叶万军,强艳红,张 文,等. 增湿-减湿条件下重塑黄土宏微观试验研究[J]. 科学技术与工程, 2020, 20(29): 12058-12064.
YE Wan-jun,QIANG Yan-hong,ZHANG Wen,et al.Macroscopic and Microscopic Experimental Study on Remolded Loess under Humidification-dehumidification Conditions[J].Science Technology and Engineering,2020,20(29):12058-12064. |
| 增湿-减湿条件下重塑黄土宏微观试验研究 |
| Macroscopic and Microscopic Experimental Study on Remolded Loess under Humidification-dehumidification Conditions |
| 投稿时间：2019-12-10 修订日期：2020-06-24 |
| DOI： |
| 中文关键词: 黄土 增湿-减湿 侧限压缩应变 微观结构 |
| 英文关键词:loess humidification-dehumidification confined compression strain microstructure |
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| 中文摘要: |
| 为了明确增湿-减湿作用下重塑黄土的宏观变形特性及微观结构特性,以陕北某填方区黄土为研究对象,利用单杠杆固结仪和扫描电子显微镜对增湿-减湿条件下重塑土体的宏观力学性能和微观结构变化进行分析。研究结果表明：宏观方面,侧向压缩应变与增湿-减湿循环次数呈正相关,并且增湿-减湿循环下侧限压缩应变规律可以用幂函数表示,说明长期的水土相互作用使压实土体强度及承载力降低；微观方面,增湿-减湿循环使压实黄土孔隙结构增大、颗粒形态由扁平状变成圆形以及颗粒接触方式由面-面接触变为点-点接触,导致土体结构松散产生裂缝,颗粒间摩擦力及承载力降低。通过对重塑黄土的宏微观分析,为黄土区域的建设工程提供理论依据。 |
| 英文摘要: |
| In order to clarify the macroscopic deformation characteristics and microscopic structural characteristics of the remolded loess under humidification-dehumidification, the loess in a fill area in northern Shaanxi was taken as the research object. The WG single lever consolidation instrument and scanning electron microscope were used to humidify the remolded -Analysis of macroscopic mechanical properties and microscopic structural changes of soils under dehumidification conditions. The research results show that: in the macroscopic aspect, the lateral compressive strain is positively related to the number of humidification-dehumidification cycles, and the law of the lower limit compressive strain of the humidification-dehumidification cycle can be expressed by a power function, indicating that long-term water-soil interaction causes compaction Soil strength and bearing capacity decrease; microscopically, the humidification-dehumidification cycle increases the pore structure of the compacted loess, changes the particle shape from flat to round, and the particle contact mode changes from surface-to-surface contact to point-to-point contact , Resulting in loose soil structure cracks, friction between particles and bearing capacity reduced. The macroscopic and microscopic analysis of the remolded loess provides a theoretical basis for the construction of loess regions. |
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