【摘要】 在路基压实过程中,土体的力学参数是实时变化的,但在目前的研究中,假设这些参数保持不变。为了解决这一矛盾,本文建立了压实度K和应变ε之间的关系,并通过室内实验得到压实度K与土体的抗剪强度(黏聚力c和摩擦角φ)之间的关系。为了实现路基压实质量的精确计算,对ABAQUS有限元数值软件进行了二次开发。将数值仿真的结果与模型假定的压实值进行对比分析,验证了路基土智能压实计算结果的准确性。在此基础上,对影响压实度的因素进行了正交试验和敏感度分析。最后,针对精度较差的压实质量评价指标,提出了更为精确的压实质量评价指标。研究结果可为进一步研究路基路面压实质量的准确控制提供指导和依据。更多还原

【Abstract】 During the compaction of a road subgrade, the mechanical parameters of the soil mass change in real time, but current research assumes that these parameters remain unchanged. In order to address this discrepancy, this paper establishes a relationship between the degree of compaction K and strain ε. The relationship between the compaction degree K and the shear strength of soil(cohesion c and frictional angle φ) was clearly established through indoor experiments. The subroutine UMAT in ABAQUS finite element numerical software was developed to realize an accurate calculation of the subgrade soil compaction quality. This value was compared and analyzed against the assumed compaction value of the model, thereby verifying the accuracy of the intelligent compaction calculation results for subgrade soil. On this basis, orthogonal tests of the influential factors(frequency, amplitude, and quality) for the degree of compaction and sensitivity analysis were carried out. Finally, the ‘acceleration intelligent compaction value’, which is based on the acceleration signal, is proposed for a compaction meter value that indicates poor accuracy. The research results can provide guidance and basis for further research into the accurate control of compaction quality for roadbeds and pavements.更多还原