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学者姓名：马宏岩
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Abstract ：
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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This study investigates the factors affecting crack development in red clay roadbeds and slopes through a combined computational and experimental approach. A finite-element model of a prefabricated cracked red clay fracture was established using a cohesive zone model, integrating fracture mechanics theory with numerical analysis. The model was based on an improved three-point bending test system to obtain raw data. The effects of prefabricated crack depth, width, shape, and support span on crack propagation in red clay were systematically investigated. The results indicate that the reliability of the model is confirmed by the three-point bending test. The degree of curvature of the crack depth on the Mode I fracture extension was more significant compared with Mixed mode I-II fractures. Variations in prefabricated cracks fracture had minimal impact on peak load and the degree of curvature of the crack extension in Mode I. The maximum crack width and length occurred at a prefabricated crack width of 2 mm, with the lowest curvature observed. Conversely, a crack width of 6.5 mm led to the highest curvature in Mixed mode I-II fractures. The alteration of the prefabricated crack shapes revealed that, for Mode I fracture, triangular prefabricated cracks resulted in the maximum crack width and length, and the lowest degree of crack curvature. The shape of the prefabricated crack had a minor effect on peak load, with triangular tips yielding the longest crack extension length and highest degree of curvature in Mixed mode I-II fractures. Support span had a limited effect on the crack extension path of Mode I fracture; increasing the span led to a 60.4% reduction in maximum crack width and a 28.9% reduction in maximum crack length. In Mixed mode I-II fractures, the support span inversely correlated with maximum crack width and length.
Keyword ：
Cohesive zone model Cohesive zone model Crack development Crack development FEM FEM Fracture mechanics Fracture mechanics Red clay Red clay
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| GB/T 7714 | Ma, Hongyan , Cui, Yuanfang , Zhang, Yanping et al. Combined Computational and Experimental Studies on the Bending Cracking Behavior of Red Clay [J]. | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2025 , 25 (6) . |
| MLA | Ma, Hongyan et al. "Combined Computational and Experimental Studies on the Bending Cracking Behavior of Red Clay" . | INTERNATIONAL JOURNAL OF GEOMECHANICS 25 . 6 (2025) . |
| APA | Ma, Hongyan , Cui, Yuanfang , Zhang, Yanping , Xu, Song . Combined Computational and Experimental Studies on the Bending Cracking Behavior of Red Clay . | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2025 , 25 (6) . |
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The aging of SBS modified bitumen (SMB) involves bitumen aging and SBS degradation. Traditional rejuvenators restore bitumen properties by rebalancing its chemical composition but fail to repair damaged SBS. Some reactive rejuvenators can repair damaged SBS, improving low temperature performance of rejuvenated SMB but compromising high temperature stability. In order to achieve rejuvenated SMB with excellent high and low temperature performance, an aliphatic epoxy compound (1,6-hexanediol diglycidyl ether, HDE), aromatic epoxy compounds (resorcinol diglycidyl ether, RDGE; 2,2-bis (4-glycidyloxyphenyl) propane, DGEBA; N, N, N', N'tetraglycidyl-4,4 '-diaminodiphenylmethane, MBDA), a catalyst (Pentaethylenehexamine, PEHA) as well as biooil were utilized to develop a novel composite reactive rejuvenation system. The optimal composition of rejuvenation system was determined through physical properties test, followed by rheological test to evaluate rheological properties of rejuvenated SMB. The rejuvenation effect of the composite system was demonstrated using FTIR and FM tests, and the molecular dynamics simulation was conducted to explore the composite reaction rejuvenation mechanism of aged SMB. Results show that the combination of HDE and DGEBA presents superior effectiveness compared to others. SBS repaired with HDE exhibits enhanced flexibility, allowing for greater molecular chain rearrangement, which leads to a looser molecular structure and increased free volume fraction, enabling rejuvenated SMB to maintain better deformability at low temperatures. The incorporation of DGEBA introduces rigid groups that constrain molecular chain conformation and slippage, rotation, or stretching between chain segments, which reduces the free volume fraction and improves deformation resistance. Besides, SBS repaired with DGEBA shows stronger interactions with asphaltenes, better restricting their mobility and enhancing the rigidity of bitumen. At an HDE:DGEBA ratio of 1:1, with a total dosage of 5 wt % by weight of bitumen, the composite reactive rejuvenation system restores crosslinking network of SBS in bitumen and achieves rejuvenated SMB with excellent high and low temperature performance.
Keyword ：
All-component rejuvenation All-component rejuvenation Molecular dynamics simulation Molecular dynamics simulation Performance evaluation Performance evaluation Rejuvenation mechanism analysis Rejuvenation mechanism analysis SBS modified bitumen SBS modified bitumen
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| GB/T 7714 | Xu, Song , Niu, Xiangjie , Pan, Shilong et al. Novel reactive rejuvenation strategy for aged SBS modified bitumen based on molecular structure modulation [J]. | POLYMER DEGRADATION AND STABILITY , 2025 , 239 . |
| MLA | Xu, Song et al. "Novel reactive rejuvenation strategy for aged SBS modified bitumen based on molecular structure modulation" . | POLYMER DEGRADATION AND STABILITY 239 (2025) . |
| APA | Xu, Song , Niu, Xiangjie , Pan, Shilong , Xu, Bingtao , Cai, Shaoxu , Fang, Lei et al. Novel reactive rejuvenation strategy for aged SBS modified bitumen based on molecular structure modulation . | POLYMER DEGRADATION AND STABILITY , 2025 , 239 . |
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In order to investigate the effects of reactive rejuvenation strategies on volatile organic compounds (VOCs) emissions and the performance of aged SBS modified bitumen (SMB), gas chromatography-mass spectrometry test, physical property tests, and rheological property tests were utilized to evaluate the effectiveness of bio-oil, the epoxy-based rejuvenator, the isocyanate-based rejuvenator and the composite reactive rejuvenator. A multicriteria evaluation model integrating rejuvenation effectiveness, environmental impact, and health risk was then applied to identify the optimal reactive rejuvenator. Results show that all rejuvenators increase the VOCs emission concentration and the proportion of oxygenated volatile organic compounds (OVOCs), along with varying degrees of elevation in ozone formation potential, secondary organic aerosol formation potential, carcinogenic risk, and hazard index. Bio-oil has limited rejuvenation effectiveness and holds the lowest overall ranking. The epoxy-based rejuvenator provides rejuvenated SMB with numerous flexible chain segments that exhibit considerable rotational freedom, which contributes to improved low temperature cracking resistance. However, it poses the highest environmental and health risks. The isocyanate-based rejuvenator imparts rigid molecular structures that enhance the deformation resistance of rejuvenated SMB, albeit at the expense of reduced flexibility. The composite reactive rejuvenator exhibits superior rejuvenation effectiveness with the lowest environmental and health impacts.
Keyword ：
Comprehensive evaluation Comprehensive evaluation Performance analysis Performance analysis Reactive rejuvenation Reactive rejuvenation SBS modified bitumen SBS modified bitumen Volatile organic compounds emission Volatile organic compounds emission
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| GB/T 7714 | Xu, Song , Niu, Xiangjie , Luo, Yuyang et al. Comparative analysis of reactive rejuvenation strategies for aged SBS modified bitumen: insights from volatile organic compounds emission characteristics and performance evaluation [J]. | JOURNAL OF HAZARDOUS MATERIALS , 2025 , 498 . |
| MLA | Xu, Song et al. "Comparative analysis of reactive rejuvenation strategies for aged SBS modified bitumen: insights from volatile organic compounds emission characteristics and performance evaluation" . | JOURNAL OF HAZARDOUS MATERIALS 498 (2025) . |
| APA | Xu, Song , Niu, Xiangjie , Luo, Yuyang , Cai, Shaoxu , Yang, Shuai , Fang, Lei et al. Comparative analysis of reactive rejuvenation strategies for aged SBS modified bitumen: insights from volatile organic compounds emission characteristics and performance evaluation . | JOURNAL OF HAZARDOUS MATERIALS , 2025 , 498 . |
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Asphalt undergoes thermal-oxidative and ultraviolet (UV) aging in its lifespan, yet current research tends to emphasize the enhancement of asphalt's resistance to only one type of aging, which hinders the improvement of its overall durability. In order to improve the resistance of asphalt to thermal-oxidative and ultraviolet aging, LDHs and antioxidants were utilized to modify asphalt based on the concept of physical shielding and chemical blocking. Moreover, to boost the compatibility between LDHs and asphalt, LDHs were organically modified using salicylic acid (SA) and sodium sodium dodecyl benzene sulfonate (SDBS). The composite effect of organic LDHs and antioxidants (Irganox 1076 and Irganox 1010) was investigated through physical and rheological tests. Also, thermal-oxidative and UV aging tests were utilized to evaluate the effectiveness of organic LDHs and antioxidants. Results show that SDBS and SA can be effectively intercalated into the LDHs, which improves the compatibility between LDHs and asphalt. LDHs, as a rigid component, increases the shear resistance of asphalt, which contributes to improved high-temperature performance but diminishes its flexibility. Organic modification can mitigate this drawback. In contrast, antioxidants exhibit a softening effect on asphalt. Organic LDHs and antioxidants can simultaneously boost the resistance of asphalt to UV and thermal-oxidative aging, with no interference observed between the two. Besides, the composite effect between SDBS-LDHs and Irganox 1076 is limited, whereas the composite effect of SA-LDHs and Irganox 1010 shows the most notable improvement. This can be attributed to the composite mechanism in which SA-LDHs provides physical shielding and Irganox 1010 chemically blocks the chain aging process of asphalt. These findings provide novel insights into the improvement of asphalt and asphalt pavement durability through a combined physical and chemical strategy.
Keyword ：
Antioxidants Antioxidants Asphalt Asphalt Organic layered double hydroxides Organic layered double hydroxides Performance evaluation Performance evaluation
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| GB/T 7714 | Xu, Song , Niu, Xiangjie , Wang, Jiazhu et al. Investigation on aging resistance performance of asphalt modified with organic layered double hydroxides and antioxidants [J]. | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2025 , 725 . |
| MLA | Xu, Song et al. "Investigation on aging resistance performance of asphalt modified with organic layered double hydroxides and antioxidants" . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 725 (2025) . |
| APA | Xu, Song , Niu, Xiangjie , Wang, Jiazhu , Cai, Shaoxu , Ma, Hongyan , Fang, Lei et al. Investigation on aging resistance performance of asphalt modified with organic layered double hydroxides and antioxidants . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2025 , 725 . |
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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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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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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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