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学者姓名：曹洋兵
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Abstract ：
The existence of kaolinite inside the granite joints reduces the direct contact between the jointed rock walls, which is an unfavorable factor for the stability of underground engineering. However, there are limited studies addressing kaolinite-filled granite joints of different filling degrees (the ratio of filling thickness t to the maximum fluctuation height a of the joint surface (t/a)) even to this day, and the shear failure mechanisms of kaolinite-filled joints remain unclear. Direct shear tests of kaolinite-filled joints with different filling degrees are carried out in this study, and the acoustic emission (AE) activities during the shearing are real-timely monitored. The results show that the filling degree has a significant influence on the shear properties and AE characteristics of kaolinite-filled joints. With the increase of the filling degree, the shear stress drop is less significant, and the normal deformation gradually transitions from "first shear contraction and then shear dilation" to "shear contraction", which is accompanied by the weakening of AE signals. The increase in filling degree allows a transition of the joint behavior from the asperity-dominated damage mode to the kaolinite-dominated shear sliding mode. Moreover, the filling degree is correlated with the joint roughness coefficient (JRC) in the form of an exponential function to modify Barton's shear strength criterion. The present study gets insights into the shear failure mechanisms of kaolinite-filled joints with various filling degrees and helps interpret the field observations.
Keyword ：
Acoustic emission Acoustic emission Direct shear test Direct shear test Filling degree Filling degree Joint shear Joint shear Kaolinite-filled joints Kaolinite-filled joints
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| GB/T 7714 | Cao, Yangbing , Zhang, Yaoyao , Liu, Zhi et al. An Experimental Study of the Effects of Filling Degree on Shear Behavior and Acoustic Emission Characteristics of Kaolinite-Filled Granite Joints [J]. | KSCE JOURNAL OF CIVIL ENGINEERING , 2024 , 28 (7) : 2966-2981 . |
| MLA | Cao, Yangbing et al. "An Experimental Study of the Effects of Filling Degree on Shear Behavior and Acoustic Emission Characteristics of Kaolinite-Filled Granite Joints" . | KSCE JOURNAL OF CIVIL ENGINEERING 28 . 7 (2024) : 2966-2981 . |
| APA | Cao, Yangbing , Zhang, Yaoyao , Liu, Zhi , Bao, Min . An Experimental Study of the Effects of Filling Degree on Shear Behavior and Acoustic Emission Characteristics of Kaolinite-Filled Granite Joints . | KSCE JOURNAL OF CIVIL ENGINEERING , 2024 , 28 (7) , 2966-2981 . |
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Shale is a common rock type that is associated with underground engineering projects, and several important factors, such as bedding structure, confining pressure, and the loading and unloading path, significantly influence the anisotropy of shale. Triaxial monotonic loading tests and triaxial incremental cyclic loading and unloading tests of shale under three kinds of confining pressures and five types of bedding inclination angles (theta) were thus performed to investigate the anisotropy of shale in terms of mechanical behavior, acoustic emission (AE), and energy evolution, and reveal the mechanism by which shale anisotropy is weakened. The results show that (1) the compressive strength and elastic modulus of shale decrease and then increase as the theta increases, and that both sigma 3 and incremental cyclic loading and unloading reduce the anisotropy in terms of the compressive strength and elastic modulus of shale, with the ratio of plastic strain to total strain reaching its maximum at a theta of 60 degrees during each loading and unloading cycle. (2) The failure modes of shale with theta of 0 degrees, 30 degrees, and 90 degrees under triaxial monotonic loading are similar to the counterparts under triaxial incremental cyclic loading and unloading, while the failure modes of shale with theta of 45 degrees and 60 degrees differ significantly under the two loading conditions, and interestingly, the degree to which the bedding plane participates in shale crack evolution under incremental cyclic loading and unloading is considerably lower than that under triaxial monotonic loading. (3) The cumulative AE count and AE b-value of shale first decrease and then increase as the theta increases, while the Felicity ratio decreases as the number of cycles increases. (4) As the theta increases, the total energy density U0 and the parameter m, which reflects the accumulation rate of elastic energy, first decrease and then increase, with both reaching a minimum at a theta of 60 degrees. (5) The mode by which cyclic loading and unloading leads to failure in shale with a theta of 60 degrees is similar to that at a theta of 0 degrees and is the main mechanism by which shale anisotropy weakening occurs as a result of cyclic loading and unloading. The results provide experimental support and a theoretical basis for safer and more efficient underground engineering projects that involve shale.
Keyword ：
acoustic emission acoustic emission anisotropy anisotropy energy evolution energy evolution failure mode failure mode incremental cyclic loading and unloading incremental cyclic loading and unloading shale shale
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| GB/T 7714 | Cao, Yangbing , Yan, Qiang , Zhang, Sui et al. Experimental Research on Anisotropy Characteristics of Shale under Triaxial Incremental Cyclic Loading and Unloading [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (6) . |
| MLA | Cao, Yangbing et al. "Experimental Research on Anisotropy Characteristics of Shale under Triaxial Incremental Cyclic Loading and Unloading" . | APPLIED SCIENCES-BASEL 14 . 6 (2024) . |
| APA | Cao, Yangbing , Yan, Qiang , Zhang, Sui , Cai, Fuming . Experimental Research on Anisotropy Characteristics of Shale under Triaxial Incremental Cyclic Loading and Unloading . | APPLIED SCIENCES-BASEL , 2024 , 14 (6) . |
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This erratum is published to notify a correction in Eq. (6). © Korean Society of Civil Engineers 2024.
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| GB/T 7714 | Cao, Y. , Zhang, Y. , Liu, Z. et al. Erratum to: An Experimental Study of the Effects of Filling Degree on Shear Behavior and Acoustic Emission Characteristics of Kaolinite-Filled Granite Joints (KSCE Journal of Civil Engineering, (2024), 28, 7, (2966-2981), 10.1007/s12205-024-1085-5) [未知]. |
| MLA | Cao, Y. et al. "Erratum to: An Experimental Study of the Effects of Filling Degree on Shear Behavior and Acoustic Emission Characteristics of Kaolinite-Filled Granite Joints (KSCE Journal of Civil Engineering, (2024), 28, 7, (2966-2981), 10.1007/s12205-024-1085-5)" [未知]. |
| APA | Cao, Y. , Zhang, Y. , Liu, Z. , Bao, M. . Erratum to: An Experimental Study of the Effects of Filling Degree on Shear Behavior and Acoustic Emission Characteristics of Kaolinite-Filled Granite Joints (KSCE Journal of Civil Engineering, (2024), 28, 7, (2966-2981), 10.1007/s12205-024-1085-5) [未知]. |
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Abstract ：
基于地下水封洞库工程特征与典型洞库工程实例，整理分析大量洞室围岩内部变形、表层变形、波速与锚杆应力等监测数据.结果表明：预埋的多点位移计测点位移主要为0.5～3.0 mm,收敛位移监测值主要为4～8 mm,拱顶沉降监测值主要为3～6 mm,围岩时效变形不明显；围岩变形与爆破开挖有关，当掌子面或后续台阶开挖面接近监测断面时，变形出现陡增；围岩质量越差，开挖面空间效应越不明显.提出洞室围岩损失位移确定方法，发现损失位移占最终收敛位移50%～60%;基于波速变化率提出围岩松弛程度评价指标，发现围岩最大松弛程度约为0.47,松弛深度为1.5 m;洞室围岩锚杆受力普遍较小，锚杆拉应力与围岩变形基本同步变化.
Keyword ：
围岩变形 围岩变形 围岩松弛 围岩松弛 损失位移 损失位移 施工期监测 施工期监测 水封洞库 水封洞库
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| GB/T 7714 | 曹洋兵 , 江志豪 , 黄月 et al. 地下水封洞库施工期洞室围岩变形松弛典型特征与规律 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (02) : 245-252 . |
| MLA | 曹洋兵 et al. "地下水封洞库施工期洞室围岩变形松弛典型特征与规律" . | 福州大学学报(自然科学版) 52 . 02 (2024) : 245-252 . |
| APA | 曹洋兵 , 江志豪 , 黄月 , 李尧 , 王东瑞 , 李兵磊 . 地下水封洞库施工期洞室围岩变形松弛典型特征与规律 . | 福州大学学报(自然科学版) , 2024 , 52 (02) , 245-252 . |
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假定岩体随机结构面形状为薄圆盘,为能科学合理估算其平均直径,基于半迹长测线法,在未对分布形式作任何假设的条件下,通过理论推导获得与测线交切半迹长和岩体随机结构面直径之间的普适关系式.为便于工程应用,假设岩体随机结构面直径服从负指数分布,推导出其平均直径和与测线交切平均半迹长的关系式,基于该式提出一种岩体随机结构面平均直径的估算方法.采用岩体随机结构面三维网络模拟技术对此方法进行应用检验,结果表明,该方法具有较高的准确性与较强的工程适用性.
Keyword ：
三维网络模拟 三维网络模拟 半迹长 半迹长 岩体 岩体 平均直径 平均直径 测线法 测线法 随机结构面 随机结构面
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| GB/T 7714 | 曹洋兵 , 谢浩 , 张遂 et al. 基于与测线交切半迹长的岩体随机结构面平均直径估算 [J]. | 福州大学学报（自然科学版） , 2023 , 51 (1) : 133-139 . |
| MLA | 曹洋兵 et al. "基于与测线交切半迹长的岩体随机结构面平均直径估算" . | 福州大学学报（自然科学版） 51 . 1 (2023) : 133-139 . |
| APA | 曹洋兵 , 谢浩 , 张遂 , 黄真萍 , 邱冬冬 , 关慰清 . 基于与测线交切半迹长的岩体随机结构面平均直径估算 . | 福州大学学报（自然科学版） , 2023 , 51 (1) , 133-139 . |
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对不同龄期、不同钢纤维掺量的钢纤维/混凝土(SFRC)单轴压缩过程中声发射(AE)和微震(MS)信号进行分析，探究SFRC的声震信号特征及裂纹扩展规律。结果表明：(1) SFRC加载过程中裂纹扩展可分为裂纹压密(I)、裂纹稳定发育(II)、裂纹急速扩展(III)和峰后破坏(IV) 4个阶段；(2)随龄期增加，第I、第II阶段中AE、MS的能率、振率及微观裂纹和细、宏观裂纹的整体扩展速率均逐渐降低；第III、第IV阶段中AE、MS的能率、振率及微观裂纹及细、宏观裂纹的整体扩展速率均逐渐增大；(3)随钢纤维掺量增加，除第I阶段外，其余3个阶段的AE能率和振率、微观裂纹整体扩展速率均逐渐增大；各个阶段的MS能率和振率逐渐减小，MS能量突增点的时间比逐渐增大，表明细、宏观裂纹整体扩展速率降低，破坏时间延迟；(4) SFRC失稳前，AE、MS的能率和振率、MS能量占比均出现明显陡增，可作为SFRC的失稳前兆指标。
Keyword ：
声发射 声发射 失稳前兆 失稳前兆 微震 微震 裂纹扩展 裂纹扩展 钢纤维/混凝土 钢纤维/混凝土
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| GB/T 7714 | 刘成禹 , 陈成海 , 张向向 et al. 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]. | 复合材料学报 , 2023 , 40 (04) : 2240-2250 . |
| MLA | 刘成禹 et al. "基于声震监测的钢纤维/混凝土裂纹扩展规律及失稳前兆" . | 复合材料学报 40 . 04 (2023) : 2240-2250 . |
| APA | 刘成禹 , 陈成海 , 张向向 , 曹洋兵 , 何锡阳 . 基于声震监测的钢纤维/混凝土裂纹扩展规律及失稳前兆 . | 复合材料学报 , 2023 , 40 (04) , 2240-2250 . |
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Carbonaceous shale is the common carrier of underground engineering, and its strength assessment and failure behavior prediction are essential for the analysis of engineering stability. Carbonaceous shale naturally contains defects in different forms such as bedding plane and fissures, acting as the potential sources for the crack development and failure. To investigate the shale behaviors in underground engineering, true triaxial compression experiments are performed on transversely isotropic shale samples containing twin fissures, and the mechanical properties and failure characteristics are the main concern. Results show that the strength difference of shales with the same bedding angle under different s(3) directions, respectively, reaches 33.34 MPa and 9.63 MPa, and the strength difference with the same s(3) direction under different bedding angles attains 43.8 MPa and 20.09 MPa. A new mechanism of the "effect of s(1)-defect-coupling-induced fracture" is proposed to interpret the s(1)-dominated crack damage, the fissure-dominated crack damage, and bedding plane effect. For the shale, the shear mechanism is dominated during the initial loading stage, while the tensile mechanism is progressively enhanced as the loading proceeds toward the failure. Moreover, nine crack types and five crack coalescence modes are found in current true triaxial experiments. This study provides the experimental basis for the evaluation of the shale behaviors in response to a truly three-dimensional stress circumstance.
Keyword ：
Bedding plane Bedding plane Carbonaceous shale Carbonaceous shale Crack coalescence Crack coalescence Effect of sigma(1)-defect-coupling-induced fracture Effect of sigma(1)-defect-coupling-induced fracture True triaxial compression True triaxial compression
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| GB/T 7714 | Li, Binglei , Gong, Jinrui , Long, Yi et al. Experimental investigations on mechanical and failure behaviors of transversely isotropic shale containing twin fissures under true triaxial stresses [J]. | ARCHIVE OF APPLIED MECHANICS , 2023 , 93 (8) : 3205-3228 . |
| MLA | Li, Binglei et al. "Experimental investigations on mechanical and failure behaviors of transversely isotropic shale containing twin fissures under true triaxial stresses" . | ARCHIVE OF APPLIED MECHANICS 93 . 8 (2023) : 3205-3228 . |
| APA | Li, Binglei , Gong, Jinrui , Long, Yi , Hu, Hongyuan , Cao, Yang-Bing . Experimental investigations on mechanical and failure behaviors of transversely isotropic shale containing twin fissures under true triaxial stresses . | ARCHIVE OF APPLIED MECHANICS , 2023 , 93 (8) , 3205-3228 . |
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Due to the extreme water sensitivity of shale, the excavation of shale underground engineering is prone to major disaster accidents such as roof falls and collapses. However, current investigations have failed to fully explain the mechanisms by which water content affects shale damage behaviors. In this study, the acousto-mechanical properties and failure behaviors of laminated shale under different confining pressures s(3) are investigated with the aid of AE monitoring for three different water content states. The results show that the shale strength decreases with the increase of the water content, but it increases as the confining pressure s(3) increases. For the shale, the change in the wetting angle and the distance between the centroids of the two adjacent particles inside the bedding plane is more prominent than the surrounding shale matrix, and the swelling pressure is generated among the clay minerals, which are the two main mechanisms for the bedding-participating failure and the shale softening after immersion. Moreover, with the increase of the water content and s(3), the damage mode of shale specimens gradually changes from tension damage to shear damage. Controlled by bedding, shale failure shows significant suddenness without clear acoustical precursors. This study provides experimental and theoretical bases for the stability analysis of shale underground engineering.
Keyword ：
acoustic emission acoustic emission failure characteristics failure characteristics shale shale triaxial compression experiment triaxial compression experiment water content water content
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| GB/T 7714 | Zhang, Sui , Cai, Fuming , Cao, Yangbing et al. Influences of Water Content on Acousto-Mechanical Properties and Failure Behaviors of Triaxially Compressed Shale [J]. | MINERALS , 2023 , 13 (8) . |
| MLA | Zhang, Sui et al. "Influences of Water Content on Acousto-Mechanical Properties and Failure Behaviors of Triaxially Compressed Shale" . | MINERALS 13 . 8 (2023) . |
| APA | Zhang, Sui , Cai, Fuming , Cao, Yangbing , Yan, Qiang . Influences of Water Content on Acousto-Mechanical Properties and Failure Behaviors of Triaxially Compressed Shale . | MINERALS , 2023 , 13 (8) . |
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揭示裂隙岩体纵波速度变化规律对工程岩体质量分级与稳定性评价具有重要意义.以某地下水封洞库无充填型单裂隙花岗岩为研究对象,基于钻孔电视成像、水压致裂法地应力测试与声波全波列测井,获取了 384组单裂隙花岗岩的几何特性、受力状态与纵波速度,构建起了预测单裂隙花岗岩纵波速度的进化-神经网络模型,分析了关键指标影响下单裂隙花岗岩纵波速度的变化规律.研究表明:该水封洞库单裂隙花岗岩纵波速度分布于4 300～5 330 m/s之间,82.3％的纵波速度在4 700～5 200 m/s之间;选取裂隙法向应力、平均张开度与倾角作为单裂隙花岗岩纵波速度的预测指标是合理可行的;将现场测试数据分为训练样本与测试样本,基于遗传算法优化神经网络权值、阈值的进化-神经网络模型构建出单裂隙花岗岩纵波速度预测模型,其测试误差最大仅为2.9％,85％的样本测试误差不超过1.5％,预测模型精度较高.分析了纵波速度变化规律,发现单裂隙花岗岩纵波速度随裂隙法向应力增大而增大,但当法向应力增至5 MPa后的纵波速度增大速率逐渐减小,纵波速度随裂隙张开度增大而逐渐减小,纵波速度在裂隙倾角小于40°时无明显变化,此后纵波速度随倾角增大而增大.
Keyword ：
单裂隙花岗岩 单裂隙花岗岩 声波测试 声波测试 水封洞库 水封洞库 神经网络模型 神经网络模型 纵波速度 纵波速度
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| GB/T 7714 | 曹洋兵 , 吴阳 , 张朋 et al. 地下水封洞库单裂隙花岗岩纵波速度变化规律与预测模型 [J]. | 地质科技通报 , 2023 , 42 (6) : 12-20 . |
| MLA | 曹洋兵 et al. "地下水封洞库单裂隙花岗岩纵波速度变化规律与预测模型" . | 地质科技通报 42 . 6 (2023) : 12-20 . |
| APA | 曹洋兵 , 吴阳 , 张朋 , 江志豪 , 张思怡 , 黄真萍 . 地下水封洞库单裂隙花岗岩纵波速度变化规律与预测模型 . | 地质科技通报 , 2023 , 42 (6) , 12-20 . |
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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
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| 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 . |
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