| 应力路径和干湿状态对堆石料颗粒破碎的影响研究 |
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| 引用本文： | 孔宪京,宁凡伟,刘京茂,邹德高,周晨光.应力路径和干湿状态对堆石料颗粒破碎的影响研究[J].岩土力学,2019,40(6):2059-2065. |
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| 作者姓名： | 孔宪京 宁凡伟 刘京茂 邹德高 周晨光 |
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| 作者单位： | 1. 大连理工大学 海岸与近海工程国家重点实验室，辽宁 大连 116024；
2. 大连理工大学 建设工程学部水利工程学院工程抗震研究所，辽宁 大连 116024 |
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| 基金项目： | 国家重点研发计划（No.2017YFC0404902）；国家自然科学基金（No.51678113，No.51779034，No.51608095）；中央高校基本科研业务费资助（No.DUT17ZD219）。 |
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| 摘 要： | 堆石料颗粒破碎是引起高土石坝变形的重要因素。在大坝填筑、蓄水期，堆石料的应力路径和干湿状态均是变化的。通过大型三轴试验，系统地研究了应力路径和干湿状态对堆石料颗粒破碎规律的影响。试验结果表明：（1）相同初始条件下，按不同应力路径达到同一轴向应变停机时测定的颗粒破碎率是不同的，等围压?3试验产生的颗粒破碎最大，等平均主应力p试验的次之，等最大主应力?1试验的最小，但不同应力路径下的颗粒级配演化规律是一致的。（2）相同初始条件下，湿样的颗粒破碎率明显高于干样，且二者的差距随着围压的增大而增大，不同干湿条件下的颗粒级配演化规律同样是一致的。（3）建立的考虑母岩强度的颗粒破碎率与塑性功的关系可以较好地统一描述不同应力路径及干湿状态下的颗粒破碎。该研究成果可为建立复杂应力路径及干湿变化条件下考虑颗粒破碎的堆石料弹塑性本构模型提供依据。
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| 关 键 词： | 堆石料 应力路径 干湿状态 颗粒破碎 三轴试验 |
| 收稿时间： | 2017-12-14 |
Influences of stress paths and saturation on particle breakage of rockfill materials |
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| KONG Xian-jing,NING Fan-wei,LIU Jing-mao,ZOU De-gao,ZHOU Chen-guang.Influences of stress paths and saturation on particle breakage of rockfill materials[J].Rock and Soil Mechanics,2019,40(6):2059-2065. |
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| Authors: | KONG Xian-jing NING Fan-wei LIU Jing-mao ZOU De-gao ZHOU Chen-guang |
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| Institution: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China; 2. Institute of Earthquake Engineering, School of Hydraulic Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China |
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| Abstract: | The particle breakage of rockfill materials is one of the significant factors influencing the deformation behavior of rockfill high dams. The stress paths and saturation of rockfills vary during the process of construction and impoundment. A series of large-scale triaxial tests was systematically conducted to investigate the influences of stress paths and drying-wetting states on particle breakage behaviors. The results show that the particle breakage index under different stress paths is not the same for the same axial strain. The particle breakage index of the constant ?3 test is larger than that of the constant p test and the particle breakage index of constant ?1 test is the least in the three stress paths. The particle breakage index of saturated specimen is higher than that of the dry one with the same initial condition and the gap increases with the confining pressure. The evolution of particle distribution under different stress paths and saturation states is the same. The established relationship between particle breakage index and plastic work considering the strength of the parent rock can well unify the particle breakage index under different stress paths and saturation states. The results can provide valuable references for the elastic-plastic constitutive model considering the particle breakage under complex stress paths and dry and wet conditions. |
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| Keywords: | rockfill material stress path saturation states particle breakage triaxial test |
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