Article
Engineering, Civil
Yichuan Li, Rui Pang, Bin Xu
Summary: Slopes are a critical factor in geotechnical engineering projects, and accurately evaluating and predicting their stability is crucial for disaster prevention during seismic activity. Previous studies often described soil deterministically, ignoring the interaction between uncertainty and spatial dimensions. This paper fills this gap by using a lognormal random field to simulate spatial variability, providing practical expressions for cohesion and friction angle under various conditions. The finite element method and effective dynamic reliability calculation method are employed to calculate the safety factor of a 3D slope. Additionally, the generalized probability density evolution method is used to analyze the probability density information of the dynamic slope response and assess the probabilistic influence of soil spatial variability.
Article
Engineering, Mechanical
Jian Ji, Le-Pei Wang
Summary: Efficient reliability methods are crucial for probabilistic analysis involving uncertain factors in engineering practice. This paper proposes a modified weighted uniform simulation (WUS) method, which utilizes Nataf transformation to effectively transform correlated nonnormal random variables into independent standard normal variables, reducing computational burden and improving reliability analysis accuracy.
JOURNAL OF ENGINEERING MECHANICS
(2022)
Article
Engineering, Industrial
Tong Zhou, Yongbo Peng
Summary: In this paper, an efficient reliability method called APCK-PDEM is developed, which combines adaptive Polynomial-Chaos Kriging and probability density evolution method. By proposing the notation of region of interest, this method can accurately estimate the failure probability and has high computational efficiency.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2022)
Article
Computer Science, Interdisciplinary Applications
E. Deng, Xin-Yuan Liu, Yi-Qing Ni, You-Wu Wang, Chen-Yang Zhao
Summary: Foundation soil plays a significant role in the propagation of vibration waves caused by metro trains. The spatial variability of soil properties has a crucial impact on vibration response. This study establishes a coupling model of the metro train-track-shield tunnel-foundation soil using the probability density evolution method and stochastic field theory. The stochastic field is represented by a series of stochastic variables and deterministic space functions through the Karhunen-Loeve Expansion method. The stochastic parameters of the tunnel-foundation soil cross-section are specified to simulate the stochastic field of foundation soil. The ground surface vibration displacement caused by metro trains in shield tunnels is investigated using the probability density evolution method. The analysis of different metro train speeds reveals the upper and lower limits as well as the probability density distribution of ground surface vibration displacement. The results demonstrate that the probability density distribution of ground vibration displacement follows a normal distribution due to the stochastic field of foundation soil. The vibration displacement curve at the inverted arch of the tunnel exhibits peaks and valleys, which are caused by the wheel distance of the metro train. The probability density distribution of velocity and acceleration is more sensitive to the stochastic field of velocity foundation soil and the change in metro train speed. The maximum Z vibration level results under different metro train speeds satisfy the requirements of vibration allowable limits specified.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Civil
Kumar Anjneya, Arghya Deb
Summary: This paper introduces an alternate approach based on the Probability Density Evolution Method (PDEM) for the fast and efficient generation of the Probability Density Function (PDF) of the Discrete Element Method (DEM) model. The approach is demonstrated through a DEM model developed for the slump test, and the results show that PDEM can determine the PDF of the measured response from a limited number of trials, with low dispersion in the DEM results and strong predictive ability.
Article
Engineering, Civil
A. R. Ibrahim, D. A. Makhloof
Summary: The unavoidable heterogeneity in the mechanical characteristics of concrete is crucial to consider in the design of high-rise buildings. This study investigates the spatial variability of material properties and proposes a framework to capture the stochastic response and assess the reliability of structural components. The results demonstrate the importance of accounting for material uncertainty in ensuring the safety of high-rise buildings.
Article
Engineering, Civil
De-Cheng Feng, Si-Cong Xie, Yue Li, Liu Jin
Summary: This paper presents a quantitative study on the influence of corrosion effect on the redundancy of reinforced concrete structures. By introducing a reliability-based redundancy quantification framework and an efficient finite element modeling strategy, the research conducts a case study to demonstrate the capability of the framework in investigating time-dependent reliability and redundancy of the structure. The study reveals the importance of corrosion on the structure redundancy by simulating the deterioration of material properties induced by corrosion and analyzing the impacts of different corrosion modeling assumptions.
Article
Engineering, Geological
Laifu Song, Rui Pang, Bin Xu, Yang Zhou
Summary: The distribution characteristics of rockfill strength parameters play a crucial role in assessing the stability of rockfill dam slopes. In this study, a joint distribution model using the copula function is proposed, and a dynamic reliability analysis method is introduced. The results indicate that the copula theory, the numerical method, and the generalized probability density evolution method provide an effective approach for analyzing the dynamic response and reliability of slope stability.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Engineering, Civil
Seid H. Pourtakdoust, Amir H. Khodabakhsh
Summary: The paper introduces a new deep learning method called DeepPDEM for solving the evolution of probability density. By utilizing the concept of physics-constrained networks, DeepPDEM learns the General Density Evolution Equation of stochastic structures. This method can solve the density evolution problem without prior simulation data and can serve as an efficient surrogate in optimization schemes or real-time applications.
Article
Engineering, Geological
Chunyu Zhang, Jianguo Xu, Yulin Qian, Jinpeng Zhang, Ren Wang, Bo Wang
Summary: Based on concrete continuum damage mechanics and probability density evolution theory, a research model was established to analyze the seismic response and reliability of random parameter structures under random ground motions. The study found that compound random actions can amplify seismic responses and reduce the seismic reliability of structures. The proposed analysis framework and method provide an important reference for seismic analysis and reliability analysis of structures.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Mohsen Rashki
Summary: This study introduces a new probability concept, random probability density function (PDF), as an efficient alternative to random sampling for probability/reliability analysis of multivariate problems. By drawing a few random PDFs instead of millions of random samples, accurate and efficient statistical moment estimation and reliability analysis of multivariable problems can be achieved.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Engineering, Multidisciplinary
Meng-Ze Lyu, De-Cheng Feng, Jian-Bing Chen, Jie Li
Summary: This paper proposes a new method based on the principle of preservation of probability for determining the joint probability density function (PDF) of multiple responses. It reduces the computational complexity of high-dimensional stochastic dynamical systems by transforming the multi-dimensional partial differential equations into one-dimensional equations.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2024)
Article
Engineering, Industrial
Tong Zhou, Yongbo Peng
Summary: The AEM-PDEM method combines an ensemble of metamodels and probability density evolution method to improve accuracy and efficiency. In three numerical examples, AEM-PDEM shows significant reduction in computational time compared to existing methods.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2022)
Article
Engineering, Mechanical
Jingran He, Ruofan Gao, Hao Zhou
Summary: In engineering practice, the seismic reliability of high-rise reinforced concrete structures is often evaluated using probabilistic modeling of material properties. However, the availability of measured material parameter data is usually insufficient for accurate probability modeling, particularly in situations involving spatial variability. Traditional parametric reliability analysis methods may be biased for such problems. Therefore, a nonparametric seismic reliability analysis method is proposed based on the Bayesian compressive sensing - stochastic harmonic function method and the probability density evolution method. This method utilizes conditional random fields to represent the material properties of concrete and analyzes the seismic reliability of a high-rise reinforced concrete shear wall model structure using the probability density evolution method.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Jiashu Yang, Jianbing Chen, Hector Jensen
Summary: This study investigates the feasibility of solving dynamic-reliability-based design optimization problems using the probability density evolution method (PDEM). The PDEM combined with extreme value distribution strategy is used for dynamic reliability assessment. Representative points that have a significant impact on dynamic reliability are identified, and sensitivity analysis is performed using these points. The proposed method efficiently solves the design optimization problem under dynamic reliability constraints by embedding the PDEM-based assessment into first-order optimization algorithms. Numerical examples demonstrate the effectiveness and efficiency of the method.
PROBABILISTIC ENGINEERING MECHANICS
(2022)
Review
Engineering, Civil
Yu Huang, Bei Zhang
Summary: Flow-structure interaction is crucial for preventing geo-disasters, and physical modeling is challenging due to complex rheology, transient nature, and nonlinear response. Hierarchical scaling and coupled modeling are recommended to address key issues, while investigating the impact of Coriolis effect. Robust numerical tools are also recommended for experiment design and mechanism exploration.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Yu Huang, Bei Zhang
Summary: Debris-flow disaster has caused significant casualties and economic losses. The design strategy for disaster prevention should focus on improving impact force estimation, run-up height prediction, failure analysis, and plain configuration planning. Current methods mostly rely on hydraulic theory, lacking consideration for physical mechanisms, such as nonstationary flow regimes, impact patterns, and barrier characteristics. Physically based design strategies and robust physical modeling methods and numerical simulation tools are needed to understand flow-structure interaction mechanisms and verify structure design strategies. Additionally, the resilience-based disaster prevention concept should be emphasized for effective preparedness, response, and recovery.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Geological
Liuyuan Zhao, Yu Huang
Summary: Experiments were conducted to study the dynamic and thermal characteristics of rockslide motion utilizing a model slope with sliding blocks of varying parameters. Impact heating was found to be substantially higher than frictional heating, with factors such as velocity, contact stiffness, and mass of the sliding block affecting temperatures during sliding. The rapid dissipation of impact heat within a short time frame provides meaningful information for disaster prevention measures and studies on landslides.
Article
Geosciences, Multidisciplinary
Xi Xu, Yu Huang, Yuanchuang Xing, Zhen Guo
Summary: This study investigated the control factors of toe-cut slope failure in the southeastern coastal region of China, identifying both external and internal factors affecting slope stability. Numerical simulations revealed a retrogressive failure mechanism of toe-cut slopes under rainfall conditions.
Editorial Material
Environmental Sciences
Yu Huang, Jin Sun, Chongqiang Zhu
Article
Environmental Sciences
Hao Shi, Yu Huang
Summary: This article describes a multiphase extension of the delta-plus-SPH model for modeling non-Newtonian multiphase flow. Modifications are made to improve the accuracy and stability, including a modified numerical diffusive term and a special shifting treatment near the phase interface. The Herschel-Bulkley model is used to describe non-Newtonian fluids, and a sub-particle term is added in the momentum equation for large eddy simulation. The GPU acceleration technique is applied for computational efficiency. Tests show that the proposed SPH model can accurately capture highly transient incompressible two-phase flows with consistent pressure across the interface.
Article
Computer Science, Interdisciplinary Applications
Yu Huang, Zhengying He, Atsushi Yashima, Zhiyi Chen, Chunxiang Li
Summary: A framework for multi-objective optimization design of Pile-anchor structures (PAS) in slopes is proposed in this study, considering the uncertainty of soil properties. The framework incorporates reliability theory and Monte Carlo simulations to account for the spatial variability of soil properties. An illustrative example demonstrates that the optimal PAS design achieves minimum failure probability and lowest total cost.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Bei Zhang, Yu Huang
Summary: This study investigates the impact dynamics of granular flows against a baffle array and proposes a jet-based model for baffle design. The results show that the energy loss due to interparticle interaction increases with the Froude number and the hard contact of larger particles and the arching effect of debris-baffle interaction are important to impact dynamics on baffle structure.
Article
Engineering, Geological
Suran Wang, Yu Huang
Summary: This study investigated the evolution of shear characteristics of quartz sand subjected to high temperatures in long-runout landslides. The results revealed that high temperature exposure caused the quartz sand to easily break and undergo density changes. Additionally, particle size had a significant impact on the residual shear stress and shear stress fluctuation amplitude, while the presence of copper-gold-iron in the samples after heat treatment had adverse effects on the shear properties of the sand.
Article
Geosciences, Multidisciplinary
Hualin Cheng, Martin Mergili, Yu Huang
Summary: This study uses a numerical model to analyze the flow and sediment erosion processes of debris flows. The results show that the erosion models accurately predict the movement and channel erosion of the debris flows, and the most serious sediment erosion occurs along the sides of the channels. In addition, the model is applied to predict the dynamical behavior and bulking process of a specific debris flow, showing an increase in discharge and hazard intensity due to sediment erosion. This study provides more scientific basis for risk assessment and hazard mitigation of large-scale debris flows in mountainous areas.
Article
Geosciences, Multidisciplinary
Yu Huang, Hao Shi, Bei Zhang
Summary: In mountainous areas, rock avalanches can cause large impact forces on structures. Baffle systems are commonly used in torrent channels to dissipate flow energy and minimize destructive effects. This paper presents a crown-like baffle system that effectively dissipates flow energy through particle-particle interaction. The results show that the proposed baffle system can reduce the residual kinetic energy by up to 18.75% compared to a conventional baffle system, making it a cost-effective solution.
JOURNAL OF EARTH SCIENCE
(2023)
Article
Engineering, Geological
Yu Huang, Boyu Fu, Zhen Guo, Atsushi Yashima
Summary: In this paper, a modified deformation coordination model is proposed to accurately calculate the internal force of anchored piles. The interaction between the anchor and pile is divided into two stages: the application of prestressed anchor cables and the action of landslide thrust. Using the virtual work principle and graph multiplication theory, a deformation coordination equation is established and the calculation formula for anchor cable tensile stress is obtained. An engineering case study demonstrates the capability of the proposed model to calculate the internal force of anchored piles.
SOILS AND FOUNDATIONS
(2023)
Article
Engineering, Geological
Yu Huang, Zhengying He
Summary: This study proposes a novel methodology for implementing rainfall-resilient design for slope systems by combining the resilience design philosophy and stability analysis. The design-oriented resilient criterion and recovery strategies for slope systems are analyzed and compared with traditional design criteria. This rainfall-resilient design can effectively support landslide mitigation in the coastal area of Southeast China.
SOILS AND FOUNDATIONS
(2023)
Article
Computer Science, Interdisciplinary Applications
Dianlei Feng, Can Yi, Man Hu, Tao Gao, Yu Huang
Summary: In this study, a new soil turning numerical model based on the SPH method has been proposed, and an elastoplastic constitutive model has been implemented. The model was validated through a landslide benchmark test and a combined experimental numerical investigation on the soil turning process. The results show that the proposed SPH model can accurately reproduce the soil turning process.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Civil
Chongqiang Zhu, Hualin Cheng, Yangjuan Bao, Zhiyi Chen, Yu Huang
Summary: This study investigated the effects of horizontal pulse-like motion and vertical component on the dynamic response of slopes through shaking table tests. The results showed that the vertical component has limited influence on seismic response under pulse-like ground motion, but it greatly enhances the response under ordinary horizontal motion. It is important to pay attention to vertical ground motion, especially when its horizontal component is ordinary ground motion.
GEOMECHANICS AND ENGINEERING
(2022)
