Search results for: Yuan-qiang Cai

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article

Bayesian inference of spatially varying parameters in soil constitutive models by using deformation observation data

Yuan‐qin Tao, Hong‐lei Sun, Yuan‐qiang Cai

International Journal for Numerical and Analytical Methods in Geomechanics > 45 > 11 > 1647 - 1663

Parameters of soil constitutive models are usually identified through laboratory tests. The spatial variability of these parameters is generally not considered due to the limitation of the test scale. This study proposes a data‐driven approach to infer the spatially varying parameter of the modified Cam‐clay model from limited field observations and subsequently improves soil settlement predictions...

article

Modeling the process of cohesive sediment settling and flocculation based on CFD–DEM approach

Hong-lei Sun, Dan-ming Li, Shan-lin Xu, Li Shi, more

Granular Matter > 2019 > 21 > 2 > 1-14

The settling process of cohesive sediment particles exists universally in nature and many engineering fields. Some of them have negative impacts, e.g., leading to the storage loss of reservoir, prolonging the duration of the reclamation project. Thus, understanding and quantifying cohesive sediments settling and flocculation processes are of great importance. In the present work, a three-dimensional...

article

Nonlinear consolidation of vertical drains with coupled radial‐vertical flow considering time and depth dependent vacuum pressure

Si‐jie Liu, Xue‐yu Geng, Hong‐lei Sun, Yuan‐qiang Cai, more

International Journal for Numerical and Analytical Methods in Geomechanics > 43 > 4 > 767 - 780

The system of vacuum pressure combined with vertical drains to accelerate soil consolidation is one of the most effective ground improvement methods. The consolidation theories of soft soil improved by vertical drains including void ratio–dependent compressibility and permeability have been widely applied in practice to predict the consolidation behavior. In this paper, analytical solutions of the...

article

Numerical study on clogging of prefabricated vertical drain in slurry under vacuum loading

Li Shi, Qiu-qi Wang, Shan-lin Xu, Xiao-dong Pan, more

Granular Matter > 2018 > 20 > 4 > 1-14

This paper presents a microscopic numerical study on membrane clogging of prefabricated vertical drain (PVD) installed in slurry when treated by vacuum preloading method. The motions of the slurry particles and the pore fluid are described using discrete element method and computational fluid dynamics method, respectively. The PVD membrane is simulated by the hexagonal packing of spherical particles...

article

Study of sedimentation of non-cohesive particles via CFD–DEM simulations

Shan-lin Xu, Rui Sun, Yuan-qiang Cai, Hong-lei Sun

Granular Matter > 2018 > 20 > 1 > 1-17

The sedimentation process of granular materials exists ubiquitously in nature and many fields which involve the solid–liquid separation. This paper employs the coupled computational fluid dynamics and discrete element method (CFD–DEM) to investigate the sedimentation process of non-cohesive particles, including the hindered settling stage and the deposition stage. Firstly, the coupled CFD–DEM model...

article

Cyclic deformation behaviour of natural K ₀-consolidated soft clay under different stress paths

Lei Sun, Yuan-qiang Cai, Chuan Gu, Jun Wang, more

Journal of Central South University > 2015 > 22 > 12 > 4828-4836

Characteristic of cyclic loading due to passing wheels is associated with one-way loading without stress reversal, which includes a simultaneous cyclic variation of vertical normal stress and horizontal normal stress lasting for a long period of time and generally takes place in partially-drained conditions. Therefore, it is of great practical relevance to study the deformation behaviour according...

article

Seismic effects of incident P waves on an embedded foundation in poroelastic half-space

Peng Wang, Yuan-qiang Cai, Guang-ya Ding, Li-zhong Wang

Journal of Sound and Vibration > 2012 > 331 > 7 > 1597-1611

Dynamic vibrations of a circular rigid foundation, which is embedded in poroelastic soil and subjected to incident P waves, are studied by semi-analytical methods in this present work. The motion of the soil is governed by Biot's dynamic poroelastic theory. A set of potentials are introduced to represent the incident waves, and the scattering waves caused by the foundation are considered based on...

chapter

Application of modified Goodman contact element in numerical analysis

Chang-jie Xu, Ru Mou, Yuan-qiang Cai, Xiao-hua Ma

2011 International Conference on Multimedia Technology > 983 - 987

2011 International Conference on Multimedia Technology (ICMT)

The Goodman element is widely used to simulate the contact of two different materials, however sometimes it causes large error in stress calculation and element embedding. In this paper, a further modified contact element is proposed, the better element has its own thickness, furthermore, when composed, the element normal connecting form is adopted as the changing mode associated with normal displacement:...

article

Rocking vibrations of a rigid circular foundation on poroelastic half-space to elastic waves

Peng Wang, Yuan-Qiang Cai, Chang-Jie Xu, Hong-Lei Sun, more

Soil Dynamics and Earthquake Engineering > 2011 > 31 > 4 > 708-715

A study is carefully conducted for the rocking response of a rigid circular foundation resting on a poroelastic half-space when subjected to seismic waves under the framework of Biot’s theory. The free-field waves, rigid-body scattering field waves and radiation scattering field waves are introduced to consider the complex behavior of the soil owing to the scattering phenomena caused by the existence...

article

Change of hydraulic conductivity during compression of undisturbed and remolded clays

Ling-Ling Zeng, Zhen-Shun Hong, Yuan-Qiang Cai, Jie Han

Applied Clay Science > 2011 > 51 > 1-2 > 86-93

Eight series of falling head hydraulic conductivity tests were performed on both undisturbed and remolded specimens of four clays from China using a modified oedometer to investigate the change of hydraulic conductivity during compression. Similar to their compression behavior, the undisturbed specimens showed the curves of hydraulic conductivity versus effective vertical stress lying above those...

article

Torsional response of a rigid circular foundation on a saturated half-space to SH waves

Yuan-qiang Cai, Peng Wang, Hong-Lei Sun, Chang-jie Xu

Soil Dynamics and Earthquake Engineering > 2010 > 30 > 10 > 1082-1088

An analytical approach is used to study the torsional vibrations of a rigid circular foundation resting on saturated soil to obliquely incident SH waves. Biot’s poroelastic dynamic theory is considered to characterize the saturated soil below the foundation, which is solved by Hankel transform later. In order to consider the scattering phenomena caused by the existence of the foundation, the total...

article

Consolidation analysis of a semi-infinite transversely isotropic saturated soil under general time-varying loadings

Yuan-qiang Cai, Xue-yu Geng

Computers and Geotechnics > 2009 > 36 > 3 > 484-492

This paper presents the results of a parametric study investigating the axisymmetric consolidation of a semi-infinite transversely isotropic saturated clay subjected to a time-varying circular pressure at the ground surface. Based on Biot’s governing consolidation equations for transversely isotropic clay, the general solutions have been previously derived by applying the Laplace–Hankel transform...

article

Amplitude reduction of elastic waves by a row of piles in poroelastic soil

Yuan-Qiang Cai, Guang-Ya Ding, Chang-Jie Xu

Computers and Geotechnics > 2009 > 36 > 3 > 463-473

This paper studies the displacements behind a row of elastic piles in a homogeneous unbounded poroelastic soil after excitation by the passage of elastic waves. Biot’s theory is employed to describe soil behavior. Using a Fourier–Bessel series expansion with the aid of a translational addition theorem, closed-form expressions for the scattering coefficients are developed by imposing continuity conditions...

article

Screening of plane S waves by an array of rigid piles in poroelastic soil

Yuan-qiang Cai, Guang-ya Ding, Chang-jie Xu

Journal of Zhejiang University-SCIENCE A > 2008 > 9 > 5 > 589-599

An array of rigid piles used as a screening barrier for plane shear (S) waves is investigated in a homogeneous unbounded space. The dynamic poroelastic theory of Biot is employed, under the assumption of an incompressible solid grain. Using Fourier-Bessel series, the problem of multiple scattering is solved by imposing continuity conditions and equilibrium conditions at the soil-pile interfaces with...

article

Solution of one-dimensional finite-strain consolidation of soil with variable compressibility under cyclic loadings

Yuan-Qiang Cai, Xue-Yu Geng, Chang-Jie Xu

Computers and Geotechnics > 2007 > 34 > 1 > 31-40

Based on Gibson’s governing equation for one-dimensional finite-strain consolidation of a saturated thick soil layer, a simple semi-analytical method is developed to solve the problem of one-dimensional consolidation by taking into account the varied compressibility of soil under cyclic loadings. The solution in the transformed domain is obtained using the method of Laplace transforms. Thereafter...

article

Torsional vibrations of rigid circular plate on transversely isotropic saturated soil

Da-zhi Wu, Yuan-qiang Cai, Chang-jie Xu, Hong Zhan

Applied Mathematics and Mechanics > 2006 > 27 > 11 > 1541-1548

An analytical method was presented for the torsional vibrations of a rigid disk resting on transversely isotropic saturated soil. By Hankel transform, the dynamic governing differential equations for transversely isotropic saturated poroelastic medium were solved. Considering the mixed boundary-value conditions, the dual integral equations of torsional vibrations of a rigid circular plate resting...

article

Vertical vibration analysis of axisymmetric saturated soil

Yuan-qiang Cai, Chang-jie Xu, Zao-feng Zheng, Da-zhi Wu

Applied Mathematics and Mechanics > 2006 > 27 > 1 > 83-89

Based on Biot’s dynamic consolidation equations, by means of Laplace-Hankel transform technology, the integral solutions of stress and displacement in saturated soil with subjacent rock-stratum under axisymmetric arbitrary excitations were derived. Influence of the reflected wave generated by the boundary was revealed. Numerical results indicate that the vibration frequency has some effect on the...

article

Stable response of axisymmetric two-phase water-saturated soil

Yuan-qiang Cai, Kai Meng, Chang-jie Xu

Journal of Zhejiang University-SCIENCE A > 2004 > 5 > 9 > 1022-1027

Biot’s dynamic consolidation equations and Hankel transform were used to derive the integral solutions of stress and displacement for axisymmetric harmonic excitations in the two-phase saturated soil with subjacent rock-stratum. The influence of the coefficient of permeability and loading frequency on the soil displacement at the ground surface were studied. The results showed that higher loading...

article

One-Dimensional Consolidation of Layered and Visco-Elastic Soils under Arbitrary Loading

Yuan-qiang Cai, Chang-jie Xu, Hai-ming Yuan

Applied Mathematics and Mechanics > 2001 > 22 > 3 > 353-360

Based on the layered visco-elastic soil model, according to the Terzaghi's one dimensional consolidation theory, by the method of Laplace transform and matrix transfer technique, the problems about the consolidation of layered and saturated visco-elastic soils under arbitrary loading were solved. Through deductions, the general solution, in the terms of layer thickness, the modulus and the coefficients...

article

Seismic wave propagation in viscoelastic and saturated rock

Yuan-Qiang Cai, Chang-Jie Xu, Shi-Ming Wu

Earthquake Science > 1998 > 11 > 3 > 295-300

Considering engineering practice, the viscoelastic two-phase model is adopted, seismic wave propagation in saturated rock is studied. Not only the effect of the viscosity of rock skeleton but also the effect of ground water on the propagation of the seismic wave can be considered by this model, the propagation characteristics of seismic wave in saturated rock can be understood comprehensively and...

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