
Xiangcou ZhengDurham University | DU · Department of Engineering
Xiangcou Zheng
Doctor of Philosophy
About
43
Publications
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Introduction
Xiangcou Zheng currently works at the Department of Geoscience and Engineering, Delft University of Technology.
Skills and Expertise
Additional affiliations
September 2017 - April 2022
September 2014 - June 2017
Publications
Publications (43)
Both foam and bentonite slurry are commonly employed in soil conditioning to prevent water spewing during earth pressure balance (EPB) shield tunnelling. A novel calculation model to estimate the permeability coefficient of soils conditioned with foam and bentonite slurry is developed. In this model, bentonite particles are assumed to adhere to the...
Several numerical challenges exist in the analysis of water-mooring line systems which require robust, yet practical, methods to address this type of fully coupled nonlinear dynamic problems. The present study proposes a novel class of numerical techniques for the formulation and implementation of a fully coupled dynamic system which involves water...
Foam conditioning is a widely adopted technique in earth pressure balance (EPB) shield tunneling for the purpose of reducing sand permeability and preventing water spewing. The permeability of foam-conditioned sands differs from that of natural sands due to the presence of foam bubbles. This study investigated the effect of water pressure on the pe...
The water permeability of conditioned soils is one of the most essential properties for Earth Pressure Balance (EPB) tunnelling in coarse-grained soils. Permeability tests are conducted to study the influence of water heads on the permeability of foam-conditioned sands. The initial permeability coefficient of foam-conditioned sands increases with t...
Tunnelling-induced ground responses in coarse-grained soils often exhibit complex behaviours such as soil arching and progressive ground instability. However, the effect of particle size distributions (PSDs) on ground responses in tunnelling remains largely unexplored. This study provides new insights into PSD's effect on tunnelling ground response...
A hybrid material point/finite volume method for the numerical simulation of shallow water waves caused by large dynamic deformations in the bathymetry is presented. The proposed model consists of coupling the nonlinear shallow water equations for the water flow and a dynamic elastoplastic system for the seabed deformation. As a constitutive law, w...
This paper presents a stability study on the collapse mechanisms of a plane-strain tunnel face in c-ϕ soils using the upper bound finite element method with rigid translatory moving elements (UBFELA-RTME) and nonlinear programming technique. Practical considerations are given to the unlined length influence behind the tunnel face. An advanced mesh...
This study presents an efficient and robust adaptive remeshing strategy in the kinematic upper-bound limit analysis in association with using six-node triangular elements and Second–Order Cone Programming (SOCP). In particular, a Synchronous Mesh Refining–Coarsening (SMRC) algorithm following a posterior plastic dissipation-based error indicator an...
This study presents the formulation and implementation of a fully implicit stabilised Material Point Method (MPM) for dynamic problems in two-phase porous media. In particular, the proposed method is built on a three-field formulation of the governing conservation laws, which uses solid displacement, pore pressure and fluid displacement as primary...
The Material Point Method (MPM) has been gaining increasing popularity as an appropriate approach to the solution of coupled hydro-mechanical problems involving large deformations. This study extends the implicit GIMP-patch method for coupled poroelastic problems recently proposed by Zheng et al. (2021b) to tackle large-deformation problems in (nea...
This paper presents a single-point Material Point Method (MPM) for large deformation problems in two-phase porous media such as soils. Many MPM formulations are known to produce numerical oscillations and inaccuracies in the simulated results, largely due to numerical integration and stress recovery performed at non-ideal locations, cell crossing e...
The material point method (MPM) shows promise for the simulation of large deformations in history-dependent materials such as soils. However, in general, it suffers from oscillations and inaccuracies due to its use of numerical integration and stress recovery at non-ideal locations. The development of a hydro-mechanical model, which does not suffer...
Because of the extreme terrain limitations and heavy traffic in congested urban areas, the supporting structures for deep excavations often undergo an asymmetric loading condition at two sides. This article reports the results of an investigation based on detailed numerical modeling of the supporting scheme and mechanical performance of a deep exca...
Stress oscillations in the material point method (MPM) are one of the major reasons unrealistic results are obtained. In this paper an investigation of the stress oscillations occurring when using one- and two-phase approaches is performed. Specifically, an axisymmetric benchmark and a two-dimensional plane strain problem are used to demonstrate an...
Stress oscillations in the material point method (MPM) are one of the major reasons unrealistic results are obtained. In this paper an investigation of the stress oscillations occurring when using one- and two-phase approaches is performed. Specifically, an axisymmetric benchmark and a two-dimensional plane strain problem are used to demonstrate an...
The effect of footing roughness on the bearing capacity factor Nγ and failure mechanism of a strip footing on pure sand were examined using an upper bound finite element method with rigid translatory moving elements (UBFEM-RTME). The analysis was performed with different combination values of the footing–sand friction angle (δ) and the sand frictio...
The stability and failure mechanism of an unlined elliptical tunnel affected by surcharge loading in c-ϕ soils are determined by the upper-bound finite element methods with rigid translatory moving elements (UBFEM-RTME), which is seldom investigated previously. Variations in upper bound dimensionless loading coefficients σs/c and associated failure...
This paper investigates the ultimate bearing capacity factor (Nγ) and failure mechanisms of multiple rough strip footings with equally clear spacing (S) placed on pure sand using the upper-bound finite-element method with rigid translatory moving elements (UBFEM-RTME). Parametric analysis is performed by varying the dimensionless clear spacing (S/b...
The stability of dual circular tunnels subjected to surcharge loading in cohesive-frictional soils, obeying the Mohr–Coulomb failure criterion, is determined by an upper bound finite element method combined with rigid translatory moving elements (UBFEM-RTME). The stability results, which are considered to be influenced by the soil internal friction...
This study investigates the stability of dual unlined elliptical tunnels in cohesive-frictional soils using upper-bound finite element methods with rigid translatory moving elements (UBFEM-RTME). Results are determined in terms of dimensionless stability numbers, which increase with ϕ and decrease with increasing B/D and C/D, and collapse mechanism...
The stabilities and associated collapse mechanisms of deep buried unlined elliptical tunnels in cohesive–frictional (c–ϕ) soils with the action of soil weight are investigated by the “upper-bound finite element method with rigid translatory moving elements” (UBFEM–RTME). The soil masses are assumed to obey the Mohr–Coulomb yield criterion and a non...
In this study, the stability of an elliptical tunnel in cohesionless soils was determined by an upper-bound theorem in combination with triangular rigid translatory moving elements. The elliptical tunnel had a height D under a depth of cover C and a span B. The lining, used to support the tunnel, was equivalent to applying uniform internal compress...