季节性冻土区土钉边坡支护结构冻融反应分析

doi:10.16285/j.rsm.2017.02.034

›› 2017, Vol. 38 ›› Issue (2): 574-582.doi: 10.16285/j.rsm.2017.02.034

季节性冻土区土钉边坡支护结构冻融反应分析

张媛^{1, 2}，董建华^{1, 2}，董旭光^{1, 2}，王永胜^{1, 2}

1. 兰州理工大学甘肃省土木工程防灾减灾重点实验室，甘肃兰州 730050； 2. 兰州理工大学西部土木工程防灾减灾教育部工程研究中心，甘肃兰州 730050

收稿日期:2015-02-03 出版日期:2017-02-11 发布日期:2018-06-05
通讯作者: 董建华，男，1980年生，博士后，教授，博导，从事柔性边坡支挡结构静动力分析与设计研究。E-mail: djhua512@163.com E-mail:781541570@qq.com
作者简介:张媛，女，1988年生，硕士生，主要从事柔性支挡结构的分析与设计研究。
基金资助:
国家自然科学基金资助项目（No.51108221，No.51268037）；甘肃省杰出青年基金项目（No.145RJDA330）；陇原青年创新人才扶持计划（No.LYRC2014002）；兰州理工大学红柳杰青基金项目（No. J201403）；高等学校博士学科点专项科研基金（No. 20116201120002）；甘肃省高校基本科研业务费专项项目（No.1204ZTC058）；国家留学基金资助项目（No.2011862535）。

Analysis of freezing and thawing of slope improved by soil nailing structure in seasonal frozen soil region

ZHANG Yuan^{1, 2}, DONG Jian-hua^{1, 2}, DONG Xu-guang^{1, 2}, WANG Yong-sheng^{1, 2}

1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China

Received:2015-02-03 Online:2017-02-11 Published:2018-06-05
Supported by:
This work was supported by the National Natural Science Foundation of China(51108221, 51268037), the Science Foundation for Distinguished Young Scholars of Gansu Province (145RJDA330), the Longyuan Youth Innovative talents Support Funds(LYRC2014002), the Foundation for Philippine Distinguished Young Scholars of Lanzhou University of Technology(J201403), the Research Fund for the Doctoral Program of Education of China (20116201120002), the Operation Expenses for Universities' Basic Scientific Research of Gansu Authorities(1204ZTC058) and the National Scholarship Foundation of China (2011862535).

摘要/Abstract

摘要： 季节性冻土区边坡支护结构往往受冻融循环作用而发生破坏，对边坡支护结构造成很大的安全隐患。结合兰州地区某实际工程，应用大型非线性有限元软件ADINA中的热-流体-固体耦合分析模块建立了季节性冻土区土钉边坡支护结构的有限元模型，开发了土体在冻胀、融沉时的本构模型，并用实测结果考证了程序的有效性。然后采用二次开发的软件分析土钉边坡支护结构在冻融循环作用下的反应特性及规律。分析结果表明：在冻融循环作用下，每层土钉钉头附近轴力值增加最大，沿土钉轴向增加值逐渐减小；轴力相对增量沿坡高逐渐增大；水平位移、坡顶地面沉降量均因冻土融化使得含水率增加而突增。研究结论可为季节性冻土地区边坡支护的设计和施工提供参考。

关键词: 季节性冻土, 边坡, 土钉支护结构, 冻融循环, 数值模拟, 冻融反应

Abstract: Freezing-thawing cycle in seasonal frozen soil region frequently damages the slope protected by soil nailing structure and threatens the slope retaining structure. In this paper, a finite element model was established using the thermal-fluid-structural coupling module in the nonlinear finite element software ADINA as case study of a project in Lanzhou. A constitutive model was developed to solve freeze-heave and thaw-subside. The program was verified by measured results. The structural characteristic response of soil nailing structure under freezing-thawing cycles was analyzed by the software secondary development. The results show that the increment of axial force of soil nail in each layer reaches a maximum at the nail head and decreases gradually along the axial direction under freezing-thawing cycles. The relative increment of axial force increases with the slope height. The horizontal displacement and ground settlement increase due to melted frozen soil. These conclusions provide significant references for design and construction of slope retaining structures in seasonal frozen soil region.

Key words: seasonal frozen soil, slope, soil nailing structure, freezing-thawing cycles, numerical simulation, freezing and thawing response

中图分类号:

TU 445

张媛，董建华，董旭光，王永胜, . 季节性冻土区土钉边坡支护结构冻融反应分析[J]. , 2017, 38(2): 574-582.

ZHANG Yuan, DONG Jian-hua, DONG Xu-guang, WANG Yong-sheng, . Analysis of freezing and thawing of slope improved by soil nailing structure in seasonal frozen soil region[J]. , 2017, 38(2): 574-582.

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季节性冻土区土钉边坡支护结构冻融反应分析

Analysis of freezing and thawing of slope improved by soil nailing structure in seasonal frozen soil region

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