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学者姓名：马宏岩
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在南方潮湿多雨地区,红黏土路基易出现沉降过大、不均匀沉降等病害,为研究在干湿循环作用下纤维红黏土的抗剪强度特性,将聚丙烯纤维掺入红黏土中,形成纤维红黏土.通过直接剪切试验,研究了不同纤维掺量(0‰、2‰、6‰、10‰)、纤维长度(0、3、6、9 mm)和干湿循环次数(0、2、4、6 次)对红黏土抗剪强度特性的影响.结果表明:掺入纤维可显著提升红黏土的抗剪强度,在研究的掺量与长度范围内,抗剪强度随纤维掺量和长度的增加而增大;纤维在提高红黏土的黏聚力效果显著,而对于内摩擦角的提升有限;纤维长度为 6mm时,红黏土抗剪强度最大;干湿循环会显著降低红黏土强度,且对黏聚力劣化作用超过了内摩擦角,在干湿循环作用下,纤维和法向压力可降低干湿循环对红黏土的劣化作用.笔者基于试验结果,利用反向传播(BP)神经网络技术,建立了红黏土在干湿循环作用下的强度预测模型,其预测相对误差值在 10%以下.
Keyword ：
干湿循环试验 干湿循环试验 抗剪强度 抗剪强度 神经网络模型 神经网络模型 红黏土 红黏土 道路工程 道路工程
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| GB/T 7714 | 马宏岩 , 翁明胜 , 黄仁杰 et al. 干湿循环下聚丙烯纤维改良红黏土抗剪强度特性及预测模型 [J]. | 重庆交通大学学报（自然科学版） , 2025 , 44 (3) : 33-39 . |
| MLA | 马宏岩 et al. "干湿循环下聚丙烯纤维改良红黏土抗剪强度特性及预测模型" . | 重庆交通大学学报（自然科学版） 44 . 3 (2025) : 33-39 . |
| APA | 马宏岩 , 翁明胜 , 黄仁杰 , 徐松 , 郑丽堂 . 干湿循环下聚丙烯纤维改良红黏土抗剪强度特性及预测模型 . | 重庆交通大学学报（自然科学版） , 2025 , 44 (3) , 33-39 . |
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SBS modified bitumen (SMB) is widely used for its excellent physical and rheological properties, but it is susceptible to aging due to exposure to environmental factors such as heat, light, and oxygen. This aging process involves bitumen aging and SBS degradation, which complicates the rejuvenation of SMB. In order to explore the rejuvenation mechanism of aged SMB, particularly emphasizing the rejuvenation effects of epoxy compounds (BUDGE, TMPGE, and RDGE), a combination of molecular dynamics simulation and experiments was employed. The thermodynamic, chemical, and physical properties of rejuvenated SMB were analyzed. Results show that BUDGE and its repaired SBS exhibit excellent flexibility compared to TMPGE, improving cohesive energy density and free volume of aged bitumen, which facilitates recovery of ductility in aged SMB. Conversely, SBS repaired with RDGE increases cohesive energy density of aged SMB while reducing free volume, which enhances stiffness of bitumen. Additionally, rigid groups in RDGE inhibit mobility of both itself and the repaired SBS, leading to a reduction in the ductility of aged SMB to 10.1 cm. Besides, SBS repaired with RDGE shows strongest binding with resins and aromatics, which diminishes lubricating effect of these components on asphaltenes. This reduction in lubrication enhances aggregation of asphaltenes, ultimately raising flow resistance.
Keyword ：
Epoxy compounds Epoxy compounds Molecular dynamics simulation Molecular dynamics simulation Rejuvenated SBS modified bitumen Rejuvenated SBS modified bitumen Rejuvenation mechanism analysis Rejuvenation mechanism analysis
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| GB/T 7714 | Xu, Song , Niu, Xiangjie , Cai, Shaoxu et al. Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics [J]. | POLYMER DEGRADATION AND STABILITY , 2025 , 238 . |
| MLA | Xu, Song et al. "Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics" . | POLYMER DEGRADATION AND STABILITY 238 (2025) . |
| APA | Xu, Song , Niu, Xiangjie , Cai, Shaoxu , Xu, Bingtao , Fang, Lei , Cao, Zhilong et al. Investigation on active rejuvenation mechanism of aged SBS modified bitumen: Insights from experiments and molecular dynamics . | POLYMER DEGRADATION AND STABILITY , 2025 , 238 . |
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The diglycidyl ether (HDDGE) and dicyclohexylmethane diisocyanate (HMDI) are widely adopted as active rejuvenators in the field of regenerated SBS modified bitumen (RSMB), which can react with the oxygen-containing functional group on the aged SBS, thereby rebuilding the crosslinking net of the SBS. Numerous measurements indicate that HDDGE negatively affects the high-temperature performance of RSMB, while HMDI impairs its low-temperature performance. This unexplained phenomenon continues to impede the effective regeneration of bitumen. To reveal the underlying mechanism of this phenomenon, this study investigates the SBS-bitumen interface inside the RSMB thought the molecular dynamics simulation, and conducts the experiments in the lab to prove the inference. Results indicated that the type and dosage of rejuvenators will affect the H-bonds inside regenerated SBS, which will change the configuration of SBS molecules. Subsequently, the regenerated SBS molecules will redetermine the fractions located at the SBS-bitumen interface thought the space steric hindrance effect and interaction between SBS and bitumen, which will alter the colloid structure of RSMB. This will significantly change the free volume of the RSMB, and will finally affect the macro-properties of RSMB. © 2025 Elsevier B.V.
Keyword ：
1 1 6-Hexanediol diglycidyl ether 6-Hexanediol diglycidyl ether Crosslinking kinetics Crosslinking kinetics Dicyclohexylmethane diisocyanate Dicyclohexylmethane diisocyanate Regenerated SBS modified bitumen Regenerated SBS modified bitumen Sustainable development Sustainable development
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| GB/T 7714 | Xu, S. , Cai, S. , Nui, X. et al. Action mechanism of different active rejuvenators on the colloid structure of regenerated Styrene-butadiene-Styrene block copolymer modified bitumen: A perspective from Styrene-butadiene-Styrene block copolymer-bitumen interface [J]. | Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2025 , 718 . |
| MLA | Xu, S. et al. "Action mechanism of different active rejuvenators on the colloid structure of regenerated Styrene-butadiene-Styrene block copolymer modified bitumen: A perspective from Styrene-butadiene-Styrene block copolymer-bitumen interface" . | Colloids and Surfaces A: Physicochemical and Engineering Aspects 718 (2025) . |
| APA | Xu, S. , Cai, S. , Nui, X. , Cao, Z. , Fang, L. , Zhang, D. et al. Action mechanism of different active rejuvenators on the colloid structure of regenerated Styrene-butadiene-Styrene block copolymer modified bitumen: A perspective from Styrene-butadiene-Styrene block copolymer-bitumen interface . | Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2025 , 718 . |
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Red clay was a special roadbed filling soil that was easy to expand and shrink because of the characteristics of high liquid limit and high porosity, leading to the appearance of a large number of cracks. In order to understand the cracking mechanism and nonlinear fracture failure process of red clay, the fracture toughness and crack sensitivity of red clay with different saturation, compaction and gravel content were analyzed by three-point bending cracking experiment and Image processing technology, and then the cohesive crack model was established to describe the fracture toughness. The results showed that the cracking process of red clay could be divided into three stages: crack incubation period, crack initiation and propagation period and visible cracks appearance stage. There was a conic function relationship between fracture toughness and saturation and a positive correlation between fracture toughness and compactness. The influence of gravel content on the final fracture path of red clay was the most significant, while the effects of saturation and compaction could be ignored. In addition, the fracture toughness converted from the cohesive crack model was basically as the same as the measured. This work provided a basis for theoretical analysis and numerical calculation for the fracture toughness of red clay under three-point bending. © 2024 Elsevier Ltd
Keyword ：
Compaction Compaction Cracks Cracks Ductile fracture Ductile fracture Fracture toughness Fracture toughness Gravel Gravel Image processing Image processing
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| GB/T 7714 | Ma, Hongyan , Su, Wentao , Cheng, Peiyuan et al. Fracture propagation characteristics of pre-cracked red clay in roadbed filling under three-point bending [J]. | Theoretical and Applied Fracture Mechanics , 2024 , 133 . |
| MLA | Ma, Hongyan et al. "Fracture propagation characteristics of pre-cracked red clay in roadbed filling under three-point bending" . | Theoretical and Applied Fracture Mechanics 133 (2024) . |
| APA | Ma, Hongyan , Su, Wentao , Cheng, Peiyuan , Xu, Song , Lv, Mengxi . Fracture propagation characteristics of pre-cracked red clay in roadbed filling under three-point bending . | Theoretical and Applied Fracture Mechanics , 2024 , 133 . |
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Abstract ：
Red clay was a special roadbed filling soil that was easy to expand and shrink because of the characteristics of high liquid limit and high porosity, leading to the appearance of a large number of cracks. In order to understand the cracking mechanism and nonlinear fracture failure process of red clay, the fracture toughness and crack sensitivity of red clay with different saturation, compaction and gravel content were analyzed by three-point bending cracking experiment and Image processing technology, and then the cohesive crack model was established to describe the fracture toughness. The results showed that the cracking process of red clay could be divided into three stages: crack incubation period, crack initiation and propagation period and visible cracks appearance stage. There was a conic function relationship between fracture toughness and saturation and a positive correlation between fracture toughness and compactness. The influence of gravel content on the final fracture path of red clay was the most significant, while the effects of saturation and compaction could be ignored. In addition, the fracture toughness converted from the cohesive crack model was basically as the same as the measured. This work provided a basis for theoretical analysis and numerical calculation for the fracture toughness of red clay under three-point bending.
Keyword ：
Fracture toughness Fracture toughness Image processing technology Image processing technology Nonlinear fracture failure Nonlinear fracture failure Red clay Red clay Three-point bending Three-point bending
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| GB/T 7714 | Ma, Hongyan , Su, Wentao , Cheng, Peiyuan et al. Fracture propagation characteristics of pre-cracked red clay in roadbed filling under three-point bending [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 133 . |
| MLA | Ma, Hongyan et al. "Fracture propagation characteristics of pre-cracked red clay in roadbed filling under three-point bending" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 133 (2024) . |
| APA | Ma, Hongyan , Su, Wentao , Cheng, Peiyuan , Xu, Song , Lv, Mengxi . Fracture propagation characteristics of pre-cracked red clay in roadbed filling under three-point bending . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 133 . |
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Red clay exhibits characteristics such as softening owing to water absorption and cracking because of water loss, which can lead to slope instability, road cracking, and compromised structural integrity when used directly in roadbed filling. Although the addition of industrial materials such as cement is a common engineering treatment, it severely impairs soil renewability. Lignosulfonate (LS) extracted from paper plant waste fluids is a natural bio-based polymer with promising applications as a soil improver. In this study, the boundary moisture content and mechanical properties of LS-treated red clay were investigated using Atterberg, unconfined compressive strength, and direct shear strength tests. Additionally, the LS-treated red clay modification mechanism was explored at multiple scales using zeta potential analysis, X-ray diffraction, scanning electron microscopy coupled with energy dispersive spectroscopy, and Fourier transform infrared spectroscopy. The results indicated that the LS dosage significantly affected both the water content and mechanical strength of the red clay boundaries. The optimal dosage of LS for red clay was 3 wt. %, at which the liquid limit was reduced by 32.97%, the plastic limit by 19.33%, and the plasticity index by 48.37%. The 28-day compressive strength of LS-treated red clay was increased by 378.4%, and the direct shear strength was increased by 136%. Analysis of the microstructure and mineral composition revealed that the LS-treated red clay did not form new minerals, but primarily filled pores and connected soil particles. Through the combined effects of hydrogen bonds, electrostatic interactions, and cation exchange, the LS-treated red clay reduced the size of the mineral particles and the thickness of the mineral double electric layer, resulting in increased structural densification. These results are of great scientific significance for the ecological modification of soils.
Keyword ：
Boundary moisture content Boundary moisture content Lignosulfonate Lignosulfonate Mechanical property Mechanical property Microstructure Microstructure Modification mechanism Modification mechanism Red clay Red clay
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| GB/T 7714 | Ma, Hongyan , Pei, Chenglin , Li, Sihan et al. Performance Evaluation and Modification Mechanism of Red Clay Treated with Lignosulfonate [J]. | INTERNATIONAL JOURNAL OF CIVIL ENGINEERING , 2024 , 22 (11) : 1961-1976 . |
| MLA | Ma, Hongyan et al. "Performance Evaluation and Modification Mechanism of Red Clay Treated with Lignosulfonate" . | INTERNATIONAL JOURNAL OF CIVIL ENGINEERING 22 . 11 (2024) : 1961-1976 . |
| APA | Ma, Hongyan , Pei, Chenglin , Li, Sihan , Xu, Song . Performance Evaluation and Modification Mechanism of Red Clay Treated with Lignosulfonate . | INTERNATIONAL JOURNAL OF CIVIL ENGINEERING , 2024 , 22 (11) , 1961-1976 . |
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Red clay is a special soil that loses water and shrinks easily, which causes expansion and contraction and leads to the generation and development of cracks, weakening the strength and engineering properties of the soil. This investigation analyzed the mechanism of crack evolution and patterns of strength decay in red clay under dry-wet cycles and established a relationship between strength and crack ratio by employing image processing techniques and conducting direct shear tests on red clay with various initial moisture contents and humidification times. The results show that the crack ratio increases with the number of dry-wet cycles and eventually tends to be stable after the fourth dry-wet cycle, and the stress-displacement curve of red clay changes from weak hardening to hardening. With the progress of the dry and wet cycles, the shear strength indexes of red clay decrease extensively, displaying a negative association with the sample's initial moisture content and the duration of humidification. Based on the experimental result, a quadratic function was established to model the relationship between soil cracking ratio and shear strength, which can predict the shear strength of red clay from the cracking ratio.
Keyword ：
Crack Crack Dry-wet cycle Dry-wet cycle Image processing technology Image processing technology Red clay Red clay Shear strength Shear strength
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| GB/T 7714 | Ma, Hongyan , Pei, Chenglin , Huang, Renjie et al. Crack Evolution and Strength Attenuation of Red Clay under Dry-Wet Cycles [J]. | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (4) . |
| MLA | Ma, Hongyan et al. "Crack Evolution and Strength Attenuation of Red Clay under Dry-Wet Cycles" . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING 36 . 4 (2024) . |
| APA | Ma, Hongyan , Pei, Chenglin , Huang, Renjie , Xu, Song . Crack Evolution and Strength Attenuation of Red Clay under Dry-Wet Cycles . | JOURNAL OF MATERIALS IN CIVIL ENGINEERING , 2024 , 36 (4) . |
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Red clay is highly susceptible to cracking due to its nature, and the reduction in strength caused by cracking can lead to engineering disasters. To investigate the cracking sensitivity of red clay, a homogeneous fracture model of red clay based on the cohesive zone model was established using ABAQUS in this work, the reliability of the model was verified through a three-point bending test, and then the crack propagation process and sensitivity to test factors of red clay were further analyzed. The results show that the fracture simulation of the cohesive zone model is in good agreement with the test results, confirming by the high reliability. The depth of prefabricated cracks and fulcrum spacing had the significant effects on the crack path, and the decrease of prefabricated crack depth and fulcrum spacing led to the increase of critical load. Meanwhile, the loading rate had little effect on the load-displacement curves.
Keyword ：
cohesion model cohesion model red clay red clay structural damage structural damage three-point bending test three-point bending test
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| GB/T 7714 | Ma, Hongyan , Yan, Xiaobin , Cheng, Peiyuan et al. Cracking Sensitivity Analysis of Red Clay With Pre-Crack Under Three-Point Bending [J]. | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2024 , 48 (2) : 885-899 . |
| MLA | Ma, Hongyan et al. "Cracking Sensitivity Analysis of Red Clay With Pre-Crack Under Three-Point Bending" . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES 48 . 2 (2024) : 885-899 . |
| APA | Ma, Hongyan , Yan, Xiaobin , Cheng, Peiyuan , Xu, Song , Zhang, Yanping , Li, Sihan . Cracking Sensitivity Analysis of Red Clay With Pre-Crack Under Three-Point Bending . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2024 , 48 (2) , 885-899 . |
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Due to the long-term effect of cyclic traffic loads, the accumulated deformation of red clay subgrades is increasing, strength is decreasing, and problems such as uneven settlement are occurring. In order to improve the stability and durability of red clay subgrade, this paper analyzes the effects of cyclic stress ratios and compactness on the development of the dynamic elastic modulus of saturated red clay. This is achieved through dynamic triaxial tests on red clay in the Qingyuan County, Zhejiang Province, China. The results show that the saturated red clay has an attenuation threshold cyclic stress ratio under cyclic loading. The attenuation threshold cyclic stress ratio prediction models were constructed based on the confining pressure and compactness, respectively. By introducing the concept of a relative cyclic stress ratio, the prediction model of the dynamic elastic modulus of saturated red clay (as based on cyclic vibration times and close cyclic stress ratio) is constructed. The model realizes the prediction of the dynamic elastic modulus of red clay under arbitrary cyclic vibration times via the initial cyclic stress ratio, compactness, and other parameters. It provides a theoretical basis for rationally evaluating the dynamic stability of red clay subgrade under cyclic loading.
Keyword ：
dynamic elastic modulus dynamic elastic modulus dynamic triaxial test dynamic triaxial test prediction model prediction model red clay red clay subgrade engineering subgrade engineering
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| GB/T 7714 | Ma, Hongyan , Zhuang, Yuanlong , Chen, Liangliang et al. Experiments and Modeling of the Attenuation of the Dynamic Elastic Modulus of Saturated Red Clay under Cyclic Loading [J]. | SUSTAINABILITY , 2023 , 15 (1) . |
| MLA | Ma, Hongyan et al. "Experiments and Modeling of the Attenuation of the Dynamic Elastic Modulus of Saturated Red Clay under Cyclic Loading" . | SUSTAINABILITY 15 . 1 (2023) . |
| APA | Ma, Hongyan , Zhuang, Yuanlong , Chen, Liangliang , Lv, Mengxi , Xu, Song . Experiments and Modeling of the Attenuation of the Dynamic Elastic Modulus of Saturated Red Clay under Cyclic Loading . | SUSTAINABILITY , 2023 , 15 (1) . |
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Frost heave in seasonally frozen regions is a one-dimensional process that could severely damage infrastructure subgrades.Stress state,temperature and water migration are important factors for frost heave.This work investigated the effects of soil temperature and volumetric water content on the transient frost heave ratio during the freezing of saturated silty clay in an open system and analyzed the relationships between the transient frost heave ratio and freezing rate and between temperature gradient and frost heave rate.The results show that the frost heave ratio,frost heave rate,and freezing rate are positively correlated with the temperature gradient since the temperature gradient drives the water migration during freezing,indicating the transient temperature gradient could be used to evaluate the frost heave of saturated silty clay.The transient freezing rate and transient frost heave ratio are logarithmically related to the transient frost heave ratio and transient temperature gradient,respectively.The effects of transient temperature gradient on frost heave are the principal mechanism responsible for different frost heave characteristics and uneven frost heave along a subgrade of the same soil type.
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| GB/T 7714 | HongYan Ma , YuanFang Cui , JianQiao Zhang et al. Effects of transient temperature gradient on frost heave of saturated silty clay in an open system [J]. | 寒旱区科学（英文版） , 2023 , 15 (6) : 268-277 . |
| MLA | HongYan Ma et al. "Effects of transient temperature gradient on frost heave of saturated silty clay in an open system" . | 寒旱区科学（英文版） 15 . 6 (2023) : 268-277 . |
| APA | HongYan Ma , YuanFang Cui , JianQiao Zhang , Song Li , Song Xu . Effects of transient temperature gradient on frost heave of saturated silty clay in an open system . | 寒旱区科学（英文版） , 2023 , 15 (6) , 268-277 . |
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