长江科学院院报 ›› 2021, Vol. 38 ›› Issue (5): 88-93.DOI: 10.11988/ckyyb.20200279

• 岩土工程 • 上一篇    下一篇

渣场松散碎石土应力-应变特性研究

王家辉1, 江洎洧1, 饶锡保1, 黄帅2, 周欣华1   

  1. 1.长江科学院 水利部岩土力学与工程重点实验室,武汉 430010;
    2.长江勘测规划设计研究有限责任公司,武汉 430010
  • 收稿日期:2020-04-03 修回日期:2020-05-26 出版日期:2021-05-01 发布日期:2021-05-17
  • 作者简介:王家辉(1993-),男,山西吕梁人,硕士研究生,研究方向为松散土石体的基本特性。E-mail: h130719203@163.com
  • 基金资助:
    国家重点研发计划项目(2017YFC0404806);国家自然科学基金项目(51979009);中央级科研院所基本科研业务费项目(CKSF2019191/YT)

Stress-Strain Characteristics of Incompact Coarse-grained Soil in Slag Field

WANG Jia-hui1, JIANG Ji-wei1, RAO Xi-bao1, HUANG Shuai2, ZHOU Xin-hua1   

  1. 1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China;
    2. Changjiang Institute of Survey, Planning, Design and Research Co.,Ltd., Wuhan 430010, China
  • Received:2020-04-03 Revised:2020-05-26 Online:2021-05-01 Published:2021-05-17

摘要: 对取自某渣场边坡坡顶和坡底的2种松散碎石土试样,开展了4组大型三轴固结排水剪切试验,研究了松散碎石土剪切破坏过程中的应力与应变、体应变与轴向应变、实测泊松比随应力水平变化的关系以及邓肯-张E-νE-B模型的适用性。研究结果表明:①渣场松散碎石土应力-应变曲线基本呈硬化型、无显著峰值、强度参数φ与选取的应变标准关系密切且随应变标准的增加而变大;②松散碎石土在剪切破坏过程中基本呈单调剪缩,表明剪切过程中试样内部以颗粒平动引起的结构压缩为主,而由颗粒转动和力链调整引起的剪胀基本可忽略;③松散碎石土实测泊松比与应力水平基本呈线性关系,且坡顶与坡底料有较明显的差异。从实测泊松比与邓肯-张模型比较结果来看,邓肯-张E-B模型对坡顶料有较好的适用性,而坡底料比较适用于邓肯-张E-ν模型。

关键词: 弃渣场, 松散碎石土, 应力-应变曲线, 大型三轴试验, 泊松比, 邓肯-张模型

Abstract: Four groups of large-scale triaxial consolidated-drained shear test were carried out on two types of incompact coarse-grained soil samples taken from the top and bottom of slope at a slag field. The relations of stress and strain, volumetric strain and axial strain, measured Poisson’s ratio against stress level, as well as the applicability of Duncan-Chang E-ν and E-B models were examined. Research results demonstrated that: 1) the stress-strain curve of the incompact coarse-grained soil displayed hardening features with no significant peak. Strength parameter φ was closely related to and augmented along with the increase of reference strain. 2) The incompact coarse-grained soil showed monotonous shear shrinkage in the whole process of shearing, which indicated that the structural compression caused by translational motion of particles dominated the whole process, while the particle rotation and force chain adjustment were negligible. 3) The measured Poisson’s ratio was in a linear relation with stress level, yet with an evident difference between top and bottom materials of slope. In addition, the Duncan-Chang E-B model had a good fitting result for the Poisson’s ratio of slope top materials, while the Duncan-Chang E-ν model was more applicable for slope bottom materials.

Key words: slag field, incompact coarse-grained soil, stress-strain curves, large-scale triaxial test, Poisson’s ratio, Duncan-Chang model

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