Influence of Karst Caves at Pile Side on the Bearing Capacity of Super-Long Pile Foundation

Wang, Peisen; Ding, Hongyan; Zhang, Puyang

doi:10.1155/2020/4895735

Cited by 10 publications

(6 citation statements)

References 10 publications

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“…e determination of foundation bearing capacity is crucial in the design of foundation. erefore, the determination of foundation bearing capacity of frozen soil under freezing conditions through tests is also critical for application in practical projects [25][26][27][28][29][30][31][32][33][34]. rough the test and analysis in this chapter, it is concluded that when the temperature gradually decreases, due to the cementation of ice in the soil, the bearing capacity of the foundation will significantly increase.…”

Section: Test Methodmentioning

confidence: 95%

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

2022

Computational Intelligence and Neuroscience

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In order to further improve the construction quality of water conservancy projects under different soil conditions and ensure the safety, stability, and durability of water conservancy project foundation construction under special circumstances, this study takes the bearing capacity of water conservancy land foundation as the research direction, takes frozen soil foundation and bag gravel pier composite foundation as examples, and further optimizes the parameters of foundation bearing capacity by using the theory of foundation ultimate bearing capacity and related algorithms. The P-S curve of bearing capacity shows that when the foundation is frozen to −15°C and the foundation sum is about 190 kN, the P-S curve trend at this time changes significantly, which is not different from the indoor simulation result of 170 kN. The final numerical analysis of foundation bearing capacity is relatively reliable, which can provide a powerful reference for the calculation of foundation bearing capacity of hydraulic engineering.

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Section: Test Methodmentioning

confidence: 95%

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

2022

Computational Intelligence and Neuroscience

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“…Research indicates that currently, many scholars are focusing on the study of settlement issues in bridge pile foundations. And the numerous studies carried out indicate that bad geological conditions (karst area [1][2][3][4][5], groundwater [6][7][8][9]), human engineering activities (foundation pit excavation [10][11][12][13], coal mining [14,15]), and other factors will affect the settlement and deformation of adjacent bridge pile foundation. However, there are few studies on the abnormal uplift of bridge pile foundation, and there is a lack of certain conclusions and theoretical basis.…”

Section: Introductionmentioning

confidence: 99%

Study on Arching Mechanism of Bridge Pile Foundation: Taking the Shiyangtai No.1 Bridge as an Example

Wang,

Sun,

et al. 2024

Buildings

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The structure of a bridge has certain peculiarities, and its pile foundations are susceptible to uplift or settlement deformation due to various factors. This can result in bridge deck cracking, structural instability, tilting, and even irreversible damage, which significantly impacts the bridge’s stability and driving safety. This study focuses on the Shiyangtai No.1 Bridge and aims to investigate the factors that cause abnormal rise and fall deformations of bridge pile foundations. The study combines macro and micro analysis, physical characteristic testing of the overlying soil under the bridge pile foundation, and numerical simulation of the bridge pile foundation in the goaf. The study discusses in-depth the formation mechanism of the abnormal uplift of some pile foundations of the Shiyangtai No.1 Bridge based on the analysis of the factors influencing the abnormal rise and fall deformation of the bridge pile foundations at home and abroad. The expansive soil beneath the pile foundation is weak, and the force generated by the water expansion is insufficient to cause the pile foundation to rise to 309 mm. The results indicate that the pile foundation of the bridge is not affected by the expansion characteristics of the overlying soil. The collapse of the goaf roof generates double lateral thrust from the accumulation body at the bottom of the goaf and the upper collapse arch. This causes staggered bending uplift of the sandstone soil layer, resulting in upward squeezing pressure that causes the bridge pile foundation to rise. Therefore, the coal mining area is the main factor influencing the abnormal uplift of the pile foundation of the Shiyangtai No.1 Bridge.

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“…The bearing capacity of the pile end in a multi-cavity stratum was examined by Liang et al, who concluded that it declined as the cavity diameter increased [13]. By computationally simulating variables such as cavity length, height, and top-plate thickness, Wang et al investigated the impact of cavities on the bearing capacity of super-long pile foundations and concluded that the cavities had little impact on the pile foundations' dynamic response [14]. In numerical simulations of cavern span variations on the bearing characteristics of bridge pile foundations, Feng et al discovered that the pile side friction resistance tends to decrease with increasing cavern span [15].…”

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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Influence of Karst Caves at Pile Side on the Bearing Capacity of Super-Long Pile Foundation

Cited by 10 publications

References 10 publications

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

Study on Arching Mechanism of Bridge Pile Foundation: Taking the Shiyangtai No.1 Bridge as an Example

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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