Query：
学者姓名：刘成禹
Refining：
Year
Type
Indexed by
Source
Complex
Former Name
Co-
Language
Clean All
Abstract ：
Liquid nitrogen (LN2) fracturing has been proposed to be used in unconventional gas engineering, including shale reservoirs. However, the effect of LN2 cooling on the fracture behaviors of bedding shale has not been well studied. In this study, three-point bending tests were conducted on shale samples at room temperature and under LN2 cooling condition, respectively. Different bedding angles were considered in these tests. The phenomenon of acoustic emission was monitored during the fracture initiation and propagation of bedding shale. The results showed that the tensile strength, fracture toughness, bending elastic modulus and fracture energy decreased with the increase of bedding angle under the same temperature condition, but the bedding angle has no significant effect on energy storage ratio and speed. There was a linear relationship between the tensile strength and fracture toughness of bedding shale. The crack initiation was inconsistent with the loading reference line except in 90 degrees bedding shale, and then turned to the direction parallel to the loading reference line, resulting in various fracture morphology of bedding shale. The acoustic emission signals were mainly concentrated in the failure stage because of the severe brittleness of bedding shale. Under LN2 cooling condition, the tensile strength, fracture toughness, bending elastic modulus, energy storage ratio, fracture energy and AE cumulative ringing counts of bedding shale with the same bedding angle significantly increased, but the energy storage speed decreased. The crack length along bedding direction was longer and the crack inflection point was clearer than those of bedding shale at room temperature.
Keyword ：
Anisotropy Anisotropy Bedding shale Bedding shale Fracture behaviors Fracture behaviors Fracture toughness Fracture toughness Liquid-nitrogen Liquid-nitrogen Tensile strength Tensile strength Three-point bending test Three-point bending test
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Zhang, Xiangxiang , Wu, Shaoyan , Liu, Chengyu et al. An experimental investigation into the effect of liquid nitrogen cooling on fracture behaviors of bedding shale [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2025 , 136 . |
| MLA | Zhang, Xiangxiang et al. "An experimental investigation into the effect of liquid nitrogen cooling on fracture behaviors of bedding shale" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 136 (2025) . |
| APA | Zhang, Xiangxiang , Wu, Shaoyan , Liu, Chengyu , Su, Shanjie . An experimental investigation into the effect of liquid nitrogen cooling on fracture behaviors of bedding shale . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2025 , 136 . |
| 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 ：
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 ：
This study focuses on the calcareous cemented conglomerate on the side wall of the Zhoukoudian Ape Man Cave site in Beijing. We analyzed the change patterns of cracks in grotto rock under natural conditions using statistical analysis of continuous monitoring data from 12 rock fracture measurement points for 7 years and environmental monitoring data. The results indicated that: (1) Under natural conditions, rock fracture width exhibited seasonal and periodic variations, which can be predicted using autoregressive integrated moving average (ARIMA) model. The ARIMA (2, 1, 1) model has the highest fitting accuracy. (2) The width of rock fractures showed a negative correlation with ambient temperature and relative humidity, with a stronger correlation with temperature. Changes in fracture width lagged behind changes in temperature and relative humidity, with a higher lag correlation and shorter lag time for temperature compared to relative humidity. (3) The degree of correlation and lag correlation between rock fracture width and ambient temperature followed the trend of room-temperature > high-temperature > low-temperature > extremely-low-temperature. The lag time followed the trend of extremely-low-temperature > low-temperature>high-temperature. Additionally, more stable relative humidity of the surroundings indicated a higher correlation. (4) At a constant, the width of rock fractures increased gradually over time, following an approximate exponential growth or asymptotic distribution. (5) At the same temperature, more stable relative humidity corresponded to a slower increase in rock fracture width over time. Under natural conditions, lower ambient temperatures led to a rapid increase in rock fracture width over time. These findings enhance our understanding of the expansion patterns of cracks in grotto rock under natural conditions. Moreover, they provide a reference framework for predicting crack changes in the preventive conservation of ancient rock sites, caves, and stone carvings in temperate monsoon climate regions. © 2024 Biodiversity Research Center Academia Sinica. All rights reserved.
Keyword ：
Ape Man Cave Ape Man Cave correlation correlation relative humidity relative humidity rock cracks rock cracks temperature temperature
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Liu, C.-Y. , Xu, Z.-Y. , Wu, C.-Y. et al. Changes in width of cracks in grotto rock under natural conditions; [自然条件下石窟岩石裂缝宽度的变化规律] [J]. | Rock and Soil Mechanics , 2024 , 45 (10) : 3105-3116 . |
| MLA | Liu, C.-Y. et al. "Changes in width of cracks in grotto rock under natural conditions; [自然条件下石窟岩石裂缝宽度的变化规律]" . | Rock and Soil Mechanics 45 . 10 (2024) : 3105-3116 . |
| APA | Liu, C.-Y. , Xu, Z.-Y. , Wu, C.-Y. , Zhang, X.-X. , Zheng, J. . Changes in width of cracks in grotto rock under natural conditions; [自然条件下石窟岩石裂缝宽度的变化规律] . | Rock and Soil Mechanics , 2024 , 45 (10) , 3105-3116 . |
| 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 insitu stress conditions is evidently essential for the safe excavation.
Keyword ：
Biaxial compression tests Biaxial compression tests Crack propagation Crack propagation Hard rock excavation Hard rock excavation Rockburst Rockburst Slit-cut method Slit-cut method
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 ：
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 ：
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 ：
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 ：
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 ：
Export
| Results： |
Selected to |
| Format： |
