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学者姓名：赖丰文
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Abstract ：
Soil conditioning of gravel-clay strata using foams for earth pressure balance (EPB) shield tunnelling is less well understood compared to conditioning for clay or sand strata. This lack of understanding can lead to muck clogging at the cutting wheel and increased wear on cutter tools. To address these issues, this study introduces the response surface methodology (RSM) to investigate the effects of various foaming agent components and their interactions on foam conditioning of gravel-clay strata that are widely distributed in Southeastern China. The controlled variables selected for this study include anionic surfactant sodium fatty alcohol polyoxyethylene ether sulfate, nonionic surfactant alkyl polyglycoside, foam stabilizer hollyhock gum, organic dispersant guar gum, and inorganic dispersant sodium tripolyphosphate. The responses evaluated are the foaming agent viscosity, foam volume, foam half-life time, adhesive force, and undrained shear strength. Fifty groups of laboratory tests, including apparent viscosity, Ross-Miles, liquid loss, improved cone pull-out, and vane shear tests, are conducted to characterize these responses. The surface tension measurements and microscopic observations are also performed to interpret foam performance. Ultimately, the optimal ratio of foaming agent components is determined using the desirability approach. The comparison of in-house and commercial foaming agents in both laboratory and in-situ tests, focusing on their conditioning effects on soil properties and tunnelling parameters, highlights the applicability of the proposed RSM models. This study offers new insight into the consequence and interaction of different foaming agent components and serves as a valuable reference for soil conditioning of gravel-clay strata during EPB shield tunnelling.
Keyword ：
Dispersed foam Dispersed foam EPB shield EPB shield Field application Field application Gravel-clay strata Gravel-clay strata Laboratory experiment Laboratory experiment
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| GB/T 7714 | Jin, Guixiao , Lu, Yao , Shiau, Jim S. et al. Consequence and interaction of foaming agent components on soil conditioning of gravel-clay strata for EPB shield tunnelling☆ [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2025 , 157 . |
| MLA | Jin, Guixiao et al. "Consequence and interaction of foaming agent components on soil conditioning of gravel-clay strata for EPB shield tunnelling☆" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 157 (2025) . |
| APA | Jin, Guixiao , Lu, Yao , Shiau, Jim S. , Huang, Ming , Lai, Fengwen , Feng, Mengmeng . Consequence and interaction of foaming agent components on soil conditioning of gravel-clay strata for EPB shield tunnelling☆ . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2025 , 157 . |
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Accurate determination of parameters for an advanced soil constitutive model highly relies on laboratory testing, even though it is notoriously difficult to obtain undisturbed samples for soft soils. This study explores the potential use of in situ tests, such as piezocone penetration tests (CPTU) and seismic dilatometer tests (SDMT), to estimate the constitutive model parameters. Based on a case history of a deep excavation adjacent to existing tunnels in silt/sand-dominated sediments, a calibration approach of a set of the HSSmall (Hardening Soil Model with small strain stiffness) model parameters is presented, and the derived parameters are used to numerically compute the interactive responses of tunnels and deep excavations. Several comparisons against field monitoring data indicate that the numerical model with the CPTU/SDMT-interpreted HSSmall model parameters adequately reproduces observed deformation responses of deep excavations adjacent to tunnels. However, in the considered case study, the use of laboratory tests with disturbed samples to estimate the stiffness parameters of the HSSmall model results in an overconservative solution. This finding supports the use of CPTU/SDMT to provide representative parameters for a range of soil layers, leading to the conclusion that tunnel linings may be beneficial to mitigate ground movements and wall deflections due to a "barrier" effect.
Keyword ：
deep excavation deep excavation HSSmall model HSSmall model piezocone penetration test piezocone penetration test sand/silt-dominated sediment sand/silt-dominated sediment seismic dilatometer test seismic dilatometer test tunnel tunnel
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| GB/T 7714 | Lai, Fengwen , Tschuchnigg, Franz , Schweiger, Helmut F. et al. A numerical study of deep excavations adjacent to existing tunnels: integrating CPTU and SDMT to calibrate soil constitutive model [J]. | CANADIAN GEOTECHNICAL JOURNAL , 2025 , 62 . |
| MLA | Lai, Fengwen et al. "A numerical study of deep excavations adjacent to existing tunnels: integrating CPTU and SDMT to calibrate soil constitutive model" . | CANADIAN GEOTECHNICAL JOURNAL 62 (2025) . |
| APA | Lai, Fengwen , Tschuchnigg, Franz , Schweiger, Helmut F. , Liu, Songyu , Shiau, Jim , Cai, Guojun . A numerical study of deep excavations adjacent to existing tunnels: integrating CPTU and SDMT to calibrate soil constitutive model . | CANADIAN GEOTECHNICAL JOURNAL , 2025 , 62 . |
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The determination of earth pressure is a key element for the design of retaining structures of deep excavations. However, the existing earth pressure models can not reasonably consider the change of soil properties induced by excavation activities. The piezocone penetration test (CPTU) is capable of effectively avoiding the sampling disturbance and quickly providing the continuous in-situ testing parameters of soils (cone resistance, sleeve friction, pore water pressure). Combining the CPTU tests and the displacement-based earth pressure model, the change of soil properties induced by excavations, surrounding buried structures (confined soil), soil arching effects, soil strength parameters and friction angle of the soil-structure interface are comprehensively taken into account to develop a unified earth pressure model (from active- to passive-state) under the Coulomb’s earth pressure framework. The comparisons of earth pressures obtained between 1g-/ng-model tests and the developed model are made for the validation. Subsequently, the developed model is employed in a deep excavation adjacent to a metro station in soft soils deposited in the Taihu Lake. The CPTU tests are then performed in the soils around both sides of retaining structures, of which the earth pressure and lateral deformation are also measured. The interpretation of in-situ testing results indicates that state parameters of soils significantly change due to excavations, but the effective friction angle almost remains unchanged. The further comparisons of earth pressures obtained between the measurement and the developed model indicate that the CPTU-based earth pressure model works well for a deep excavation under a complex environment, thus successfully reaching a practical application. © 2024 Chinese Society of Civil Engineering. All rights reserved.
Keyword ：
confined soil confined soil displacement-based earth pressure displacement-based earth pressure excavation disturbance excavation disturbance in-situ soil mechanics in-situ soil mechanics piezocone penetration test piezocone penetration test
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| GB/T 7714 | Liu, S. , Lai, F. , Cai, G. et al. A CPTU-based earth pressure model for deep excavations under complex environment and its practical application; [复杂环境下基于 CPTU 的深基坑土压力模型与工程应用] [J]. | Chinese Journal of Geotechnical Engineering , 2024 , 46 (8) : 1563-1572 . |
| MLA | Liu, S. et al. "A CPTU-based earth pressure model for deep excavations under complex environment and its practical application; [复杂环境下基于 CPTU 的深基坑土压力模型与工程应用]" . | Chinese Journal of Geotechnical Engineering 46 . 8 (2024) : 1563-1572 . |
| APA | Liu, S. , Lai, F. , Cai, G. , Li, H. , Lu, T. , Zhang, C. . A CPTU-based earth pressure model for deep excavations under complex environment and its practical application; [复杂环境下基于 CPTU 的深基坑土压力模型与工程应用] . | Chinese Journal of Geotechnical Engineering , 2024 , 46 (8) , 1563-1572 . |
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土压力计算是深基坑围护结构设计的重要组成部分,但现有土压力模型难以合理地考虑开挖扰动诱发土体工程性质演化影响.孔压静力触探(piezocone penetration test,CPTU)能够有效避免取样扰动,并快速提供连续的原位土测试参数(锥尖阻力、侧壁摩阻力、孔隙水压力).基于 CPTU 原位测试和位移相关土压力模型,结合库仑土压力框架,综合考虑开挖诱发土体工程性质演化、邻近地下结构(受限空间)、土拱效应、地基土强度参数和土-结构界面摩擦角等影响因素,构建了复杂环境下深基坑土压力统一计算模型(主动状态至被动状态).分别通过与室内1g模型试验和离心机试验结果对比,验证了所构建模型的准确性与合理性.进一步将所构建模型应用至太湖冲湖积相软土地区某邻近地铁车站的深基坑工程.现场分别在基坑开挖前后对围护结构的两侧(基坑内外)开展了 CPTU 原位测试,并监测得到了围护结构侧向变形与土压力变化.原位测试解译结果表明,基坑开挖显著地改变了周边土体状态参数,但对于有效内摩擦角的影响甚微.与现场所测土压力对比指出,基于 CPTU 的土压力模型能够较好地反映复杂环境下基坑土压力变化,成功实现了工程应用.
Keyword ：
位移相关土压力 位移相关土压力 原位土力学 原位土力学 受限空间 受限空间 孔压静力触探(CPTU) 孔压静力触探(CPTU) 开挖扰动 开挖扰动
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| GB/T 7714 | 刘松玉 , 赖丰文 , 蔡国军 et al. 复杂环境下基于CPTU的深基坑土压力模型与工程应用 [J]. | 岩土工程学报 , 2024 , 46 (8) : 1563-1572 . |
| MLA | 刘松玉 et al. "复杂环境下基于CPTU的深基坑土压力模型与工程应用" . | 岩土工程学报 46 . 8 (2024) : 1563-1572 . |
| APA | 刘松玉 , 赖丰文 , 蔡国军 , 李洪江 , 鲁泰山 , 张超哲 . 复杂环境下基于CPTU的深基坑土压力模型与工程应用 . | 岩土工程学报 , 2024 , 46 (8) , 1563-1572 . |
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基于机器学习预测施工期盾构刀盘前方管片上浮值，有助于及时调整盾构控制参数以缓解管片上浮病害。然而，已有模型在长时间序列预测问题的性能不足，难以精确预测盾构刀盘前方多环管片上浮值。通过考虑盾构控制、姿态参数及地层信息的影响，结合Boruta算法，确定模型输入特征；利用小波变换滤波器、CEEMDAN分解器消除时间序列数据噪声，构建了一种基于LightBGM-Informer的盾构隧道施工期管片上浮预测模型。通过南京和厦门地区某地铁盾构隧道监测数据，验证了所提模型的准确性和适用性。结果表明，所提模型预测精度较RNN、LSTM、GRU、Transformer等模型有所提升，且在地质条件不同的数据集上具有良好的泛化性；随着预测序列长度的增加，该模型的性能优势更突出，可准确预测盾构刀盘前方1-2环未施工管片的上浮值。基于SHAP方法的特征重要性分析指出，土舱压力及盾头、盾尾垂直位移对管片上浮影响显著。所提模型可为复杂环境下富水地层盾构隧道管片施工智能化控制提供理论指导。
Keyword ：
Informer模型 Informer模型 SHAP方法 SHAP方法 盾构隧道 盾构隧道 管片上浮 管片上浮 长时间序列预测问题 长时间序列预测问题
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| GB/T 7714 | 真嘉捷 , 赖丰文 , 黄明 et al. 基于LightGBM-Informer的盾构隧道管片上浮长时间序列预测模型 [J]. | 岩土力学 , 2024 , (12) . |
| MLA | 真嘉捷 et al. "基于LightGBM-Informer的盾构隧道管片上浮长时间序列预测模型" . | 岩土力学 12 (2024) . |
| APA | 真嘉捷 , 赖丰文 , 黄明 , 李爽 , 许凯 . 基于LightGBM-Informer的盾构隧道管片上浮长时间序列预测模型 . | 岩土力学 , 2024 , (12) . |
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工程上常利用水平加筋法来预防或延迟因受交通荷载和地下水等因素导致空洞坍塌而引起的临近道路的突发性破坏,起到破坏预警作用;但加筋体界面特性与作用机制相当复杂,下伏空洞加筋路基缺少完善的设计方法.通过总结国内外已有文献的研究成果,重点阐述了受空洞坍塌影响的加筋路基-路堤力学机制与作用机制,包括对路堤填土滑移面的定义、层间土拱效应、加筋体拉膜效应、塌陷区上覆填土膨胀、锚固区筋土界面摩擦及过渡区加筋体张拉力折减等方面;总结了空洞区加筋路基已有的设计方法,并进行了对比与讨论.结果表明,已有成果对受空洞坍塌影响的加筋路基-路堤荷载传递机制、渐进性破坏演变机制、沉降计算、极限承载力与稳定性问题等方面的研究仍显不足,针对加筋体上方荷载分布形式仍未形成定论,现有设计方法过于保守,并指明了进一步的研究建议,可为今后研究提供方向和参考.
Keyword ：
加筋路基 加筋路基 土工合成材料 土工合成材料 水平加筋法 水平加筋法 空洞坍塌 空洞坍塌
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| GB/T 7714 | 陈福全 , 赖丰文 , 李大勇 . 受空洞坍塌影响的加筋路基研究综述 [J]. | 岩土力学 , 2018 , 39 (9) : 3362-3376 . |
| MLA | 陈福全 et al. "受空洞坍塌影响的加筋路基研究综述" . | 岩土力学 39 . 9 (2018) : 3362-3376 . |
| APA | 陈福全 , 赖丰文 , 李大勇 . 受空洞坍塌影响的加筋路基研究综述 . | 岩土力学 , 2018 , 39 (9) , 3362-3376 . |
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低填方加筋路基对地基承载力要求较低,同时利用水平加筋法跨越尺寸较小的土洞能有效预防路堤出现突发式局部沉陷,提高路堤抗工后沉降和失稳的安全系数,正被逐步应用于岩溶土洞地区道路工程;但其作用机理复杂,现存设计方法大都偏于保守,考虑抗土洞塌陷的低填方加筋路基荷载传递机制的设计方法亟待提出.通过揭示受土洞塌陷影响的低填方加筋路基荷载传递机制,推导了考虑路基差异沉降引起土体应力偏转的竖向应力计算方法,假定塌陷区上方加筋体作用抛物线荷载,从而明晰了加筋体应力-应变状态;应对岩溶区不同形态的土洞塌陷,同时考虑设计需要满足的正常使用极限状态与承载能力极限状态,提出了抗土洞塌陷的低填方加筋路基加筋体及路堤填方高度设计方法,通过与现有设计方法的对比进行了合理性及准确性验证,可为空洞上方低填方加筋路基设计提供参考.
Keyword ：
低填方加筋路基 低填方加筋路基 加筋体 加筋体 土洞塌陷 土洞塌陷 岩溶地区 岩溶地区 荷载传递机制 荷载传递机制
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| GB/T 7714 | 陈福全 , 赖丰文 . 抗土洞塌陷的低填方加筋路基荷载传递机制及设计方法 [J]. | 岩土工程学报 , 2018 , 40 (7) : 1180-1189 . |
| MLA | 陈福全 et al. "抗土洞塌陷的低填方加筋路基荷载传递机制及设计方法" . | 岩土工程学报 40 . 7 (2018) : 1180-1189 . |
| APA | 陈福全 , 赖丰文 . 抗土洞塌陷的低填方加筋路基荷载传递机制及设计方法 . | 岩土工程学报 , 2018 , 40 (7) , 1180-1189 . |
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浅层岩溶土洞塌陷和浅埋隧道施工等时常会引发浅层地基出现局部沉陷,导致地基可能承受不完全土拱效应作用.如何定量分析不完全土拱效应对浅层地基竖向应力的影响尤为重要.统计了国内外浅层活动门试验,将浅层地基滑移面概化为塔形,同时考虑了浅层地基不同深度处土层差异沉降及主应力偏转过程.通过建立主应力偏转角与活动门相对位移之间的数量关系,量化了浅层地基不同深度对应的不完全土拱效应发挥程度,优化了考虑不完全土拱效应的浅层地基竖向应力计算方法.分析了主要参数对不完全土拱效应的影响,结果表明,随着浅层活动门高宽比及相对位移的增大,应力转移量增加,土体有效内摩擦角及滑移面倾角则相反.可为局部沉降作用下的浅层地基竖向应力计算提供理论指导.
Keyword ：
不完全土拱效应 不完全土拱效应 主应力偏转 主应力偏转 塔形滑移面 塔形滑移面 差异沉降 差异沉降 浅层地基 浅层地基
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| GB/T 7714 | 赖丰文 , 陈福全 , 万梁龙 . 考虑不完全土拱效应的浅层地基竖向应力计算 [J]. | 岩土力学 , 2018 , 39 (7) : 2546-2554 . |
| MLA | 赖丰文 et al. "考虑不完全土拱效应的浅层地基竖向应力计算" . | 岩土力学 39 . 7 (2018) : 2546-2554 . |
| APA | 赖丰文 , 陈福全 , 万梁龙 . 考虑不完全土拱效应的浅层地基竖向应力计算 . | 岩土力学 , 2018 , 39 (7) , 2546-2554 . |
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