不同含水率-冻结温度-骆驼刺根系含量下砂土冻融变形规律研究  

Freeze-thaw deformation pattern of sandy soil under different moisture contents,freezing temperatures,and Alhagi sparsifolia root contents

作　　者：罗宣兵 李清林 陈文娟 杨潇飞 张美雪 LUO Xuan-bing;LI Qing-lin;CHEN Wen-juan;YANG Xiao-fei;ZHANG Mei-xue(School of Water Conservancy and Architecture,Shihezi University,Shihezi,Xinjiang 832000,China;Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production&Construction Corps,Shihezi University,Shihezi,Xinjiang 832000,China;College of Science,Shihezi University,Shihezi,Xinjiang 832000,China)

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832000 [2]石河子大学寒旱区生态水利工程兵团重点实验室,新疆石河子832000 [3]石河子大学理学院,新疆石河子832000

出　　处：《岩土力学》2025年第4期1174-1186,共13页Rock and Soil Mechanics

基　　金：国家自然科学基金青年基金(No.42102312);新疆生产建设兵团青年拔尖人才项目(No.2024DB050);石河子大学青年创新拔尖人才项目(No.CXBJ202313)。

摘　　要：以新疆天山北麓典型砂土与荒漠植被骆驼刺根系为研究对象,研究不同冻结温度下含水率及骆驼刺根系含量变化对砂土冻融变形的影响,模拟自然冻融条件开展室内单向冻结试验,利用正交试验确定各因素与砂土冻融变形的相关性和显著性,分析砂土在不同含水率、冻结温度和含根量下的冻融变形机制,提出了砂土冻融变形拟合公式。结果表明:3种不同因素对冻融砂土最大变形量影响的主次顺序为含水率>冻结温度>含根量,冻融砂土最大变形量与含水率呈线性正相关,而与冻结温度呈线性负相关,与含根量呈二次函数关系;低含水率素砂土与含根砂土在冻结前期发生冻缩现象,在融化阶段发生融胀现象,而高含水率素砂土与含根砂土在冻结前期发生缓慢冻胀,融化阶段发生融沉现象。基于此规律建立了多因素回归模型,该模型能够较准确地预测冻融砂土的最大变形量,同时能够为寒旱区植被生态护坡的安全评价提供参考。This study focuses on the freeze-thaw deformation of sandy soil under different freezing temperatures,examining the impact of water content and Alhagi sparsifolia root content,using typical sandy soil and the desert vegetation Alhagi sparsifolia root system from the northern slope of the Tianshan Mountains in Xinjiang as the research subject.Indoor unidirectional freezing experiments are conducted to simulate natural freeze-thaw conditions,and orthogonal experiments are used to determine the correlation and significance of various factors with the freeze-thaw deformation of sandy soil.The study analyzes the freeze-thaw deformation mechanism of sandy soil under varying water contents,freezing temperatures,and root contents,and proposes a fitting formula for the freeze-thaw deformation of sandy soil.The results show that the order of influence on the maximum deformation of freeze-thaw sandy soil is water content>freezing temperature>root content.The maximum deformation of freeze-thaw sandy soil is positively linearly correlated with water content,negatively linearly correlated with freezing temperature,and exhibits a quadratic function relationship with root content.Low water content bare sandy soil and root-containing sandy soil exhibit freeze shrinkage during the initial freezing stage and thaw expansion in the melting stage,while high water content bare sandy soil and root-containing sandy soil exhibit slow freeze expansion during the initial freezing stage and thaw settlement during the melting stage.A multi-factor regression model is developed based on this pattern,enabling accurate prediction of the maximum deformation of freeze-thaw sandy soil and offering guidance for the safety assessment of vegetation ecological slope protection in cold and arid regions.

关 键 词：冻融变形 含根量 冻结温度 含水率 砂土 

分 类 号：TU454[建筑科学—岩土工程]