| 考虑刚度劣化的剪切带-围岩系统稳定性分析 |
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| 引用本文： | 王学滨,潘一山,代树红.考虑刚度劣化的剪切带-围岩系统稳定性分析[J].防灾减灾工程学报,2009,29(2). |
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| 作者姓名： | 王学滨 潘一山 代树红 |
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| 作者单位： | 辽宁工程技术大学力学与工程科学系,辽宁,阜新,123000 |
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| 基金项目： | 青年基金，国家自然科学基金重大项目 |
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| 摘 要： | 峰后的刚度劣化现象(渐进损伤)在多种煤、岩石、混凝土、土和砂子的循环加载实验中已被观察到。本文考虑了剪切带及带外弹性体的不同的刚度劣化现象,推导了剪切带(断层)-弹性围岩系统在直剪条件下的应力—变形曲线。剪切带的刚度劣化不改变剪切带的总变形,但使剪切带的弹性变形增加、塑性变形降低。考虑弹性体的刚度劣化现象之后,系统的峰后应力—变形曲线呈现非线性特征,这不同于过去忽略刚度劣化现象的结果。在应变软化过程中,剪切带之外弹性体的刚度劣化,使系统的峰后响应由负斜率(Ⅰ类行为)变为正斜率(Ⅱ类变形行为)。较高的弹性体尺寸、较高的脆性、较小的内部长度、较低的围岩初始弹性模量、较高的抗剪强度、较低的残余剪切应力及较高的残余剪切弹性模量,使系统的峰后响应变得陡峭,甚至发生Ⅱ类行为,使系统的失稳(岩爆、冲击地压、采矿诱发地震或矿震)易于发生。
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| 关 键 词： | 围岩 剪切带 剪切应力 剪切变形 刚度劣化 稳定性分析 |
Stability Analysis of Shear-band and Surrounding-rock System Considering Stiffness Deterioration |
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| WANG Xue-bin,PAN Yi-shan,DAI Shu-hong.Stability Analysis of Shear-band and Surrounding-rock System Considering Stiffness Deterioration[J].Journal of Disaster Prevent and Mitigation Eng,2009,29(2). |
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| Authors: | WANG Xue-bin PAN Yi-shan DAI Shu-hong |
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| Institution: | WANG Xue-bin,PAN Yi-shan,DAI Shu-hong (Department of Mechanics and Engineering Sciences,Liaoning Technical University,Fuxin 123000,China) |
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| Abstract: | The phenomenon of stiffness deterioration(progressive damage) beyond the peak stress has been observed in cyclic loading tests of coals,rocks,concretes,soils and sands.In this paper,different cases of degraded stiffness in a system of shear-band(or fault) and its outside elastic rock were taken into account to derive the post-peak stress-deformation curve of the system in the direct shear condition.When stiffness deterioration in the shear-band is considered,the total shear deformation of the shear-band doe... |
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| Keywords: | surrounding rock shear-band shear stress shear deformation stiffness deterioration stability analysis |
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