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力学与实践 ›› 2019, Vol. 41 ›› Issue (1): 37-42.doi: 10.6052/1000-0879-18-313

• 应用研究 • 上一篇    下一篇

人工冻结黏土承载力模型试验及数值模拟分析1)

姚兆明2),†,*, 刘爽*, 商玉娇*   

  1. *安徽理工大学土木建筑学院,安徽淮南 232001;
    煤矿深井建设技术国家工程实验室,安徽淮南 232001;
    **济南工程职业技术学院,济南 250000
  • 收稿日期:2018-08-13 出版日期:2019-02-20
  • 通讯作者: 2)姚兆明, 教授, 主要从事岩土本构模型及数值分析研究。 E-mail: zhmyaoaust@126.com
  • 基金资助:
    1)安徽省教育厅资助项目(2016jyxm0274)

MODEL TEST AND NUMERICAL SIMULATION OF BEARING CAPACITY OF ARTIFICIAL FROZEN CLAY1)

YAO Zhaoming2),†,*, LIU Shuang*, SHANG Yujiao**   

  1. *School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China;
    National Engineering Laboratory of Deep Well ConstructionTechnology in Coal Mine, Huainan 232001, Anhui, China;
    **Jinan Engineering Vocational Technical College, Jinan 250000, China
  • Received:2018-08-13 Online:2019-02-20

摘要: 在天然冻土地区进行工程建设需研究冻土地基承载力。在人工冻结黏土蠕变试验的基础上建立广义开尔文模型,通过改造人工冻土大型冻结试验平台,进行人工冻结黏土地基承载力试验,发现载荷-沉降曲线可以分为3个阶段,基础呈局部剪切破坏。在ANSYS中将考虑相变的温度场转化为温度载荷施加在三维实体模型上,并将广义开尔文模型应用于软件中,采用增量加载方式分级加载。对比数值模拟与模型试验结果,发现地基载荷-沉降曲线规律一致,极限承载力大小基本相等,基础破坏模式相同。结果表明ANSYS软件可以分析复杂边界、初始条件下冻土材料的性质, 且能得到不同载荷下冻土材料的应力、位移、塑性区发展状况。

关键词: 人工冻结黏土, 模型试验, 数值模拟, 承载力, 温度场

Abstract: This paper studies the bearing capacity of the frozen soil foundation of engineering constructions in permafrost areas. Based on the creep tests of the artificial frozen clay, a generalized Kelvin model is established. The large-scale artificial frozen soil freezing test platform is used to test the bearing capacity of the artificial frozen clay. It is found that the load-settlement curve could be divided into three stages, and the foundation sees a local shear failure. For the use of the ANSYS, the temperature field with consideration of the phase transition is transformed into a temperature load and a three-dimensional solid model and a generalized Kelvin model are built, with a step loading. By comparing the numerical simulation results and the model test results, it is found that the load-settlement curve is consistent, the ultimate bearing capacity is basically the same, and the basic failure mode is the local shear failure. The results show that the ANSYS could analyze the properties of the frozen soil under complex boundary and initial conditions, and the stress and displacement of the frozen soil under different loads could be obtained

Key words: artificial frozen clay, model test, numerical simulation, bearing capacity, temperature field

中图分类号: 

  • TU470