季节性冻土区土钉边坡支护结构冻融反应分析

发布时间：2018-02-11 01:02

本文关键词： 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　出处：《岩土力学》2017年02期 　论文类型：期刊论文

【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。
[Abstract]:The slope support structure in seasonal frozen soil region is often damaged by freeze-thaw cycle, which causes a great potential safety hazard to the slope support structure. The finite element model of soil nailing slope support structure in seasonal frozen soil region is established by using the thermal-fluid-solid coupling analysis module of large-scale nonlinear finite element software ADINA, and the constitutive model of soil is developed during frost heave and thawing settlement. The validity of the program is verified by the measured results. Then, the response characteristics and rules of soil nailing slope support structure under the action of freeze-thaw cycle are analyzed by using the software developed twice. The results show that: under the action of freeze-thaw cycle, The axial force near the head of each layer of soil nailing increases maximum, and decreases gradually along the axial direction of the soil nailing, and the relative increment of axial force increases gradually along the slope height. The surface subsidence of the slope is increased by the thawing of the frozen soil, which can provide reference for the design and construction of the slope support in the seasonal frozen soil area.
【作者单位】：兰州理工大学甘肃省土木工程防灾减灾重点实验室;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;
【基金】：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)~~
【分类号】：TU753

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