| 摘要: |
| 【目的】构建一个描述黄土结构性损耗的参数——结构性损耗度，探讨结构性损耗度的变化规律，并分析结构性损耗度与湿陷系数的关系。【方法】通过分析黄土在荷载和水共同作用下的结构性演化过程，构建结构性损耗度参数，并对甘肃兰州、陕西杨凌两地黄土进行不同含水率条件（5%，12%，18%，26%，33%）下的侧限压缩试验及湿陷性试验，计算结构性损耗度和湿陷度。【结果】土体结构性损耗度大小变化为0～1。结构性损耗度与湿陷系数呈负相关，湿陷度与湿陷系数之间呈正相关。兰州黄土的湿陷度变化为0.003～0.043，杨凌黄土的湿陷度变化为0.001～0.039。【结论】黄土的结构性损耗度随含水率的增大而增大，湿陷系数与结构性损耗度呈负相关。 |
| 关键词: 黄土结构性 结构性损耗度 湿陷度 |
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| 基金项目:国家自然科学基金项目(50578134)；教育部新世纪优秀人才支持计划项目(NECT-06-0864) |
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| Loess constitutive loss |
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CHENG Dawei, LUO Yasheng, CHEN Xi,et al
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College of Water Resources and Architectural Engineering ,Northwest A＆F University
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| Abstract: |
| 【Objective】The paper constructs a parameter depicting the structural loess constitutive loss,explores structural loss change rules,and analyses the relationship between structural loss and collapsible coefficient.【Method】The research studies loess structure evolution under the load and water.According to the theory of soil structure,the research constructs structural loess and testes constitutive loss and collapsibility degree with Lanzhou and Yangling loess in different water conditions (5%,12%,18%,26%,33%),using the confined compression test and collapsible test.【Result】The loess structural loss is 0 to 1.The slope of curve between structural loss and collapsible coefficient is less than 0.The slope of curve between collapsibility degree and collapsible coefficient is more than 0,while the collapsibility degree of Lanzhou loess is from 0.003 to 0.043,and that of Yangling loess is from 0.001 to 0.039.【Conclusion】The collapsible of loess increases with moisture content increasing.The soil structural loss and collapsible coefficient are negative correlated. |
| Key words: structural characteristics of loss constitutive loss collapsibility degree |
