| 不同压实度和基质吸力的粉煤灰三轴试验研究 |
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| 引用本文： | 王欢,陈群,王红鑫,张文举.不同压实度和基质吸力的粉煤灰三轴试验研究[J].岩土力学,2019,40(Z1):224-230. |
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| 作者姓名： | 王欢 陈群 王红鑫 张文举 |
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| 作者单位： | 1. 四川大学 水利水电学院水力学，四川 成都 610065；2. 四川大学 山区河流开发保护国家重点实验室，四川 成都 610065；
3. 商丘市城区河道管理所，河南 商丘 476000；4. 中国市政工程西南设计研究总院有限公司，四川 成都 610081 |
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| 摘 要： | 粉煤灰的非饱和抗剪强度是准确分析非饱和状态灰坝的稳定性所必需的，但目前对其研究积累较少。通过控制不同压实度、不同基质吸力、不同净围压对粉煤灰进行一系列非饱和土三轴试验，探讨压实度和基质吸力对粉煤灰应力?应变关系曲线和强度参数的影响。研究结果表明，基质吸力较低时粉煤灰的应力?应变曲线没有峰值，呈硬化型；基质吸力逐渐增大时应力?应变曲线有明显的峰值，呈软化型；压实度越大，非饱和粉煤灰试样的应力?应变曲线的软化特征越明显，总黏聚力和内摩擦角均越大；非饱和粉煤灰的总黏聚力随着基质吸力的增大而逐渐增大，增大速率逐渐变缓，最后趋于稳定；不同基质吸力粉煤灰试样的内摩擦角变化不大，并且都近似等于饱和试样的内摩擦角；随着基质吸力的增大，吸力内摩擦角对粉煤灰试样的抗剪强度的贡献越来越小。研究得出的非饱和粉煤灰的抗剪强度特性对灰坝的设计和稳定性分析具有理论意义和工程实用价值。
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| 关 键 词： | 粉煤灰 抗剪强度 压实度 基质吸力 |
| 收稿时间： | 2019-01-27 |
Triaxial tests on fly ash with different compaction and matric suction |
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| WANG Huan,CHEN Qun,WANG Hong-xin,ZHANG Wen-ju.Triaxial tests on fly ash with different compaction and matric suction[J].Rock and Soil Mechanics,2019,40(Z1):224-230. |
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| Authors: | WANG Huan CHEN Qun WANG Hong-xin ZHANG Wen-ju |
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| Institution: | 1. College of Water Resources and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China; 2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 3. Shangqiu City District River Management Office, Shangqiu, Henan 476000, China; 4. Southwest Municipal Engineering Design & Research Institute of China, Chengdu, Sichuan 610081, China |
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| Abstract: | The unsaturated shear strength of fly ash is necessary for precise stability analysis of ash dams in unsaturated cases. However, less studies can be taken for references in this research field currently. A series of triaxial tests of unsaturated fly ash were carried out by controlling compaction, matric suction, and net confining pressures, and the effects of compaction and matric suction on the stress-strain curve and strength parameters of fly ash were discussed. The results show that the stress-strain curve of fly ash has no obvious peak and shows strain hardening characteristic when the matric suction is low. When the matric suction is gradually increased, the stress-strain curve has an obvious peak and presents the strain softening characteristics. If the compaction degree is larger, the strain softening characteristic is more obvious and the total cohesion and the effective internal friction angle are bigger. The total cohesion of the unsaturated fly ash increases with the increase in the matric suction, and the increase rate is gradually slower and tends to be stable. The effective internal friction angle of the fly ash sample with different matric suctions has little change, and is nearly equal to the effective internal friction angle of the saturated sample. As the matric suction increases, the contribution of the internal friction angle to the shear strength of the fly ash sample becomes smaller and smaller. The shear strength characteristics of unsaturated fly ash obtained in this paper have theoretical significance and engineering practical value for the design and stability analysis of ash dams. |
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| Keywords: | fly ash shear strength compactness matric suction |
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