复杂水–力路径下非饱和砂质黄土增湿变形特性

doi:10.13722/j.cnki.jrme.2021.0187

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摘要为研究复杂水–力路径下非饱和砂质黄土的增湿变形特性，采用GDS非饱和三轴仪，对非饱和砂质黄土开展偏应力作用下固结–加载–增湿–加载、固结–卸载–增湿–卸载2种复杂水–力路径的单线法三轴增湿试验，全面分析水–力路径和应力比对非饱和砂质黄土增湿变形特性的影响。试验结果表明：(1) 轴向应变与增湿剪应变均随应力比的增加而减小；(2) 应力比为0.25时，试样未达到饱和便发生剪胀破坏；经历加载路径试样比经历卸载路径试样的增湿剪应变、孔隙比发展更快，率先达到破坏；(3) 应力比为0.5和0.75时增湿变形特性基本一致，湿化体应变、增湿剪应变均随湿化参数的增加先增加后趋于稳定，孔隙比随着湿化参数的增加先减小后趋于稳定，经历加载路径试样的最大湿化体应变、增湿剪应变与增湿前初始孔隙比均大于经历卸载路径的试样。

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	蔡国庆1
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	韩博文2
	韦靖威2
	李舰2
	赵成刚2

关键词 ：土力学, 非饱和砂质黄土, 增湿变形, 单线法, 复杂水&ndash, 力路径, 应力比

Abstract：In order to study the wetting-induced deformation characteristics of unsaturated sandy loess under complex hydro-mechanical paths，the single-line triaxial wetting tests of the two complex hydro-mechanical paths of consolidation-loading-wetting-loading and consolidation-unloading-wetting-unloading under deviator stress are carried out by GDS unsaturated triaxial apparatus for unsaturated sandy loess. The effects of hydro-mechanical path and stress ratio on the wetting-induced deformation characteristics of unsaturated sandy loess are comprehensively analyzed. The research results indicate that：(1) Both the axial strain and the wetting shear strain decrease with the increase of stress ratio. (2) When the stress ratio is 0.25，the specimen fails to reach saturation，and then the dilatancy failure occurs. The wetting shear strain and void ratio of the specimens that experienced the loading path develops faster than that experienced the unloading path，and are the first to reach failure. (3) When the stress ratio is 0.5 and 0.75，the wetting deformation characteristics are basically the same. The wetting volumetric strain and moistening shear strain both increase first and then become stable with the increase of the wetting parameters. The void ratio first decreases and then becomes stable with the increase of the wetting parameters. The maximum wetting volumetric strain，wetting shear strain and the initial void ratio before the moistening of the samples that experienced the loading path are all greater than that experienced the unloading path.

Key words： soil mechanics unsaturated sandy loess wetting-induced deformation single-line method complex hydro-mechanical paths stress ratio

引用本文:

蔡国庆1，2，韩博文2，韦靖威2，李舰2，赵成刚2. 复杂水–力路径下非饱和砂质黄土增湿变形特性[J]. 岩石力学与工程学报, 2022, 41(S1): 3073-3080.
CAI Guoqing1，2，HAN Bowen2，WEI Jingwei2，LI Jian2，ZHAO Chenggang2. Wetting deformation characteristics of unsaturated sandy loess under complex hydro-mechanical paths. , 2022, 41(S1): 3073-3080.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0187 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/3073

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