毛乌素沙漠南缘风积砂土的湿陷特性  

Collapse Characteristics of Aeolian Sand Soil in the South Edge of Mu Us Desert

作　　者：刘岩 邓亚虹[1] 黎志旭 慕焕东[2] 侯大勇 王治军 刘琳 LIU Yan;DENG Ya-hong;LI Zhi-xu;MU Huan-dong;HOU Da-yong;WANG Zhi-jun;LIU Lin(School of Geological Engineering and Surveying,Chang’an University,Xi’an 710054,China;Institute of Geotechnical Engineering,Xi’an University of Technology,Xi’an,710048,China;Changqing Engineering Design Co.,Ltd.,Xi’an 710021,China)

机构地区：[1]长安大学地质工程与测绘学院,西安710054 [2]西安理工大学岩土工程研究所,西安710048 [3]长庆工程设计有限公司,西安710021

出　　处：《长江科学院院报》2025年第3期141-147,共7页Journal of Changjiang River Scientific Research Institute

摘　　要：毛乌素沙漠地区部分风积砂土在遇水后其强度会迅速降低,发生较大的沉降变形,即具有一定的湿陷性,影响工程建筑的安全稳定,研究该地区风积砂土的湿陷特性具有重要的工程实际意义。以毛乌素沙漠南缘风积砂土为研究对象,开展了风积砂土原状样和重塑样的室内湿陷特性试验,通过单因素分析法研究了风积砂土湿陷特性的影响因素和影响规律。结果表明:①毛乌素沙漠南缘风积砂具有一定的湿陷性,湿陷程度为轻微湿陷;②毛乌素沙漠南缘风积砂土的湿陷性随干密度的增大迅速减小,随含水率的增大而减小,随黏粒含量的增多而增大,随试验垂直压力的增大呈先增大后减小的趋势;③毛乌素沙漠南缘风积砂土是否具有湿陷性的界限指标为干密度取1.5 g/cm^(3)、含水率取8%和相对密度取40.5%。Some aeolian sandy soils in the Mu Us Desert area are collapsible,affecting engineering structural stability due to large settlements induced by plunges in its strength when exposed to water.Investigating the collapsibility of aeolian sandy soil in the Mu Us Desert is of great practical significance.This study focuses on the aeolian sandy soil at the southern edge of the Mu Us Desert.We conducted indoor collapse tests on undisturbed and remolded aeolian sandy soil samples collected from the southern edge of the Mu Us Desert.Through single-factor analysis,we explored the influencing factors of the collapsibility of aeolian sandy soil and their influence patterns.Results indicate the following:1)The aeolian sand in the southern edge of the Mu Us Desert is slightly collapsible when exposed to water.2)The collapsibility decreases rapidly as the dry density increases,and declines with an increase in moisture content,but rises with an increase in clay content,and first increases and then decreases as the test vertical pressure increases.3)The boundary indicators for determining the collapsibility of the aeolian sand in the southern edge of the Mu Us Desert are a dry density of 1.5 g/cm^(3),a moisture content of 8%,and a relative density of 40.5%.

关 键 词：毛乌素沙漠 风积砂土 湿陷特性 影响因素 界限指标 

分 类 号：TU41[建筑科学—岩土工程]