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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。
Seasonal permafrost slope support structure is often affected by the role of freeze-thaw cycles and the destruction of slope support structure caused great security risks. Combined with a practical project in Lanzhou, a finite element model of soil nailing slope supporting structure in seasonal permafrost area was established by using the heat-fluid-solid coupling analysis module of large non-linear finite element software ADINA. Swelling, melting Shen constitutive model, and the actual test results verify the effectiveness of the program. Then, the secondary development software was used to analyze the response characteristics and regularity of soil nailing slope supporting structure under the action of freeze-thaw cycle. The analysis results show that under the action of freeze-thaw cycles, the axial force near the nail head of each layer increases most and the axial increment along the soil nail decreases gradually. The relative increment of axial force increases along the slope height. The horizontal displacement, The amount of land subsidence at the top of a hill suddenly increased due to the increase of moisture content due to thawing of frozen soil. The conclusions of the study can provide references for the design and construction of slope support in seasonal frozen soil region.