不同含水率下黄土冻融循环对湿陷性影响探讨

谷琪; 王家鼎; 司冬冬; 许元珺; 陈朋; 李彬

doi:10.11779/CJGE201607004

不同含水率下黄土冻融循环对湿陷性影响探讨 English Version

西北大学地质学系大陆动力学国家重点实验室,陕西西安 710069

基金项目: 国家自然科学基金项目（41372269）；高等学校博士学科重点基金项目（20116101130001）；大陆动力学国家重点实验室重点基金项目

详细信息

作者简介:
谷琪(1990- ),陕西渭南人,硕士研究生,主要从事黄土湿陷、滑坡等灾害防治方面的研究。E-mail: 164349355@qq.com。

计量
- 文章访问数: 484
- HTML全文浏览量: 4
- PDF下载量: 413
出版历程
- 收稿日期: 2015-06-15
- 发布日期: 2016-07-24

Effect of freeze-thaw cycles on collapsibility of loess under different moisture contents

Department of Geology, State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China

摘要

摘要: 黄土通常可作为公路路基主要的填筑材料,湿陷性黄土经压实后,很大程度消除了湿陷性,能够满足路基整体强度和稳定性的要求,但在季节冻土区,黄土路基运营几年后仍发生大量的不均匀沉降、塌陷等病害。为分析冻融循环作用下各级含水率对黄土湿陷性的影响,采用室内试验的方法,对湿陷性黄土进行不同的冻融次数,探究其在冻融循环过程中变形及冻融循环后湿陷情况。实验结果表明：冻融循环之后的各级含水率重塑黄土仍具有二次湿陷性;冻融循环作用下高含水率的土体结构比低含水率的土体结构破坏的较早;干密度一定时,低含水率的土体冻融循环之后的净变形量越大,湿陷系数越小,冻融循环之后的净变形量越小,湿陷系数越大。
- 冻土 /
- 湿陷性 /
- 黄土 /
- 冻胀 /
- 融沉 /
- 冻融循环
Abstract: Loess is usually used as the main building materials for road subgrade. The collapsibility can be greatly eliminated after compaction of collapsible loess, and it can satisfy the requirements of whole intensity and stability of road subgrade. However, a lot of disasters such as differential settlement and collapse occur after the road subgrade of loess has been used for several years in seasonally frozen soil zone. In order to analyze the influence of various levels of moisture contents on collapsibility of loess under freeze-thaw cycles, deformation and collapsibility of collapsible loess are studied under different freeze-thaw cycles in laboratory. The test results indicate that the remolded loess at every level of moisture content still has secondary collapsibility after freeze-thaw cycles. The soil structure with higher moisture content is damaged earlier than that with lower moisture content under freeze-thaw cycles. When the dry density is certain, the larger the net amount of deformation with low soil moisture content after freeze-thaw cycles is, the smaller the collapsible coefficient is, and vice versa.
- permafrost /
- collapsibility /
- loess /
- frost heave /
- thaw collapse /
- freeze thaw cycle

HTML全文

参考文献(10)

[1]	高国瑞. 兰州黄土显微结构和湿陷机理的探讨[J]. 兰州大学学报, 1979(2): 123-134. (GAO Guo-rui. Study of the microstructures and collapse mechanism in loess soil from Lanzhou[J]. Journal of Lanzhou University, 1979(2): 123-134. (in Chinese))
[2]	王家鼎, 张倬元, 李保雄. 黄土自重湿陷变形的脉动液化机理[J]. 地理科学, 1999(3): 80-85. (WANG Jia-ding, ZHANG Zhuo-yuan, LI Bao-xiong. A mechanism in loess self-load collapse[J]. Scientia Geog Ra Phicasinica, 1999(3): 80-85. (in Chinese))
[3]	GANDAHL R. The damaging effects of frost action in roads, overview of types of damage and preventive measures, VTI report No.230[R]. Linkoping: Swedish Road and Traffic Research Institute, 1980: 418-423.
[4]	EDWIN J C, ANTHONY J G. Effect of freezing and thawing on the permeability and structure of soils[J]. Engineering Geology, 1979(13): 73-92.
[5]	齐吉琳, 马巍. 冻融作用对超固结土强度的影响[J]. 岩土工程学报, 2006, 28(12): 2082-2086. (QI Ji-lin, MA Wei. Influence of freezing-thawing on strength of overconsolidated soils[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(12): 2082-2086. (in Chinese))
[6]	宋春霞, 齐吉琳, 刘奉银. 冻融作用对兰州黄土力学性质的影响[J]. 岩土力学, 2008, 29(4): 1077, 1080+1086. (SONG CHUN Xia, QI Ji-lin, LIU Feng-yin. Influence of freeze-thaw on mechanical properties of Lanzhou loess[J]. Rock and Soil Mechanics, 2008, 29(4): 1077, 1080+1086. (in Chinese))
[7]	王泉, 马巍, 张泽, 等. 冻融循环对黄土二次湿陷特性的影响研究[J]. 冰川冻土, 2013, 35(2): 376-382. (WANG Quan, MA Wei, ZHANG Ze, et al. Research on the secondary collapse properties of loess under freeze-thaw cycle[J]. Journal of Glaciology and Geocryology, 2013, 35(2): 376-382. (in Chinese))
[8]	GANDAHL R. The Damaging effects of frost action in roads, overview of types of damage and preventive measures, VTI report No.230[R]. Linkoping: Swedish Road and Traffic Research Institute, 1980: 418-423.
[9]	高凌霞, 杨向军. 西安地区黄土湿陷性的影响因素[J]. 大连民族学院学报, 2003, 4(1): 66-69. (GAO Ling-xia, YANG Xiang-jun. Factors affecting the loess collapsibility in Xi'an[J]. Journal of Dalian Nationalities University, 2003, 4(1): 66-69. (in Chinese))
[10]	高国瑞. 黄土显微结构分类与湿陷性[J]. 中国科学, 1980, 11(12): 1203-1208, 1237-1240. (GAO Guo-rui. Loess microstructure classification and collapsibility[J]. Science China, 1980, 11(12): 1203-1208, 1237-1240. (in Chinese))

施引文献

资源附件(0)

计量

文章访问数: 484
HTML全文浏览量: 4
PDF下载量: 413
被引次数: 0

不同含水率下黄土冻融循环对湿陷性影响探讨 English Version

作者简介: 谷琪(1990- ),陕西渭南人,硕士研究生,主要从事黄土湿陷、滑坡等灾害防治方面的研究。E-mail: 164349355@qq.com。

计量

出版历程

Effect of freeze-thaw cycles on collapsibility of loess under different moisture contents

计量

出版历程

目录

作者简介:
谷琪(1990- ),陕西渭南人,硕士研究生,主要从事黄土湿陷、滑坡等灾害防治方面的研究。E-mail: 164349355@qq.com。