Query：
学者姓名：刘成禹
Refining：
Year
Type
Indexed by
Source
Complex
Co-
Language
Clean All
Abstract ：
针对乐山大佛九曲栈道地形崎岖多变、长年游人如织的特点,为分析行人荷载对九曲栈道赋存岩体稳定性的影响,建立了九曲栈道区域的精细化模型,采用数值计算方法研究了行人静、动荷载作用下九曲栈道赋存岩体的受力状态及变形特征.结果表明,九曲栈道满载行人时赋存岩体整体稳定,仅局部表层岩体发生破坏.静荷载下L1裂隙底部、L15中下部及栈道底部佛龛的表层岩体受拉破坏;栈道中下部两转角处崖壁、佛脚平台及临江面底部凸出部位的表层岩体易发展为受拉破坏.动荷载下栈道赋存岩体的振动速度均超过规范容许值,在行人动荷载长期作用下易疲劳破坏;栈道上部转角处凸出部位的表层岩体还可能发生瞬时受拉破坏.研究结果对掌握行人荷载下九曲栈道赋存岩体的稳定性现状及预防性加固有指导意义.
Keyword ：
九曲栈道 九曲栈道 数值计算 数值计算 稳定性 稳定性 精细化建模 精细化建模 行人荷载 行人荷载
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | 鲍方伟 , 刘成禹 , 麻润杰 et al. 行人荷载下乐山大佛九曲栈道赋存岩体稳定性研究 [J]. | 重庆大学学报 , 2024 , 47 (10) : 149-161 . |
| MLA | 鲍方伟 et al. "行人荷载下乐山大佛九曲栈道赋存岩体稳定性研究" . | 重庆大学学报 47 . 10 (2024) : 149-161 . |
| APA | 鲍方伟 , 刘成禹 , 麻润杰 , 谢永宁 , 吴昌宇 . 行人荷载下乐山大佛九曲栈道赋存岩体稳定性研究 . | 重庆大学学报 , 2024 , 47 (10) , 149-161 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
川渝地区石窟主要开凿在砂泥岩交替出露的山体崖壁上,崖壁上部自然岩体窟檐对下部造像区具有一定的保护作用.为分析窟檐在自然环境下的稳定性情况,在对川渝地区石窟地层特点、窟檐岩体结构、窟檐尺寸范围及力学参数等调查基础上,利用FLAC3D对窟檐稳定性进行计算分析后发现,依据窟檐结构特点的差异、卸荷裂隙是否存在以及发育位置的不同,川渝地区石窟窟檐主要有3种破坏模式:悬臂拉断破坏、倾倒破坏、软弱基座压溃破坏.进一步分析得到每种破坏模式的破坏特点、影响窟檐稳定性的主要因素及影响规律.最后,给出窟檐稳定性评价参考表,可为川渝地区石窟窟檐现场勘察和稳定性评价提供参考.
Keyword ：
川渝石窟 川渝石窟 数值分析 数值分析 稳定性 稳定性 窟檐 窟檐
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | 冯新 , 刘成禹 , 吴昌宇 et al. 川渝地区石窟窟檐的稳定性研究 [J]. | 重庆大学学报 , 2024 , 47 (10) : 138-148 . |
| MLA | 冯新 et al. "川渝地区石窟窟檐的稳定性研究" . | 重庆大学学报 47 . 10 (2024) : 138-148 . |
| APA | 冯新 , 刘成禹 , 吴昌宇 , 麻润杰 . 川渝地区石窟窟檐的稳定性研究 . | 重庆大学学报 , 2024 , 47 (10) , 138-148 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
The grottoes in the Sichuan and Chongqing area are mainly carved into cliff walls where alternating layers of sandstone and mudstone are exposed. The natural rock eaves in the upper part of the cliffs provide protection for the sculptures in the lower part. To assess the stability of these eaves under natural conditions, this study investigates the stratigraphic characteristics, rock mass structure, dimensions and mechanical parameters of the eaves. With using FLAC3D for calculation and analysis, three main failure modes are identified: cantilever tensile failure, toppling failure and soft foundation crushing failure. The study also identifies the damage characteristics, key factors affecting eaves stability and their effects. A stability evaluation reference table is provided for field investigations and stability evaluation of grottoes eaves in the Sichuan and Chongqing area. © 2024 Chongqing University. All rights reserved.
Keyword ：
eaves eaves numerical analysis numerical analysis Sichuan and Chongqing grottoes Sichuan and Chongqing grottoes stability stability
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Feng, X. , Liu, C. , Wu, C. et al. Stability of grotto eaves in the Sichuan and Chongqing area; [川 渝 地 区 石 窟 窟 檐 的 稳 定 性 研 究] [J]. | Journal of Chongqing University , 2024 , 47 (10) : 138-148 . |
| MLA | Feng, X. et al. "Stability of grotto eaves in the Sichuan and Chongqing area; [川 渝 地 区 石 窟 窟 檐 的 稳 定 性 研 究]" . | Journal of Chongqing University 47 . 10 (2024) : 138-148 . |
| APA | Feng, X. , Liu, C. , Wu, C. , Ma, R. . Stability of grotto eaves in the Sichuan and Chongqing area; [川 渝 地 区 石 窟 窟 檐 的 稳 定 性 研 究] . | Journal of Chongqing University , 2024 , 47 (10) , 138-148 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
The rugged terrain of Jiuqu Plank Road experiences heavy tourist traffic year-round. To assess the impact of tourist loads on rock mass stability, a refined model was established, using numerical simulations to analyze stress and deformation under static and dynamic loads. The results indicate that when the Jiuqu Plank Road is fully loaded with pedestrians, the rock mass is generally stable, with only partial damage to the surface rock mass. Under static load, the surface rock mass of L1 crack bottom, L15 middle and lower parts, and the Buddha niche at the bottom of the plank road are subjected to tensile failure, and the surface rock mass at the two corners of the middle and lower parts of the plank road, the Buddha foot platform, and the protruding part facing the river are prone to tensile failure. The vibration velocities of the rock mass in the boardwalk under dynamic load all exceed the specification allowable value, and it is prone to fatigue failure under long-term pedestrian dynamic load. The surface rock mass at the protruding corner of the upper part of the plank road may experience instantaneous tensile failure. These findings are essential for monitoring stability and guiding preventive reinforcement efforts. © 2024 Chongqing University. All rights reserved.
Keyword ：
Jiuqu Plank Road Jiuqu Plank Road numerical calculation numerical calculation refined modeling refined modeling stability stability tourist load tourist load
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Bao, F. , Liu, C. , Ma, R. et al. Stability analysis of the occurrence rock mass in Jiuqu Plank Road of Leshan Giant Buddha under tourist load; [行 人 荷 载 下 乐 山 大 佛 九 曲 栈 道 赋 存 岩 体 稳 定 性 研 究] [J]. | Journal of Chongqing University , 2024 , 47 (10) : 149-161 . |
| MLA | Bao, F. et al. "Stability analysis of the occurrence rock mass in Jiuqu Plank Road of Leshan Giant Buddha under tourist load; [行 人 荷 载 下 乐 山 大 佛 九 曲 栈 道 赋 存 岩 体 稳 定 性 研 究]" . | Journal of Chongqing University 47 . 10 (2024) : 149-161 . |
| APA | Bao, F. , Liu, C. , Ma, R. , Xie, Y. , Wu, C. . Stability analysis of the occurrence rock mass in Jiuqu Plank Road of Leshan Giant Buddha under tourist load; [行 人 荷 载 下 乐 山 大 佛 九 曲 栈 道 赋 存 岩 体 稳 定 性 研 究] . | Journal of Chongqing University , 2024 , 47 (10) , 149-161 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
In South China, due to climatic factors, highly weathered granite is distributed across a large area and easily disintegrates after encountering water, causing many geological disasters and other problems. To determine the disintegration mechanism of highly weathered granite in South China, disintegration tests were carried out on highly weathered granite in the Fuzhou area under different immersion durations, cycle times, and flow rates, with the help of a self-designed disintegration test device. Moreover, the disintegration mechanism of the highly weathered granite was revealed using nuclear magnetic resonance (NMR) technology. The results demonstrated an increase in the cumulative relative disintegration with prolonged immersion time and the number of dry-wet cycles. Beyond a certain flow rate, the cumulative relative disintegration amount stabilized. There was a strong correlation between the steady disintegration rate and immersion time (or dry-wet cycles). The disintegration process of the highly weathered granite was divided into three stages: rapid, moderate, and stable disintegration. Notably, disintegration primarily occurred around the large pores. This study revealed that the variation in the immersion time (or wet-dry-scouring cycles) was fundamentally linked to changes in the relative volume of the large pores in the rock samples. These findings provide valuable insights for predicting and mitigating surface disasters on highly weathered granite slopes.
Keyword ：
disintegration disintegration disintegration steady flow rate disintegration steady flow rate dry-wet cycles dry-wet cycles highly weathered granite highly weathered granite immersion time immersion time
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | He, Xiyang , Liu, Chengyu , Zhang, Xiangxiang et al. Disintegration Characteristics of Highly Weathered Granite under the Influence of Scouring [J]. | WATER , 2024 , 16 (3) . |
| MLA | He, Xiyang et al. "Disintegration Characteristics of Highly Weathered Granite under the Influence of Scouring" . | WATER 16 . 3 (2024) . |
| APA | He, Xiyang , Liu, Chengyu , Zhang, Xiangxiang , Wu, Changyu , Weng, Zhiyu . Disintegration Characteristics of Highly Weathered Granite under the Influence of Scouring . | WATER , 2024 , 16 (3) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
以北京周口店猿人洞遗址侧壁上的钙质胶结砾岩为研究对象，通过12个岩石测缝计连续7年监测数据和周边环境监测数据的统计分析，得出自然条件下石窟岩石裂缝的变化规律。研究表明：（1）自然条件下，岩石裂缝宽度呈现出季节性、周期性变化规律，采用适宜于非平稳季节的ARIMA (2，1，1)模型可对裂缝宽度进行预测；（2）岩石裂缝宽度与环境温度、湿度呈负相关性关系，与环境温度的相关性明显高于湿度；岩石裂缝宽度变化滞后于环境温度和湿度的变化，与温度的滞后相关性高于湿度，与温度的滞后时间远小于与湿度的滞后时间；（3）岩石裂缝宽度与环境温度的相关性及滞后相关性程度为：常温＞高温＞低温＞极端低温；滞后时间为：极端低温＞低温＞高温；周边环境相对湿度越稳定，它们的相关性越高；（4）相同温度下，岩石裂缝宽度随时间呈缓慢增长趋势，近似呈指数增长或指数渐近式分布；（5）环境温度相同条件下，湿度越稳定，岩石裂缝宽度随时间的增长越缓慢；天然状态下，环境温度越低，岩石裂缝宽度随时间的增长越快。研究成果有助于深入了解石窟岩石裂缝在自然条件下的扩展规律，为温带季风气候地区岩石古遗址、石窟、石刻等的预防性保护提供了裂缝变化的参考依据。
Keyword ：
岩石裂缝 岩石裂缝 温度 温度 猿人洞 猿人洞 相关性 相关性 相对湿度 相对湿度
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | 刘成禹 , 许枝钰 , 吴昌宇 et al. 自然条件下石窟岩石裂缝宽度的变化规律 [J]. | 岩土力学 , 2024 , (10) . |
| MLA | 刘成禹 et al. "自然条件下石窟岩石裂缝宽度的变化规律" . | 岩土力学 10 (2024) . |
| APA | 刘成禹 , 许枝钰 , 吴昌宇 , 张向向 , 郑健 . 自然条件下石窟岩石裂缝宽度的变化规律 . | 岩土力学 , 2024 , (10) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
In this paper, uniaxial compression tests were carried out on nine concrete specimens with different coarse aggregate particle size ranges in single and continuous gradation at curing ages of 3, 7 and 28 d, respectively. The acoustic emission (AE) and microseismic (MS) signals of the whole loading process were monitored by combining AE and MS to investigate. The AE and MS signals characteristics of concrete with different coarse aggregate gradations during load damage at different curing ages were analyzedand the effect of the maximum coarse aggregate size on the damage evolution of concrete were investigated. Based on findings from experiments, as the maximum particle size of the coarse aggregate increases, the initial defects within the concrete specimens initially decrease and then increase. A larger size and the more heterogeneous of the coarse aggregate has an accelerating effect on the emergence and expansion of cracks throughout the load-induced damage process in concrete structures. In addition, when the curing age is brief, the expansion of internal cracks in concrete predominantly depends on the curing age, with the relationship to the maximum particle size of coarse aggregate being less evident. © The Author(s), under exclusive licence to Shiraz University 2024.
Keyword ：
Acoustic emission Acoustic emission Coarse aggregate gradation Coarse aggregate gradation Curing age Curing age Microseismic Microseismic
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Wu, C. , Zheng, Y. , Liu, C. . Effect of Coarse Aggregate Gradation on the Acoustic Emission and Microseismic Behavior of Concrete Under Load [J]. | Iranian Journal of Science and Technology - Transactions of Civil Engineering , 2024 . |
| MLA | Wu, C. et al. "Effect of Coarse Aggregate Gradation on the Acoustic Emission and Microseismic Behavior of Concrete Under Load" . | Iranian Journal of Science and Technology - Transactions of Civil Engineering (2024) . |
| APA | Wu, C. , Zheng, Y. , Liu, C. . Effect of Coarse Aggregate Gradation on the Acoustic Emission and Microseismic Behavior of Concrete Under Load . | Iranian Journal of Science and Technology - Transactions of Civil Engineering , 2024 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
The slit-cut method for the rockburst prevention and control is believed effective with its easiness in operation, adjustment and compatibility. However, there is limited advance knowledge of the physics of the slit-cut method, which is vital for the engineering designs. In this study, the biaxial compression tests with a synchronous AE (acoustic emission)-DIC (digital image correlation) monitoring are creatively carried out on the slit-contained circular opening specimens with different slit configurations to demonstrate the academic thoughts and mechanisms of the slit-cut method. The experiments document the two typical failure types namely the internal crack propagation and the dynamic rockburst, which occupy different AE hit rate characteristics and different entropy properties. With the occurrence of rockburst, the AE hit rate presents a bouncing ascend-descend trend, and a higher disorder and chaos is faithfully exhibited. Depending on the slit parameters, the slit-cut method can efficiently mitigate rockburst in terms of the occurrence frequency and magnitude. The underlying mechanism lies in the enhancement of the shear mechanism and the development of the internal cracks through which the stored energy can be greatly dissipated. However, due to the unrestricted shear failure in the slit-contained opening specimens, the opening-scale inward instability can be triggered by the internal crack coalescence, thus posing a threat to the safety of the opening. Implementing the slit-cut method with a consideration of the in-situ stress conditions is evidently essential for the safe excavation. © 2024 Elsevier Ltd
Keyword ：
Acoustic emission testing Acoustic emission testing Compression testing Compression testing Crack propagation Crack propagation Image compression Image compression Rock bursts Rock bursts Rock mechanics Rock mechanics Shear flow Shear flow
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Zhang, Jian-Zhi , Zhou, Yi-Jie , Liu, Cheng-Yu et al. Experimental investigations on the failure characteristics of the slit-contained circular opening under biaxial compression: Insights into the rockburst prevention [J]. | Theoretical and Applied Fracture Mechanics , 2024 , 134 . |
| MLA | Zhang, Jian-Zhi et al. "Experimental investigations on the failure characteristics of the slit-contained circular opening under biaxial compression: Insights into the rockburst prevention" . | Theoretical and Applied Fracture Mechanics 134 (2024) . |
| APA | Zhang, Jian-Zhi , Zhou, Yi-Jie , Liu, Cheng-Yu , Yu, Jin , Li, Xing-Shang , Zhang, Ting . Experimental investigations on the failure characteristics of the slit-contained circular opening under biaxial compression: Insights into the rockburst prevention . | Theoretical and Applied Fracture Mechanics , 2024 , 134 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
To study the effect of freeze-thaw temperature change rate on the crack propagation characteristics and failure precursor in freeze-thawed sandstone, uniaxial compression tests were simultaneous monitoring for acoustic emission (AE) and microseismic (MS) signals. The results demonstrate that increased temperature change rates resulted in accelerated crack propagation, earlier rock failure, and lower brittleness; the failure mode changes from tensile to shear-tensile mixing; the proportion of tensile cracks decreases from 90.9% to 70.8%; and shear cracks increase from 9.1% to 29.2%. A comparative analysis of AE and MS provided insights into the evolution of crack propagation at multiple scales, enabling the classification of crack types and their relationship with propagation scale. Based on the precursor characteristic of the original waveform and time-domain curve in AE and MS signals, the advantageous areas of early-warming indicators for rock failure were identified. Compared with traditional indicators, the precursory indicators calculated using MS b-values and AE energy rates can obtain a larger early warning window, with maximum windows of 20.52%-29.29% and 7.09%-13.73% in high initial damage rocks and low initial damage rocks, respectively. Examined temperature change rate effects on mechanics and failure modes. Investigate multi-scale crack propagation evolution during loading using AE and MS. Crack type was classified and identified through normalization and KDE methods. The advantages field of early warning indicators for rock failure were evaluated.
Keyword ：
acoustic emission acoustic emission crack classification crack classification failure precursor failure precursor freeze-thaw temperature change rate freeze-thaw temperature change rate microseismic microseismic multiple-scale crack multiple-scale crack
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Zheng, Daozhe , Liu, Chengyu , Zhou, Annan et al. Multiple-scale crack propagation characteristics and failure precursor identification of freeze-thawed sandstone during loading [J]. | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2024 , 47 (8) : 2934-2954 . |
| MLA | Zheng, Daozhe et al. "Multiple-scale crack propagation characteristics and failure precursor identification of freeze-thawed sandstone during loading" . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES 47 . 8 (2024) : 2934-2954 . |
| APA | Zheng, Daozhe , Liu, Chengyu , Zhou, Annan , Zhang, Xiangxiang , Chen, Chenghai , Huang, Shengfeng . Multiple-scale crack propagation characteristics and failure precursor identification of freeze-thawed sandstone during loading . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2024 , 47 (8) , 2934-2954 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Uniaxial compression tests were performed on the steel fiber reinforced concrete (SFRC) specimens with different ages and steel fiber volume fractions. The acoustic emission (AE) and microseismic (MS) signals were monitored during the loading progress. Through the in-depth analysis of testing results, the feature of AE and MS signals and the evolution of crack propagation in SFRC were studied. The results show that: (1) The crack propagation of SFRC during uniaxial compression can be divided into four stages: Crack compaction stage (I), crack stable development stage (II), crack unstable propagation stage (III) and post-peak failure stage (IV). Different stages show different AE and MS characteristics. (2) With the increase of age, the energy rates and count rates of AE and MS in stages I and II decrease, as well as the generation rates of micro-, meso- and macro- cracks of the whole specimen. However, the energy rate and count rate of AE and MS in stages III and IV increase, as well as the generation rates of micro-, meso- and macro-cracks of the whole specimen increase. (3) With the increase of steel fiber volume fraction, the AE energy rate, AE count rate and micro-crack generation rate of the whole specimen in stages II, III and IV increase, while the MS energy rate and MS count rate in each stage decrease, and the MS energy surge time rate in each stage increase. Furthermore, the generation rates of meso- and macro- cracks of the whole specimen in each stage decrease, and the failure time is delayed. (4) Before the failure of SFRC, the energy rates and count rates of AE and MS increase sharply, as well as MS energy ratio. These variables can be used as the precursor index of SFRC failure. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
Keyword ：
acoustic emission acoustic emission crack propagation crack propagation failure precursor failure precursor microseismic microseismic steel fiber reinforced concrete steel fiber reinforced concrete
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Liu, C. , Chen, C. , Zhang, X. et al. Crack propagation law and failure precursor of steel fiber reinforced concrete based on acoustic emission and microseism monitoring; [基于声震监测的钢纤维/混凝土裂纹扩展规律及失稳前兆] [J]. | Acta Materiae Compositae Sinica , 2023 , 40 (4) : 2240-2250 . |
| MLA | Liu, C. et al. "Crack propagation law and failure precursor of steel fiber reinforced concrete based on acoustic emission and microseism monitoring; [基于声震监测的钢纤维/混凝土裂纹扩展规律及失稳前兆]" . | Acta Materiae Compositae Sinica 40 . 4 (2023) : 2240-2250 . |
| APA | Liu, C. , Chen, C. , Zhang, X. , Cao, Y. , He, X. . Crack propagation law and failure precursor of steel fiber reinforced concrete based on acoustic emission and microseism monitoring; [基于声震监测的钢纤维/混凝土裂纹扩展规律及失稳前兆] . | Acta Materiae Compositae Sinica , 2023 , 40 (4) , 2240-2250 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Export
| Results： |
Selected to |
| Format： |
