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学者姓名：路德春
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摘要 ：
作为衡量土力学特性的关键指标,相对密实度也是划分围岩等级的重要指标,其对隧道掘进时地层沉降和应力的影响十分重大。基于北京工业大学自主开发的盾构隧道掘进模型试验平台,通过开展不同相对密实度土层中隧道的掘进试验,系统测量地表和地层中的沉降和隧道周边的应力。试验结果表明:随着相对密实度的增大,地表和地层中沉降槽的形状由高斯函数分布形变为三角形,深度和宽度均越来越小;掘进过程中地表沉降的出现更加滞后;拱顶和拱肩处的应力路径变得越来越陡,使土体出现明显的剪胀,从而导致地层沉降槽的形状发生上述变化。因此,在模拟隧道掘进时,应考虑不同相对密实度土层的剪胀性,才能合理地预测地表的沉降。
关键词 ：
沉降 沉降 模型试验 模型试验 盾构隧道 盾构隧道 相对密实度 相对密实度 应力路径 应力路径 剪胀性 剪胀性
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| GB/T 7714 | 阿卜杜拉-穆塔里伯·凯特玛斯 , 田雨 , 路德春 et al. 围岩相对密实度对隧道掘进时地层沉降的影响 [J]. | 工业建筑 , 2021 , 51 (07) : 11-17 . |
| MLA | 阿卜杜拉-穆塔里伯·凯特玛斯 et al. "围岩相对密实度对隧道掘进时地层沉降的影响" . | 工业建筑 51 . 07 (2021) : 11-17 . |
| APA | 阿卜杜拉-穆塔里伯·凯特玛斯 , 田雨 , 路德春 , 杜修力 . 围岩相对密实度对隧道掘进时地层沉降的影响 . | 工业建筑 , 2021 , 51 (07) , 11-17 . |
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摘要 ：
<正>2021年是中国共产党成立100周年,《北京工业大学学报》出版一期土木工程学科专刊,谨贺中国共产党百年华诞!党中央历来高度重视防灾减灾工作,就防震减灾做出了一系列重要指示批示。中国地震局专门印发了全国地震灾害风险防范工作的通知,对进一步做好抗震救灾业务支撑指明了方向、提供了遵循。
关键词 ：
土木工程学科 土木工程学科 防灾减灾 防灾减灾
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| GB/T 7714 | 路德春 . 序言 [J]. | 北京工业大学学报 , 2021 , 47 (07) : 666 . |
| MLA | 路德春 . "序言" . | 北京工业大学学报 47 . 07 (2021) : 666 . |
| APA | 路德春 . 序言 . | 北京工业大学学报 , 2021 , 47 (07) , 666 . |
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摘要 ：
鉴于目前城市地下铁路隧道平行、交叠的情况逐年增加,且对多列车耦合荷载作用下地表振动规律尚不清楚,本文建立了大直径盾构隧道下穿双线地铁隧道三维数值分析模型,并通过现有运行列车参数建立了刚体列车模型以及实体轨道模型。采用Hertz接触模拟了运动列车轮与钢轨的接触,通过罚接触与硬接触模拟了隧道与围岩的非线性接触,利用无限元人工边界模拟了无限半空间。使用时域显式整体分析方法模拟了编组列车在隧道内的运行并与实测地表振动加速度结果进行了对比,结果表明本文建立的数值模型能够较好地反映出真实地铁列车运行时地表的振动响应。在此基础上,分析了多线隧道交汇段不同列车运行工况下地表竖向加速度的时频特性以及分布规律。
关键词 ：
交叠隧道 交叠隧道 动力响应 动力响应 平行隧道 平行隧道 时域显式整体分析方法 时域显式整体分析方法 环境振动 环境振动
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| GB/T 7714 | 路德春 , 马一丁 , 王国盛 . 近接隧道列车运行时地表振动响应数值模拟 [J]. | 吉林大学学报(地球科学版) , 2021 , 51 (05) : 1452-1462 . |
| MLA | 路德春 et al. "近接隧道列车运行时地表振动响应数值模拟" . | 吉林大学学报(地球科学版) 51 . 05 (2021) : 1452-1462 . |
| APA | 路德春 , 马一丁 , 王国盛 . 近接隧道列车运行时地表振动响应数值模拟 . | 吉林大学学报(地球科学版) , 2021 , 51 (05) , 1452-1462 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
以实际工程为背景,设计了具有单一卵石层和2个既有隧道的试验模型.基于自主研发的土压平衡盾构试验平台,开展了卵石地层盾构下穿既有马蹄形隧道和矩形隧道的模型试验.在试验过程中,记录了盾构机的施工动力和排土量,同时监测了试验模型的地表沉降,以及既有隧道的应变和作用在其上的土压力.通过盾构机施工动力和排土量的变化,分析了既有隧道对盾构施工状态的影响.利用盾构下穿过程中盾构排土量的变化,解释了既有隧道周围卵石土体发生塌落破坏的原因.基于实测的地表沉降和作用在既有隧道上土压力的变化规律,揭示了盾构下穿过程中既有隧道与卵石土体的相互作用机理.
关键词 ：
卵石地层 卵石地层 地表沉降 地表沉降 既有隧道 既有隧道 模型试验 模型试验 盾构下穿 盾构下穿 隧道变形 隧道变形
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| GB/T 7714 | 林庆涛 , 路德春 , 雷春明 et al. 下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究 [J]. | 北京工业大学学报 , 2021 , 47 (04) : 328-337 . |
| MLA | 林庆涛 et al. "下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究" . | 北京工业大学学报 47 . 04 (2021) : 328-337 . |
| APA | 林庆涛 , 路德春 , 雷春明 , 李晓强 , 苗金波 , 龚秋明 et al. 下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究 . | 北京工业大学学报 , 2021 , 47 (04) , 328-337 . |
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摘要 ：
This study investigates the inelastic displacement of structures subjected to earthquake-tsunami loadings. The relative intensity is defined as the ratio of the tsunami force per unit mass to the S-a of the corresponding ground motion. The effects of the hysteretic model, soil condition, post-yield stiffness, damping, and relative intensity on the inelastic displacement ratios are investigated. The results show that, compared to earthquakes alone, earthquake-tsunami loadings can enlarge the inelastic displacement ratio demands, especially for higher relative intensities. A predictive model is developed by considering several parameters, which may be used in the framework of performance-based seismic design.
关键词 ：
constant ductility constant ductility earthquake-tsunami earthquake-tsunami Inelastic displacement ratio Inelastic displacement ratio predictive model predictive model SDOF structure SDOF structure
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| GB/T 7714 | Ji, Duofa , Wen, Weiping , Zhai, Changhai et al. Inelastic Displacement Ratios for SDOF Structures Subjected to Earthquake-tsunami Loadings [J]. | JOURNAL OF EARTHQUAKE ENGINEERING , 2021 . |
| MLA | Ji, Duofa et al. "Inelastic Displacement Ratios for SDOF Structures Subjected to Earthquake-tsunami Loadings" . | JOURNAL OF EARTHQUAKE ENGINEERING (2021) . |
| APA | Ji, Duofa , Wen, Weiping , Zhai, Changhai , Lu, Dechun . Inelastic Displacement Ratios for SDOF Structures Subjected to Earthquake-tsunami Loadings . | JOURNAL OF EARTHQUAKE ENGINEERING , 2021 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究
关键词 ：
卵石地层 卵石地层 地表沉降 地表沉降 既有隧道 既有隧道 模型试验 模型试验 盾构下穿 盾构下穿 隧道变形 隧道变形
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| GB/T 7714 | 路德春 , 雷春明 , 李晓强 et al. 下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究 [J]. | 路德春 , 2021 , 47 (4) : 328-337 . |
| MLA | 路德春 et al. "下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究" . | 路德春 47 . 4 (2021) : 328-337 . |
| APA | 路德春 , 雷春明 , 李晓强 , 苗金波 , 龚秋明 , 杜修力 et al. 下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究 . | 路德春 , 2021 , 47 (4) , 328-337 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
A new concept called the transmission ratio of ground volume loss (TRGVL) is proposed to describe the variation law of ground volume loss with depth above the tunnel. Based on the developed Gaussian function, the formula for TRGVL is deduced. Further, the first-order derivative of TRGVL is presented to evaluate the dilation and compression degree of the soil at any depth above the tunnel. A total of 15 cases, involving eight field project cases and seven model test cases, are investigated to validate rationality of the proposed formula. The results of field projects and model test cases indicate variation in TRGVL presents four forms. By analysing the volumetric deformation of the soil above the tunnel, formation mechanism of the each form of TRGVL is revealed. Finally, the evolution of the four forms of TRGVL is used to evaluate the disturbance degree of the soil above the tunnel.
关键词 ：
Developed Gaussian function Developed Gaussian function Ground volume loss Ground volume loss Soil volumetric deformation Soil volumetric deformation Surface and subsurface settlement Surface and subsurface settlement Tunnel excavation Tunnel excavation
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| GB/T 7714 | Lin, Qingtao , Tian, Yu , Lu, Dechun et al. A prediction method of ground volume loss variation with depth induced by tunnel excavation [J]. | ACTA GEOTECHNICA , 2021 , 16 (11) : 3689-3707 . |
| MLA | Lin, Qingtao et al. "A prediction method of ground volume loss variation with depth induced by tunnel excavation" . | ACTA GEOTECHNICA 16 . 11 (2021) : 3689-3707 . |
| APA | Lin, Qingtao , Tian, Yu , Lu, Dechun , Gong, Qiuming , Du, Xiuli , Gao, Zhiwei . A prediction method of ground volume loss variation with depth induced by tunnel excavation . | ACTA GEOTECHNICA , 2021 , 16 (11) , 3689-3707 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Many advanced constitutive models which can capture the strain-softening and state-dependent dilatancy response of sand have been developed. These models can give good prediction of the single soil element behaviour under various loading conditions. But the solution will be highly mesh-dependent when they are used in real boundary value problems due to the strain-softening. They can give mesh-dependent strain localization pattern and bearing capacity of foundations on sand. Nonlocal regularization of an anisotropic critical state sand model is presented. The evolution of void ratio which has a significant influence on strain-softening is assumed to depend on the volumetric strain increment of both the local and neighbouring integration points. The regularization method has been implemented using the explicit stress integration method. The nonlocal model has been used in simulating both drained plane strain compression and the response of a strip footing on dry sand. In plane strain compression, mesh-independent results for the force-displacement relationship and shear band thickness can be obtained when the mesh size is smaller than the internal length. The force-displacement relationship of strip footings predicted by the nonlocal model is much less mesh-sensitive than the local model prediction. The strain localization under the strip footing predicted by the nonlocal model is mesh independent. The regularization method is thus proper for application in practical geotechnical engineering problems.
关键词 ：
Critical state Critical state Mesh-dependency Mesh-dependency Nonlocal regularization Nonlocal regularization Sand anisotropy Sand anisotropy Strain localization Strain localization
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| GB/T 7714 | Gao, Zhiwei , Li, Xin , Lu, Dechun . Nonlocal regularization of an anisotropic critical state model for sand [J]. | ACTA GEOTECHNICA , 2021 . |
| MLA | Gao, Zhiwei et al. "Nonlocal regularization of an anisotropic critical state model for sand" . | ACTA GEOTECHNICA (2021) . |
| APA | Gao, Zhiwei , Li, Xin , Lu, Dechun . Nonlocal regularization of an anisotropic critical state model for sand . | ACTA GEOTECHNICA , 2021 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The physical mechanism of the static-dynamic combined (S-DC) multiaxial strength of concrete is investigated considering cohesive and frictional strength. It is determined that the strain rate effects and stress state effects on the shear strength of concrete can be decoupled. An effective initial static stress is defined to distinguish the part of the cohesive strength that is dependent on the strain rate; the other part is consumed by the initial static stress. Furthermore, the strength parameter, which reflects the coupled effects of the initial static stress and the strain rate on the strength, is obtained based on the effective initial static stress and dynamic increase factor (DIF). Combining the proposed strength parameter and nonlinear dynamic multiaxial strength criterion, a new S-DC multiaxial strength criterion for concrete is presented. The proposed strength criterion is applied to analyze the S-DC strength rules of concrete under multiaxial stress conditions and is further verified using five groups of test results. (C) 2021 American Society of Civil Engineers.
关键词 ：
Cohesive-frictional Cohesive-frictional Concrete Concrete Initial static stress Initial static stress Static-dynamic combined strength Static-dynamic combined strength Strain rate effect Strain rate effect
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| GB/T 7714 | Wang, Guosheng , Lu, Dechun , Li, Meng et al. Static-Dynamic Combined Multiaxial Strength Criterion for Concrete [J]. | JOURNAL OF ENGINEERING MECHANICS , 2021 , 147 (5) . |
| MLA | Wang, Guosheng et al. "Static-Dynamic Combined Multiaxial Strength Criterion for Concrete" . | JOURNAL OF ENGINEERING MECHANICS 147 . 5 (2021) . |
| APA | Wang, Guosheng , Lu, Dechun , Li, Meng , Zhou, Xin , Wang, Jinting , Du, Xiuli . Static-Dynamic Combined Multiaxial Strength Criterion for Concrete . | JOURNAL OF ENGINEERING MECHANICS , 2021 , 147 (5) . |
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摘要 ：
The excavation disturbed zone plays an important role in the evaluation of tunnel stability. The identification of the excavation disturbed zone is perceived as a main concern. Taking the material meso-structure into account, this paper investigates the construction mechanical behavior in heterogeneous sand cobble stratum and aims to precisely predict the excavation disturbed zone. Firstly, the meso-scale numerical models were used to simulate tunnel excavation in sandy cobble strata, in which the large-sized rock blocks and fine-grained soil matrix were treated as separate constituents. Then, the stress redistribution and deformation performance in the ground during tunneling were explored in detail. Subsequently, combined with the deformation performance characteristics, a method for identifying the excavation disturbed zone was proposed. The boundary of the excavation disturbed zone can be identified by the displacement mutation point of the monitoring paths. Finally, a parametric study was performed to understand the influence of key factors on the excavation disturbed zone, including the rock meso-structure parameters, the soil matrix properties, and the tunnel geometry characteristics. The simulation results indicate that both the rock content and rock size have a significant impact on the excavation disturbed zone, the strength parameters and lateral pressure coefficient have a marked effect, and the tunnel radius and tunnel burial depth have a negligible influence on the excavation disturbed zone under the given conditions when normalized.
关键词 ：
Excavation disturbed zone Excavation disturbed zone Heterogeneity Heterogeneity Material meso-structure Material meso-structure Mesoscale numerical method Mesoscale numerical method Sandy cobble stratum Sandy cobble stratum
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| GB/T 7714 | Zhang, Pei , Du, Xiuli , Lu, Dechun et al. Study on the excavation disturbed zone during tunneling in sandy cobble stratum considering the material meso-structure [J]. | TRANSPORTATION GEOTECHNICS , 2021 , 29 . |
| MLA | Zhang, Pei et al. "Study on the excavation disturbed zone during tunneling in sandy cobble stratum considering the material meso-structure" . | TRANSPORTATION GEOTECHNICS 29 (2021) . |
| APA | Zhang, Pei , Du, Xiuli , Lu, Dechun , Jin, Liu , Qi, Jilin . Study on the excavation disturbed zone during tunneling in sandy cobble stratum considering the material meso-structure . | TRANSPORTATION GEOTECHNICS , 2021 , 29 . |
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