基于原位双环、试坑浸水试验和数值模拟反演的Q3黄土饱和渗透系数对比研究

doi:10.16285/j.rsm.2021.2086

岩土力学 ›› 2022, Vol. 43 ›› Issue (11): 2941-2951.doi: 10.16285/j.rsm.2021.2086

基于原位双环、试坑浸水试验和数值模拟反演的Q3黄土饱和渗透系数对比研究

蒋小虎¹，黄跃廷²，胡海军¹，陈铄¹，陈锐³，王崇华²，汪慧²，康顺祥¹

1. 西北农林科技大学水利与建筑工程学院，陕西杨凌 712100；2. 机械工业勘察设计研究院有限公司，陕西西安 710043； 3. 哈尔滨工业大学（深圳）土木与环境工程学院，广东深圳 518055

收稿日期:2021-12-10 修回日期:2022-07-13 出版日期:2022-11-11 发布日期:2022-11-29
通讯作者: 胡海军，男，1982年生，博士，副教授，硕士生导师，主要从事结构性黄土的宏微观特性、离散元方面的研究。E-mail: hu.hai-jun@163.com E-mail:jxh1107243121 @nwafu.edu.cn
作者简介:蒋小虎，男，1995年生，硕士研究生，主要从事黄土渗透和力学特性方面的研究工作。
基金资助:
陕西省自然科学基础研究计划项目（No. 2021JM-107）；国家自然科学基金项目（No. 51409220）；西北农林科技大学基本科研业务费专项项目（No. 2014YB049）

Comparison of saturated permeability coefficient of Q3 loess based on in-situ double ring test, field water immersion test and numerical simulation inversion

JIANG Xiao-hu¹, HUANG Yue-ting², HU Hai-jun¹, CHEN Suo¹, CHEN Rui³, WANG Chong-hua², WANG Hui², KANG Shun-xiang¹

1. College of Water Resources and Architectural Engi neering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2. China Jikan Research Institute of Engineering Investigation and Design, Co., Ltd, Xi'an, Shaanxi 710043, China; 3. School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, China

Received:2021-12-10 Revised:2022-07-13 Online:2022-11-11 Published:2022-11-29
Supported by:
This work was supported by the Natural Science Foundation of Shaanxi Province (2021JM-107), the National Natural Science Foundation of China (51409220) and the Scientific Research Foundation of Northwest A&F University(2014YB049).

摘要/Abstract

摘要： 为准确获取原状Q3黄土的竖向和水平饱和渗透系数，进行了原位、室内试验测试以及数值模拟反演，并应用大型试坑浸水试验检验了所获饱和渗透系数的可靠性。进行了不同内径尺寸的原位双环入渗试验，获取了竖向饱和渗透系数，并应用室内试验测试了竖向和水平饱和渗透系数以及持水曲线；应用COMSOL软件对双环入渗试验进行数值模拟，检验了所测饱和渗透系数的可靠性，利用正交试验获得了最优的竖向和水平饱和渗透系数取值，并利用反演结果对试坑进行数值模拟，将其水分入渗情况与实测值对比。研究结果表明：在现场进行双环入渗试验时选取较大内径的双环获得的竖向饱和渗透系数更为合理。针对双环入渗试验，数值模拟反演所得最优饱和渗透系数在竖向上接近于原位试验所得竖向饱和渗透系数、水平向上接近室内所测水平向饱和渗透系数，竖向饱和渗透系数比水平向饱和渗透系数更加显著地影响水分入渗过程。通过对大型试坑水分入渗情况的验证，检验了反演所得最优饱和渗透系数的可靠性。

关键词: 黄土, 饱和渗透系数, 浸水试验, 双环入渗试验, 数值模拟, 水分入渗

Abstract: In order to accurately obtain the vertical and horizontal saturated permeability coefficient of undisturbed Q3 loess, in-situ tests, laboratory tests and numerical tests were carried out, and the reliability of the saturated permeability coefficient measurement was verified by large-scale test pit immersion test. Firstly, the in-situ double ring infiltration tests with different inner diameter sizes were carried out to obtain vertical saturation coefficients and indoor tests were applied to test vertical and horizontal saturation coefficients and water holding curve. Then, COMSOL software was used to simulate the double-ring infiltration tests, the optimal values of vertical and horizontal saturated permeability coefficients were obtained by orthogonal tests, and the inversion results were used to simulate the test pit immersion test, and the simulated water infiltration was compared with the measured values. The results show that the saturated permeability coefficient obtained by selecting the double-ring with larger inner diameter is more rational in the field double-ring infiltration test. For the double-ring infiltration test, the optimal vertical saturated permeability coefficient obtained by numerical simulation inversion is close to the vertical saturated permeability coefficient obtained by in-situ test in the vertical direction, and close to the horizontal saturated permeability coefficient measured in the laboratory in the horizontal direction. The vertical saturated permeability coefficient affects the water infiltration process more significantly than the horizontal saturated permeability coefficient. The reliability of the optimal saturation permeability coefficient obtained from the inversion was tested by verifying the water infiltration in a large test pit.

Key words: loess, saturated permeability coefficient, immersion test, double-ring infiltration test, numerical simulation, water infiltration

中图分类号:

TU 444

蒋小虎, 黄跃廷, 胡海军, 陈铄, 陈锐, 王崇华, 汪慧, 康顺祥, . 基于原位双环、试坑浸水试验和数值模拟反演的Q3黄土饱和渗透系数对比研究[J]. 岩土力学, 2022, 43(11): 2941-2951.

JIANG Xiao-hu, HUANG Yue-ting, HU Hai-jun, CHEN Suo, CHEN Rui, WANG Chong-hua, WANG Hui, KANG Shun-xiang, . Comparison of saturated permeability coefficient of Q3 loess based on in-situ double ring test, field water immersion test and numerical simulation inversion[J]. Rock and Soil Mechanics, 2022, 43(11): 2941-2951.

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基于原位双环、试坑浸水试验和数值模拟反演的Q3黄土饱和渗透系数对比研究

Comparison of saturated permeability coefficient of Q3 loess based on in-situ double ring test, field water immersion test and numerical simulation inversion

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