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学者姓名：路德春
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Abstract ：
Discrete Element Method (DEM) can well simulate the failure of geomaterials, but it is challenging to evaluate its stable degree and failure state. An approach for calculating the equivalent Cauchy stress field in both regular and irregular DEM models is proposed by establishing a local equivalent element for each particle. Meanwhile, the relationship between the stress ratio path during geomaterial failure and the macro strength criterion is analyzed, and then, a new evaluation index named SFSRP is proposed. Combining the equivalent Cauchy stress and the SFSRP, a method that can evaluate the stable degree and failure state of the geomaterial is established. Finally, the proposed method is implemented to analyze the failure process in four typical cases, including a trapdoor test, a retaining wall test, a tunnel excavation test, and a biaxial compression test, based on PFC2D. The results demonstrate that the proposed method not only presents the failure location intuitively but also quantitatively reflects the stable degree and failure state in the DEM model.
Keyword ：
DEM DEM Stress ratio path Stress ratio path Failure evaluation Failure evaluation Equivalent Cauchy stress Equivalent Cauchy stress Geomaterial failure Geomaterial failure
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| GB/T 7714 | Dong, Hongyu , Lin, Qingtao , Lu, Dechun et al. A method for evaluating the failure state of geomaterials in DEM by introducing equivalent Cauchy stress and macro strength criterion [J]. | COMPUTERS AND GEOTECHNICS , 2025 , 182 . |
| MLA | Dong, Hongyu et al. "A method for evaluating the failure state of geomaterials in DEM by introducing equivalent Cauchy stress and macro strength criterion" . | COMPUTERS AND GEOTECHNICS 182 (2025) . |
| APA | Dong, Hongyu , Lin, Qingtao , Lu, Dechun , Zhang, Fujun , Du, Xiuli . A method for evaluating the failure state of geomaterials in DEM by introducing equivalent Cauchy stress and macro strength criterion . | COMPUTERS AND GEOTECHNICS , 2025 , 182 . |
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Abstract ：
A model is proposed to describe the soil movement caused by tunnel excavation. The mathematical relationships for soil displacement in both the horizontal and vertical directions are established. An optimized Gaussian function is developed to accommodate various ground conditions for describing vertical displacement, then, a formula for horizontal displacement is derived on this basis, providing a unified calculation method for both vertical and horizontal displacements. Utilizing the principles of elastic-plastic mechanics, the vertical and horizontal strains of soil are obtained by solving the first-order partial derivative of the displacement formulas. Subsequently, formulas for volume strain and engineering shear strain are derived using the Mohr strain circle. The validity of the displacement and strain formulas is confirmed through comparison with measured results from sandy strata (4 sets) and clay strata (2 sets). In conclusion, a comprehensive empirical framework for analyzing ground disturbance caused by tunnel excavation is established. The method relies on just two parameters and four known quantities, making it convenient for practical engineering.
Keyword ：
Engineering shear strain Engineering shear strain Mohr strain circle Mohr strain circle Ground displacement Ground displacement Volume strain Volume strain Tunnel excavation Tunnel excavation
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| GB/T 7714 | Lin, Qingtao , Song, Tao , Lu, Dechun et al. A novel analytical method for describing ground motion behaviour caused by tunnel excavation [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2025 , 161 . |
| MLA | Lin, Qingtao et al. "A novel analytical method for describing ground motion behaviour caused by tunnel excavation" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 161 (2025) . |
| APA | Lin, Qingtao , Song, Tao , Lu, Dechun , Du, Xiuli . A novel analytical method for describing ground motion behaviour caused by tunnel excavation . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2025 , 161 . |
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Abstract ：
This study provides semi-analytical solutions for the cylindrical cavity expansion (CCE) problem, utilizing the non-orthogonal elastoplastic clay (NEPC) model. The analysis covers both undrained and drained scenarios. The NEPC model captures the soil's softness/hardness and volume change behavior using only a fractional order parameter, without requiring an additional plastic potential function. After a brief introduction to the NEPC model, we derive solutions by solving a system of closed-form ordinary differential equations that involve the material derivative of effective stresses. The presented semi-analytical solutions are validated through finite element (FE) solutions which are obtained on an implicit unconstrained stress update algorithm. The impact of the fractional order on the expansion process is analyzed and discussed in depth, covering the normal and overconsolidated soils. The presented solutions provide a framework for analyzing CCE in clay, considering the softness/hardness and volume change behavior of the soil, and can act as a benchmark for validating numerical solutions for non-orthogonal elastoplastic models.
Keyword ：
Non-orthogonal flow rule Non-orthogonal flow rule Elastoplastic model Elastoplastic model Semi-analytical solution Semi-analytical solution Cylindrical cavity expansion Cylindrical cavity expansion Soil Soil
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| GB/T 7714 | Lu, Dechun , Chen, Yun , Zhou, Xin et al. Cylindrical cavity expansion solutions using the non-orthogonal elastoplastic clay model [J]. | COMPUTERS AND GEOTECHNICS , 2025 , 183 . |
| MLA | Lu, Dechun et al. "Cylindrical cavity expansion solutions using the non-orthogonal elastoplastic clay model" . | COMPUTERS AND GEOTECHNICS 183 (2025) . |
| APA | Lu, Dechun , Chen, Yun , Zhou, Xin , Du, Xiuli . Cylindrical cavity expansion solutions using the non-orthogonal elastoplastic clay model . | COMPUTERS AND GEOTECHNICS , 2025 , 183 . |
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Abstract ：
The peridynamic method has emerged as an invaluable tool for studying the cracking and failure mechanisms in reinforced concrete structures. Original peridynamic motion equations and parameters are derived based on the energy equations for homogeneous materials, which inadequately address the complex interactions at interfaces of heterogeneous materials. This study proposes a refined interaction model for material points in the interface region, grounded in the bond-slip mechanism of steel-to-concrete interfaces. An interface viscoelastic peridynamic method for reinforced concrete is developed by combining the previously proposed viscoelastic model. The micro-elastic parameters of the interface are determined by the energy density equivalence between peridynamics and continuum mechanics. The equivalence between the horizon radius and the confined wedge radius is rigorously established by analyzing the stress distribution in the concrete confined by steel ribs. The critical stretch constant is determined based on the peak stress of the interfacial bond-slip curve. Validation against pull-out tests on four groups of reinforced concrete specimens demonstrates the accuracy of the developed interface peridynamic method. Further numerical tests on reinforced concrete members under various conditions show that the proposed peridynamic method accurately captures the effects of rebar diameter, concrete strength, anchorage length, rib spacing, and loading rate on the bond behavior at the reinforced concrete interface.
Keyword ：
Interfacial interaction model Interfacial interaction model Failure analysis Failure analysis Bond-slip mechanism Bond-slip mechanism Viscoelastic peridynamics Viscoelastic peridynamics
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| GB/T 7714 | Wang, Guosheng , Lu, Dechun , Gao, Yixin et al. Viscoelastic peridynamic method for the interface in the reinforced concrete [J]. | ENGINEERING FRACTURE MECHANICS , 2025 , 315 . |
| MLA | Wang, Guosheng et al. "Viscoelastic peridynamic method for the interface in the reinforced concrete" . | ENGINEERING FRACTURE MECHANICS 315 (2025) . |
| APA | Wang, Guosheng , Lu, Dechun , Gao, Yixin , Xie, Zengxun , Du, Xiuli . Viscoelastic peridynamic method for the interface in the reinforced concrete . | ENGINEERING FRACTURE MECHANICS , 2025 , 315 . |
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Abstract ：
Leakage between adjacent lining blocks can cause severe secondary accidents, necessitating prompt joint inspection and repair. This study introduces an innovative framework to evaluate leakage of tunnel lining joints quantitatively. First, an enhanced two-stage detection model is proposed and utilised to predict joint bounding boxes. A novel backbone integrating Swin Transformer and sandglass blocks is used to capture both holistic and regional features. After the leakage joints are detected and located, leakage in the images is segmented based on the threshold algorithm, where a process containing image morphology algorithms is designed to enhance the quality and reasonability of the leakage masks. According to the characteristics of shield tunnels, the quantitative assessment method is proposed to obtain the areas of leakage regions. The mAP50-95 of the proposed detector improves by 5.7% to 8.9% compared to previous methods, while the FPS reaches 15.68. The proposed method performs well on images larger than 400 x 400 pixels, and the AP50 can exceed 80%. For the segmentation method, most IoUs between the manual and segmented masks are larger than 0.7. Thresholds specified in the Chinese standards are used to evaluate the leakage condition of an on-site tunnel, and maintenance guidance is given.
Keyword ：
lining joint detection lining joint detection leakage quantification leakage quantification threshold-based segmentation threshold-based segmentation Shield tunnel Shield tunnel dual-branch backbone dual-branch backbone
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| GB/T 7714 | Ma, Yiding , Lu, Dechun , Kong, Fanchao et al. An intelligent detection method for precise analysis of shield tunnel lining joints based on deep learning networks and image morphology algorithms [J]. | GEORISK-ASSESSMENT AND MANAGEMENT OF RISK FOR ENGINEERED SYSTEMS AND GEOHAZARDS , 2025 . |
| MLA | Ma, Yiding et al. "An intelligent detection method for precise analysis of shield tunnel lining joints based on deep learning networks and image morphology algorithms" . | GEORISK-ASSESSMENT AND MANAGEMENT OF RISK FOR ENGINEERED SYSTEMS AND GEOHAZARDS (2025) . |
| APA | Ma, Yiding , Lu, Dechun , Kong, Fanchao , Li, Shaohua , Zhou, Annan , Du, Xiuli . An intelligent detection method for precise analysis of shield tunnel lining joints based on deep learning networks and image morphology algorithms . | GEORISK-ASSESSMENT AND MANAGEMENT OF RISK FOR ENGINEERED SYSTEMS AND GEOHAZARDS , 2025 . |
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Abstract ：
To address the challenge of modelling intricate crack patterns in brittle materials, this study introduces a novel damage framework with thermo-mechanical coupling. By integrating thermal effects within a unified energy variational framework, the model incorporates an innovative damage variable that explicitly accounts for thermal deformation and accurately characterises the topology of thermal cracks. The explicit thermo-damage variable and governing equations are directly derived from the variational functional, enabling efficient resolution of thermal fracture problems by focusing solely on displacement and temperature fields. Furthermore, the proposed framework demonstrates the potential for extension to other multi-field coupled fracture problems driven by environmentally induced strain. A series of simulations, including purely mechanical as well as 2D and 3D thermo-mechanical scenarios, validate the model's capability to effectively capture intricate crack behaviours.
Keyword ：
Crack propagation Crack propagation Fracture Fracture Thermo-mechanical coupling Thermo-mechanical coupling Damage Damage Multi-field Multi-field
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| GB/T 7714 | Su, Cancan , Lu, Dechun , Zhuang, Xiaoying et al. A thermo-mechanical damage model for thermal crack propagation in brittle materials [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2025 , 138 . |
| MLA | Su, Cancan et al. "A thermo-mechanical damage model for thermal crack propagation in brittle materials" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 138 (2025) . |
| APA | Su, Cancan , Lu, Dechun , Zhuang, Xiaoying , Rabczuk, Timon , Zhou, Xin , Du, Xiuli . A thermo-mechanical damage model for thermal crack propagation in brittle materials . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2025 , 138 . |
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Abstract ：
Cohesion provided by pore ice is a critical component influencing the mechanical behavior of frozen soil, as it not only cements soil particles together but also shares the external loads with them. In view the crucial role of cohesion in developing an elastoplastic model for frozen soil, this paper employs triaxial tensile strength (TTS) to characterize cohesion and proposes a TTS degradation expression driven by plastic shear strain. By directly incorporating TTS into the yield function, a framework for a Non-Orthogonal Elastoplastic (NOEP) constitutive model that accounts for cohesion degradation in frozen soil is developed. Furthermore, a hardening parameter incorporating TTS is introduced and used in conjunction with the modified yield function to determine the magnitude of the plastic strain increment. The non-orthogonal plastic flow rule is used to determine the direction of the plastic strain increment based on the modified yield function. Ultimately, by combining the elastic strain increment determined by Hooke's rule, a NOEP constitutive model incorporating cohesion degradation for frozen soil is established. The validity and rationality of the proposed NOEP model in representing the stress-strain relationship of frozen soil are confirmed through comparisons with test results of frozen soil under the triaxial compression conditions. The proposed constitutive model provides a more comprehensive and precise representation of frozen soil's response to external loading, enhancing the understanding of its shear deformation behavior and providing a robust theoretical foundation for engineering design and construction in cold regions.
Keyword ：
Hardening parameter Hardening parameter Constitutive model Constitutive model Cohesion Cohesion Non-orthogonal plastic flow rule Non-orthogonal plastic flow rule Frozen soil Frozen soil
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| GB/T 7714 | Liang, Jingyu , Li, Haowen , Qi, Jilin et al. A non-orthogonal elastoplastic constitutive model incorporating cohesion degradation for frozen soil [J]. | COMPUTERS AND GEOTECHNICS , 2025 , 183 . |
| MLA | Liang, Jingyu et al. "A non-orthogonal elastoplastic constitutive model incorporating cohesion degradation for frozen soil" . | COMPUTERS AND GEOTECHNICS 183 (2025) . |
| APA | Liang, Jingyu , Li, Haowen , Qi, Jilin , Lu, Dechun . A non-orthogonal elastoplastic constitutive model incorporating cohesion degradation for frozen soil . | COMPUTERS AND GEOTECHNICS , 2025 , 183 . |
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Abstract ：
The complex tunnel lighting condition affects the image-capturing process, leading to motion blurs affecting the segmentation accuracy for tunnel leakage objects. To address the abovementioned limitations, a novel two-phase segmentation method for blurry images involving the SRN-DeblurNet and the improved YOLO v8 segmentation network is proposed. The corresponding deblurred images are restored based on the multi-scale features of blurry images. Subsequently, the leakage features are extracted from the deblurred images, and the segmentation masks are predicted. The dataset construction processes are designed to train the proposed method step by step. The motion blur patterns of tunnel images are proposed to generate training and test images. After the deblurring process, the clarity improvements of the tunnel lining images are analyzed, while the quality change is discussed. The deblurred images are segmented by the improved YOLO v8 segmentation network, and the results of YOLO v8 on test datasets are illustrated. By comparing the segmentation results of blurry and deblurred images, the effectiveness of the proposed method is analyzed in detail. Ablation studies are conducted to evaluate the trainability and the efficiency of the proposed method. Results present the effectiveness of the proposed method in mitigating motion blur challenges in tunnel inspection.
Keyword ：
deep learning deep learning semantic segmentation semantic segmentation lining leakage lining leakage blind image deblurring blind image deblurring Metro tunnels Metro tunnels
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| GB/T 7714 | Ma, Yiding , Kong, Fanchao , Lu, Dechun et al. An intelligent method for apparent water leakage segmentation of tunnel lining images considering motion blurs [J]. | GEORISK-ASSESSMENT AND MANAGEMENT OF RISK FOR ENGINEERED SYSTEMS AND GEOHAZARDS , 2025 . |
| MLA | Ma, Yiding et al. "An intelligent method for apparent water leakage segmentation of tunnel lining images considering motion blurs" . | GEORISK-ASSESSMENT AND MANAGEMENT OF RISK FOR ENGINEERED SYSTEMS AND GEOHAZARDS (2025) . |
| APA | Ma, Yiding , Kong, Fanchao , Lu, Dechun , Lin, Weipeng , Zhang, Dongmei , Du, Xiuli . An intelligent method for apparent water leakage segmentation of tunnel lining images considering motion blurs . | GEORISK-ASSESSMENT AND MANAGEMENT OF RISK FOR ENGINEERED SYSTEMS AND GEOHAZARDS , 2025 . |
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Abstract ：
An empirical model for describing the soil movements induced by tunneling is proposed, then the mathematical relationship between horizontal displacement and vertical displacement is obtained. By analyzing 25 sets of data from field engineering and 35 sets of data from model tests, the formula for the maximum settlement Sv, max(z) is optimized to adapt to different ground conditions. The Modified Gaussian function is developed by introducing the existing width coefficient of the settlement trough i(z) and the optimized Sv, max(z) to describe the surface and subsurface vertical displacement. Subsequently, the formula for the horizontal displacement is derived based on the Modified Gaussian function. H(z) representing the position of the oriented point of the soil movement is a variable in the formula for horizontal displacement. Based on measured results, a logarithmic function and a quadratic polynomial function are proposed to describe the variation of H(z) with depth in the clay stratum and sand stratum, respectively. Then, the rationality of the proposed method is validated by 4 sets of in-situ data and 4 sets of test data. Finally, the implementation process of the proposed method is illustrated, and the inversion results of the ground displacement field in Beijing Metro Line 12 are presented.
Keyword ：
vertical displacement vertical displacement empirical method empirical method horizontal displacement horizontal displacement Modified Gaussian function Modified Gaussian function tunnel excavation tunnel excavation
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| GB/T 7714 | Lin, Qingtao , Meng, Xu , Lu, Dechun et al. A unified empirical method for predicting both vertical and horizontal ground displacements induced by tunnel excavation [J]. | CANADIAN GEOTECHNICAL JOURNAL , 2024 , 61 (7) : 1468-1495 . |
| MLA | Lin, Qingtao et al. "A unified empirical method for predicting both vertical and horizontal ground displacements induced by tunnel excavation" . | CANADIAN GEOTECHNICAL JOURNAL 61 . 7 (2024) : 1468-1495 . |
| APA | Lin, Qingtao , Meng, Xu , Lu, Dechun , Miao, Jinbo , Zhao, Zhihong , Du, Xiuli . A unified empirical method for predicting both vertical and horizontal ground displacements induced by tunnel excavation . | CANADIAN GEOTECHNICAL JOURNAL , 2024 , 61 (7) , 1468-1495 . |
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Abstract ：
The accuracy of a constitutive model for confined concrete largely relies on its capability to capture concrete's dilatancy behavior. In this paper, a non -orthogonal flow rule (NFR) is used to reasonably characterize the concrete's volume change law in relation to the stress state without the necessity for a plastic potential function. Then, the non -orthogonal plastic model is implemented in the finite element (FE) software ABAQUS using the implicit stress update algorithm, which employs the line search method and the numerical consistent tangent stiffness matrix to ensure the robustness and computational efficiency of FE analysis. Finally, FE simulations are performed to evaluate the constitutive model's capabilities in actively and passively confined concrete. In the latter case, steel tubes restrict the concrete's lateral deformation. An analysis and discussion are conducted regarding the impact of dilatancy behavior on concrete -filled steel tube (CFST) columns. The consistency between experimental data and simulation results demonstrates that the FE modeling with a non -orthogonal constitutive model provides an effective tool to describe the behavior of confined concrete.
Keyword ：
Constitutive model Constitutive model Finite elements Finite elements Numerical implementation Numerical implementation Confined concrete Confined concrete
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| GB/T 7714 | Meng, Fanping , Lu, Dechun , Wang, Shanyong et al. Modeling confined concrete behavior in finite element with a non-orthogonal elastoplastic model [J]. | ENGINEERING STRUCTURES , 2024 , 312 . |
| MLA | Meng, Fanping et al. "Modeling confined concrete behavior in finite element with a non-orthogonal elastoplastic model" . | ENGINEERING STRUCTURES 312 (2024) . |
| APA | Meng, Fanping , Lu, Dechun , Wang, Shanyong , Zhou, Xin , Du, Xiuli . Modeling confined concrete behavior in finite element with a non-orthogonal elastoplastic model . | ENGINEERING STRUCTURES , 2024 , 312 . |
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