您的检索：
学者姓名：李鹏飞
精炼检索结果：
年份
成果类型
收录类型
来源
综合
合作者
语言
清除所有精炼条件
摘要 ：
There are a large number of structural planes distributed in the surrounding rock of a tunnel, and this is one of the key factors causing a tunnel's instability. Due to different geological and historical conditions, the distribution characteristics and the occurrence of structural planes in the rock mass also have significant differences. In engineering, it is common to encounter structural planes that cut across the tunnel section and have a significant impact on the stability. The occurrence of structural planes is a key factor controlling the mechanical behavior of the surrounding rock. Based on this, laboratory uniaxial compression tests were carried out by constructing a small tunnel physical model with single structural planes of different inclination angles. A related numerical simulation analysis was also carried out. This research indicates that: (1) Under the influence of a single structural plane, the dip direction with 30 degrees-60 degrees is the most dangerous situation, and when the dip angle of the structural plane is between 38 and 88 degrees, it will slip along the structural plane. (2) According to the mechanical mechanism, there are three types of cracks: tensile cracks, shear cracks, and tensile shear cracks. According to the deformation characteristics, there are four types: tension, friction, bending, and shear. (3) There is a certain correlation between the strength of a single discontinuity rock mass and that of a multi-jointed rock mass. When the dip angle of the joints' combination is 45 degrees+60 degrees, the rock mass is in its weakest state.
关键词 ：
structural planes structural planes tunnel tunnel uniaxial compression strength uniaxial compression strength anisotropy anisotropy
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Sun, Zhijie , Li, Pengfei , Du, Xiuli et al. Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock [J]. | APPLIED SCIENCES-BASEL , 2023 , 13 (3) . |
| MLA | Sun, Zhijie et al. "Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock" . | APPLIED SCIENCES-BASEL 13 . 3 (2023) . |
| APA | Sun, Zhijie , Li, Pengfei , Du, Xiuli , Yang, Xuanyu . Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock . | APPLIED SCIENCES-BASEL , 2023 , 13 (3) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper aims at analyzing the influence of non-associated flow rule on passive face instability for shallow shield tunnels. The influence exerted by dilation angle on the limit support pressures, the failure zones and partial failure ratios is investigated by numerical simulations. Based on the failure zone obtained from numerical simulation, a log-spiral mechanism is proposed. The upper-bound theorem is employed to acquire the limit support pressures, failure zones and partial failure ratios. The analytical results indicate that dilation angle has a significant influence on the limit support pressure and failure mechanisms. Finally, by comparison with the numerical models and existing analytical models, the results indicate that the proposed log-spiral model has a certain accuracy in analyzing the face instability of blow-out.
关键词 ：
Limit analysis Limit analysis Blow-out Blow-out Shallow tunnels Shallow tunnels Numerical simulations Numerical simulations Non-associated flow rule Non-associated flow rule
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Li, Pengfei , Wei, Yingjie , Zhang, Mingju et al. Influence of non-associated flow rule on passive face instability for shallow shield tunnels [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2022 , 119 . |
| MLA | Li, Pengfei et al. "Influence of non-associated flow rule on passive face instability for shallow shield tunnels" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 119 (2022) . |
| APA | Li, Pengfei , Wei, Yingjie , Zhang, Mingju , Huang, Qingfei , Wang, Fan . Influence of non-associated flow rule on passive face instability for shallow shield tunnels . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2022 , 119 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
A large-scale 3D combined geomechanical model test is conducted in this study to investigate the mechanical characteristics for linings of asymmetrically closely-spaced twin-tunnels constructed in sandy ground. A series of experimental results (i.e., excavation and overloading) effectively reveal the mechanical features of the linings and the stress release and displacement characteristics of the sandy ground for asymmetrical twin-tunnels during the excavation and overloading under the condition of great buried depth (vertical stress) and high stress coefficient (the ratio of lateral to vertical stress). Afterward, numerical analyses are conducted by a finite difference program FLAC3D to verify experimental results. The influences of construction sequence, stress coefficient, clear distance and lining stiffness on mechanical behaviors of linings and stratum are discussed in some details. The experimental results show that during the excavation of the asymmetrically closely-spaced twin-tunnels, the linings are in a state of compression. The lining of the smaller diameter tunnel which excavated later is susceptible to bias pressure. The bending moment located on the lateral side of the larger diameter tunnel close to the smaller diameter tunnel decrease when the smaller diameter tunnel is excavated. The change of stress release direction in the middle soil pillar is the main reason that results in the change of stress state in linings. The overloading process only causes the bending moments increasing continuously, but not affect the basic distribution patterns in linings. Numerical results indicate that if the smaller diameter tunnel is excavated first, the continuous tunneling of the larger diameter tunnel will cause sharp changes in lining moment of smaller diameter tunnel, but it will not cause serious adverse effects on the existing tunnel lining (larger diameter tunnel) if the larger diameter tunnel is excavated first.
关键词 ：
Geomechanical model test Geomechanical model test Linings Linings Middle soil pillar Middle soil pillar Numerical simulation Numerical simulation Asymmetrically closely-spaced twin-tunnels Asymmetrically closely-spaced twin-tunnels
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Zheng, Hebin , Li, Pengfei , Ma, Guowei et al. Experimental investigation of mechanical characteristics for linings of twins tunnels with asymmetric cross-section [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2022 , 119 . |
| MLA | Zheng, Hebin et al. "Experimental investigation of mechanical characteristics for linings of twins tunnels with asymmetric cross-section" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 119 (2022) . |
| APA | Zheng, Hebin , Li, Pengfei , Ma, Guowei , Zhang, Qianbing . Experimental investigation of mechanical characteristics for linings of twins tunnels with asymmetric cross-section . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2022 , 119 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Carbon dots (CDs) as the advancing fluorescent carbon nanomaterial have superior potential and prospective. However, the ambiguous photoluminescence (PL) mechanism and intricate structure-function relationship become the greatest hindrances in the development and applications of CDs. Herein, red emissive CDs were synthesized in high yield from o-phenylenediamine (oPD) and catechol (CAT). The PL mechanism of the CDs is considered as the molecular state fluorophores because 5,14-dihydroquinoxalino[2,3-b] phenazine (DHQP) is separated and exhibits the same PL properties and behavior as the CDs. These include the peak position and shape of the PL emission and PL excitation and the emission dependence on pH and solvent polarity. Both of them display close PL lifetime decays. Based on these, we deduce that DHQP is the fluorophore of the red emissive CDs and the PL mechanism of CDs is similar to DHQP. During the PL emission of CDs, the electron of the molecule state can transfer to CDs. The formation process of DHQP is further confirmed by the reaction intermediates (phthalazine, dimers) and oPD. These findings provide insights into the PL mechanism of this type of CDs and may guide the further development of tunable CDs for tailored properties.
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Li, Pengfei , Xue, Shanshan , Sun, Lu et al. Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system [J]. | LIGHT-SCIENCE & APPLICATIONS , 2022 , 11 (1) . |
| MLA | Li, Pengfei et al. "Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system" . | LIGHT-SCIENCE & APPLICATIONS 11 . 1 (2022) . |
| APA | Li, Pengfei , Xue, Shanshan , Sun, Lu , Zong, Xupeng , An, Li , Qu, Dan et al. Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system . | LIGHT-SCIENCE & APPLICATIONS , 2022 , 11 (1) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper presents a meso-scale numerical modelling method to investigate the stability of tunnels in sandy cobble stratum. Using Monte Carlo simulation, Python routine is implemented to randomly generate and filter the location information of blocks including center coordinates, sizes and orientation angles, then extract and import them into CAD modelling software in batches to mesh. The problem of overlapping detection for elliptical and ellipsoidal blocks is solved based on affine transformation, achieving higher efficiency and applicability than the existing methods. Then, using the proposed numerical modelling method, convergence-confinement analysis of circular tunnels with different cover depths is performed in plane strain condition. Meanwhile, face stability analysis of shield tunnels is carried out in three-dimensional condition. Results show that sandy cobble stratum may not be in accordance with the scale-independent soil-rock mixture. Blocks with small sizes are geotechnically significant and contribute much to the overall strength. When the cover depth ratio reaches a certain level, limit support pressure remains basically unchanged due to the strong arching effect above tunnel crown, while permissible support pressure increases approximately linearly to control deformation. Compared with the multi scale model, hardening soil model considering the overall strength is suitable for the stability analysis of tunnels in sandy cobble stratum at the macro-scale with high precision, while the macro homogeneous model ignoring the presence of blocks provides a conservative (i.e. uneconomical) prediction for the design of tunnel stability.
关键词 ：
Hardening soil model Hardening soil model Meso-scale numerical modelling Meso-scale numerical modelling Sandy cobble stratum Sandy cobble stratum Convergence-confinement method Convergence-confinement method Affine transformation Affine transformation
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Wang, Fan , Du, Xiuli , Li, Pengfei et al. A meso-scale numerical modelling method for the stability analysis of tunnels in sandy cobble stratum [J]. | TRANSPORTATION GEOTECHNICS , 2022 , 38 . |
| MLA | Wang, Fan et al. "A meso-scale numerical modelling method for the stability analysis of tunnels in sandy cobble stratum" . | TRANSPORTATION GEOTECHNICS 38 (2022) . |
| APA | Wang, Fan , Du, Xiuli , Li, Pengfei , Hou, Shiwei . A meso-scale numerical modelling method for the stability analysis of tunnels in sandy cobble stratum . | TRANSPORTATION GEOTECHNICS , 2022 , 38 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
By combining model testing and numerical simulation, this paper focuses on the influence of landslides on tunnels in loess-bedrock strata by using the perfect landslide-tunnel system (LTS). A mechanical test and simulation (MTS) system was used to provide thrust for loading and unloading the trailing edge of the slope. A Particle Image Velocimetry (PIV) and 32 cluster strain gauges were adopted to monitor the deformation of the tunnel structure and landslide soil, and the sliding surface, respectively. By means of a numerical simulation, the deformation characteristics of a tunnel crossing loess-bedrock strata are comprehensively described. The influence of a cyclic load on the mechanical behavior and displacement of the tunnel and sliding surface is discussed in detail. The experimental results show that the thrust required for the first landslide is the largest, during multiple loading and unloading. With the increase in loading and unloading time, the sliding thrust gradually decreases and eventually remains stable. The landslide presents a progressive failure mode. There is a stress concentration in the upper part of the tunnel, which causes the secondary sliding phenomenon. The deformation of the sliding surface mainly occurs in the upper soil of the tunnel. The deformation direction of the tunnel is consistent with the sliding direction, and the deformation of the sliding surface mainly occurs in the soil above the tunnel. When disturbed by an external force, the tunnel deforms downward, and, when unloaded, the tunnel has a small rebound deformation. However, with the increase in loading-unloading times, the rebound deformation of the tunnel gradually decreases, and the permanent deformation gradually accumulates until the tunnel fails. The research results can provide reference for the construction and protection of tunnel engineering in loess regions, and have reference value for the control of tunnels crossing landslides.
关键词 ：
deformation characteristics deformation characteristics model test model test tunnel tunnel stick-slip stick-slip loess-bedrock landslide loess-bedrock landslide
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Sun, Zhijie , Yang, Xuanyu , Lu, Shuai et al. Influence of a Landslide on a Tunnel in Loess-Bedrock Ground [J]. | APPLIED SCIENCES-BASEL , 2022 , 12 (13) . |
| MLA | Sun, Zhijie et al. "Influence of a Landslide on a Tunnel in Loess-Bedrock Ground" . | APPLIED SCIENCES-BASEL 12 . 13 (2022) . |
| APA | Sun, Zhijie , Yang, Xuanyu , Lu, Shuai , Chen, Yang , Li, Pengfei . Influence of a Landslide on a Tunnel in Loess-Bedrock Ground . | APPLIED SCIENCES-BASEL , 2022 , 12 (13) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
砂土地层盾构隧道施工过程中,合理的支护力对于开挖面的稳定性至关重要。其计算方法在深埋与浅埋工况下是有明显差异的,但是目前的研究未给出深、浅埋的明确界定。借助已有刚性截锥体破坏模式,将土压力理论的一般性与极限分析法的严格性结合,提出了适用于深、浅埋不同工况的计算方法。最后,利用理论解析法与数值模拟方法对山西中部引黄工程某标段区间盾构隧道段进行开挖面稳定性分析,理论解析法与数值模拟所得极限支护力相互印证,但理论解析法计算更为便捷,为砂土地层盾构隧道的工程实践提供借鉴与指导。
关键词 ：
开挖面稳定性 开挖面稳定性 极限分析 极限分析 砂土地层 砂土地层 盾构隧道 盾构隧道 数值模拟 数值模拟
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 王林 , 万涛 , 狄启光 et al. 砂土地层盾构隧道开挖面成拱临界深度分析 [J]. | 科学技术与工程 , 2021 , 21 (30) : 13078-13085 . |
| MLA | 王林 et al. "砂土地层盾构隧道开挖面成拱临界深度分析" . | 科学技术与工程 21 . 30 (2021) : 13078-13085 . |
| APA | 王林 , 万涛 , 狄启光 , 李鹏飞 , 徐铁强 . 砂土地层盾构隧道开挖面成拱临界深度分析 . | 科学技术与工程 , 2021 , 21 (30) , 13078-13085 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
依托北京某拟建住宅项目,采用现场监测方法获得地铁列车运行引起建筑物场区内地面振动的振动特性,并通过有限元分析软件建立地铁-土体-建筑一体化三维数值模型,预测拟建楼房的振动规律,预测结果与现场监测结果对比显示二者有良好的一致性,并分析采取基坑围护桩作为减振措施的应用效果.研究结果表明:(1)在地铁运行影响下,地面振动加速度级随着频率增加呈现先增大后减小的趋势;(2)对于10层左右的建筑物,地铁运行振动引起的动力响应随着楼层的增加,存在一个先减小后增大的过程,地面首层和顶层的动力响应最为显著;(3)基坑围护桩能有效减小建筑振动响应,各典型楼层最大Z计权振动加速度级均下降7～9 dB;(4)随着楼层的升高,建筑结构对30～40 Hz频段的建筑物竖向振动具有一定削弱作用.
关键词 ：
地铁 地铁 数值模拟 数值模拟 振动测试 振动测试 围护桩减振 围护桩减振 建筑物 建筑物
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 李鹏飞 , 卢帅 , 狄启光 et al. 地铁振动对邻近建筑物影响及围护桩减振效果研究 [J]. | 铁道勘察 , 2021 , 47 (2) : 1-6 . |
| MLA | 李鹏飞 et al. "地铁振动对邻近建筑物影响及围护桩减振效果研究" . | 铁道勘察 47 . 2 (2021) : 1-6 . |
| APA | 李鹏飞 , 卢帅 , 狄启光 , 刘建友 . 地铁振动对邻近建筑物影响及围护桩减振效果研究 . | 铁道勘察 , 2021 , 47 (2) , 1-6 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
锚杆受拉拔荷载渐进失效全过程与影响因素
关键词 ：
锚杆-灌浆界面失效 锚杆-灌浆界面失效 四线性黏结滑移模型 四线性黏结滑移模型 应力分布规律 应力分布规律 剪胀效应 剪胀效应 锚杆 锚杆 渐进失效 渐进失效
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 李鹏飞 , 黄靖络 , 王帆 et al. 锚杆受拉拔荷载渐进失效全过程与影响因素 [J]. | 李鹏飞 , 2021 , 47 (4) : 346-356 . |
| MLA | 李鹏飞 et al. "锚杆受拉拔荷载渐进失效全过程与影响因素" . | 李鹏飞 47 . 4 (2021) : 346-356 . |
| APA | 李鹏飞 , 黄靖络 , 王帆 , 北京工业大学学报 . 锚杆受拉拔荷载渐进失效全过程与影响因素 . | 李鹏飞 , 2021 , 47 (4) , 346-356 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
传统隧道防排水系统中,防水板极易因施工控制不当出现破裂,而防水板破裂后,地下水进入防水板与二衬间的空隙中,由于防水板与二衬间缺乏排水通道,地下水将沿衬砌裂缝、施工缝等薄弱环节渗出而形成隧道渗漏水病害。在传统隧道防排水系统中,渗漏水病害治理难度大,维修费用高,针对传统防排水系统存在的不足,提出了一种在隧道防水板与二衬间增设排水板的复合式防排水系统,该系统具有可调节、抗淤堵、易维护等优点。为验证该系统的有效性,采用自主研制的试验装置对复合式防排水系统中所采用的3种土工排水材料(毛细型排水板、凸壳型排水板、土工布)在不同水压及支护压力条件下的排水能力及抗淤堵能力进行了相关试验,并依托某在建隧道工程对...
关键词 ：
排水能力 排水能力 隧道工程 隧道工程 复合式防排水系统 复合式防排水系统 抗淤堵能力 抗淤堵能力 试验研究 试验研究
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 张素磊 , 鲍彤 , YOO Chungsik et al. 隧道复合式防排水系统的设计、试验及工程应用 [J]. | 中国公路学报 , 2021 , 34 (04) : 198-208 . |
| MLA | 张素磊 et al. "隧道复合式防排水系统的设计、试验及工程应用" . | 中国公路学报 34 . 04 (2021) : 198-208 . |
| APA | 张素磊 , 鲍彤 , YOO Chungsik , 刘昌 , 李鹏飞 , 陈立平 . 隧道复合式防排水系统的设计、试验及工程应用 . | 中国公路学报 , 2021 , 34 (04) , 198-208 . |
| 导入链接 | NoteExpress RIS BibTex |
导出
| 数据： |
选中 到 |
| 格式： |
