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| 循环载荷作用下级配碎石力学特性试验研究 |
| Experimental study on mechanical properties of graded aggregate under cyclic loading |
| Received:September 17, 2018 Revised:November 02, 2019 |
| DOI：10.7520/1001-4888-18-210 |
| 中文关键词: 循环载荷 级配碎石 累积变形 回弹模量 破碎度 |
| 英文关键词:cyclic loading graded aggregate cumulative deformation resilience modulus fragmentation |
| 基金项目:国家自然科学基金项目(51404266) |
| Author Name | Affiliation | | ZHANG Wen-li | School of Mechanics and Civil Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China | | FENG Mei-mei* | School of Mechanics and Civil Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China | | WU Jiang-yu | School of Mechanics and Civil Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China |
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| 中文摘要: |
| 级配碎石广泛应用于铁路和公路路基，本文以提高路基服役性能、完善路基结构优化设计为研究目的，通过循环载荷作用试验，分析了不同频率以及不同幅值下级配碎石变形、破碎规律，建立了频率、幅值与级配碎石累积变形、回弹模量等力学参数间的关系。结果表明，载荷频率是影响级配碎石变形特性的主要因素；低频作用下，级配碎石破碎度随着载荷频率的增加而降低，这主要与载荷作用时间有关，而随着载荷幅值的增加，级配碎石破碎度呈增长的趋势。此外，不论在载荷频率还是幅值影响下，级配碎石回弹模量与累积变形间总呈正相关关系，然而，当以载荷频率为试验影响因素时，级配碎石累积变形、回弹模量均随破碎度的增加而减小，与载荷幅值为影响因素下的变化规律恰恰相反，这主要与载荷作用形式以及颗粒破碎形式有关。 |
| 英文摘要: |
| Graded aggregate is widely used in railway and highway subgrade. The purpose of this paper is to improve the service performance of subgrade and to optimize the design of subgrade structure. The deformation and breaking laws of graded aggregate at different load frequencies and amplitudes are analyzed by cyclic loading tests. The relationships between load frequency, load amplitude and mechanical parameters (cumulative deformation, modulus of resilience, degree of breakage) of graded aggregate are constructed. The results show that, the load frequency is the main factor affecting the deformation characteristics of graded aggregate. Under the effect of low frequency, the fragmentation rate of graded aggregate is negatively correlated with the frequency, which is mainly related to the time period of loading. There is a positively linear relationship between the fragmentation degree of graded aggregate and the load amplitude. In addition, whether the load frequency or amplitude is changed, the resilience modulus of graded aggregate is always consistent with the rule that the cumulative deformation changes with the load. However, when the load frequency is taken as the influencing factor, the cumulative deformation and resilience modulus of graded aggregate decrease with the increase of degree of crushing, contrary to the variation rule under the influence of load amplitude, which is mainly related to the load acting form and the particle crushing mode. |
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