Study on the vertical bearing performance of pile across cave and sensitivity of three parameters

Chen, Hui Yun; Feng, Zhihua; Li, Tie; Bai, Shao Fen; Zhang, Cong

doi:10.1038/s41598-021-96883-7

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…( 1 ) and Eq. ( 2 ) 8 , 38 . where Q i is the axial force of pile; F G , E H and A H is axial pressure, the elastic modulus and the cross-sectional area of a main reinforcement, respectively ( E H is 2.8 × 10 4 MPa and the diameter of the main bar is 28 mm).…”

Section: Resultsmentioning

confidence: 99%

“…The cave under pile causes the lack of bearing layer at the pile bottom, which poses a threat to piles [2][3][4][5] .The bearing performance of bridge pile foundations in karst area has attracted much attention of scholars. Feng, Chen and He successfully predicted the bearing strength and stability of piles that constructed on karst cave based on the high accuracy grey model [6][7][8][9] . Wong and Dong implemented the load-settlement law and calculation method of bearing capacity and safe thickness in karst areas using a static load test and theoretical deduction 10,11 .…”

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confidence: 99%

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Study on the vertical bearing performances of piles on karst cave

Chen

Zhang

Wang³

et al. 2023

Sci Rep

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Caves affected the load transfer mechanism of bridge pile foundation, and then the safety of the bridge was threatened. This study was to investigate the effect of karst cave under bridge pile foundations on the vertical bearing characteristics of bridge pile foundations by static load test, finite element analysis and mechanical model. The settlement of the pile was measured by displacement meter, and the axial force were measured by stress gauges in the test. The load-settlement, the axial force, the unit skin friction and the ratios of side and tip resistances were compared with the result of the simulation. Then sixteen conditions were selected in finite element analysis, one of them was a conventional pile not on cave. The others were about five kinds of height, five kinds of span and six kinds roof’s thickness of the cave. The simply supported and fixed wide beam were established to calculate the allowance roof thickness. The results reveal that when the cave span is greater than 9 m × 9 m or the roof thickness is less than 2 D (pile diameter), the stress and deformation of piles are significantly affected.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Study on the vertical bearing performances of piles on karst cave

Chen

Zhang

Wang³

et al. 2023

Sci Rep

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“…Various foundations are considered depending on the type of construction. Shallow foundations are chosen over deep foundations if the soil carrying capacity is adequate for the weight of the structure 16 , 17 . When the soil carrying capacity is insufficient to support the load of the structure, a deep foundation or a mix of the two is used.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of pile group, piled raft, and footing using finite element software PLAXIS 2D and GEO5

Chimdesa,

Jilo

et al. 2023

Sci Rep

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Foundation plays a vital role in weight transfer from the superstructure to substructure. However, foundation characteristics such as pile group, piled raft, and footing remain unfolded due to their highly non-linear behaviour in different soil types. Bibliography analysis using VOSvierwer algorithm supported the significance of the research. Hence, this study investigates the load-bearing capacity of different types of foundations, including footings, pile groups, and piled rafts, by analyzing experimental data using finite element tools such as PLAXIS 2D and GEO5. The analysis involves examining the impact of various factors such as the influence of surcharge and the effect of different soil types on the load-bearing capabilities of the different types of foundation. For footing, parametric investigations using PLAXIS 2D are conducted to explore deformational changes. Pile groups are analyzed using GEO5 to assess their factor of safety (FOS.) and settling under various criteria, such as pile length and soil type. The study also provides insight into selecting the right type of foundation for civil engineering practice. Findings showed that different soil types have varying deformational behaviours under high loads with sandy soil having less horizontal deformation than clayey soil. Also, it was observed that increasing the pile thickness by 50% resulted in a reduction of 13.88% in settlement and an improvement of 16.66% in the FOS. In conclusion, this study highlights the importance of professionalism, exceptional talent, and outstanding decision-making when assessing the load-bearing capabilities of various foundation types for building structures.

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“…Mei et al designed and proposed a new type of cast-in-place pile to address the problem that piles cannot be formed in the Karst region due to cavities [17]. Increasing the height, span, and number of caves harmed the bearing capacity of pile foundations, according to research by Chen et al on pile foundations through caves [18]. Gotman N Z et al proposed a method to calculate the numerical variation of shear stresses on the lateral surface of piles at various stages of loading by analyzing the extra loads placed on the piles during the formation of cavities [19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Pile Load Transfer Considering Rice Stone Filled-In Gaps between Steel Drive Pipe and Pile Casing in Karst Region

Zhu,

Yang,

Liu

et al. 2023

Sustainability

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For a guarantee of perpendicularity and stiffness in piles in Karst areas, full rotary cast-in-place piles are often utilized, steel pipes are rotarily driven into a stratum, and inner-steel pile casing is positioned. With the engineering background of the bridge piles of Guinan high-speed railway in Guangxi autonomous region, the space between steel drive pipe is filled with rice stones, the load-transfer mechanism of which was studied. An apparatus was designed for pullout of the drive pipe, rice stones are replaced with coarse stones, a simplified organic glass-pipe model is put forward, another similar indoor stratigraphic model is also pre-cast, and the movement of coarse sands and load transfer is studied with two models. The quantity of sands is calculated using back analysis through reappearance and the Rhino model: the first one is estimated using a reproduction of the pullout procedure, the second is calculated through the Rhino model based on the observation of the shape of sand in caves. When the drive pipe is pulled out, some coarse sand flows into the Karst caves and becomes loose, while load is applied on the top of the pile. The movement of coarse sand develops further, and more coarse sand flows into caves close to the bottom; this leads to a reduction its frictional resistance, and the axial force of the pile increases closer to the upper position of the cave, whereas the axial force of the pile is concentrated almost constantly close to the bottom of the cave. Comparing the end resistance and the frictional resistance, coarse sand can bear pile load to a great extent.

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Study on the vertical bearing performance of pile across cave and sensitivity of three parameters

Cited by 6 publications

References 23 publications

Study on the vertical bearing performances of piles on karst cave

Study on the vertical bearing performances of piles on karst cave

Numerical analysis of pile group, piled raft, and footing using finite element software PLAXIS 2D and GEO5

Experimental Study on Pile Load Transfer Considering Rice Stone Filled-In Gaps between Steel Drive Pipe and Pile Casing in Karst Region

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