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学者姓名：戴自航
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Abstract ：
Currently, most studies on slope stability either neglect or consider only one of the two critical factors-rainfall conditions and crack state-that influence the stability of recent landslides. To address this limitation, eleven parameters, including slope height, internal friction angle, cohesion, rainfall conditions, and crack state, were selected as evaluation indexes. GeoStudio software 2018 R2 was also used to simulate the slope safety factor under various parameters, and 363 datasets were obtained. The eXtreme Gradient Boosting-Particle Swarm Optimization-Support Vector Regression (XGBoost-PSO-SVR) model was employed to train the simulation results and construct a predictive model. The MSE of XGBoost-PSO-SVR when compared with the MSE of the single-machine methods of XGBoost and PSO-SVR is reduced by 71.9% and 57.8%, respectively. Furthermore, when compared with four single-machine models-Decision Tree (DT), Naive Bayes (NB), Random Forest (RF), and K-Nearest Neighbors (KNN)-the XGBoost-PSO-SVR model had the smallest MSE of 0.0016 and the largest R2 of 0.9919. Thus, the XGBoost-PSO-SVR model demonstrated superior training performance. The predicted safety factor for a recent landslide in Yongchun County, Fujian Province, China, during 4-7 November 2016 was 0.9658, which closely aligned with the actual conditions. This study could provide a new method for the stability prediction of recent landslides based on various factors, such as rainfall conditions and crack state.
Keyword ：
rainfall rainfall recent landslide recent landslide red clay red clay safety factor safety factor XGBoost-PSO-SVR model XGBoost-PSO-SVR model
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| GB/T 7714 | Chen, Zhongyuan , Dai, Zihang , Guo, Lingteng et al. Stability Analysis of Recent Failed Red Clay Landslides Influenced by Cracks and Rainfall Based on the XGBoost-PSO-SVR Model [J]. | WATER , 2025 , 17 (13) . |
| MLA | Chen, Zhongyuan et al. "Stability Analysis of Recent Failed Red Clay Landslides Influenced by Cracks and Rainfall Based on the XGBoost-PSO-SVR Model" . | WATER 17 . 13 (2025) . |
| APA | Chen, Zhongyuan , Dai, Zihang , Guo, Lingteng , Fang, Weiguo . Stability Analysis of Recent Failed Red Clay Landslides Influenced by Cracks and Rainfall Based on the XGBoost-PSO-SVR Model . | WATER , 2025 , 17 (13) . |
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Currently, the internal forces of raft foundations are generally calculated by the rigid strip method without considering the soil-structure interaction. To overcome the problem, the elastic foundation plate method arose, but most applications are based on the single-parameter Winkler foundation model. Recently, Worku and Seid proposed a Kerr-equivalent Pasternak two-parameter foundation model that belongs to the continuum model and possesses the same precision as the solid finite-element model. While the authors found that their two parameters formulations are inacurrate. For that, two calibration factors were introduced. Based on the soil's deformation modulus determined by the plate load test, the approach to accurately determining the two parameters was obtained. The finite-difference method was established, and the corresponding program was developed by using Matlab. The application of the Pasternak model in the design calculation of a practical raft foundation was given for the first time. The results agreed well with those of the finite-element method, which validated the reliability. The rebar configuration according to the internal forces computed by the proposed method is more reliable than that of the existing method. As a result, the proposed method can prominently enhance the reliability in computing the internal forces and reinforcement of raft foundations.
Keyword ：
Finite-difference method Finite-difference method foundation model foundation model Internal force Internal force Kerr-equivalent Pasternak two-parameter Kerr-equivalent Pasternak two-parameter Raft foundation Raft foundation Rigid strip method Rigid strip method
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| GB/T 7714 | Dai, Zi-Hang , Du, Yan-Rui , Xu, Dan et al. Calculations of internal forces and rational reinforcement of raft foundation resting on Kerr-equivalent Pasternak ground [J]. | COMPUTERS & STRUCTURES , 2025 , 316 . |
| MLA | Dai, Zi-Hang et al. "Calculations of internal forces and rational reinforcement of raft foundation resting on Kerr-equivalent Pasternak ground" . | COMPUTERS & STRUCTURES 316 (2025) . |
| APA | Dai, Zi-Hang , Du, Yan-Rui , Xu, Dan , Chen, Zhong-Yuan . Calculations of internal forces and rational reinforcement of raft foundation resting on Kerr-equivalent Pasternak ground . | COMPUTERS & STRUCTURES , 2025 , 316 . |
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The Vlasov foundation model and its variations belong to two-parameter elastic foundation beam models that can rationally reflect the displacement decrease law with increasing depth within the compressible elasticity layer. They are, however, only applicable for foundation beams resting on a single bearing stratum or horizontally layered soils. To meet the need to calculate slope anchor frames resting on nonsingle bearing strata or nonhorizontally layered soils that may often be encountered in practical engineering, a refined Vlasov model was presented in this paper. In this model, a general expression of the weighted thickness of the elasticity layer was established, and the corresponding expressions of the two parameters of soil resistance, as well as coefficient gamma, were deduced. Meanwhile, it was found that by dividing the relative stiffness of beam-soil into two variables expressed with a logarithm, the calibration factor chi P can be formulated by fitting its relationship with the two variables so that the problem of determining the thickness of the elasticity layer of the Vlasov model can be resolved. Based on the aforementioned, the finite-difference method was established considering the conditions of static equilibrium and compatible deformation of slope anchor frames. A corresponding computer program that can perform all operations was developed using Matlab (version 2019a). The three-dimensional finite-element method can truthfully simulate the slope anchor frame resting on nonsingle strata and obtain a high-precision numerical solution to this elastic mechanics problem. The example shows that the results by the finite-difference method based on the refined Vlasov model agreed well with those by the finite-element method, demonstrating the reliability of the finite-difference method. Furthermore, comparisons show that if a slope anchor frame resting on nonsingle bearing strata is simplified as a frame resting on a single bearing stratum like people used to do, it will lead to an overconservative or unsafe design result. The significance of this study lies in providing a valid and reliable approach for calculating the displacement and internal forces of slope anchor frames resting on nonsingle bearing strata.
Keyword ：
Bearing stratum Bearing stratum Finite-deference method Finite-deference method Foundation beam Foundation beam Refined Vlasov foundation model Refined Vlasov foundation model Slope anchor frame Slope anchor frame
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| GB/T 7714 | Yang, Jia-Hao , Dai, Zi-Hang , Tang, Xue-Feng . A Refined Vlasov Foundation Model and Finite-Difference Method for Computing Slope Anchor Frame Resting on Nonsingle Bearing Strata [J]. | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (10) . |
| MLA | Yang, Jia-Hao et al. "A Refined Vlasov Foundation Model and Finite-Difference Method for Computing Slope Anchor Frame Resting on Nonsingle Bearing Strata" . | INTERNATIONAL JOURNAL OF GEOMECHANICS 24 . 10 (2024) . |
| APA | Yang, Jia-Hao , Dai, Zi-Hang , Tang, Xue-Feng . A Refined Vlasov Foundation Model and Finite-Difference Method for Computing Slope Anchor Frame Resting on Nonsingle Bearing Strata . | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (10) . |
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To reveal the load-transfer mechanism of stiffened deep cement mixing (SDCM) piles, the three-dimensional numerical analysis of a pilot pile was first conducted using the finite element software Diana, which can simulate the Mohr-Coulomb friction interface. Comparisons show that the computed load-settlement curve and distribution law of the skin frictions agreed well with the measurements. Then, the numerical method was employed to model the group pile foundations with four SDCM piles. It shows that the bearing capacity increased with increasing pile spacing and core lengths. And most loading was shared by the stiffened cores. It indicates that negative skin frictions may arise at the bottom of a reinforced concrete pile cap or the end of a stiffened core. And there is a hysteresis effect for the peak frictions on the two interfaces to mobilize. Meanwhile, plastic shear zones in soil and DCM pile may sequentially arise with increasing load.
Keyword ：
load-transfer mechanism load-transfer mechanism negative skin friction negative skin friction Numerical analysis Numerical analysis plastic shear zone plastic shear zone stiffened deep cement mixing pile stiffened deep cement mixing pile
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| GB/T 7714 | Dai, Zi-Hang , Liu, Zhuo-Er , Zhang, Hao et al. Numerical analysis of load-transfer mechanism of stiffened deep cement mixing pile foundation [J]. | INTERNATIONAL JOURNAL OF GEOTECHNICAL ENGINEERING , 2023 , 17 (6) : 583-593 . |
| MLA | Dai, Zi-Hang et al. "Numerical analysis of load-transfer mechanism of stiffened deep cement mixing pile foundation" . | INTERNATIONAL JOURNAL OF GEOTECHNICAL ENGINEERING 17 . 6 (2023) : 583-593 . |
| APA | Dai, Zi-Hang , Liu, Zhuo-Er , Zhang, Hao , Qin, Zhi-Zhong . Numerical analysis of load-transfer mechanism of stiffened deep cement mixing pile foundation . | INTERNATIONAL JOURNAL OF GEOTECHNICAL ENGINEERING , 2023 , 17 (6) , 583-593 . |
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Abstract ：
在强降雨等因素影响下，新近失稳土质边坡易再次发生滑动，并对现场救援人员的安全构成威胁。如何对该类边坡的稳定性进行快速、准确地评价，亟须解决。由于古滑坡的滑动面处土体的抗剪强度随着时间的推移有所提高，故无法直接套用古滑坡复活的评价方法。常用的极限平衡条分法或有限元等数值分析法又需要事先进行现场勘察，耗时较长影响救援进度。因云模型评价方法对评价因子的精度要求较低，可弥补上述方法的不足之处。但目前对云模型评价因子权重的研究，仍存在一些不足之处，故提出采用反分析法来计算各评价因子的权重。选取坡高等9个易于获取且是决定边坡稳定性的主要因素为评价因子，参照《地质灾害调查技术要求》和前人的研究成果对各评价因子的稳定分级区间进行划分，利用MATLAB程序语言平台生成相应的综合云模型。根据滑坡前各评价因子的数值反分析其权重的云模型特征参数，建立可方便快捷地对新近失稳边坡进行稳定性评价的云模型，使用Python 语言和Qt Designer工具进行应用程序的开发。使用该应用程序对福建省永春县冷水村一新近失稳边坡2016年11月3—8日的稳定性进行评价，得到的结果与现场情况基本吻合，初步验证了该方法准确性。该程序的运行过程耗时较短，也验证了该方法的快速性。
Keyword ：
云模型 云模型 反分析法 反分析法 应用程序 应用程序 新近失稳边坡 新近失稳边坡 稳定性评价 稳定性评价
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| GB/T 7714 | 陈忠源 , 戴自航 , 简文彬 . 基于因子权重反分析的新近失稳土质边坡稳定性评价云模型 [J]. | 中国地质灾害与防治学报 , 2023 , 34 (4) : 125-133 . |
| MLA | 陈忠源 et al. "基于因子权重反分析的新近失稳土质边坡稳定性评价云模型" . | 中国地质灾害与防治学报 34 . 4 (2023) : 125-133 . |
| APA | 陈忠源 , 戴自航 , 简文彬 . 基于因子权重反分析的新近失稳土质边坡稳定性评价云模型 . | 中国地质灾害与防治学报 , 2023 , 34 (4) , 125-133 . |
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Fully buried portal frame-shaped piles have been widely used to control and stabilize largescale landslides or slopes. However, the working mechanism of portal frame piles, such as the soil-pile interaction and load transfer behavior, is still not fully understood, which has limited the development of effective pile designs and construction. In this study, a well-designed laboratory model test was conducted in a sandy soil slope with a man-made slip surface. Nine portal frame piles were installed, synthetically considering the pile spacing between the rear and front piles as well as the support condition of the pile ends. To make the test closer to reality, in addition to a small thrust due to the excavation of the slope, greater landslide thrusts were imposed on the rear side of the portal frame piles by gradually applying static loads on the top of the slope. It is found that in addition to a concentrated thrust transferred via the cap beam, a landslide thrust accounting for 30 to 60 % of the landslide thrust on the rear pile was transmitted to the front pile by the soil sandwiched between the rear and front piles, which should not be ignored in designs. Meanwhile, to evenly mobilize the bearing capacity of both the rear and front piles, the reasonable spacing between them should be 1.0 to 1.5 times the diameter of the pile. The study also shows that portal frame piles should be embedded in a stable soil layer rather than the bedrock if they can meet the requirements for bearing capacity.
Keyword ：
landslide thrust landslide thrust portal frame-shaped pile portal frame-shaped pile soil resistance soil resistance support condition of pile end support condition of pile end working mechanism working mechanism
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| GB/T 7714 | Dai, Zihang , Qiu, Zhihua , Li, Hengyang et al. Laboratory Model Test of Fully Buried Portal Frame-Shaped Slope-Stabilizing Piles [J]. | GEOTECHNICAL TESTING JOURNAL , 2022 , 45 (2) : 390-410 . |
| MLA | Dai, Zihang et al. "Laboratory Model Test of Fully Buried Portal Frame-Shaped Slope-Stabilizing Piles" . | GEOTECHNICAL TESTING JOURNAL 45 . 2 (2022) : 390-410 . |
| APA | Dai, Zihang , Qiu, Zhihua , Li, Hengyang , Lu, Caijin , Yang, Jianhui . Laboratory Model Test of Fully Buried Portal Frame-Shaped Slope-Stabilizing Piles . | GEOTECHNICAL TESTING JOURNAL , 2022 , 45 (2) , 390-410 . |
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Wind energy is one of the most sustainable and renewable resources for power generation. Offshore wind turbines (OWTs) derive significant wind energy compared to onshore installations. One of the greatest challenges encountered by installing the OWTs is the adequate design of their foundation in relatively soft and compressible marine soil. In most cases, the OWTs are supported by a single pile, termed as 'monopile foundation'. Apart from the usual loads from the superstructure, these piles are subjected to complex loading conditions under static and cyclic modes in the axial, lateral, and torsional directions due to the primary actions of the wave, wind, and current. To incorporate an appropriate design methodology, understanding the failure mechanisms of such piles is of the utmost necessity. This review paper aims to focus on the progressive development in the analysis of failure mechanisms and design practice relevant to the monopile foundations for OWTs by theoretical and experimental studies conducted globally. An extensive literature survey has been carried out to study the gradual progress on offshore pile-soil interaction, failure mechanisms, and design techniques of OWT supporting monopile foundations. Based on the studies, a brief overview of the various aspects of analysis and design has been carried out, and the relevant conclusions are drawn therefrom.
Keyword ：
failure mechanisms failure mechanisms offshore pile foundations offshore pile foundations offshore wind turbine offshore wind turbine wind energy wind energy
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| GB/T 7714 | Basack, Sudip , Goswami, Ghritartha , Dai, Zi-Hang et al. Failure-Mechanism and Design Techniques of Offshore Wind Turbine Pile Foundation: Review and Research Directions [J]. | SUSTAINABILITY , 2022 , 14 (19) . |
| MLA | Basack, Sudip et al. "Failure-Mechanism and Design Techniques of Offshore Wind Turbine Pile Foundation: Review and Research Directions" . | SUSTAINABILITY 14 . 19 (2022) . |
| APA | Basack, Sudip , Goswami, Ghritartha , Dai, Zi-Hang , Baruah, Parinita . Failure-Mechanism and Design Techniques of Offshore Wind Turbine Pile Foundation: Review and Research Directions . | SUSTAINABILITY , 2022 , 14 (19) . |
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To combine the advantages of the Mohr-Coulomb and the Duncan-Chang models, a new model called the nonlinear elastic-perfectly plastic model was established. In the numerical implementation of this model, a newly developed smoothing technique for yield and plastic potential surfaces was employed to accurately fit the side face of the hexagonal pyramid surface of the Mohr-Coulomb criterion. A user material subroutine was developed in Abaqus and was verified by modeling a conventional triaxial test of a soil specimen with the feature of a nonlinear elastic-perfectly plastic model. Finally, to further validate the applicability of this model and its subroutine, the 3D numerical simulation of a relatively complex deep excavation project was performed, and the results were compared with measured data, the results determined by the method recommended in the current code, and the results of the Mohr-Coulomb and Duncan-Chang models. The comparison demonstrates that the results of this new model were the closest to the measurements.
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| GB/T 7714 | Xu, X. , Dai, Z-H , Chen, L-J et al. Nonlinear Elastic-Perfectly Plastic Model of Soil and its Numerical Implementation and Application [J]. | SOIL MECHANICS AND FOUNDATION ENGINEERING , 2022 , 59 (3) : 215-223 . |
| MLA | Xu, X. et al. "Nonlinear Elastic-Perfectly Plastic Model of Soil and its Numerical Implementation and Application" . | SOIL MECHANICS AND FOUNDATION ENGINEERING 59 . 3 (2022) : 215-223 . |
| APA | Xu, X. , Dai, Z-H , Chen, L-J , Xu, X-T . Nonlinear Elastic-Perfectly Plastic Model of Soil and its Numerical Implementation and Application . | SOIL MECHANICS AND FOUNDATION ENGINEERING , 2022 , 59 (3) , 215-223 . |
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To enhance the accuracy and reliability of the design calculation for reinforced concrete slope-stabilizing pile, a three-dimensional and threefold nonlinear numerical modeling method was proposed. Namely, in the three-dimensional modeling the material nonlinearity is considered with soil modeled with a nonlinear elastic model, and reinforced concrete pile with an advanced damaged plasticity model for the first time in particular. The boundary nonlinearity is considered by using the Coulomb friction to model the interactions on both soil-pile and soil-rock interfaces. And the geometry nonlinearity is taken into account by adopting the large deformation algorithm. In addition, a post-processing approach for the sectional bending moment of pile body is presented when a reinforced concrete pile is modeled with solid elements, and steel bars with truss elements embedded in concrete. The proposed method was successfully applied to model a pilot pile. The same ultimate bearing capacity as the test was obtained. Comparisons also show that the computed displacements and maximum moments agreed well with the measurements regardless of whether the pile was working in the elastic or damaged plastic state, and even the advent of cracking was identical with the test. In addition, the fluctuation phenomenon of moment diagrams of the pile body in the damaged plastic state as well as the spatial distribution of soil resistance were revealed for the first time. The outcomes highlighted the accuracy, reliability and efficiency of the proposed method.
Keyword ：
Bending moment Bending moment Displacement Displacement Slope-stabilizing pile Slope-stabilizing pile Soil resistance Soil resistance Threefold nonlinear Threefold nonlinear
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| GB/T 7714 | Dai, Zihang , Yang, Jianhui , Dai, Rui et al. Three-Dimensional and Threefold Nonlinear Numerical Modeling for Slope-Stabilizing Pile [J]. | KSCE JOURNAL OF CIVIL ENGINEERING , 2022 , 26 (11) : 4390-4406 . |
| MLA | Dai, Zihang et al. "Three-Dimensional and Threefold Nonlinear Numerical Modeling for Slope-Stabilizing Pile" . | KSCE JOURNAL OF CIVIL ENGINEERING 26 . 11 (2022) : 4390-4406 . |
| APA | Dai, Zihang , Yang, Jianhui , Dai, Rui , Zhu, Qiaochuan . Three-Dimensional and Threefold Nonlinear Numerical Modeling for Slope-Stabilizing Pile . | KSCE JOURNAL OF CIVIL ENGINEERING , 2022 , 26 (11) , 4390-4406 . |
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理论和试验表明广义双剪应力准则比传统的Mohr-Coulomb准则能更准确地表述岩土材料的抗剪强度。然而,现有的大型有限元等数值软件中均没有基于该准则的本构模型。为对Mohr-Coulomb准则进行光滑化而提出的Gudehus-Argyris(G-A)函数,其实是广义双剪应力屈服函数的角隅函数。通过对该角隅函数的研究,构造G-A角隅模型,推导各流动矢量计算表达式;在ABAQUS平台上,采用Fortran语言编制相应的基于完全隐式向后欧拉积分算法的UMAT子程序;将该子程序应用于模拟常规三轴压缩、单轴拉伸和真三轴试验以及一均质路堤稳定性分析中,并与ABAQUS内嵌Mohr-Coulomb模型的结...
Keyword ：
Gudehus-Argyris函数 Gudehus-Argyris函数 Mohr-Coulomb准则 Mohr-Coulomb准则 UMAT UMAT 土力学 土力学 完全隐式向后欧拉算法 完全隐式向后欧拉算法 广义双剪应力准则 广义双剪应力准则
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| GB/T 7714 | 戴自航 , 何振 . 广义双剪应力准则的一种角隅模型的数值实现及应用 [J]. | 岩石力学与工程学报 , 2021 , 40 (11) : 2320-2329 . |
| MLA | 戴自航 et al. "广义双剪应力准则的一种角隅模型的数值实现及应用" . | 岩石力学与工程学报 40 . 11 (2021) : 2320-2329 . |
| APA | 戴自航 , 何振 . 广义双剪应力准则的一种角隅模型的数值实现及应用 . | 岩石力学与工程学报 , 2021 , 40 (11) , 2320-2329 . |
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