[1]郭从洁,时 伟,杨忠年,等.冻融作用下初始含水率对膨胀土边坡稳定性的影响研究[J].西安建筑科技大学学报(自然科学版),2021,53(01):69-79.[doi:10.15986/j.1006-7930.2021.01.010]
　GUO Congjie,SHI Wei,YANG Zhongnian,et al.Research on the influence of initial moisture contents on the stability of the expansive soil slope under freezethaw cycles[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2021,53(01):69-79.[doi:10.15986/j.1006-7930.2021.01.010]
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冻融作用下初始含水率对膨胀土边坡稳定性的影响研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
53
期数:
2021年01期
页码:
69-79
栏目:
出版日期:
2021-02-28

文章信息/Info

Title:
Research on the influence of initial moisture contents on the stability of the expansive soil slope under freezethaw cycles
文章编号:
1006-7930(2021)01-0069-11
作者:
郭从洁1; 时 伟1; 杨忠年1; 等
(1.青岛理工大学 土木工程学院,山东 青岛 266033; 2. 哈尔滨工业大学 土木工程学院,黑龙江 哈尔滨 150001)
Author(s):
GUO Congjie1;  SHI Wei1;  YANG Zhongnian1;  et al
(1.School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China; 2.School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China)
关键词:
冻融循环;  膨胀土;  边坡稳定性;  初始含水率
Keywords:
freeze-thaw cycles;  expansive soil;  slope stability;  initial moisture content rate
分类号:
TU443
DOI:
10.15986/j.1006-7930.2021.01.010
文献标志码:
A
摘要:
随着全球气候变暖,季节性冻土区面积不断增大,边坡在冻融循环作用下,极易发生失稳破坏; 由于膨胀土是一种特殊性的土,膨胀土边坡更易失稳.通过建立不同初始含水率的膨胀土边坡模型,对多次冻融循环下坡体温度、含水率、土压力以及位移进行实时监测,研究了冻融循环下,不同初始含水率膨胀土边坡坡体各指标的变化规律,进而探究初始含水率对膨胀土边坡稳定性的影响.研究发现:在多次冻融循环过程中,膨胀土边坡各监测数据均呈周期性变化,首次冻融对边坡土体的影响最大,并且在冻融过程中,边坡呈现单向冻结,双向融化现象,且融化速率大于冻结速率; 边坡初始含水率越高,到达冻结稳定所需要的时间越长,土压力变化幅度越大,冻胀率也越大; 此外,不同初始含水率边坡土体存在“冻胀融缩”或“冻缩融胀”两种现象,但边坡整体均向临空面发展.本研究成果对进一步探究季冻区膨胀土边坡稳定性以及失稳机制具有重要意义,可为季冻区膨胀土边坡稳定性的研究提供更好的理论基础及科学依据.
Abstract:
With global warming, the area of seasonal permafrost is increasing, and the slope is highly susceptible to destabilization under the effect of freeze-thaw cycles. As a special soil, expansive soil slope is more prone to destabilization. The slope temperature, moisture content, soil pressure, and displacement are monitored in real-time under multiple freeze-thaw cycles by modeling expansive soil slopes with different initial moisture contents. The influence of initial moisture content on the stability of slopes of expansive soil is investigated by examining the variation of parameters of slopes of expansive soils with different initial moisture contents under freeze-thaw cycles. Results show that the monitoring data of expansive soil slope show periodic changes in the process of multiple freeze-thaw cycles,and first freeze-thaw has the greatest impact on slope soil. Moreover, the slope shows unidirectional freezing and bidirectional thawing, and the thawing rate is greater than the freezing rate in the freeze-thaw process. The higher the initial moisture content of the slope, the longer the time is needed to reach the freezing stability, the greater the variation range of soil pressure, and the greater the frost heave rate. In addition, there are two phenomena of "frost shrinking and thaw expanding" or "frost expanding and thaw shrinking" in the soil body of the slope with different initial moisture content, but the slope as a whole develops towards the freeing surface. Research results may provide a theoretical and scientific basis for the study of the slope stability of expansive soil in the seasonally frozen soil zone.

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备注/Memo

备注/Memo:
收稿日期:2020-07-23 修改稿日期:2021-01-12
基金项目:冻土工程国家重点实验室开放基金资助项目(SKLFSE201601); 山东省泰山学者专项基金资助项目(2015-212); 国家重大科研仪器开发基金资助项目(41627801)
第一作者:郭从洁(1994-),女,硕士生,研究方向为岩土工程. E-mail:st126guo@126.com
通信作者:杨忠年(1985-),男,博士,讲师,主要从事岩土工程和隧道工程方面的教学和科研工作. E-mail:yzhnqd@qut.edu.cn
更新日期/Last Update: 2021-02-28