浸水入渗条件下压实黄土水−气运移规律试验研究

doi:10.16285/j.rsm.2021.0651

岩土力学 ›› 2021, Vol. 42 ›› Issue (12): 3260-3270.doi: 10.16285/j.rsm.2021.0651

浸水入渗条件下压实黄土水−气运移规律试验研究

刘德仁¹，徐硕昌¹，肖洋³，王旭^{1, 2}，李建东¹，张严¹

1. 兰州交通大学土木工程学院，甘肃兰州 730070；2. 兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室，甘肃兰州 730070； 3. 佛山市铁路投资建设有限公司，广东佛山 528000

收稿日期:2021-04-29 修回日期:2021-06-28 出版日期:2021-12-13 发布日期:2021-12-14
作者简介:刘德仁，男，1978年生，博士，副教授，主要从事岩土工程及特殊土与寒区工程相关的教学与研究工作
基金资助:
国家自然科学基金（No.41662017）

Experimental study on the law of water-air migration in compacted loess under the condition of immersion infiltration

LIU De-ren¹, XU Shuo-chang¹, XIAO Yang³, WANG Xu^{1, 2}, LI Jian-dong¹, ZHANG Yan¹

1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China; 2. National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China; 3. Foshan Railway Investment Construction Group Co., Ltd., Foshan, Guangdong 528000, China

Received:2021-04-29 Revised:2021-06-28 Online:2021-12-13 Published:2021-12-14
Supported by:
This work was supported by the National Natural Science Foundation of China(41662017).

摘要/Abstract

摘要： 压实黄土的干密度和初始含水率对水分入渗过程有显著的影响。以兰州黄土为研究对象，在室内填筑模型开展浸水入渗试验，测试入渗过程中不同深度处的土体体积含水率和孔隙气压力，分析水分入渗时湿润锋和孔隙气压力的变化规律。试验结果表明：土体压实度增大时，入渗率减小，湿润锋面到达测点时间延长，压实度从0.83增大到0.93，不同深度入渗率降幅最高可达21.7%。初始含水率增加时，孔隙水连通性增强，入渗率增大。与初始含水率相比，干密度对水分入渗的影响更为显著；水分入渗过程中孔隙气压力变化呈现连续状态，可以划分为快速变化和缓慢变化两个阶段，浸水过程中最大峰值气压和稳定气压与土体初始含水率和干密度呈正相关关系；入渗率随入渗深度增加而大幅降低，且干密度越大或体积含水率越低，入渗率越小；考虑干密度和初始含水率对孔隙气压力的影响，对Green-Ampt模型进行修正，将入渗深度实测值与计算值进行对比分析，发现修正模型计算值与试验实测值吻合更好。

关键词: 非饱和黄土, 浸水入渗, 湿润锋面, 水?气运移规律, 模型试验

Abstract: The dry density and initial moisture content of compacted loess significantly affect the process of water infiltration. Taking Lanzhou Loess as the research object, the immersion infiltration tests were carried out through filling the test model in indoor. The volumetric water content and pore air pressure of the soil at different depths in the process of infiltration were tested. Then variation laws of wetting front and pore air pressure during water infiltration were analyzed. The test results suggest that when the degree of soil compaction increases, the water infiltration rate decreases, and the time of the wetting front reaching the measuring point is prolonged. The degree of soil compaction increases from 0.83 to 0.93, and the infiltration rate at different depths decreases as high as 21.7%. When the initial water content increases, the pore water connectivity is enhanced and the water infiltration rate increases. The effect of dry density on water infiltration is more significant compared with the initial moisture content. The pore air pressure changes continuously during water infiltration, and the process can be divided into two stages: rapid change and slow change. In the process of water infiltration, the maximum peak air pressure and stable air pressure are positively correlated with the initial moisture content and dry density of soil. However, the infiltration rate decreases greatly with the increase of the infiltration depth, and the bigger the dry density is or the lower the volumetric water content is, the smaller the infiltration rate is. Considering the influence of dry density and initial water content on pore air pressure, the Green-Ampt model was modified. Finally, through comparison and analysis of the measured values with the calculated values of the infiltration depth, it is found that the calculated value of the modified model is in good agreement with the measured value of the test.

Key words: unsaturated loess, immersion infiltration, wetting front, law of water-air migration, model test

中图分类号:

TU431

刘德仁, 徐硕昌, 肖洋, 王旭, 李建东, 张严, . 浸水入渗条件下压实黄土水−气运移规律试验研究[J]. 岩土力学, 2021, 42(12): 3260-3270.

LIU De-ren, XU Shuo-chang, XIAO Yang, WANG Xu, LI Jian-dong, ZHANG Yan, . Experimental study on the law of water-air migration in compacted loess under the condition of immersion infiltration[J]. Rock and Soil Mechanics, 2021, 42(12): 3260-3270.

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浸水入渗条件下压实黄土水−气运移规律试验研究

Experimental study on the law of water-air migration in compacted loess under the condition of immersion infiltration

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