Calculation and Control Methods for Equivalent Resilient Modulus of Subgrade Based on Nonuniform Distribution of Stress
Calculation and Control Methods for Equivalent Resilient Modulus of Subgrade Based on Nonuniform Distribution of Stress
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基于应力非均匀分布的路基等效回弹模量计算与控制方法
DOI：
10.1155/2019/6809510
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发表时间：
2019-09
影响因子：
1.8
通讯作者：
Junhui Peng
中科院分区：
文献类型：
--
作者：
Yongsheng Yao;Junfeng Qian;Jue Li;Anshun Zhang;Junhui Peng
路基回弹模量是路面结构的设计参数，受上覆荷载和交通荷载的影响较大。路基顶面等效回弹模量的计算是基于回弹模量在路基中的非均匀分布而进行的。本文以全风化花岗岩土为研究对象。首先根据路基各层的压实度计算路基结构各层的土体密度。其次，根据路基质量确定路基各点的上覆荷载。第三，基于弹性本构模型，编制并二次开发了有限元软件子程序，提出了在建立收敛准则时，交通荷载作用下路基各点回弹模量的计算方法。最后，根据弹性双层和弹性半空间的挠度等效性，提出了非均匀应力分布下路基顶面等效回弹模量的计算和控制方法，并进行了现场验证试验。结果表明，路基等效回弹模量的数值计算值与实测值的误差范围为10%。结果表明，本文提出的路基等效回弹模量计算方法是合理有效的。路基等效回弹模量随交通荷载的增大而减小。路基土的回弹模量随路基深度的增加而增大。路基土的回弹模量对上覆碎石层后路基的等效回弹模量有显著影响。含碎石层路基的等效回弹模量随路基土回弹模量的增大而增大。
The resilient modulus of subgrade is a design parameter of the pavement structure, which is significantly affected by the overlying load and traffic load. It is important to calculate the equivalent resilient modulus of the top surface of subgrade based on the nonuniform distribution of resilient modulus in subgrade. This paper takes the fully weathered granite soil as the research object. Firstly, the soil density of different layers of the subgrade structure is calculated by the degree of compaction of different subgrade layers. Secondly, the overlying load of each point in the subgrade is determined based on the quality of subgrade. Thirdly, the subprogram of the finite element software is compiled and redeveloped based on the elastic constitutive model, and the calculation method for the resilient modulus of each point in the subgrade under the traffic load is proposed when the convergence criterion is set up. Finally, according to the deflection equivalence of the elastic double layer and elastic half-space, the calculation and control methods for equivalent resilient modulus of the top surface of subgrade under nonuniform stress distribution are put forward, and the field verification tests are carried out. The results show that the error range between numerical calculation and field measurement of equivalent resilient modulus of subgrade is 10%. It shows that the calculation method for equivalent resilient modulus of subgrade proposed in this study is reasonable and effective. The equivalent resilient modulus of subgrade decreases with the increase of traffic load. And the resilient modulus of subgrade soil increases with the increase of subgrade depth. The resilient modulus of subgrade soil has a significant impact on the equivalent resilient modulus of subgrade after the overlaying gravel layer. The equivalent resilient modulus of the subgrade with the gravel layer increases with the increase of the resilient modulus of the subgrade soil.
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影响因子：
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DOI：
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发表时间：
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影响因子：
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