| 摘要: |
| 为了研究密度与应力水平对珊瑚砂强度和变形特性的影响，本文利用三轴仪，对珊瑚砂试样开展了一系列不同密度、不同应力水平条件下的三轴固结排水剪试验，根据试验结果分析了珊瑚砂密度和应力水平对其应力应变、体积变形特性及强度特性等的影响。研究表明，对于不同相对密度的试样均表现出剪胀的特性，对于同一初始密度的试样，围压越大其剪胀现象越不显著。珊瑚砂的初始切线模量随着围压和相对密度的增大而增大，可近似用直线表示，文中建立了初始切线模量与相对密度和围压的关系式。相变点应变随着围压的增大而增大，随着相对密度的增大而减小。珊瑚砂的强度指标φ0和Δφ随着相对密度的增大而呈线性增大趋势，并给出了强度指标与相对密度之间的关系式。 |
| 关键词: 珊瑚砂 密度 应力变形 三轴试验 围压 |
| DOI： |
| 分类号:TU43 |
| 基金项目:国家自然科学(51879167)；江苏省自然科学(BK20151071)；中央级非营利性科研院所基金创新团队项目(Y317011)；中央级公益性科研院所基本科研业务费专项资金(Y318009；Y318010) |
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| Research on strength-deformation behavior of coral sand with different densities and stress levels |
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HOU Heying1, CAO YONGyong1, ZHANG Shaodong2, GUAN Yunfei1
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1.Department of Geotechnical Engineering,Nanjing Hydraulic Research Institute;2.Beijing Urban Construction Group Company Limited
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| Abstract: |
| In order to study the influence of density and stress level on the strength and deformation characteristics of coral sand, a series of triaxial consolidation drained shear tests with different densities and stress levels are carried out using triaxial apparatus. The experimental results show that the density and stress level of coral sand have little impact on its stress-strain, volume deformation characteristics and strength characteristics. The results show that the specimens with different relative densities have the characteristics of dilatancy. For the same initial density, the larger the confining pressure, the less the dilatancy. The initial tangential modulus of coral sand increases with the increase of confining pressure and relative density, which can be approximately linear. The relationship between initial tangent modulus, relative density and confining pressure is established. The strain at phase transition point increases with the increase of confining pressure and decreases with the increase of relative density. The strength indexes of coral sand increase linearly with the increase of relative density, and the relationship between them is established. |
| Key words: coral sand density stress and deformation triaxial test confining pressure |
