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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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为克服现有Winkler地基上边坡锚固框架设计计算的有限差分法需假设框架在锚杆处截断的问题,通过建立受集中荷载作用的Winkler地基梁的挠曲微分方程,提出无需做截断处理的简明有限差分法.基于提出的差分方法,改进锚杆拉力在框架纵横梁上的分配与调整方法,并采用Matlab开发功能完善的程序.结果表明:有限差分数值解具有较高的计算精度,框架外伸段直接计算结果会出现负的土抗力,致使计算结果偏于不安全,可通过调整该段边界条件的方法予以消除,使最终计算结果更加可靠.本研究开发的差分程序对锚固框架整体设计提供了一种高效的计算方法.
Keyword ：
Winkler地基 Winkler地基 有限差分法 有限差分法 荷载分配与调整 荷载分配与调整 边坡锚固框架 边坡锚固框架
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| GB/T 7714 | 杨家豪 , 戴自航 , 唐雪峰 . Winkler地基上边坡锚固框架设计计算的简明有限差分法 [J]. | 水利与建筑工程学报 , 2024 , 22 (1) : 140-147,169 . |
| MLA | 杨家豪 et al. "Winkler地基上边坡锚固框架设计计算的简明有限差分法" . | 水利与建筑工程学报 22 . 1 (2024) : 140-147,169 . |
| APA | 杨家豪 , 戴自航 , 唐雪峰 . Winkler地基上边坡锚固框架设计计算的简明有限差分法 . | 水利与建筑工程学报 , 2024 , 22 (1) , 140-147,169 . |
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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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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 ：
环境温度变化导致基坑支护结构内支撑轴力和变形过大的问题不容忽视.本文以福州地铁6号线潘墩站坑中坑工程为例,选取该基坑代表性区段采用ABAQUS程序及邓肯-张模型对其开挖和支护全过程进行三维有限元模拟,并将分析结果与现场部分监测数据进行对比,验证了所建模型及其材料参数取值的可靠性.同时,利用所建模型着重分析当地可能的季节或昼夜温差变化幅度内支撑轴力及围护墙水平位移的变化规律.结果表明:基坑开挖完成后,温度变化时支撑轴力与温度呈线性相关关系,轴力变化主要体现在内外坑的首道支撑上,此时围护结构整体向坑内或坑外运动,且地连墙侧移受温度影响范围主要集中在基坑开挖深度以上.不同开挖阶段的温度变化引起的温度效应相差较大,潘墩站最不利工况发生在最后一道支撑架设完毕后,此时地连墙水平位移增量及轴力变化幅度最大,温度效应最明显.该研究成果对类似软土基坑工程具有重要的理论和实践意义.
Keyword ：
地铁6号线 地铁6号线 坑中坑 坑中坑 数值分析 数值分析 温度效应 温度效应 潘墩站 潘墩站 现场监测 现场监测 福州 福州
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| GB/T 7714 | 陈林靖 , 罗一鸣 , 戴自航 . 软土地基坑中坑支护体系温度效应的数值分析 [J]. | 地质与勘探 , 2023 , 59 (3) : 637-646 . |
| MLA | 陈林靖 et al. "软土地基坑中坑支护体系温度效应的数值分析" . | 地质与勘探 59 . 3 (2023) : 637-646 . |
| APA | 陈林靖 , 罗一鸣 , 戴自航 . 软土地基坑中坑支护体系温度效应的数值分析 . | 地质与勘探 , 2023 , 59 (3) , 637-646 . |
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选用合适的土的本构模型是确保岩土工程问题数值模拟定量计算精度的关键.近些年来,两种土的高等本构模型,即硬化土模型(HS模型)和考虑小应变刚度的硬化土模型(HSS模型)在已有的研究中表现出良好的有效性和先进性,但目前鲜有将其应用于黄土工程问题的研究.为此,针对笔者开展的室内黄土三轴压缩试验和现场黄土地基平板载荷试验,采用Diana有限元软件中的HS和HSS模型及常用莫尔-库伦模型(M-C模型)和邓肯-张模型(D-C模型)开展了数值模拟对比研究.结果表明:HS和HSS模型比常用的M-C和D-C模型更好地拟合了这两种试验结果,且HSS模型比HS模型总体拟合结果更好.因此,HS和HSS模型在模拟黄土变形及其失稳破坏机理方面比后两者更可靠,具有推广使用价值.
Keyword ：
硬化土模型 硬化土模型 考虑小应变刚度的硬化土模型模型 考虑小应变刚度的硬化土模型模型 莫尔-库伦模型 莫尔-库伦模型 邓肯-张模型 邓肯-张模型 黄土 黄土
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| GB/T 7714 | 廖军 , 朱桥川 , 王治军 et al. 高等与常用本构模型对黄土变形影响的模拟对比 [J]. | 地下空间与工程学报 , 2023 , 19 (3) : 784-792 . |
| MLA | 廖军 et al. "高等与常用本构模型对黄土变形影响的模拟对比" . | 地下空间与工程学报 19 . 3 (2023) : 784-792 . |
| APA | 廖军 , 朱桥川 , 王治军 , 戴自航 . 高等与常用本构模型对黄土变形影响的模拟对比 . | 地下空间与工程学报 , 2023 , 19 (3) , 784-792 . |
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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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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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