基于机-土耦合模型的铁路路基连续压实质量控制方法

Quality Control Method for Continuous Compaction of Railway Subgrade Based on Roller-Soil Coupling Model

连续压实技术可有效保障路基压实质量,但由于连续压实检测方法和常规检测方法的检测范围相差较大,导致现场试验结果离散性较大,限制了连续压实技术的进一步推广。为建立连续压实检测结果与路基物理力学性质的关系,建立了考虑压路机行驶的机-土耦合模型,并提出了模型参数确定方法。分析了土体剪切模量对振动轮加速度时频域特性、机-土相互作用力以及连续压实质量控制指标的影响,并与路基碾压足尺模型试验结果进行对比。结果表明,模型能够准确反映机-土系统的动力特性。基于机-土耦合模型,提出了一种铁路路基连续压实质量控制方法,实现了根据铁路路基设计参数直接确定连续压实质量控制指标的合格值,为铁路路基连续压实质量控制提供了理论依据和新的实现方法。

The continuous compaction technology can ensure the compaction quality of the subgrade.However,the large difference between the detection range of continuous compaction detection method and conventional detection method causes discrete on-site test results,limiting the further promotion of continuous compaction technology.To establish the theoretical relationship between the continuous compaction detection results and the physical-mechanical properties of the subgrade,a roller-soil coupling model considering the roller driving was established,and the determination method of the model parameters was proposed.An analysis was conducted on the influence of soil shear modulus on the time-frequency domain characteristics of roller acceleration,the roller-soil interaction,as well as the quality control indicators of continuous compaction.The simulation results were compared with those of the subgrade rolling full-scale model test.The results show that the model can accurately reflect the dynamic properties of the roller-soil system.Based on the roller-soil coupling model,a continuous compaction quality control method for railway subgrade was proposed,which directly determines the qualified values of continuous compaction quality control indicators according to the design parameters of railway subgrade.This provides a theoretical basis and new implementation method for the continuous compaction quality control of railway subgrade.