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学者姓名：马宏岩
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Abstract ：
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 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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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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基于四参数随机生长法（QSGS）以及改进QSGS方法等效重构三维（3D）各向同性/各向异性土体内部孔隙结构，结合格子玻尔兹曼方法（LBM），采用MATLAB自编程序进行细观渗流场数值模拟，分析不同孔隙参数及模型各向异性等因素对渗流特性的影响规律.结果表明：3D模型尺寸100×100×100格点时，连通孔隙率nc达到最大增幅19.23%.流体易在连通性好、孔喉直径大的部位形成主渗流通道，且存在“指进效应”，流体越靠近孔道中轴线流速越快. 3D重构土体的计算渗透率k随模型孔隙率n增大而增大，随土颗粒尺寸减小而减小，当分布概率pc=0～0.05（大、中颗粒）时渗透率显著降低，降低幅度达42.86%.考虑各向异性的重构模型出口边界渗流速度波动幅度较大、变化趋势规律性不明显，且流线分布稀疏、相互交错、主渗流通道不明显.该研究能揭示流体在3D土体孔隙结构中的流动规律，并为3D土体重构和细观渗流模拟研究方法提供借鉴.
Keyword ：
各向异性 各向异性 四参数随机生长法 四参数随机生长法 格子玻尔兹曼 格子玻尔兹曼 细观渗流 细观渗流 计算渗透率 计算渗透率
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| GB/T 7714 | 阙云 , 邱婷 , 蔡沛辰 et al. 基于QSGS法3D重构土体渗流场的LBM数值模拟 [J]. | 湖南大学学报(自然科学版) , 2023 , 50 (09) : 119-130 . |
| MLA | 阙云 et al. "基于QSGS法3D重构土体渗流场的LBM数值模拟" . | 湖南大学学报(自然科学版) 50 . 09 (2023) : 119-130 . |
| APA | 阙云 , 邱婷 , 蔡沛辰 , 马宏岩 , 谢秀栋 , 薛斌 . 基于QSGS法3D重构土体渗流场的LBM数值模拟 . | 湖南大学学报(自然科学版) , 2023 , 50 (09) , 119-130 . |
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针对云南农村公路开展足尺寸模型实验，研究轻型交通量情况下水泥混凝土路面结构，探寻一种典型的、性价比高且可普遍适用的路面结构.通过测量模型承载力，深入分析典型结构的承载性能，验证典型结构的适用性.结果表明，农村公路应优先选用强度较高的基层形式并减小板厚.
Keyword ：
典型结构 典型结构 农村公路 农村公路 承载力 承载力 水泥混凝土路面 水泥混凝土路面
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| GB/T 7714 | 陈亮亮 , 常赛 , 苏文韬 et al. 农村公路水泥混凝土典型路面结构设计和承载力试验 [J]. | 福州大学学报(自然科学版) , 2023 , 51 (02) : 199-204 . |
| MLA | 陈亮亮 et al. "农村公路水泥混凝土典型路面结构设计和承载力试验" . | 福州大学学报(自然科学版) 51 . 02 (2023) : 199-204 . |
| APA | 陈亮亮 , 常赛 , 苏文韬 , 马宏岩 . 农村公路水泥混凝土典型路面结构设计和承载力试验 . | 福州大学学报(自然科学版) , 2023 , 51 (02) , 199-204 . |
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To understand the relationship between the surface color and ageing of asphalt, the evaluation method for asphalt surface color was established with the color parameter of Munsell Value, then two asphalts were adopted to study the influence of asphalt ageing on its surface color, and the mechanism of whitening was investigated by the four generic fractions experiment, color spectrum tests and scanning electron microscopy (SEM) test. The results show that the surface color of asphalt will be changed by some factors, while ageing is an important factor. The thermal-oxidative ageing (TOA) of asphalt would lead to the asphalt to be darker in color due to the component migration caused by ageing, while the ultraviolet ageing (UVA) of asphalt will result in a grey or white asphalt surface because of the fact that UVA makes the surface wrinkled and rough which would cause the asphalt surface to change from specular reflection to diffuse reflection. Since the whitening of asphalt surface caused by UVA is much more serious than the blacking caused by TOA, the asphalt pavement always tends to appear grey or white during its service life. To verify the close relationship between the surface color and UVA degree of asphalt, two modified asphalts with anti-ultraviolet ageing agents, carbon black and layered double hydroxides, were suffered from UVA, and their ageing degrees were assessed with the parameters of Munsell Value and conventional physical properties, results indicate the two evaluations on UVA degree have much consistency, which means it is feasible to adopt Munsell Value, a parameter of asphalt surface color, to evaluate the UV ageing degree of asphalt.
Keyword ：
ageing degree evaluation ageing degree evaluation asphalt asphalt Munsell value Munsell value surface color surface color ultraviolet ageing ultraviolet ageing whitening whitening
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| GB/T 7714 | Xu, Song , Wang, Chuan , Wang, Yefei et al. Evaluation of asphalt ageing degree based on asphalt color [J]. | ENGINEERING RESEARCH EXPRESS , 2023 , 5 (1) . |
| MLA | Xu, Song et al. "Evaluation of asphalt ageing degree based on asphalt color" . | ENGINEERING RESEARCH EXPRESS 5 . 1 (2023) . |
| APA | Xu, Song , Wang, Chuan , Wang, Yefei , Yao, Qiongfang , Ma, Hongyan , Jia, Xiaojuan et al. Evaluation of asphalt ageing degree based on asphalt color . | ENGINEERING RESEARCH EXPRESS , 2023 , 5 (1) . |
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Sodium dodecyl sulfate (SDS) intercalated layered double hydroxides (LDHs) were prepared to enhance the ageing resistance of SBS modified bitumen (SMB). X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) showed that SDS has been intercalated into the interlayers of LDHs. Compared to LDHs, the interaction between SDS intercalated LDHs (OLDHs) and SMB was obviously stronger, and OLDHs exhibited better dispersity and stability in SMB. After ageing, the viscoelastic properties of SMB were deteriorated. LDHs and OLDHs could obviously alleviate the deterioration of ageing on the properties of SMB, which could improve the ageing resistance of SMB, especially OLDHs. Additionally, the enhancement mechanisms of OLDHs and LDHs for the ageing resistance of SMB at the microscopic scale were investigated by molecular dynamics. The incor-poration of LDHs could obstruct the invasion of oxygen into the interior of SMB and inhibit the diffusion rate of oxygen in SMB, which reduced the oxidation reaction probability of SMB during ageing, and eventually achieved the improvement on ageing resistance of SMB. The effectiveness of LDHs was further improved after SDS intercalated modification, that was, SDS intercalated modification was beneficial to enhance the ageing resis-tance of LDHs for SMB.
Keyword ：
Ageing resistance Ageing resistance Intercalated modification Intercalated modification Layered double hydroxides Layered double hydroxides Molecular dynamics Molecular dynamics SBS modified bitumen SBS modified bitumen
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| GB/T 7714 | Zhang, Canlin , Li, Yifei , Wang, Ting et al. Multi-scale evaluation of sodium dodecyl sulfate intercalated LDHs on the ageing resistance of SBS modified bitumen [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 406 . |
| MLA | Zhang, Canlin et al. "Multi-scale evaluation of sodium dodecyl sulfate intercalated LDHs on the ageing resistance of SBS modified bitumen" . | CONSTRUCTION AND BUILDING MATERIALS 406 (2023) . |
| APA | Zhang, Canlin , Li, Yifei , Wang, Ting , Xu, Song , Ma, Hongyan , Fang, Lei et al. Multi-scale evaluation of sodium dodecyl sulfate intercalated LDHs on the ageing resistance of SBS modified bitumen . | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 406 . |
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The quartet structure generation set（QSGS），as well as improved QSGS，were used to equivalently reconstruct the three-dimension（3D）isotropy and anisotropy pore structure of the real soil. Combined with the lattice Boltzmann method（LBM），the numerical simulation of the seepage field employing the MATLAB automatic program was carried out to explore the influence of different pore parameters and model anisotropy on seepage characteristics. The results showed that when the mesh size of the 3D model was 100×100×100，the maximum increase of pore connectivity rate nc reached 19.23 %. The fluid preferred to form the main seepage channel in the position with good connectivity and large pore throat diameter，and there was a“finger-in”effect. The closer the fluid was to the axis of the channel，the greater the flow velocity was. The calculated permeability k of 3D reconstructed soil increased with the increase of model porosity n and decreased with the decrease of soil particle size. When the distribution probability Pc was 0~0.05，the permeability k decreased significantly，and the reduction was 42.86%. The seepage velocity at the outlet boundary of the reconstructed model considering anisotropy fluctuated greatly and irregularly. The streamline distribution streamline sparse and interlaced，with no prominent main seepage channel. This study can better reveal the flow law of fluid in the 3D pore structure and provide some references for the research methods of 3D soil reconstruction and meso-seepage simulation. © 2023 Hunan University. All rights reserved.
Keyword ：
anisotropy anisotropy calculate permeability calculate permeability Lattice Boltzmann Lattice Boltzmann meso-seepage meso-seepage quartet structure generation set quartet structure generation set
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| GB/T 7714 | Que, Y. , Qiu, T. , Cai, P. et al. LBM Numerical Simulation of Seepage Field of 3D Reconstructed Soil Based on QSGS Method; [基 于 QSGS 法 3D 重 构 土 体 渗 流 场 的 LBM 数 值 模 拟] [J]. | Journal of Hunan University Natural Sciences , 2023 , 50 (9) : 119-130 . |
| MLA | Que, Y. et al. "LBM Numerical Simulation of Seepage Field of 3D Reconstructed Soil Based on QSGS Method; [基 于 QSGS 法 3D 重 构 土 体 渗 流 场 的 LBM 数 值 模 拟]" . | Journal of Hunan University Natural Sciences 50 . 9 (2023) : 119-130 . |
| APA | Que, Y. , Qiu, T. , Cai, P. , Ma, H. , Xie, X. , Xue, B. . LBM Numerical Simulation of Seepage Field of 3D Reconstructed Soil Based on QSGS Method; [基 于 QSGS 法 3D 重 构 土 体 渗 流 场 的 LBM 数 值 模 拟] . | Journal of Hunan University Natural Sciences , 2023 , 50 (9) , 119-130 . |
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To address the strength damage of red clay under dry-wet cycles, systematic conventional triaxial tests under specific circumferential pressure and scanning electron microscope observation were carried out to describe the damage evolution of soil units under load conditions of dry-wet cycle red clay microunits based on the Weibull distribution. Damage variable expressions obeying the Weibull distribution were established and the micro-parameter pore area ratio and the macro-parameter dry-wet cycle number were introduced. The cross-scale characterization of macroscopic and microscopic parameters was realized by combining the damage mechanics equation of red clay under loading. The microscopic damage intrinsic model of red clay considering the number of dry-wet cycles was constructed. The model was verified to be reasonable and effective based on triaxial tests, in which the calculation errors of the secant modulus damage threshold, probability density function shape parameter, and dry-wet cycle red clay damage stress were within 10 %, 5 %, and 5 %, respectively.
Keyword ：
damage intrinsic model damage intrinsic model dry-wet cycles dry-wet cycles microscopy microscopy red clay red clay scanning electron scanning electron triaxial test triaxial test Weibull distribution Weibull distribution
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| GB/T 7714 | Ma, Hongyan , Duan, Zhibao , Zhang, Tianfu et al. Micro-constructive Damage Model of Dry-Wet Cyclic Red Clay Based on Weibull Distribution [J]. | JOURNAL OF TESTING AND EVALUATION , 2023 , 52 (2) : 1095-1108 . |
| MLA | Ma, Hongyan et al. "Micro-constructive Damage Model of Dry-Wet Cyclic Red Clay Based on Weibull Distribution" . | JOURNAL OF TESTING AND EVALUATION 52 . 2 (2023) : 1095-1108 . |
| APA | Ma, Hongyan , Duan, Zhibao , Zhang, Tianfu , Xu, Song , Lv, Mengxi . Micro-constructive Damage Model of Dry-Wet Cyclic Red Clay Based on Weibull Distribution . | JOURNAL OF TESTING AND EVALUATION , 2023 , 52 (2) , 1095-1108 . |
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