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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 . |
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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 . |
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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 ：
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 ：
Great efforts have been conducted to investigate the seismic performances of the arch and rectangular underground structures, however, the differences between seismic responses of these two types of underground structures, especially the vault radian influencing the seismic responses of arch structures are not clarified. This paper presents a detailed numerical investigation on the seismic responses of arch underground structures with different vault radians, and aims to illustrate the rule that vault radian affects the seismic responses of underground structures. Five arch underground structures are built for nonlinear soil-structure interaction analysis. The internal forces of the structural components of the underground structures only under gravity are discussed detailedly, and an optimum vault radian for perfect load-carrying functionality of arch underground structures is suggested. Then the structures are analyzed under seven scaled ground motions, amounting to a total of 35 dynamic calculations. The numerical results show that the vault radian can have beneficial effects on the seismic response of the arch structure, compared to the rectangular underground structures, causing the central columns to suffer smaller axial force and horizontal deformation. The conclusions provide some directive suggestions for the seismic design of the arch underground structures.
关键词 ：
arch underground structures arch underground structures optimum radian optimum radian seismic performance seismic performance static analysis static analysis vault radian vault radian
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| GB/T 7714 | Ma, Chao , Lu, Dechun , Qi, Chengzhi et al. Radian of the vault influencing the seismic performances of straight wall arch underground structures [J]. | STRUCTURAL ENGINEERING AND MECHANICS , 2021 , 78 (5) : 637-649 . |
| MLA | Ma, Chao et al. "Radian of the vault influencing the seismic performances of straight wall arch underground structures" . | STRUCTURAL ENGINEERING AND MECHANICS 78 . 5 (2021) : 637-649 . |
| APA | Ma, Chao , Lu, Dechun , Qi, Chengzhi , Du, Xiuli . Radian of the vault influencing the seismic performances of straight wall arch underground structures . | STRUCTURAL ENGINEERING AND MECHANICS , 2021 , 78 (5) , 637-649 . |
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摘要 ：
Seismic failure mechanism of underground frame structures presents that the collapse of underground structures attributes to the insufficient seismic resistance of central columns. Therefore, researches have been conducted to improve the seismic performance of underground structures by enhancing the loading-carrying capacity of the central columns or decreasing the seismic loads transmitted to central columns. For this purpose, this study proposed a new approach by changing the connection type between sidewalls and slab: setting shock absorbing gap (SAG) between sidewalls and ceiling slab, which aims to decrease seismic loads transmitted to central columns. The proposal and working mechanism of SAG were illustrated detailedly. Afterwards, nonlinear finite element models, in which a developed elastoplastic constitutive model was used to simulate the 3D strength and softening behaviour of surrounding soils, were built for simulating the static and dynamic responses of underground structures. Based on the numerical results, SAG affecting the internal forces of structural components before earthquakes were discussed firstly. Then the seismic efficiency of SAG updating the seismic performance of underground frame structures was analyzed by discussing earthquake-induced damage mode of overall structures, soil pressure on structures, earthquake-induced deformations and internal forces of structural components. Finally, the seismic performance of underground frame structures influenced by the width of SAG and frictional coefficient of the sliding surface was investigated, and advice for reasonably using SAG was suggested.
关键词 ：
Parametric analysis Parametric analysis Seismic performance Seismic performance Shock absorbing gap Shock absorbing gap Soil-structure flexibility Soil-structure flexibility Underground frame structures Underground frame structures
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| GB/T 7714 | Ma, Chao , Lu, Dechun , Gao, Hui et al. Seismic performance improvement of underground frame structures by changing connection type between sidewalls and slab [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2021 , 149 . |
| MLA | Ma, Chao et al. "Seismic performance improvement of underground frame structures by changing connection type between sidewalls and slab" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 149 (2021) . |
| APA | Ma, Chao , Lu, Dechun , Gao, Hui , Du, Xiuli , Qi, Chengzhi . Seismic performance improvement of underground frame structures by changing connection type between sidewalls and slab . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2021 , 149 . |
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摘要 ：
A unified stress function is represented in a Fourier series to capture the complex stress state of an underwater shallow tunnel perimeter. The first-order unified stress function is employed as stress boundary condition of the tunnel perimeter (SBCTP) to describe the non-symmetrical stress with respect to the horizontal and vertical centerlines of the tunnel. The mechanical analysis model of an underwater shallow tunnel is established. Combining the complex variable theory, the elastic analytical solution of the stress and displacement are obtained. The rationality of the elastic solution is verified by comparing the stress fields between the proposed method and the finite element method (FEM). Based on the obtained elastic solution, the fractional viscoelastic solution is determined by the correspondence principle. The time-dependent ground displacement are investigated considering the effect of stress release. A series of parameter analyses are carried out to discuss the ground vertical and horizontal stress distributions under the influences of SBCTPs. © 2020 Elsevier Ltd
关键词 ：
Fourier series Fourier series Stresses Stresses
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| GB/T 7714 | Kong, Fanchao , Lu, Dechun , Du, Xiuli et al. Analytical solution of stress and displacement for a circular underwater shallow tunnel based on a unified stress function [J]. | Ocean Engineering , 2021 , 219 . |
| MLA | Kong, Fanchao et al. "Analytical solution of stress and displacement for a circular underwater shallow tunnel based on a unified stress function" . | Ocean Engineering 219 (2021) . |
| APA | Kong, Fanchao , Lu, Dechun , Du, Xiuli , Li, Xiaoqiang , Su, Cancan . Analytical solution of stress and displacement for a circular underwater shallow tunnel based on a unified stress function . | Ocean Engineering , 2021 , 219 . |
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