Jian Ji

Jian Ji
Hohai University · Department of Civil Engineering

BSc, MEng, PhD (NTU Singapore)

About

72
Publications
19,201
Reads
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1,144
Citations
Citations since 2016
58 Research Items
1066 Citations
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
Additional affiliations
September 2017 - present
Hohai University
Position
  • Professor
August 2016 - November 2017
Monash University (Australia)
Position
  • Lecturer
Description
  • CIV5887 - Infrastructure rehabilitation and monitoring Master Course Module: Introduction to probability of failure analysis of corroded underground pipelines
April 2014 - December 2017
Monash University (Australia)
Position
  • Research Associate
Education
August 2008 - August 2012
Nanyang Technological University
Field of study
  • Geotechnical Engineering

Publications

Publications (72)
Article
Full-text available
The need for probabilistic slope analysis that takes into account the uncertainty of soil properties has been acknowledged by the geotechnical profession. traditionally, probabilistic slope analysis involves only single-mode failure that is considered based on the critical slip surface. thismay result in underestimating the failure probability. in...
Article
Full-text available
In contrast to the traditional approach that computes the reliability index in the uncorrelated standard normal space (u-space), the reliability analysis that is simply realized in the original space (x-space, non-Gaussian type) would be more efficient for practical use, for example, with the Low and Tang's constrained optimization approach. On the...
Article
The stability evaluation of earth slopes is a common practice in geotechnical designs. To account for uncertain characteristics of soil properties, probabilistic evaluation that requires repeated calculations of factor of safety (FoS) is inevitably encountered. Because FoS for most slopes in practice is computed numerically due to the lack of analy...
Article
The analysis and design of geotechnical engineering inevitably deal with various sources of uncertainties. To further expand the application of reliability methods in geotechnical engineering design works, the inverse reliability algorithm is modified to incorporate unknown geotechnical design parameters in this paper. Based on the established HLRF...
Article
Full-text available
Many landslides are shallow and earthquake is one of the common triggering factors. This study presents upper bound seismic limit analysis of shallow landslides with a novel kinematically admissible translational failure mechanism. The novel failure mechanism consists of a translational component at the mid-slope and two log-spiral rotational compo...
Article
The mechanical behavior of the interfaces between fine sea sand and offshore structure is regarded as a quite important issue that influences the foundation-bearing capacity and structural safety. In this work, by employing a modified shear apparatus with a ring-transparent sample container, a series of interface shear tests were conducted to shed...
Article
Full-text available
Modeling only constitutes one aspect of decision making. The prevailing limitation of applying modeling to practice is the absence of explicit consideration of uncertainties. This review paper covers uncertainty quantification (soil properties, stratification, and model performance) and uncertainty calculation with a focus on how it enhances the ro...
Chapter
The stability charts for static and pseudo-static (PS) stability analysis of homogenous slopes have been widely used for preliminary design work. Based on the concept of a graphical stability chart, this study presents a series of improved stability charts solution based on PS analysis of a wide range of homogeneous slope models with inclination an...
Article
For slopes consist of layered soil profiles, the earthquake-induced deformation may occur in various locations and the slope may exhibit a set of plastic slip surfaces. In this paper, a fully nonlinear coupled sliding displacement model is presented to evaluate the seismic performance of slopes considering multiple slip surfaces. Both the nonlinear...
Article
Full-text available
Seismic slope stability analysis at regional scale (e.g., landslide hazard mapping, infrastructure slope management) is essential in areas that are susceptible to earthquake. Analytical infinite slope model is well suited and widely used for regional analyses which involve hundreds and thousands of slopes. Use of infinite slope model implicitly ass...
Article
The stability charts for static and pseudo-static (PS) stability analysis of homogenous slopes have been widely used for preliminary design work. Based on the concept of a graphical stability chart, where the factor of safety (FoS) is simply a ratio between two lines, this study presents a series of improved stability charts based on limit equilibr...
Article
Full-text available
Landslide is regarded as one of the most prevalent and destroying geological hazards in natural terrain areas. Reliable landslide susceptibility analysis procedures are vital for policymakers to manage the regional-scale landslide risk. In the framework of physically based modelling analysis, the infinite slope model is commonly used to assess the...
Article
Full-text available
The influence of soil heterogeneity on the corrosion of underground metallic pipelines and the resulting evolution of localised corrosion patches were examined. A field-validated multiphysics numerical model coupled with random field realisations of the variables influencing corrosion was used in the investigation. The degree of saturation and satu...
Article
To investigate the two-phase seepage–stress coupling process in fractured porous medium, this study extends the cohesive element-based numerical manifold method (Co-NMM) by incorporating a two-phase seepage–stress coupling model considering the effect of matrix-fracture interface on the two-phase flow and fracture propagation induced by the two-pha...
Article
Defects may appear or further develop in cast iron pipes lined with polymeric liners in the form of surface corrosion pits/patches, through-wall holes, gaps, longitudinal cracks, circumferential cracks and/or failed joints etc. This paper examines the performance of deteriorated cast iron pipes lined with polymeric liners using probabilistic analys...
Article
In recent years, underground pipeline leakage occurs frequently in urban regions, which seriously reduces the soil-structure stability in the vicinity of the leakage. In this paper, a numerical study about pipeline leakage-induced instability of adjacent excavation earth retaining wall (EERW) is carried out. To reflect the phenomenon of soil streng...
Article
Full-text available
Surrogate models are helpful tools to enhance the efficiency for intensive computations of the factor of safety (FoS) in probabilistic slope stability evaluation. This study presents a multilayer perceptron (MLP)-based surrogate model combined with the Monte Carlo simulation (MCS) for system reliability analysis of earth slopes. The MLP-based surro...
Book
Uncertainties are pervasive in geotechnical engineering. Reliability analysis provides a scientific way to characterize, model, and assess the impact of uncertainties in geotechnical engineering. Due to the increase in processing power of personal computers, the field of geotechnical reliability has experienced significant advancements since 1990s....
Article
The mechanical performance of rock mass subjected to the coupled influences of the elevated temperature and in situ stresses has always been a hot topic in underground rock engineering projects. In this study, a thermal-stress-aperture coupled model was first developed and then incorporated into the particle flow code for the coupled thermomechanic...
Article
In view of the shortcomings of current TBM data mining capability and tunnelling parameters optimization of TBM performance prediction as well as the unmanned driving in future, this paper examines the feasibility of least squares support vector machine (LS-SVM) technology in the parameter prediction of TBM tunnelling. Four important parameters inc...
Article
Many uncertainties exist in pile-stabilized slopes which make their design substantially complicated. In this paper, a first-order reliability method (FORM) based on a support vector machine (SVM) and uniform design (UD) is proposed to investigate the reliability of a pile-stabilized slope. A deterministic model considering soil-pile interaction an...
Article
The effect of undrained shear strength profile is an important practical consideration for estimating the bearing capacity of a strip footing placed near slopes or excavations. Previous studies generally assume that the soil strength (cu) is uniform or increases linearly with depth but does not vary in a horizontal direction. However, the horizonta...
Article
Full-text available
In order to maintain the safety of underground constructions that significantly involves geo-material uncertainties, this paper delivers a new framework for conducting reliability-based design (RBD) of shallow tunnel face stability, utilizing a simplified inverse first-order reliability method (FORM). The limit state functions defining the tunnel f...
Article
This paper presents a reliability-based methodology for failure assessment of reinforced rock slopes subjected to bolt corrosion. Strength failure of the rock bolt, bond failure between the rock bolt and the grout and bond failure between the rock and the grout are considered and their load effects are treated as stochastic processes. The failure p...
Article
Earthquake‐induced permanent displacements of slopes are generally evaluated through the simplified sliding block analyses of a singular coherent mass on a predefined failure plane. However, coseismic landslides may exhibit multiple slip surfaces as a result of earthquake shaking. This study presents a generalized seismic sliding analysis using a c...
Article
Full-text available
The use of Newmark permanent displacement to preliminarily evaluate the seismic performance of earth slopes has been well accepted in geotechnical community. Essentially, the seismic displacement would cause slope soil shear strength to reduce, thus causing the slope yield acceleration to degrade during the earthquake shaking. This phenomenon is kn...
Article
The rainfall-induced earth slope instability is time-dependent as a result of the infiltration process. In order to cater for the uncertainty of geo-material parameters, we conduct a time-dependent reliability analysis of the rainfall-induced landslide, which incorporates discretizing the stochastic process of rainfall infiltration, assigning insta...
Article
Post-tensioning technology is widely used in engineering practice. Recent researches showed that post-tensioned (PT) beam-column assemblies are able to enhance the structural capacity against progressive collapse triggered by a column removal scenario (CRS), but the influence of various parameters of post-tensioning on progressive collapse resistan...
Article
In geotechnical engineering, multiple failure modes exist, and any one can contribute to the failure of a system. System reliability is related to both the probability of failure of each failure mode and the correlations between them, which is obviously different from the reliability analysis of a single mode. This paper focuses on system reliabili...
Article
Full-text available
Earthquakes frequently induce landslides and other natural disasters that have a huge impact on human life and properties. In geotechnical engineering, evaluation of the seismic stability of earth slopes has been attracting great research interests. In this regard, the Newmark permanent displacement provides a simple yet effective index of slope co...
Article
Full-text available
With the high demand for construction of tunnels in China’s severe cold regions, the problem of frost heaving has become an important factor that endangers tunnel safety. This paper attempts to investigate the effect of frost heave of cavity water that widely exists in the tunneling engineering on the tunnel stability. According to the actual defor...
Article
Full-text available
Steel bracing is able to improve progressive collapse resistance of reinforced concrete (RC) frames, but the bracing design is typically based on seismic retrofitting or lateral stability. There is no approach for design of steel bracing against progressive collapse. To this end, a retrofitting approach with steel braces is proposed based on analys...
Article
Full-text available
This study proposed a random Smoothed Particle Hydrodynamics method based on the Karhunen–Loève (K-L) expansion, the non-Newtonian fluid model, and the OpenMP parallel framework. Then, the applicability of this method was validated by comparing the generated random field with theoretical result and by simulating the post-failure process of an actua...
Article
This study proposed a Smoothed Particle Hydrodynamics (SPH) model that could consider two types of soils with different viscosities to reveal the flow mechanism of a soft and hard interbedded earth slope. The flow processes of an actual unstable slope in the Lushan hot spring district and the Saleshan landslide were simulated, and the applicability...
Article
At present, a significant proportion of Australia’s ageing water infrastructure is composed of cast-iron pipes. The corrosion of cast-iron pipes is the main triggering factor for Australia’s water industry. It has been found that the failure mode of small diameter water mains (<300 mm external diameters) from Yarra Valley Water is mainly the longit...
Article
In order to advance the reliability analysis of practical engineering problems, a simplified iterative algorithm for forward and/or inverse first-order reliability method (FORM) is presented in this paper. The approach extends the well-known HLRF algorithms that are conventionally formulated in the uncorrelated standard normal space (u-space) into...
Article
Full-text available
The stability of trenches for buried submarine pipelines (TBSPs) during excavation and/or prior to backfilling has not received enough attention in the literature. In this study, the undrained stability of TBSPs in horizontal and inclined seabeds with shear strengths increasing linearly with depth is investigated using the lower and upper bound fin...
Article
The major factors contributing for the longitudinal failures in large-diameter cast iron water pipes are identified as corrosion and internal water pressure. Evidence of deteriorating pipeline integrity due to fluctuations of internal pressure loading was reported. This study aims to investigate the fatigue resistance of cast iron pipes and to iden...
Article
We examine a new continuum micromechanical approach to predicting the macroscopic mechanical responses of Haubourdin chalk under various load conditions. The approach is based on a simple breakage model that accounts for an evolving microstructural degradation through coccosphere crushing with only five physically meaningful parameters and one grad...
Article
Full-text available
To meet the high demand for reliability based design of slopes, we present in this paper a simplified HLRF (Hasofer–Lind–Rackwitz–Fiessler) iterative algorithm for first-order reliability method (FORM). It is simply formulated in x-space and requires neither transformation of correlated random variables nor optimization tools. The solution can be e...
Conference Paper
The first-order reliability method (FORM) can provide useful information such as reliability index and design point for a reliability based design of slopes. Thus practical FORM-based slope reliability analysis is in great demand for practicing engineers. One difficulty for FORM-based slope reliability analysis is that the slope problem can be very...
Article
Pitting/patch corrosion is a major and common cause of leaks and (or) bursts in cast iron (CI) pipes that consist of over 50% of global pipelines. The determination of the remaining life of a CI pipe is a major challenge facing water utilities requiring an estimate of the impact of pitting corrosion on the degradation of structural pipe capacity. T...
Article
Cast iron (CI) pipes were widely installed as water mains and service connections in the last century and still large numbers of CI pipes remain in service. However, many CI pipes are becoming aged and severely corroded, causing frequent pipe leaks and breaks. To better understand the failure mechanism of CI pipes, this paper provides an efficient...
Article
Full-text available
The soil-concrete interface shear strength, although has been extensively studied, is still difficult to predict as a result of the dependence on many factors such as normal stresses, surface roughness, particle sizes, moisture contents, dilation angles of soils, etc. In this study, a well-known rigorous statistical learning approach, namely the le...
Article
Full-text available
A comprehensive investigation of grain effect (size and distribution) in discrete element modelling of intact rock is carefully conducted through simulating Brazilian disc and uniaxial compressive tests on an intact rock using Universal Distinct Element Code. All the investigations are performed based on the same group of material parameters. Six s...
Conference Paper
Cast iron materials were vastly used to fabricate the buried pipelines for water distribution prior to the 1970s in Australia and overseas. Nowadays, there is still a significant amount of ageing cast iron pipes being in service in many water utilities. Cast iron is a brittle material and when large diameter cast iron pipes (diameters above 300mm)...
Article
Full-text available
Based on experimental results of brittle, intact sandstone under uniaxial compression, the micro-parameters were firstly confirmed by adopting particle flow code (Formula presented.). Then, the validation of the simulated models were cross checked with the experimental results of brittle sandstone containing three parallel fissures under uniaxial c...
Article
Full-text available
This paper presents a probabilistic study of the out-plane failure mode of long embankments by first-order reliability method (FORM) and limit equilibrium method (LEM). The uncertainty and longitudinal spatial variability of soils that are deemed the most important factors producing the 3-D failure modes are considered in the probabilistic analysis...
Article
Full-text available
For slope stability analysis, an alternative to the classical limit equilibrium method (LEM) of slices is the shear strength reduction method (SRM), which can be integrated into finite element analysis or finite difference analysis. Recently, probabilistic analysis of earth slopes has been very attractive because it is capable to take the soil unce...
Article
Full-text available
Using the elasto-plastic constitutive model and strength reduction technique, the stability of slopes is analyzed by a finite difference numerical package FLAC version 7.0. Shear strain increment is used to identify the failure zone. Unlike the conventional investigation taking the soil strengths as constant parameters, this study deals with random...
Article
This paper deals with slope reliability analysis incorporating two-dimensional spatial variation. Two methods, namely the method of autocorrelated slices and the method of interpolated autocorrelations, are proposed for this purpose. Investigations are carried out based on the limit equilibrium method of slices. First-order-reliability-method (FORM...

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Projects (3)