| 饱水和天然状态下页岩滞后效应及阻尼特性研究 |
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| 引用本文： | 蒋长宝,魏 财,段敏克,陈昱霏,余塘,李政科.饱水和天然状态下页岩滞后效应及阻尼特性研究[J].岩土力学,2020,41(6):1799-1808. |
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| 作者姓名： | 蒋长宝 魏 财 段敏克 陈昱霏 余塘 李政科 |
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| 作者单位： | 1. 重庆大学 煤矿灾害动力学与控制国家重点实验室，重庆 400044；2. 重庆大学 资源与安全学院，重庆 400044 |
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| 基金项目： | 国家自然科学基金（No.51674048）；重庆市科技计划（No.cstc2015jcyjA90009）。 |
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| 摘 要： | 运用RLW-2000型微机伺服岩石三轴试验机，对饱水状态和天然状态页岩在不同围压下进行三轴循环加卸载试验，分析了两种含水状态页岩的力学特性和滞后效应，并基于能量原理讨论了阻尼比演化规律。试验结果表明：随循环次数增加，累积残余应变逐渐增加，相对残余应变先降低，后趋于稳定区域，直至破坏前急剧增加；饱水页岩的加卸载变形模量均比天然页岩小，加载变形模量整体比卸载变形模量小；在加载和卸载阶段，均出现应变始终滞后于应力的现象；饱水页岩的滞后效应比天然页岩更明显。提出了考虑滞后效应的能量计算方法，较以往能量计算的误差更小。最后基于能量原理对阻尼比的计算公式进行修正，发现饱水页岩的阻尼比比天然页岩大。阻尼比的变化较好地反映了页岩损伤机制，可作为预判页岩失稳破坏的重要指标。
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| 关 键 词： | 页岩 力学特性 滞后效应 能量 阻尼比 |
| 收稿时间： | 2019-06-02 |
| 修稿时间： | 2019-11-21 |
Hysteresis effect and damping characteristics of shale under
saturated and natural state |
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| JIANG Chang-bao,WEI Cai,DUAN Min-ke,CHEN Yu-fei,YU Tang,LI Zheng-ke.Hysteresis effect and damping characteristics of shale under
saturated and natural state[J].Rock and Soil Mechanics,2020,41(6):1799-1808. |
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| Authors: | JIANG Chang-bao WEI Cai DUAN Min-ke CHEN Yu-fei YU Tang LI Zheng-ke |
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| Institution: | 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;
2. School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China |
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| Abstract: | An RLW-2000 micro-computer servo-control rock triaxial testing machine was used to carry out triaxial cyclic loading and unloading experiments of saturated and natural shales under different confining pressures. The mechanical properties and hysteresis effects of two hydrated shales were analyzed. The evolution law of the damping ratio was discussed based on the energy principle. The experimental results show that as the cycle number increases, the cumulative residual strain increases gradually. The relative residual strain decreases first and then tends to a stable region, and finally increases rapidly prior to the rock damage. The deformation modulus of the saturated shale is smaller than that of the natural shale during the loading and unloading process. Besides, the loading deformation modulus is smaller than that of the unloading deformation modulus. In the loading and unloading stages, it is observed that the strain always lags the stress. The hysteresis effect of saturated shale is more obvious than that of natural shale. An energy calculation method is proposed considering the hysteresis effect with a smaller error of the calculated energy compared with that of the previous energy calculation. Finally, the calculation formula of the damping ratio is revised based on the energy principle. It is found that the damping ratio of saturated shale is larger than that of natural shale. The change of damping ratio reflects the shale damage mechanism, which can be used as an important indicator to predict the instability of shale. |
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| Keywords: | shale mechanical properties hysteresis effect energy damping ratio |
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