| 摘要: |
| 【目的】研究平面应变状态下岩土材料长期的沉降变形规律。【方法】采用改造的平面蠕变仪对重塑黄土进行一系列固结平面蠕变试验，分析试样在不同含水率、固结压力、剪应力下的变化特性，并利用模型对变化规律进行拟合。【结果】试样在30%含水率、50 kPa固结压力、300 kPa剪应力下，轴向形变量达到最大值14.54%，而且剪应力大小对含水率较高和固结压力较低的土体蠕变效应敏感性较强。数据分析表明，Singh Mitchell和Mesri等经典蠕变模型对试验规律的描述精度较差，而建立的经验模型不仅适合黄土平面蠕变变化规律分析，而且具有参数少且容易获得等优点。【结论】利用所建立的经验模型可以模拟黄土平面应变状态下的蠕变规律。 |
| 关键词: 黄土 平面蠕变 沉降变形 经验模型 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目“基于土体结构性变化的黄土滑坡灾变机理研究”(51178392) |
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| Loess creep in plane strain conditions |
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GUO Hong,LUO Yasheng,HU Lianxin
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| Abstract: |
| 【Objective】The durable settlement deformation of geotechnical materials under plane strain state was investigated.【Method】A series of consolidated plane creep tests were conducted by the reformed plane creep meter to remolded loess,and the change of loess under different water contents,confining pressures and shearing stresses were analyzed.Models were also used to simulate the variations.【Result】The axial deformation reached the largest value of 14.54% when the water content,confining pressure and shearing stress were 30%,50 kPa and 300 kPa,respectively.The sensitivity of creep characteristics with high water content and low confining pressure was more significant in response to shearing stress.The simulation precision by Singh Mitchell model and Mesri model was poor,while the established empirical model could well simulate the deformation plane creep with less and easy obtained parameters.【Conclusion】The established model can be used to simulate loess creep under plane strain state. |
| Key words: loess plane creep settlement deformation empirical model |
