[1]马强,周凤玺.移动荷载下梯度非均匀土的动力响应[J].自然灾害学报,2018,27(06):059-65.[doi:10.13577/j.jnd.2018.0608]
 MA Qiang,ZHOU Fengxi.Dynamic response of graded non-homogeneous soil under a moving load[J].,2018,27(06):059-65.[doi:10.13577/j.jnd.2018.0608]
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移动荷载下梯度非均匀土的动力响应
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
27
期数:
2018年06期
页码:
059-65
栏目:
出版日期:
2018-12-28

文章信息/Info

Title:
Dynamic response of graded non-homogeneous soil under a moving load
作者:
马强 周凤玺
兰州理工大学 土木工程学院, 甘肃 兰州 730050
Author(s):
MA Qiang ZHOU Fengxi
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
关键词:
动力响应梯度非均匀移动荷载回传射线矩阵法弹性地基
Keywords:
dynamic responsegraded non-homogeneousmoving loadreverberation ray matrix methodelastic foundation
分类号:
X43;X9;TU43;P315.93
DOI:
10.13577/j.jnd.2018.0608
摘要:
结合坐标变换,建立了梯度非均匀土地基在移动荷载作用下的动力控制方程,利用回传射线矩阵法推导出了频域内弹性地基的位移和应力的表达式。假设梯度非均匀土的物理力学性质沿深度方向按幂函数连续变化,采用数值Fourier逆变换获得了时域上位移和应力等物理量的数值解。通过数值算例,分析了土体非均匀性以及荷载移动速度对梯度非均匀土动力特性的影响。结果表明,梯度非均匀土的动力特性与均质土有着明显的不同,非均匀性对土体的动力响应有显著影响。在移动荷载作用下,均质土体竖向位移随着速度的增大而增大,而对梯度非均匀土的影响较小。
Abstract:
Combined with the coordinate transformation, the dynamic governing equation for graded non-homogeneous soil foundation under a moving load is established. Applying the reverberation ray matrix method, the expression of displacement and stress in the frequency domain is derived. Assuming that the material properties of graded soil have an exponential law distribution along the thickness-coordinate, by using numerical inverse Fourier transformation, the displacement and the stress is obtained. Via numerical examples, the influence of inhomogeneity and load moving velocity on dynamic response of graded non-homogeneous soil is analyzed. The results show that the dynamic responses of inhomogeneous soil are significantly different from that of homogeneous soil. Under a moving load, the vertical displacement of homogeneous soil increases with the increase of the load moving velocity, but have a little influence on the vertical displacement of graded non-homogeneous soil.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018-09-17;改回日期:2018-10-15。
基金项目:国家自然科学基金项目(51368038);甘肃省陇原青年创新创业人才资助项目
作者简介:马强(1990-),男,博士,主要从事土动力学与岩土工程抗震方面的研究.E-mail:maqiang0104@163.com
通讯作者:周凤玺(1979-),男,教授,博士,主要从事岩土力学,复合材料结构力学方面的研究.E-mail:geolut@163.com
更新日期/Last Update: 1900-01-01