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朱材峰,朱俊高,潘政.密实度对粗粒料力学特性影响三轴试验研究[J].河北工程大学自然版,2021,38(2):24-30
密实度对粗粒料力学特性影响三轴试验研究
Triaxial Test Study on the Influence of Compactness on Mechanical Properties of Coarse Granule
投稿时间:2021-01-21  
DOI:10.3969/j.issn.1673-9469.2021.02.005
中文关键词:  三轴试验  相对密实度  邓肯-张模型  峰值强度  强度指标
英文关键词:triaxial test  relative density  Duncan-Chang model  peak intensity  strength index
基金项目:国家自然科学基金委员会-雅砻江流域水电开发有限公司雅砻江联合基金资助项目(U1865104);长江水科学研究联合基金重点支持项目(U2040221)
作者单位
朱材峰 河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098 
朱俊高 河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098 
潘政 四川电力设计咨询有限责任公司, 四川 成都 610016 
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中文摘要:
      针对3种不同相对密实度的某大坝覆盖层无粘性粗粒料制作试验替代料,进行不同围压下的常规三轴固结排水剪试验,着重研究不同相对密实度对粗粒料力学特性的影响。试验结果表明:在达到峰值强度之前,随着相对密实度和围压的增大,初始切线模量逐渐增大;同一围压下,随着相对密实度的增大,应力应变曲线软化现象更加明显,剪胀性逐渐变强;密实度对试样破坏时的偏应力影响较大,对残余偏应力影响较小。同时,研究发现邓肯-张模型参数Rfn基本不受密实度的影响,K与密实度呈正相关;引入新的参数λ定义为软化系数,定量分析了软化系数λ随围压和密实度的变化关系;强度指标与密实度之间基本呈线性增长规律,给出了粗粒料的抗剪强度指标与密实度之间的拟合关系式。
英文摘要:
      The Conventional triaxial consolidation drainage shear tests under different confining pressures were carried out for three kinds of non-viscous coarse particles in the overburden of a dam, and the effects of different relative compactness on mechanical properties of coarse particles were studied. The results show that before reaching the peak strength, with the increase of relative density and confining pressure, the initial tangent modulus and peak strength increase correspondingly. The relationship between the initial tangent modulus and confining pressure is a power function under the same relative density. Under the same confining pressure, with the increase of relative density, the stress-strain curve shows a more obvious softening phenomenon. The dilatancy of the sample gradually increases, and the axial strain corresponding to the peak strength gradually decreases. The relative density has a great influence on the deviator stress of the sample during failure, but has little influence on the residual deviator stress. Meanwhile, the study found that the parameters Rf and n of the Duncan-Chang model are basically not affected by the density, and K has a positive correlation with the density. A new parameter λ is introduced to quantitatively analyze the relation of parameter λ with confining pressure and compactness. The relationship between the strength index and the relative density is linear, and the relationship between the shear strength index and the relative density is given.
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