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学者姓名：曹洋兵
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Abstract ：
页岩是黔东深部锰矿等金属矿体的重要围岩.由于矿体开采导致的复杂应力与地下水重分布条件,矿体顶板页岩失稳灾害频繁发生.研究含水率和加卸载路径影响下页岩力学及声发射特性具有重要意义.开展不同围压与含水率下页岩试样的三轴多级加卸载试验,结合声发射监测,研究了页岩力学及声发射特性,并探究了含水率对页岩强度的影响机理.结果表明:相同含水率与围压下,页岩单调加载下三轴压缩强度大于多级加卸载循环条件;在三轴多级加卸载下,页岩三轴抗压强度随含水率的增加而显著降低;随着含水率和围压的增加,页岩破坏模式由拉伸破坏主导型向剪切破坏主导型转变;含水率越高,页岩的主穿透裂缝越多,声发射b值越大,Felicity比值越低;含水率增加时,矿物溶解和液桥结合力降低等因素综合导致页岩抗压强度降低.研究结论可为黔东深部锰矿等矿体顶板页岩力学参数的确定与声发射破坏前兆的甄别提供支撑.
Keyword ：
力学特性 力学特性 含水率 含水率 声发射 声发射 多级加卸载 多级加卸载 页岩 页岩
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| GB/T 7714 | 张遂 , 严强 , 曹洋兵 et al. 含水率对三轴多级加卸载下页岩力学及声发射特性的影响 [J]. | 金属矿山 , 2025 , (2) : 33-40 . |
| MLA | 张遂 et al. "含水率对三轴多级加卸载下页岩力学及声发射特性的影响" . | 金属矿山 2 (2025) : 33-40 . |
| APA | 张遂 , 严强 , 曹洋兵 , 蔡福明 , 沈红钱 . 含水率对三轴多级加卸载下页岩力学及声发射特性的影响 . | 金属矿山 , 2025 , (2) , 33-40 . |
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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).
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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 (vol 28, pg 2966, 2024) [J]. | KSCE JOURNAL OF CIVIL ENGINEERING , 2024 , 28 (8) : 3574-3574 . |
| 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 (vol 28, pg 2966, 2024)" . | KSCE JOURNAL OF CIVIL ENGINEERING 28 . 8 (2024) : 3574-3574 . |
| 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 (vol 28, pg 2966, 2024) . | KSCE JOURNAL OF CIVIL ENGINEERING , 2024 , 28 (8) , 3574-3574 . |
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总结分析地下水封洞库工程地质特征,综合考虑工程地质勘察与监测信息等已知条件与设计目标、约束条件,提出考虑洞室断面收缩、岩体结构模型与力学参数同步反馈修正的地下水封洞库洞室智能动态设计方法.该方法在初步设计阶段,应用反映场地岩体结构等效特征的岩体离散介质模型构建技术,结合不同模型条件下岩体、结构面力学参数综合确定方法与围岩稳定性、水封性评价指标,并充分利用进化神经网络算法等智能优化方法进行洞室设计;在施工图设计与施工阶段,应用反映开挖区段岩体结构真实特征的岩体离散介质模型动态反馈修正数值模型,并基于多场监测数据开展岩体与结构面力学参数智能反演以进行洞室设计,同时提出洞室断面收缩调整策略.选取浙江某地下水封洞库作为典型案例,分别从两阶段介绍设计方法应用过程与成效,结果表明该方法具有较高可行性与可靠性.
Keyword ：
动态设计 动态设计 围岩稳定性 围岩稳定性 地下水封洞库 地下水封洞库 智能算法 智能算法 离散元模拟 离散元模拟
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| GB/T 7714 | 朱海涛 , 曹洋兵 , 谢浩 et al. 地下水封洞库洞室智能动态设计方法研究与实践 [J]. | 福州大学学报（自然科学版） , 2024 , 52 (6) : 740-747 . |
| MLA | 朱海涛 et al. "地下水封洞库洞室智能动态设计方法研究与实践" . | 福州大学学报（自然科学版） 52 . 6 (2024) : 740-747 . |
| APA | 朱海涛 , 曹洋兵 , 谢浩 , 张遂 , 黄真萍 . 地下水封洞库洞室智能动态设计方法研究与实践 . | 福州大学学报（自然科学版） , 2024 , 52 (6) , 740-747 . |
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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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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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The present study investigates the fatigue behavior of granite and red sandstone under coupled static and cyclic loading. Experimental results reveals a three-stage evolution trend for the deformation modulus, Young's modulus, peak strain, residual strain, dissipated energy as a function of the absolute cycle. Acoustic emission (AE) rate also exhibits a three-phase stage, including the initial phase, uniform velocity phase, and accelerated phase. To explain the mechanical responses and fracture mechanisms related to rock fatigue, this study built a micromechanics-based damage model that adopts a modified Paris law and considers both the effect of static stress and stress amplitude. The theoretical model successfully reflects the effect of static loading history and reproduces the three-stage evolution of residual strain during rock fatigue. The SIF deduced by the theoretical model exhibits a distinct behavior: it initially decreases during the first few cycles, stabilizes at a lower value, and subsequently undergoes a significant increase as it approaches the final cycles. The internal cause behind the three-stage evolution of crack growth rate, AE rate, and mechanical properties is attributed to subcritical crack growth during cyclic loading. Finally, the theoretical model successfully characterizes the effect of static stress and stress amplitude of cyclic loads on fatigue damage evolution.
Keyword ：
Acoustic emission Acoustic emission Damage evolution Damage evolution Fatigue damage model Fatigue damage model Stress intensity factor Stress intensity factor
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| GB/T 7714 | Miao, Shuting , Pan, Peng-Zhi , Cao, Yangbing et al. Enhancing understanding of fracture mechanisms in brittle rocks under static and cyclic loads: Experimental insights and theoretical model [J]. | ENGINEERING FRACTURE MECHANICS , 2023 , 289 . |
| MLA | Miao, Shuting et al. "Enhancing understanding of fracture mechanisms in brittle rocks under static and cyclic loads: Experimental insights and theoretical model" . | ENGINEERING FRACTURE MECHANICS 289 (2023) . |
| APA | Miao, Shuting , Pan, Peng-Zhi , Cao, Yangbing , Huo, Lei . Enhancing understanding of fracture mechanisms in brittle rocks under static and cyclic loads: Experimental insights and theoretical model . | ENGINEERING FRACTURE MECHANICS , 2023 , 289 . |
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The instability of jointed rock mass is usually the shear process of the rock mass along discontinuities under the influence of groundwater flow. By conducting laboratory tests and numerical experiments on the shear-flow coupling of rock joints under constant normal stiffness (CNS) and constant normal stress (CNL) boundary conditions, the influence of normal boundary conditions and seepage pressure on the shear mechanical and flow characteristics of joints were investigated. The test results were as follows: The joint shear stiffness, peak, and residual shear strength under the CNS boundary condition were predominantly larger than those under the CNL boundary condition. Overall, these parameters were positively correlated with the initial normal stress sigma(n0). When sigma(n0)> 2 MPa, the postpeak shear stress of the CNS boundary condition showed a sharp decrease, whereas that of the CNL boundary condition changed from a slowly decreasing type (sigma(n0)=4 MPa, 6 MPa) to a sharply decreasing type at sigma(n0)=8 MPa. The peak dilation rate under the CNS boundary condition at all levels of normal stress was lower than that of CNL, and the strain softening in postpeak of the latter was more remarkable. In the process of joint shear, the hydraulic aperture displayed a four-stage variation law of "steady-sudden increase-slow increase-basically stable. " Moreover, the hydraulic aperture under the CNS boundary condition was always lower than that under the CNL boundary condition. The seepage pressure increased from 0.5 MPa to 1.5 MPa, and the average hydraulic aperture in the stable stage under normal stress at all levels increased from 0.146 mm to 0.187 mm. In addition, the average peak shear stress and average shear stiffness decreased by 0.9 MPa and 0.83 GPa/m, respectively. We also established a numerical model of a real rough three-dimensional joint, compiled a calculation program for the shear-flow process of a joint under CNS boundary conditions, and visualized the flow channel inside the joint. The seepage flow bypassed the area where the joints contacted each other, forming obvious flow channels. The flow rate increased at the intersection of the flow channels.
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| GB/T 7714 | Cao, Yangbing , Wu, Yang , Zhang, Xiangxiang et al. Experimental Study on the Influence of Hydromechanical Boundary Conditions on Shear-Flow Coupling Characteristics of Granite Joints [J]. | GEOFLUIDS , 2022 , 2022 . |
| MLA | Cao, Yangbing et al. "Experimental Study on the Influence of Hydromechanical Boundary Conditions on Shear-Flow Coupling Characteristics of Granite Joints" . | GEOFLUIDS 2022 (2022) . |
| APA | Cao, Yangbing , Wu, Yang , Zhang, Xiangxiang , Liu, Zhi , Gong, Weiguo , Huang, Zhenping . Experimental Study on the Influence of Hydromechanical Boundary Conditions on Shear-Flow Coupling Characteristics of Granite Joints . | GEOFLUIDS , 2022 , 2022 . |
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