FEM-BEM coupling analysis of vertically loaded rock-socketed pile in multilayered transversely isotropic saturated media

Ai, Zhi Yong; Chen, Yuan Feng

doi:10.1016/j.compgeo.2019.103437

Cited by 29 publications

(12 citation statements)

References 36 publications

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“…where 𝑢 𝑠 𝑖𝑧 is the vertical displacement of node i, and 𝜎 𝑠 𝑖 represent the excess pore pressure of node 𝑖; 𝑝 𝑠 𝑖𝑧 is the boundary force acting on the node 𝑖 of rock-soil mass; 𝐻 1 𝑖𝑗 and 𝑌 1 𝑖𝑗 denote the flexibility coefficient of rock-soil mass without scour, and they can be obtained from the work of Ai and Cheng. 29 For the layered saturated rock-soil mass under general scour, as described in Figure 2B, the flexibility matrix equations of the rock-soil mass are expressed as…”

Section: Flexibility Matrix Equation Of Rock-soil Mass Under Differen...mentioning

confidence: 99%

“…In the engineering construction, when the building load is high, and the shallow soils cannot provide sufficient side friction resistance to support the superstructure, it is necessary to consider the pile foundation scheme that uses the lower rock mass as the bearing layer, that is, the rock-socketed pile scheme. 1 The rock-socketed piles can not only effectively reduce the settlement of buildings and significantly enhance the safety and stability of a pile foundation, but also adapt to various complex geological conditions. [2][3][4] Therefore, the rock-socketed pile is widely used in high-rise buildings, industrial buildings, ports, bridges, offshore platforms and wind farms, marine drilling platforms, and other projects.…”

Section: Introductionmentioning

confidence: 99%

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Influence of scour on the vertical response of rock‐socketed piles in layered saturated rock–soil mass

Chen

Guo

et al. 2022

Num Anal Meth Geomechanics

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The influence of scour on the vertical response of rock‐socketed piles in a layered saturated rock–soil mass is studied through the finite element‐boundary element coupling method. By utilizing the theoretical solution of layered saturated media as the kernel function, the boundary element method (BEM) is used to deduce the boundary integral equations of rock–soil mass. Meanwhile, the pile is modelled with the three‐node bar element and the global stiffness matrix of the pile is assembled by the finite element method (FEM). Then according to the scour type, the flexibility matrix of the foundation is recombined and extended, which is consistent with the stiffness matrix dimension of the pile. In consideration of the force balance and continuity conditions at the pile‐soil‐rock interface, the FEM–BEM coupling equation is established to solve the interaction between layered rock–soil mass and rock‐socketed pile that considers different scour types. A corresponding MATLAB program is compiled to verify the correctness of the present theory by comparisons with the existing literature solutions, field tests and the finite element solutions. The influences of the scour type, scour depth, socketed length as well as pile‐rock mass modulus ratio and rock mass stratification on the vertical response of a rock‐socketed single pile are further discussed through several numerical examples.

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Section: Flexibility Matrix Equation Of Rock-soil Mass Under Differen...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of scour on the vertical response of rock‐socketed piles in layered saturated rock–soil mass

Chen

Guo

et al. 2022

Num Anal Meth Geomechanics

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“…Basheer et al [14] applied the stiffness degradation method (SDM) to single rock-socketed pile to predict the performance of offshore rock socketed pile under cyclic load. AI et al [15] used the consolidation solution of layered saturated foundation as the kernel function of boundary element method to derive the flexibility matrix of soil and rock mass, and analysed the effects of rock-socketed depth, pile Young's modulus, length diameter ratio and soil-rock interface on the load deformation of rock socketed pile in multi-layer transversely isotropic saturated medium.…”

Section: Introductionmentioning

confidence: 99%

Deformation Analysis and Prediction of Foundation Pit in Soil-Rock Composite Stratum

Qin

Tao²,

Chen

et al. 2022

Front. Phys.

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The deformation prediction of foundation pit is still an open issue in geotechnique engineering. This paper focuses on a new deformation prediction method of foundation pit in soil-rock composite stratum in Nanjing area. To do so, the field monitoring deformation data of deep foundation pit adjacent to the railway in a soil-rock combined stratum is firstly analyzed. Based on these field data, the characteristics of horizontal displacement and surface settlement of rock-socketed support pile, as well as its relationship with Earth excavation are discussed. Results show that the average value of maximum horizontal displacement of support pile in zone with shallow rock depth (soil layer >15 m) is relatively large, which is 3.5 times of that with shallow soil depth (10–12 m into moderately-weathered mudstone). The depth of maximum horizontal displacement is obviously linearly related to the thickness of soil layer (H), while the surface settlement does not change with the increase of soil/rock layer thickness ratio. Utilizing the relationship between the maximum water level displacement and excavation depth, a new Gaussian-type empirical formulation is established to predict horizontal deformation of soil-rock composite stratum with rock-socketed support pile. By comparison with two other methods, it is found that the improved Gaussian curve is in good agreement with the measured horizontal displacement curve. This indicates that the new method can provide a valid reference for the design and construction of foundation pit with rock-socketed support pile in Nanjing area.

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“…The finite element solutions of structure vibratory velocity are then used as the boundary condition for consequent acoustic radiation calculation using the boundary element method (BEM) [9]. The same procedure can be used to analyse the rock-socketed pile in isotropic saturated media [10][11].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis for Coupled Structural-Acoustic System with Absorbing Material Using FEM/BEM

2021

IJEM

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Since the acoustic impedance in water cannot be neglected with respect to the mechanical impedance, the acoustic radiation caused by the vibration of structures in the compressible fluid would react to the structure. Therefore, the fluid-structure interaction needs to be considered. The finite element method is used for structure vibration analysis and the boundary element method for acoustic analysis. Sound absorption materials are used to reduce the scattering sound field in the reference region. The sensitivity analysis of a fully coupled structural-acoustic system is proposed. Numerical tests verify the correctness of the proposed algorithm.

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FEM-BEM coupling analysis of vertically loaded rock-socketed pile in multilayered transversely isotropic saturated media

Cited by 29 publications

References 36 publications

Influence of scour on the vertical response of rock‐socketed piles in layered saturated rock–soil mass

Influence of scour on the vertical response of rock‐socketed piles in layered saturated rock–soil mass

Deformation Analysis and Prediction of Foundation Pit in Soil-Rock Composite Stratum

Sensitivity Analysis for Coupled Structural-Acoustic System with Absorbing Material Using FEM/BEM

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