基于粒径分布和薄膜水的土水特征曲线模型

朱世旺; 李双洋; 姜琪; 赵建沅; 周尚琪; 刘慧颖

doi:10.11988/ckyyb.20240089

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raybet体育在线院报 ›› 2025, Vol. 42 ›› Issue (5) : 200-207. DOI: 10.11988/ckyyb.20240089

岩土工程

基于粒径分布和薄膜水的土水特征曲线模型

朱世旺 ¹^,² ,
李双洋 ¹ ,
姜琪 ¹^,² ,
赵建沅 ¹^,² ,
周尚琪 ¹^,² ,
刘慧颖 ¹^,²

作者信息 +

Soil-Water Characteristic Curve Model Based on Particle Size Distribution and Pellicular Water

ZHU Shi-wang ¹^,² ,
LI Shuang-yang ¹ ,
JIANG Qi ¹^,² ,
ZHAO Jian-yuan ¹^,² ,
ZHOU Shang-qi ¹^,² ,
LIU Hui-ying ¹^,²

Author information +

文章历史 +

摘要

利用粒径分布曲线预测土水特征曲线(SWCC)的传统模型在计算含水量时通常需要将粒径分布曲线分段处理,且往往忽略了土壤颗粒表面的薄膜水含量,导致预测精度受到很大限制。为了解决以上问题,基于颗粒点对点接触假设,使用威布尔函数描述粒径分布曲线,通过杨拉普拉斯方程确定毛细水含水量,并考虑薄膜水含量的影响,建立一个基于粒径分布和薄膜水的土水特征曲线模型。然后选取非饱和土壤数据库(UNSODA)中26个土壤样品进行验证,并与AP模型和MV模型进行对比分析。结果表明,相较于AP模型和MV模型,新模型能更准确地预测土壤的土水特征曲线,且由于考虑了薄膜水含量,使新模型在高基质吸力段的含水量预测误差显著减小。

Abstract

Traditional models for predicting soil-water characteristic curve (SWCC) based on particle size distribution curve require segmentation of the curve when calculating water content and often neglect the pellicular water (also known as film water) content on the surface of soil particles. This significantly limits the prediction accuracy. To address these issues, this study assumes point-to-point contact between particles, employs the Weibull function to characterize the particle size distribution curve, determines the capillary water content using the Young - Laplace equation, and accounts for the influence of film water content. On this basis, a new SWCC model considering particle size distribution and film water is developed. Twenty-six soil samples from the Unsaturated Soil Database (UNSODA) are selected for validation and comparison with the AP and MV models. The results indicate that the proposed model based on particle size distribution and film water can predict the SWCC more accurately and significantly reduces the prediction error of water content in the high-matrix-suction section.

导出引用

朱世旺, 李双洋, 姜琪, 等. 基于粒径分布和薄膜水的土水特征曲线模型[J]. raybet体育在线院报. 2025, 42(5): 200-207 https://doi.org/10.11988/ckyyb.20240089

ZHU Shi-wang, LI Shuang-yang, JIANG Qi, et al. Soil-Water Characteristic Curve Model Based on Particle Size Distribution and Pellicular Water[J]. Journal of Changjiang River Scientific Research Institute. 2025, 42(5): 200-207 https://doi.org/10.11988/ckyyb.20240089

中图分类号： TU43 (土力学)

参考文献

列表( 原文顺序 | 文献年度倒序 | 文中引用次数倒序 ) 可视化分析

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摘要

选取陕西省子长县原状马兰黄土为研究对象，通过瞬态脱水和吸水(TWRI)试验方法，结合Van Genuchten(1980)土-水特征曲线模型和Mualem(1976)水力传导函数模型对土样的水-力作用参数进行反演计算，并绘制土-水特征曲线。试验结果表明，土样在不同脱湿和吸湿路径状态下的土-水特征曲线具有明显的回滞效应，其中，脱湿路径的进气值与饱和体积含水量分别为26 kPa和48%，不同干湿路径下与孔径分布有关的参数变化较小。为验证TWRI试验结果的正确性，针对同一个土样，采用2 Bar体积压力板仪对其基质吸力和体积含水量的关系进行稳态试验。对比以上2种方法的试验结果，可见瞬态脱水和吸水试验方法在低吸力范围内(0~300 kPa)的试验结果与压力板仪试验结果吻合较好，且具有试验周期短，测试吸力范围大的特点。

(GUO

Long

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Qing-bing

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Jing-e

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本文引用 [1] 摘要

A transient water release and imbibitions(TWRI) method together with Van Genuchten(1980) soil-water characteristic curve models and Mualem(1976) hydraulic conductivity function model was used for the inversion calculation of soil water-force parameters and the soil water characteristic curve(SWCC). The Malan loess at Zichang County in Shaanxi Province was selected as research object. Test results showed that the SWCC of soil samples under different drying and wetting states had apparent hysteresis effect. The air-entry value and saturated volumetric water content under drying state was 26 kPa and 48% respectively. Parameters related to pore size distribution changed slightly under different drying and wetting states. In order to verify the TWRI test results, steady-state test was carried out on the same soil sample using the volume 2 Bar pressure plate apparatus to study the relationship between their matrix suction and volumetric water content. By comparing the test results, it’s found that the test results of TWRI agrees well with that of pressure plate apparatus under low suction (0-300kPa). It has short test time and wide test range of matric suction.

[4]

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(ZHANG

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[5]

唐延贵, 吴礼舟. 粉质砂土的土-水特征及一维应力变形试验研究[J]. raybet体育在线院报, 2013, 30(10): 62-65.

摘要

浅层非饱和土的力学特性与其土-水特征密切相关,研究自重应力作用下土体的土-水特征曲线及一维应力变形对于边坡、基坑等工程的稳定性分析具有重要意义。采用应力相关的压力板仪对西南某地区的粉质砂土进行了干燥试验及k<sub>0</sub>固结试验。结果表明:在较低的竖向应力状态下,应力大小变化对粉质砂土的土-水特征曲线影响不大;在一定的净竖向应力状态下,粉质砂土的体积应变随吸力的增加呈线性增大;在一定的吸力状态下,粉质砂土的k<sub>0</sub>固结变形是非线弹性的,净竖向应力越大,土体的体积应变越大,孔隙比越小。

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本文引用 [1] 摘要

The mechanical properties of unsaturated soils in superficial layer is closely related with soilwater characteristics. Researching on the soilwater characteristics under geostatic stress and the deformation under 1-D stress state is important for stability analysis in slope and foundation pit excavation. To investigate the effect of 1-D stress and suction on the deformation of silty sand in southwest China, we carried out drying tests and consolidation tests by using a k 0 stress controllable pressure plate apparatus. Test results show that given low vertical stress state, the stress variation in a small range has little influence on soil-water characteristic curve. Under certain net vertical stress, the volumetric strain of silty sand increases linearly with the increase of suction. Under certain suction, the consolidation deformation under k0 stress is non-linearly elastic. As net vertical stress increases，the volumetric strain increases and the void ratio reduces.

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(QI

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https://doi.org/10.11988/ckyyb.20180917

本文引用 [1] 摘要

The water retention characteristics of Nanyang undisturbed weak expansive soil were tested using the osmotic technique and the vapor phase technique. The hydrating path of soil-water characteristic curve (SWCC) in the suction ranging from 0.01 to 309 MPa was gained and fitted according to a model proposed by Van Genuchten. Scanning Eelectron Microscope (SEM) and Mercury Intrusion Porosimetry (MIP) tests were conducted to analyse the influence of microstructure modification on SWCC. Results showed that during hydrating process, the volume content of micro-pore and macro-pore increased while that of fine-pore decreased. Changes in micro-pore and fine-pore resulted in the continuous absorption of water by soils with no inflection point on the SWCC. The increase of macro-pore mainly influences the boundary effect segment of SWCC, but such influence is slight.

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摘要

三峡水库蓄水后导致许多滑坡失稳，使人们认识到研究非饱和土性质的重要性。为研究巴东黄土坡滑坡土的非饱和性质，选取临江Ⅱ号崩滑堆积体的滑带土及滑体土作为试验对象，按其天然状态配置成重塑样，分别进行了土水特征试验及变水头渗透试验，得到了滑体土和滑带土在不同基质吸力条件下所对应的体积含水率和渗透系数；并对其土水特征试验曲线进行拟合， Fredlund-Xing方程拟合效果优于Gardner方程和指数衰减方程。同时发现土水特征试验在施加第一级基质吸力时很重要，这将影响试验曲线的形状。研究成果将对水库蓄水作用下的库岸滑坡稳定性评价有指导意义。

(CHANG

, WU

Yi-ping

, HE

Gao-feng

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