Xin Tan

Xin Tan
Hunan University · College of Civil Engineering

PhD
٩(●̮̃•)۶ ≧◔◡◔≦ (¬‿¬)

About

47
Publications
13,154
Reads
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619
Citations
Additional affiliations
December 2017 - present
Hunan University
Position
  • Professor (Associate)
April 2014 - November 2017
Hunan University
Position
  • Professor (Assistant)
November 2009 - December 2013
Technische Universität Bergakademie Freiberg
Position
  • PhD Student

Publications

Publications (47)
Article
Full-text available
The steel pipe diagonal brace is often used to rescue and protect the sidewall of the excavation when the ground deformation reaches the alert threshold. However,its bearing capacity depends on the stability of the ground close to the diagonal brace foot. A series physical model tests were conducted to study the stability of the diagonal brace foot...
Article
Full-text available
Based on the field measured data of a foundation pit project and the numerical simulation method,the effects of deep foundation pit excavation on the deformation characteristics and internal force changes of adjacent shallow foundation frame structures are studied. The three-dimensional numerical model considering the interaction between structure-...
Article
Full-text available
In order to predict the mechanical behavior of a fully grouted bolt in tunnels,a novel interfacial model with hyperbolic tangent function to describe the relationship of shear stress and interfacial slip has been proposed in this study.Using this model,the loadtransferring equation of a fully grouted bolt that undergoes the surroundingrock deform...
Article
Full-text available
The finite difference method is used to numerically simulate the complete bearing and failure process of a single stone column under vertical loading in soft soil. The plastic hardening constitutive model considering volumetric strain interception is used to simulate the stone column, which can well reflect the nonlinear dilatancy mechanical behavi...
Article
Full-text available
Based on the asymmetric excavation project adjacent to an existing shallow foundation building in Changsha, the proposed study used the finite difference numerical program to establish numerical models that considers the interaction between the structural foundation and the ground. Through the numerical simulation method, the influence of different...
Article
Full-text available
The spatial variability of soil properties is inherent. A series of direct shear tests were carried out on strongly weathered slates samples with weak bedding planes, the result of which indicates the existence of variability of shear strength parameters. Based on the testing results, several numerical simulations of slopes were conducted consideri...
Article
The accidents caused by the instability of bedding rock slope are often encountered in the expressway construction and operation in China. The shear strength parameters of the structural plane play a major role in controlling the stability of the bedding rock slope. In this paper, in-situ direct shear tests were performed on the structural planes c...
Article
Full-text available
The geogrid-encased stone column under an axial loading test has been numerically modeled with the DEM stone column wrapped by the FDM shell-typed encasement. The column was modeled using nonspherical rigid particles considering the actual shape and size distribution of gravel, which better represents the discrete nature of stone columns. The ratio...
Article
Full-text available
Statistical landslide susceptibility mapping (LSM) models have been most widely used in literatures. However, limitations and uncertainties remain in these methods. The main goal of the current study was to test and compare the efficiency of a bivariate model (the weight of evidence (WoE)), a multivariate model (logistic regression (LR)) and a mach...
Article
Full-text available
The equivalent shear strength of the composite soil reinforced by stone columns was studied using an FDM-DEM numerical method. In the numerical model of composite soil, the stone column was represented by discrete rigid blocks based on the Voronoi tessellation, and the continuum Mohr–Coulomb material represented the surrounding clay. The numerical...
Article
Full-text available
The bearing mechanism of the isolated stone column in soft soil is a complex problem involving interactions of the granular material constituting the column and the surrounding soil. The existing ultimate bearing capacity prediction formulas may be limited in extremely soft soils. A series of numerical simulations were conducted to study the isolat...
Article
Full-text available
Landslide susceptibility mapping (LSM) is a cost-effective tool for landslide hazard mitigation. To date, no nationwide landslide susceptibility maps have been produced for the entire Kenyan territory. Hence, this work aimed to develop a landslide susceptibility map at the national level in Kenya using the fuzzy analytic hierarchy process method. F...
Article
Full-text available
The relationship between moisture transportation and efflorescence in sodium hydroxide- or sodium silicate-activated fly ash/slag geopolymers was investigated. The results show that the efflorescence products are sodium carbonate hydrates, mainly composed of natron, heptahydrate, trona and sodium carbonate. The efflorescence induces compressive str...
Article
Full-text available
In order to improve the theoretical strictness and expand the applied range of the traditional earth pressure calculation methods, a new analytical solution for the active earth pressure distribution of the cohesionless backfill soil has been established. The curved trajectory of minor principal stress in the backfill is adopted in the proposed ana...
Article
Full-text available
The geotextile encased stone column has been numerically modeled with the DEM gravel specimen wrapped by the finite-element shell structure. The irregular shape and size distribution of gravels have been simulated according to the experimental data using the rigid block module in PFC. The geotextile encasement has been modeled using the geogrid ele...
Article
Full-text available
This paper investigates the failure processes of recycled aggregate concrete by a model test and numerical simulations. A micromechanical numerical modeling approach to simulate the progressive cracking behavior of the modeled recycled aggregate concrete, considering its actual meso-structures, is established based on the discrete element method (D...
Article
Full-text available
Different from traditional stone columns, the geotextile wrapped stone column shows more complex behaviors related to the interaction between the stone column and geotextile. In order to study the strength and deformation behaviors of wrapped stone columns, the uniaxial and triaxial compression tests on the geotextile wrapped stone column were nume...
Article
Full-text available
To develop a unified creep model, the complete creep process of rock is divided into the deceleration region and acceleration region based on the typical deformation characteristics and mechanism of the rock creep behavior. By introducing the time-hardening theory and the damage theory, the analytical solutions of creep strengthening and weakening...
Article
Full-text available
The DEM 3-FDM numerical simulation was conducted to investigate the failure process and the bearing mechanism of the 6 single stone column in soft soil beneath rigid loading. The stone column was modeled by discrete rigid blocks, and the surrounding 7 soil was represented using the Mohr-Coulomb constitutive model. The settlement, bulging deformatio...
Article
Full-text available
A series of DEM-FDM coupled numerical simulations were performed to study the failure process of the isolated stone column in soft soil according to the Universal Distinct Element Code. In the proposed numerical model, the stone column was represented by a rigid blocky system based on the Voronoi tessellation; the surrounding soil was represented a...
Article
Full-text available
The purpose of this study is to establish a calibration approach for connecting the macro elastic properties and micro contact properties of the DEM model based on Voronoi tessellation method. Analytical solutions were formulated to predict macro elastic properties for the DEM model with regular contact sets. Based on the combination of the analyti...
Article
Full-text available
A 2D DEM-FDM coupled numerical modelling scheme was proposed to simulate a single stone column in soft clay. The discrete granular materials which firm the stone column can be better simulated by the DEM model, which is beyond the capability of continuum approaches. In the proposed numerical model, the stone column was represented by discrete rigid...
Article
Full-text available
This study numerically investigates the failure processes of recycled aggregate concrete (RAC) and natural aggregate concrete (NAC). A two-dimensional simulation based on a discrete-element method (DEM) is conducted with a universal distinct-element code (UDEC) program. RAC is modeled by a combination of rigid Voronoi blocks cemented to each other...
Chapter
Full-text available
Model tests and corresponding numerical analysis have been conducted on the isolated single stone column to study the failure behavior and bulging deformation behavior of the stone columns with and without geosynthetic encasement. The model test results indicate significant improvement in loading capacity of the stone columns due to geosynthetic en...
Article
Full-text available
The coupled discrete-element method-finite difference method (DEM-FDM) numerical modeling scheme was proposed to simulate a single stone column in soft clay according to the Universal Distinct Element Code (UDEC). The discrete granular materials that form a stone column can be better simulated by the DEM model, which extends beyond the capability o...
Article
Full-text available
A constitutive model with capacity to simulate the full deformation and failure process for rocks considering initial compression and residual strength behaviors is discussed in this paper. The rock was assumed to consist of the initial voids portion and the solid skeleton portion. The full deformation model of rocks can be established by the consi...
Article
In this study, a heterogeneous discrete element model of granite was built considering different mineral contacts, different mineral grains, and the percentages of minerals which were obtained from analysis of the gray-scale values of the rock picture. First, the contacts and grains parameters were fixed by simulating triaxial compression and fract...
Article
Full-text available
Biot’s coefficient is a key parameter of poroelastic theory and extensively used to study hydro-mechanical coupled processes in porous materials. It strongly depends on the microstructure of rocks, and is closely related to the damage process (micro-crack initiation, growth and propagation). A series of hydro-mechanical coupled tests on Aue granite...
Article
Full-text available
Rock is a natural heterogeneous material, which consists of different minerals and is characterized by a pronounced microstructure. The micro-mechanisms, which occur during failure process are related in a complex way to the deformability and strength of the mineral grains and the cement, the grain size, grain shape, grain packing and degree of cem...
Article
Full-text available
p In order to investigate the influence of rock transverse anisotropy on failure behavior several groups of Brazilian split tests on slate with influence of different bedding angles were conducted. The calculated tensile strength of slate under different bedding angles were obtained. Numerical Brazilian test model was set up by FLAC3D to obtain str...
Article
Full-text available
In this study pre-failure damage characteristics are investigated by conducting a series of conventional triaxial compression tests and corresponding numerical simulations for granite from Kirchberg (Saxony, Germany). First, lab test results are analysed. For evaluation and prediction of damage in the pre-failure range, damage indices are proposed...
Article
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The understanding of the rock deformation and failure process and the development of appropriate constitutive models are the basis for solving problems in rock engineering. In order to investigate progressive failure behavior in brittle rocks, a modified constitutive model was developed which follows the principles of the continuum damage mechanics...
Article
Full-text available
The dominant anisotropy (foliation and bedding) of geological materials, especially of foliated metamorphic rocks such as slates, gneisses, phyllites or schists, and sedimentary rocks with bedding planes, leads to complex fracture mechanical behavior. A series of Brazilian tests on Mosel slate were conducted considering different foliation-loading...
Article
Full-text available
It is essential for the stability, deformation and life-time analysis in many engineering applications to account for the hydro-mechanical coupling between pore pressure variation and rock deformation. Hydro-mechanical coupled response in a rock is identified as the interaction between the solid phase of the rock material and any interstitial fluid...
Article
Full-text available
In this paper, new experimental results for Eibenstock granite are presented which can be used to complete existing data on the permeability evolution for brittle rocks under triaxial compression. Based on these data a modified elemental constitutive law on the basis of the Hoek–Brown failure criterion is established, which represents strength degr...
Article
Full-text available
Several groups of Brazilian split tests on heterogeneous gneiss considering the effects of different bedding orientations were conducted in order to investigate the influences of anisotropy and heterogeneity on failure behavior of rocks. The tensile strengths of gneiss with bedding structures of different orientations were obtained. The tensile str...

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Projects (4)
Project
This Special Issue welcomes high-quality original research papers, which describe the most significant research in solid waste recycling, the application of green building materials, and the economic construction industry. Potential topics include, but are not limited to, the following: Sustainable or green materials for construction; Energy-saving, economic, and carbon reduction of construction technology; Integrated technique for construction materials, repair, and renovation in sustainable construction; Recycling raw materials (construction and demolition waste, industrial waste) in building materials production; Case studies in sustainable or green construction materials and technology. Submission Deadline: 25 November 2022 https://www.mdpi.com/journal/buildings/special_issues/green_materials_technology_construction Buildings (ISSN 2075-5309) is an international, peer-reviewed, open access journal on building science, building engineering and architecture (IF:2.648, JCR-Q2)