum value of the bending moment in the arc crown beam is about one-third of the straight crown beam through theoretical calculation. (2) The spatial arc crown beam redistributes the load sharing among different piles, and the extreme bending moment of other piles varies within 10% along the downhill direction except for the piles at the slope foot. (3) Bending moments are close to zero at the pile end, and the anti-slide pile can be simplified as a vertical beam with one end fixed and the other end hinged. (4) The axial force in the spatial arc crown beam is always presented as pressure, so the crown beam can make full utilization of the compression resistance of concrete. (5) The distribution characteristic of soil pressure in front of the pile at the arch foot is different from that in other positions, and the stable soil at the slope foot provides greater soil resistance for anti-piles. (6) As the crown beam stiffness is above five times the reference value, the axial force of the crown beam tends to be stable, and as the crown beam stiffness increases continually, the maximum value of My is −1013.13 kN·m, and the constraining effect of the crown beam is gradually weakened.

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Section: Test Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Mechanical Characteristics of Slope Reinforcement by Spatial Arc Crown Beam Composite Supporting Structure

et al. 2022

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“…Compared with the single pile, the combination pile offers two prominent advantages (Dai et al, 2022;Xiong et al, 2022;Zhao et al, 2022).…”

Section: Improving the Applicability Of The Anti-slide Pile 2211 Comb...mentioning

confidence: 99%

Anti-slide pile structure development: New design concept and novel structure

et al. 2023

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The anti-slide pile is one of the most used measures in landslide control globally. Following its application, various structures have been developed. In this paper, we analyze the anti-slide pile structure development process and extract two development paths. One path is aimed at improving the applicability. The second path starts from an in-depth study of pile–soil interactions. However, these two paths share a single design concept: The anti-slide pile provides direct resistance to maintain landslide stability, that is, the anti-slide pile and the landslide body are thought to be confrontational sides. We here propose developing and utilizing the landslide body in anti-slide pile design. Accordingly, the confrontation relationship between the anti-slide pile and the landslide body can be changed while shifting away from the view that the landslide body is only a hazard. On this basis, we also design a novel structure: An arm-stretching-type anti-slide pile. The simulation verification results show that this novel structure works well in realizing the proposed design concept. Compared with the commonly used wholly buried pile, the safety factor of the landslide controlled by the novel structure is improved by 43.56%. This study promotes the design concept of anti-slide pile developing from the existing slide–resist single mode to the slide–self-stabilize–resist compound mode.

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Finite difference analysis of slope anchor frame resting on Vlasov Foundation considering influence of friction resistance and axial loads

Dai,

Yang,

Tang

et al. 2023

Preprint

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With the development of anchorage technology, slope anchor frames have become a preferential earth-retaining structure in controlling landslides or reinforcing slopes. However, no accurate and highly efficient design calculation method has been proposed. To date, they are usually simplified as cross-foundation beams resting on flat ground without considering the influence of friction resistance and axial loads induced by the tensile forces of anchor bolts. That will lead to a calculation result significantly deviating from the reality. For that, the paper regarded them as the actual cross beams resting on a slope viewed as the accepted Vlasov Foundation. A new concept, the friction-mobilizing ratio, was presented to establish the flexural differential equation of the beams. The finite difference solution to this problem was then proposed. The friction-mobilizing ratio can also be employed to determine and avoid the upclimbing phenomena of a frame. In the meantime, a highly efficient approach for the load share and adjustment at the intersections of the vertical and horizontal beams was presented. The entire computation process can be implemented by the finite difference program developed using MATLAB. The proposed method was validated through the finite element method but is much more efficient than the latter.

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Laboratory Model Test of Fully Buried Portal Frame-Shaped Slope-Stabilizing Piles

Cited by 3 publications

References 24 publications

Research on Mechanical Characteristics of Slope Reinforcement by Spatial Arc Crown Beam Composite Supporting Structure

Research on Mechanical Characteristics of Slope Reinforcement by Spatial Arc Crown Beam Composite Supporting Structure

Anti-slide pile structure development: New design concept and novel structure

Finite difference analysis of slope anchor frame resting on Vlasov Foundation considering influence of friction resistance and axial loads

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