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| 1 | 深部节理岩体分区破裂化机制数值研究显示文摘基于深部地下工程围岩反复承受地质力作用和开挖扰动,其完整性和力学性能弱化的现实,认为其应力-应变关系服从峰后软化的遍布节理模型,然后考虑节理、原岩应力以及影响岩体性质的变形参数和强度参数等因素,设计模拟方案,利用FLAC3D数值软件,再现了围岩分区破裂化过程。模拟结果表明:节理的存在和分布对分区破裂化现象的形态和规模存在很大影响。岩体强度与原始应力场的相对关系是引发围岩分区破裂化的关键。当初始地应力超出岩体单轴抗压强度时,围岩将出现分区破裂现象,初始力相对于岩体强度、泊松比的增大与分区破裂的数目、破裂区延伸长度、破裂区范围等成近似的正比,而内摩擦角则呈现相反趋势。这一结果部分揭示了分区破裂发生的力学机制,为深部围岩支护设计理论的建立提供了有益参考。 | 苏永华 郑璇 | 2013 | 公路交通科技2013，30，1： | 8 |
| 2 | Rockburst characteristics of several hard brittle rocks:A true triaxial experimental study显示文摘Rockburst is a typical rock failure which frequently threatens both human life and construction equipment during highly stressed underground excavation.Rock lithology is a control factor of rockburst.In this paper,rockburst tests were conducted on rectangular prismatic specimens of six types of intact hard brittle rocks,i.e.granodiorite,granite,marble,basalt,sandstone and limestone,under one-free-face true triaxial loading conditions.With the use of high-speed cameras,an acoustic emission(AE)system and a scanning electron microscope(SEM),rockburst of different rocks was investigated.The results show that the strainbursts of granodiorite,granite and marble were accompanied by tensile splitting near the free face,and consequently were relatively strong with a large amount of fragment ejection and kinetic energy release.For basalt,sandstone and limestone,failure was primarily dominated by shear rupture.The strainbursts of basalt and sandstone were relatively small with minor fragment ejection and kinetic energy release;while no burst failure occurred on limestone due to its relatively low peak strength.Rock strength,fracturing and fragmentation characteristics,and failure modes of different rocks can significantly affect rockburst proneness and magnitude.The AE evolution coupled with SEM analysis reveals that the differences in the inhe rent microstructures and fracture evolution under loading are the primary factors accounting for different rockbursts in various rock types. | Shaobin Zhai Guoshao Su Shunde Yin Bin Zhao Liubin Yan | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，2： | 4 |
| 3 | Excavation-induced deep hard rock fracturing:Methodology and applications显示文摘To analyze and predict the mechanical behaviors of deep hard rocks,some key issues concerning rock fracturing mechanics for deep hard rock excavations are discussed.First,a series of apparatuses and methods have been developed to test the mechanical properties and fracturing behaviors of hard rocks under high true triaxial stress paths.Evolution mechanisms of stress-induced disasters in deep hard rock excavations,such as spalling,deep cracking,massive roof collapse,large deformation and rockbursts,have been recognized.The analytical theory for the fracturing process of hard rock masses,including the three-dimensional failure criterion,stress-induced mechanical model,fracturing degree index,energy release index and numerical method,has been established.The cracking-restraint method is developed for mitigating or controlling rock spalling,deep cracking and massive collapse of deep hard rocks.An energy-controlled method is also proposed for the prevention of rockbursts.Finally,two typical cases are used to illustrate the application of the proposed methodology in the Baihetan caverns and Bayu tunnels of China. | Xia-Ting Feng Cheng-Xiang Yang Rui Kong Jun Zhao Yangyi Zhou Zhibin Yao Lei Hu | 2022 | Journal of Rock Mechanics and Geotechnical Engineering2022，14，1： | 4 |
| 4 | 露天爆破振动作用下地下多层采空区稳定性数值模拟分析显示文摘针对露天采场下方的多层地下空区在爆破振动影响下的稳定性进行了分析,根据露天采场小规模的爆破振动测试采集到的爆破地震波数据,得到了PPV预测公式和PF预测公式;进而建立ANASYS数值模型进行分析,确定了实验爆破振动情况下现有空区的稳定性,得到了适用于龙潭村铁矿采空区的PPV衰减规律,并计算得到了不同最大段装药量下露天采场爆区到采空区的安全距离。 | 李岩 孙威 | 2019 | 矿业研究与开发2019，39，4： | 3 |
| 5 | Periodical zonal character of damage near the openings inhighly-stressed rock mass conditions显示文摘Rock mass damage at great depths near underground openings is often of a zonal character.However,the classical elastoplastic theory fails to explain sufficiently all properties of zonal failure structures.A new non-Euclidean mathematical model for highly-stressed rock mass was developed based on the principles of mechanics of defected material and non-equilibrium thermodynamics.Methods were developed to determine model parameters that provide satisfactory correspondence between the experimental findings concerning faulted zonal structures near openings at great depths and mathematical calculations.The mechanism of this phenomenon was discovered which consisted in a periodical character of stresses in the surrounding rock mass and development of tensile macrocracks at zones of maximal tangential stresses.Main relationships between the cracking zone width and rock mass strength were established. | Vladimir VMakarov Mikhail AGuzev Vladimir NOdintsev Lyudmila SKsendzenko | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，2： | 3 |
| 6 | 压剪荷载作用下双隧道围岩的剪切型岩爆:对比分析显示文摘认识剪切型岩爆的触发机理对地下工程科学设计与安全施工具有重要意义。为揭示隧道围岩(DTR)的剪切触发型岩爆机理,进行了砂岩的双矩形隧道和双圆形隧道物理模型剪切试验。在剪切试验过程中,利用高速摄像机和声发射监测仪对DTR的岩爆过程进行监测和记录,揭示了压剪下DTR的宏观和细观断裂特征;进而建立了5种隧道间距数值模型,分析了压剪下含隧洞试样连续-非连续剪切过程及其触发的岩爆机理;提出了一种新的能量冲击指数(S)来评价剪切型岩爆倾向性。试验结果表明,在剪切试验中,DTR的实时剪切特征、内外破裂特征和微裂纹数演化特征可划分为4个典型阶段:整体剪切压缩阶段(Ⅰ阶段)、以裂纹萌生为主的弹性阶段(Ⅱ阶段)、以裂纹扩展-贯通和剪切岩爆为主的剪切破裂阶段(Ⅲ阶段)和剪切摩擦阶段(Ⅳ阶段)。此外,试验结果还表明DTR在剪切型岩爆发生后可形成对称猫耳形缺口;微裂纹演化过程中DTR经历了裂纹预备阶段(Ⅰ阶段)、裂纹初始增长阶段(Ⅱ阶段)、裂纹快速增长阶段(Ⅲ阶段)和裂纹稳定阶段(Ⅳ阶段)。更重要的是,综合分析发现,双矩形隧道和双圆形隧道触发剪切型岩爆机制存在差别的本质是截面形状导致的结构效应,即双矩形隧道和双圆形隧道应力场分布差异导致断裂行为不同。研究结果有利于加深对剪切型岩爆机理的认识,为岩土工程防治提供理论依据。 | 辛杰 江权 翟迪 丰光亮 何本国 李邵军 | 2023 | Journal of Central South University2023，30，12： | 0 |
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