| 深厚黄土地基浸水湿陷变形及竖向土压力作用分析 |
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| 引用本文： | 屈宏录,刘德仁,孙英萍,闫炳舟,徐硕昌,张严.深厚黄土地基浸水湿陷变形及竖向土压力作用分析[J].水文地质工程地质,2022,49(4):157-164. |
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| 作者姓名： | 屈宏录 刘德仁 孙英萍 闫炳舟 徐硕昌 张严 |
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| 作者单位： | 1.中兰铁路客运专线有限公司, 甘肃 白银 730900 |
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| 基金项目： | 国家自然科学基金项目（41662017） |
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| 摘 要： | 黄土地基浸水后的湿陷变形对黄土地区的工程建设具有重大影响，但以往研究对深厚黄土地基土浸水过程的湿陷特性及其土压力变化规律研究不够充分。以中兰铁路兰州新区南站某场地为例，开展现场浸水试验，对深厚湿陷性黄土场地的地表位移及地基深层湿陷变形进行监测，同时埋设土压力盒，对浸水湿陷过程中地基土的竖向土压力的变化规律进行分析。研究...
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| 关 键 词： | 深厚黄土场地 现场浸水试验 地表变形监测 深层湿陷变形 竖向土压力 |
| 收稿时间： | 2021-09-07 |
Analysis of collapsible deformation and vertical soil pressure action of thick loess foundation |
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| Affiliation: | 1.Zhongwei to Lanzhou Railway Passenger Dedicated Line Co. Ltd., Baiyin, Gansu 730900, China2.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China3.Gansu Railway Construction Investment Group Co. Ltd., Lanzhou, Gansu 730030, China |
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| Abstract: | The collapsible deformation characteristics of loess foundation after flooding are of great significance in the engineering construction in loess regions. However, previous studies of the collapsible characteristics of deep loess foundation soil during the process of flooding and the variation law of soil pressure are not perfect. In this paper, a site in the South Station of Lanzhou New District of the Zhongwei-Lanzhou Railway is taken as an example and a field immersion test is carried out at the site to monitor the surface displacement and deep wet sink deformation of the foundation of the deep wet sink loess site. At the same time, soil pressure boxes are buried to analyze the change law of vertical soil pressure of the foundation soil during the immersion wet sink process. The research results show that (1) the maximum wet sink of the deep loess site is around 150 cm, and wet sink basically does not occur at the ground surface outside 10 m of the water immersion range. (2) According to the deep settlement test results, it can be seen that the loess foundation 0?15 m deep is the range of the strong wet sink soil layer, and the wet sink amount reaches about 120 cm, accounting for more than 80% of the wet sink amount of the whole site. Wet sink does not occur in the foundation soil 24 m deep and it is a non-self-weight wet sink soil layer. (3) According to the soil pressure monitoring analysis, it is obtained that the soil structure within 15 m in depth is completely collapsed after water immersion, and the soil pressure obtained from the test is the self-weight pressure of the overlying soil. A certain amount of wet subsidence after water immersion occurs at a depth of 15 m or less, but the soil structure is not completely destroyed, and it still has a certain support effect on the overlying self-weight load. The results of this study can provide some technical references for the later construction of the Zhongwei-Lanzhou Railway and the Lanzhou New District. |
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