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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年06期

页码:

188-198

栏目:

岩土工程

出版日期:

2025-11-25

文章信息/Info

Title:

Centrifugal test study on freeze-thaw characteristics of high-steep fill slope with gravel soil

文章编号:

1673-2049(2025)06-0188-11

作者:

翁效林,党博涵,杨连祥,胡继波

(长安大学 公路学院,陕西 西安 710064)

Author(s):

WENG Xiaolin, DANG Bohan, YANG Lianxiang, HU Jibo

(School of Highway, Chang'an University, Xi'an 710064, Shannxi, China)

关键词:

冻融作用;  高陡填方边坡;  土石混合体填料;  离心试验

Keywords:

freeze-thaw cycle;  high-steep fill slope;  soil-rock mixture filler;  centrifugal test

分类号:

TU443

DOI:

10.19815/j.jace.2024.01077

文献标志码:

A

摘要:

以涞源国家跳台滑雪训练基地项目为背景,研究冻融作用对于碎石土高陡填方边坡的影响。采用离心模型试验方法分析了冻融作用下边坡不同位置的温度、孔隙水压力以及坡顶竖向位移等参数的变化规律,研究了冻融作用下碎石土高陡填方边坡的响应,并讨论了碎石土填料级配对边坡物理性质的影响,进而得到冻融作用下碎石土高陡填方边坡填料的最优级配。结果表明:不同埋深处的碎石土温度变化趋势基本一致,但温度变化速率随埋深增大而降低,坡面处的冻结速率和融沉速率显著高于坡脚与坡顶; 冻融过程中碎石土的温度、孔隙水压力均表现出“快速下降-缓慢下降-快速升高-缓慢升高”的变化规律,温度变化最大处位于坡面,孔隙水压力变化最复杂处位于坡脚; 坡顶竖向位移呈现“快速冻胀-缓慢冻胀-快速融沉-缓慢融沉”的变化规律,最大竖向位移发生在坡顶中线附近; 碎石土填料中的粗颗粒含量对冻融过程中孔隙水压力的变化有显著影响,粗颗粒含量越多,孔隙水压力变化幅度越小; 适当减少碎石土填料中细颗粒成分的占比,增大中粗颗粒的含量,使细、中、粗颗粒含量比约为6:3:1时,可提高冻融作用下坡脚处的最低温度,降低坡脚处的初始孔隙水压力,减少坡顶处的冻胀融沉和边坡整体变形。

Abstract:

Taking the national ski jumping training base project in Laiyuan as the background, the effect of freeze-thaw cycle on high-steep fill slope with gravel soil was studied. Using centrifugal model tests, variation patterns of parameters such as temperature, pore water pressure, and vertical displacement at the slope crest under freeze-thaw cycle were analyzed. The response of high-steep fill slope with gravel soil to freeze-thaw cycle was examined, and the influence of gravel soil gradation on the physical properties of the slope was discussed to determine the optimal gradation of high-steep fill slope with gravel soil under freeze-thaw cycle. The results show that the temperature variation trends at different burial depths are generally consistent, but the rate of temperature change decreases with the increase burial depth. The freezing and thaw settlement rates on the slope surface are significantly higher than those at the slope toe and crest. During the freeze-thaw process, both the temperature and pore water pressure of the gravel soil exhibit a “rapid decline-slow decline-rapid rise-slow rise” pattern, with the greatest temperature variation occurring on the slope surface and the most complex pore water pressure variation at the slope toe. The vertical displacement at the slope crest shows a “rapid frost heave-slow frost heave-rapid thaw settlement-slow thaw settlement” trend, with the maximum vertical displacement occurring near the centerline of the slope crest. The coarse particle content in the gravel soil fill has a significant impact on the variation of pore water pressure during the freeze-thaw process. The higher the coarse particle content, the smaller the variation in pore water pressure. When the ratio of fine, medium and coarse particles is about 6:3:1, by appropriately reducing the proportion of fine particles and increasing the content of medium and coarse particles, the minimum temperature at the slope toe under freeze-thaw cycle can be increased, the initial pore water pressure at the slope toe can be reduced, and frost heave and thaw settlement at the slope crest as well as overall slope deformation can be minimized.

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备注/Memo

备注/Memo:

收稿日期:2024-01-03
基金项目:国家重点研发计划项目(2021YFB2600601,2021YFB2600600)
作者简介:翁效林(1980-),男,工学博士,教授,博士生导师,E-mail:wengxl2000@126.com。
碎石土高陡填方边坡冻融特性离心试验研究

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更新日期/Last Update: 2025-11-25