Response characteristics of dynamic stress of subgrade soil under vehicle loads
Response characteristics of dynamic stress of subgrade soil under vehicle loads
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发表时间：
2011
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通讯作者：
Li Hai-yang
中科院分区：
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作者：
Li Hai-yang
为了分析路基土体的动力响应特性，基于层状粘弹性体系理论和用复柔度描述动应力应变特性的动力方程和本构方程，采用传递矩阵法建立了路基土体在车辆荷载作用下的力学行为分析模型，并用实测数据进行了验证。根据该模型和静力学理论，研究了路基土体动静应力随深度的分布规律。车辆荷载、荷载频率、加载次数、土层厚度、荷载作用时间等因素对路基土体的动力响应特性影响较大。讨论了土体复柔度和土体密度对路基土体垂直动应力的取值和分布规律的影响，得出了一些有意义的结论。
In order to analyze the dynamic response characteristics of subgrade soil,based on the theory of the layered visco-elasticity system and the dynamic equation and constitutive equation which employs complex compliance to represent the dynamic stress-strain features,an analytic model for the mechanical behaviors of the subgrade soil subjected to vehicle loads is established by means of the transfer matrix method.The model is validated by the observed data.According to the proposed model and the theory of static mechanics,the distribution rules of dynamic and static stresses with depth are investigated.The influences of vehicle loads,load frequency,loading times,soil depth,soil complex compliance and soil density the values and distribution rules of the vertical dynamic stress in subgrade soil are discussed.Some meaningful conclusions are drawn.