| 基于非局部Biot理论的循环荷载下饱和土地基动力特性研究 |
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| 引用本文： | 丁海滨,管凌霄,童立红,徐长节,颜建伟. 基于非局部Biot理论的循环荷载下饱和土地基动力特性研究[J]. 工程力学, 2023, 40(3): 141-152. DOI: 10.6052/j.issn.1000-4750.2021.09.0712 |
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| 作者姓名： | 丁海滨 管凌霄 童立红 徐长节 颜建伟 |
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| 作者单位： | 1.华东交通大学轨道交通基础设施性能监测与保障国家重点实验室，江西，南昌 330013 |
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| 基金项目： | 国家自然科学基金–高铁联合基金项目(U1934208)；国家自然科学基金项目(52168049)；江西省自然科学基金项目(20202BAB204025)；国家杰出青年科学基金项目(51725802)；江西省自然科学基金重点项目(20192ACB20001) |
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| 摘 要： | 为探究循环动荷载下，孔隙尺寸对饱和土地基动力特性的影响，利用虚位移原理及Newmark积分法对非局部Biot模型进行了空间及时间离散，并采用有限单元法编制了循环荷载下饱和土地基动力响应的计算程序。将该程序计算得到的饱和土一维固结结果和二维单相弹性地基的动力响应结果与已有文献对比，验证了该程序的正确性。研究了循环荷载下孔隙尺寸效应对一维饱和地基，二维饱和地基及饱和路基动力特性的影响。结果表明：荷载频率较高时，随着非局部参数的增加，饱和土地基的动力响应明显滞后，孔隙尺寸效应对饱和土地基动力响应的影响明显，即荷载频率较高时，孔隙尺寸效应不可忽略。
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| 关 键 词： | 非局部Biot理论 孔隙尺寸效应 有限单元法 饱和土地基 动力特性 |
| 收稿时间： | 2021-09-13 |
ON INVESTIGATING THE DYNAMIC CHARACTERISTICS OF SATURATED SOIL FOUNDATION SUBJECTED TO CYCLIC LOAD BASED ON NONLOCAL BIOT THEORY |
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| Affiliation: | 1.State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang, Jiangxi 330013, China2.Engineering Research & Development Centre for Underground Technology of Jiangxi Province, Nanchang, Jiangxi 330013, China3.Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, East China Jiaotong University, Nanchang, Jiangxi 330013, China |
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| Abstract: | To investigate the influence of pore-size effect on the dynamic responses of saturated soil foundation subjected to cyclic loading, the governing equation of nonlocal Biot theory is discretized in time- and space-domains utilizing virtual displacement principle and Newmark integrate method. The dynamic responses of saturated soil foundation subjected to cyclic loads are programed using the finite element method. The results of one-dimensional consolidation of saturated soil and dynamic responses of two-dimensional single-elastic foundation obtained by this program are compared with the published work, verifying this program. The influences of pore-size effect on the dynamic characteristics of one-dimensional saturated foundation, of two-dimensional saturated foundation and, of saturated subgrade subjected to cyclic load are investigated. The results show that: the dynamic responses of saturated soil foundation present significant hysteresis with increasing nonlocal parameter within high-frequency region, and the pore-size effect has increasing influence on the dynamic responses of saturated soil foundation with increasing frequency, which implies that the pore-size effect cannot be ignored in high frequency regions. |
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