| 引用本文: | 李雅阁,金龙哲,谭昊,王浩.胶结充填体力学特性的加载速率效应试验[J].哈尔滨工业大学学报,2016,48(9):49.DOI:10.11918/j.issn.0367-6234.2016.09.009 |
| LI Yage,JIN Longzhe,TAN Hao,WANG Hao.Experiment of loading rate effect on mechanical characteristics of cemented filling body[J].Journal of Harbin Institute of Technology,2016,48(9):49.DOI:10.11918/j.issn.0367-6234.2016.09.009 |
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| 摘要: |
| 为探究胶结充填体在不同加载速率状态下的力学参数变化规律及其破坏模式，采用数显式压力机分别对2.0、4.0、6.0、8.0 mm/min这4种加载速率下的胶结充填体开展单轴压缩试验. 试验结果表明：在2.0～8.0 mm/min加载速率范围内，加载速率对于胶结充填体的抗压强度值和割线模量均具有明显的强化效应，且峰值抗压强度值和割线模量随加载速率增大而增大.峰值抗压强度与加载速率呈多项式函数规律，而割线模量与加载速率则呈指数函数分布规律. 且随着加载速率增大，胶结充填体试件破坏形式表现为拉剪混合破坏向单一剪切破坏形式逐渐转化. 研究结果揭示了胶结充填体的力学特性加载速率效应，为研究充填体破坏机制提供一定的参考依据.
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| 关键词: 胶结充填体 单轴抗压强度 加载速率 割线模量 破坏模式 |
| DOI：10.11918/j.issn.0367-6234.2016.09.009 |
| 分类号:TD853 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51574017) |
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| Experiment of loading rate effect on mechanical characteristics of cemented filling body |
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LI Yage1,2, JIN Longzhe1,2,TAN Hao1, WANG Hao1
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（1.School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2.Mine Emergency Technology Research Center, University of Science and Technology Beijing, Beijing 100083, China）
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| Abstract: |
| In order to investigate the mechanical parameters and failure modes of cemented filling body under different loading rates,four loading rates between 2.0 mm/min and 8.0 mm/min were utilized to develop uniaxial compressive test. The research shows that: the loading rate has an obvious strengthening effect on the peak strength and secant modulus value of the cemented filling body samples. As the loading rate increases,the peak strength and secant modulus also rise. In addition,the peak strength corresponds to the loading rates,fitting a polynomial function. And the secant modulus and loading rate meet the exponential function. Along with the increasing loading rates,the cemented filling body samples show a gradual transformation from mixed failure to the single shear failure mode. The test characteristics of the loading rate effect on the mechanical properties of cemented filling body are revealed,which provides a theoretical basis for the study of failure mechanism of filling body.
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| Key words: cemented filling body uniaxial compressive strength (UCS) loading rate secant modulus failure modes |
