| 蠕变加载条件下大理岩弹性储能的演化特征 |
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| 作者姓名： | 李东阳 陆镜夷 刘波 王士杰 李赛格 |
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| 作者单位： | 中国矿业大学(北京)力学与建筑工程学院，北京 100083 |
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| 基金项目： | 国家自然科学基金41771083中国矿业大学(北京)越崎青年基金800015Z1200 |
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| 摘 要： | 为研究蠕变过程中大理岩对能量的吸收转化特征和应变能的释放与耗散机理，测试分析了大理岩在单轴循环加载和多级蠕变循环加载条件下的应力-应变关系，计算得到各自的弹性能密度曲线，采用幂函数拟合了大理岩弹性能密度与应力之间的关系。对比两种加载方式的测试数据，结果表明:单轴循环加载和多级蠕变循环加载试验的弹性能密度曲线基本重合，即加载模式不影响大理岩的弹性能密度变化特征；两种加载模式下大理岩材料都经历压密、稳定和劣化三个阶段。经历蠕变循环加载之后的大理岩试样，弹性储能能力会降低，约为单轴循环加载的43 %；强度也有明显下降，约为单轴循环加载的62 %。如果考虑长期承载问题，大理岩的最大应力值应控制在材料的压密阶段结束点对应的应力以下较为有利。
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| 关 键 词： | 大理岩 蠕变加载 弹性能密度 弹性能比例 |
| 收稿时间： | 2021-04-15 |
Evolution characteristics of elastic energy storage of marble under creep loading |
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| Affiliation: | School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China |
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| Abstract: | In order to study the energy absorption and transformation characteristics of marble, the release of strain energy and dissipation mechanism during creep process, this paper tested the stress-strain relationship of marble under uniaxial cyclic loading and multi-level creep cyclic loading respectively, and calculated their elastic energy density curves.The power function is used to fit the relationship between elastic energy density and stress of marble.By comparing the test data of the two loading modes, the results showed that the elastic energy density curves of uniaxial cyclic loading and multi-level creep cyclic loading were basically coincident, and they have the same elastic energy density curves, which means neither the creep loading mode nor the uniaxial cyclic loading mode will affect the elastic energy density curve of the marble.Comparing the ratio of elastic energy to external power in two loading modes, the results showed that the marble materials all went through three stages: compaction, stabilization and deterioration.After creep cyclic loading, the elastic energy storage capacity of marble would decrease to 43 % of uniaxial cyclic loading.Correspondingly, its strength also decreased obviously, which was 62 % of uniaxial cyclic loading.If the long-term bearing issue of this kind of marble is taken into account, the maximum stress value should be controlled below the stress that corresponds to the end point of the compaction stage of material. |
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