不同条件下土壤压力沉陷关系有限元分析
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摘要
基于有限元理论研究了加载速率和载荷板尺寸对土壤压力沉陷关系和经典土壤压力沉陷模型参数拟合的影响,加载速率和载荷板尺寸均对土壤压力沉陷关系产生影响。提高加载速率会提高同一沉陷量时的土壤承载力,载荷板尺寸的增加会降低单位面积的土壤承载力。采用最小二乘法对经典土壤压力沉陷模型参数进行了拟合,发现不同加载速率和载荷板尺寸下,模型参数并非常数,单一条件对模型参数的影响规律具有相似性,不同条件对模型参数的影响差异较大,试验条件对模型参数的影响规律有待进一步研究。
Based on the finite element theory,a study was made of the influence of loading rate and plate dimensions on pressure-sinkage relationships between soil and loading plates and classical pressure-sinkage model parameters fitting. Different loading rates and plate dimensions can conduct different curves of pressure-sinkage between soil and loading plate. Increasing loading rate can lead to the increase of soil bearing pressure in the same sinking depth,while decreasing the diameters of loading plate can result in the increase of the unit area soil bearing pressure. In addition,with the parameters of classical soil pressure subsidence model fitted with the least square method,it is concluded that the model parameters of different loading rates and plate sizes are non-invariant. The single factor has a similar effect on different parameters,whereas different conditions exert quite different influence on model parameters. The effects of experimental conditions on model parameters need further study.
Based on the finite element theory,a study was made of the influence of loading rate and plate dimensions on pressure-sinkage relationships between soil and loading plates and classical pressure-sinkage model parameters fitting. Different loading rates and plate dimensions can conduct different curves of pressure-sinkage between soil and loading plate. Increasing loading rate can lead to the increase of soil bearing pressure in the same sinking depth,while decreasing the diameters of loading plate can result in the increase of the unit area soil bearing pressure. In addition,with the parameters of classical soil pressure subsidence model fitted with the least square method,it is concluded that the model parameters of different loading rates and plate sizes are non-invariant. The single factor has a similar effect on different parameters,whereas different conditions exert quite different influence on model parameters. The effects of experimental conditions on model parameters need further study.
引文
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[22] YOUSSEF A,ALI G. Determination of soil parameters using platetest[J]. Journal of Terramechanics,1982,19(2):129-147.
[2]蔡巍,王新明,孙家军.江苏如东滩涂土壤承压剪切特性参数测量[J].制造业自动化,2012,34(3):133-135.
[3]雷雪媛.履带车辆履带板的优化设计[D].北京:北京理工大学,2016.
[4] REECE A R. Problems of soil-vechicle mechanics[M].Michigan:US Army Land Locomotion Lab,1964.
[5]张克健.车辆地面力学[M].北京:国防工业出版社,2002:156-157.
[6]吕唯唯.可变形地面与履带板动态耦合特性研究[D].北京:北京理工大学,2013.
[7]姚艳,丁启朔,周俊.重塑土壤承压模型的建立与试验[J].农业机械学报,2010,41(3):40-45.
[8]李杰,庄继德,季学武.车辆行驶的沙漠沙承压特性的研究[J].兵工学报,1999,20(1):62-64.
[9]汪伟,赵家丰,沈晨辉,等.地面力学参数综合测试系统设计与试验[J].农业机械学报,2017,48(5):72-78.
[10]王金昌,陈页开. ABAQUS在土木工程中的应用[M].杭州:浙江大学出版社,2006:16-39.
[11]费康,张建伟. ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2013:281-294.
[12]肖勇杰,陈福全,林良庆.开口管桩高频振动贯入过程的ALE有限元分析[J].工程地质学报,2016,24(3):398-408.
[13]赵家丰,汪伟,孙中兴,等.均质土壤承压下陷模型改进及验证[J].农业工程学报,2016,32(21):60-66.
[14]刘世涛,程培峰.基于ABAQUS土体数值分析的本构模型[J].低温建筑技术,2010,32(2):90-92.
[15]费康,彭劼. ABAQUS岩土工程实例讲解[M].北京:人民邮电出版社,2016:68-85.
[16]徐江,许增会,黄方意.土的本构关系及应用[J].山西建筑,2003,29(12):34-35.
[17]何健,马吉胜,吴大林,等.土壤在垂直和水平载荷下的复合载荷-变形关系[J].农业机械学报,2017,48(9):231-236.
[18]杨聪彬.高速履带与软地面附着特性与优化研究[D].北京:北京理工大学,2015.
[19] LYASKO M. LSA model for sinkage predictions[J]. Journal of Terramechanics,2010,47(1):1-19.
[20] UPADHYAYA S,WULFSOHN D,MEHLSCAU J. An instrumented device to obtain traction related parameters[J]. Journal of Terramechanics,1993,30(1):1-20.
[21] GOTTE LAND P,BENOIT O. Sinkage tests for mobility study,modeling and experimental validation[J]. Journal of Terramechanics,2006,43(4):451-467.
[22] YOUSSEF A,ALI G. Determination of soil parameters using platetest[J]. Journal of Terramechanics,1982,19(2):129-147.