| 李兴文,韩进,王研,魏宇航,马良,王扬,彭小华.基于微观尺度的延安革命旧址黄土湿陷特性研究[J].矿产勘查,2025,16(4):705-714 |
| 基于微观尺度的延安革命旧址黄土湿陷特性研究 |
| Study on loess collapsible characteristics from Yan’an revolutionary sites based on the microscale |
| 投稿时间：2023-12-28 |
| DOI：10.20008/j.kckc.202504003 |
| 中文关键词: 湿陷性黄土 微观结构 孔隙 延安革命旧址 |
| 英文关键词: collapsible loess microstructure pore Yan’an revolutionary sites |
| 基金项目:本文受陕西省公益性地质调查项目(202203)、延安市科技计划项目(SL2022SLGYGG-005)和榆林市科技计划项目(CXY-2021-123)联合资助。 |
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| 中文摘要: |
| 延安地处黄土高原丘陵沟壑区，湿陷性黄土分布广泛，对大多数以黄土窑洞为主体建筑物的革命旧址有着不利影响。为了探讨延安革命旧址湿陷性黄土的微观结构特征及其影响因素，本文选取 5处革命旧址的原状黄土为研究对象，分别开展室内试验及扫描电镜试验，以测定其基本性质，并研究不同试验条件下黄土湿陷前后的微观结构变化及孔隙分布特征。研究结果表明:延安革命旧址原状黄土属于低含水率土，粒度分布以粉粒为主，颗粒形态以棱角状和磨圆状居多，接触方式包括点接触和面接触两类；随着压力和压实度的增大，黄土中的颗粒接触更加紧密，孔隙逐渐变小，微、小孔隙占据主导，大、中孔隙逐渐消失；相比压力和压实度，含水率对孔隙结构的影响较为微弱，随着含水率的升高，黄土中的孔隙形态逐步趋于圆形小孔，微、小孔隙增多。研究成果可为延安革命旧址湿陷性黄土的工程治理提供参考。 |
| 英文摘要: |
| Yan’an City is located in the hinterland of Chinese Loess Plateau, and the collapsible loess iswidely distributed and has a negative effect on most of the revolutionary sites with loess cave dwellings as the mainbuildings. The purpose of this paper is to explore the microstructure characteristics and their influencing factors of collapsible loess at the Yan’an revolutionary sites, and to enrich the research content of regional collapsible loess.In this paper, the undisturbed loess samples collected from five revolutionary sites in Yan’an City are studiedthrough laboratory test, scanning electron microscope test and professional image processing software, and thechanges of microstructure and pore distribution of loess samples before and after collapsibility test are analyzedfrom the microscale perspective. The results show that the undisturbed loess samples can be attributed to the soilwith low water content, the grain size distribution is mainly composed of silt, and the grain shape is mostly angularand rounded. The contact modes include point contact and surface cementation. With the increase of pressure anddegree of compaction, the particles in loess contact more closely and the pores gradually become smaller, and themicro and small pores dominate while the large and medium pores gradually disappear. Compared with the pressureand degree of compaction, the influence of water content on the pore structure is relatively weak. With the increaseof water content, the pore shape of loess gradually tends to be rounded small pores, and the number of micro andsmall pores increases. The research results can provide a reference for the engineering treatment of collapsible loessat the Yan’an revolutionary sites. |
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